tag:blogger.com,1999:blog-83308736873557315872024-03-13T17:51:35.355+03:00Cisco IOS and IOS XR Configuration ExamplesIn this blog we will provide Cisco IOS and IOS XR configuration and troubleshooting examples.Unknownnoreply@blogger.comBlogger73125tag:blogger.com,1999:blog-8330873687355731587.post-19867666064228355502013-12-03T17:37:00.001+02:002013-12-03T17:37:27.865+02:00Cisco Q-in-Q Configuration Example<div dir="ltr" style="text-align: left;" trbidi="on">
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<o:p><span style="font-family: Calibri;"> </span></o:p><b style="mso-bidi-font-weight: normal;"><o:p><span style="font-family: Calibri;"> </span></o:p></b></div>
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<b style="mso-bidi-font-weight: normal;"><u><span style="font-size: 14pt; line-height: 115%;"><span style="font-family: Calibri;">Cisco Q-in-Q Configuration Example:<o:p></o:p></span></span></u></b></div>
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<span style="font-family: Calibri;"><i style="mso-bidi-font-style: normal;">Cisco switches(not all
of them) </i><i style="mso-bidi-font-style: normal;"><span style="color: black; mso-bidi-font-family: Arial;">supports IEEE 802.1Q tunneling(Q-in-Q) and Layer 2 protocol
tunneling features to carry customer’s multiple vlans across the service
provider’s L2 backbone.<o:p></o:p></span></i></span></div>
<br />
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<i style="mso-bidi-font-style: normal;"><span style="color: black; mso-bidi-font-family: Arial;"><span style="font-family: Calibri;">In this example, we will do <u>Q-in-Q
</u>configuration.<o:p></o:p></span></span></i></div>
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<i style="mso-bidi-font-style: normal;"><span style="color: black; mso-bidi-font-family: Arial;"><span style="font-family: Calibri;">Here is the topology for this
example:<o:p></o:p></span></span></i></div>
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<o:p><span style="font-family: Calibri;"> </span></o:p></div>
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<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5yUZNkebo9M3lx6amPv9LHD7yzrtzjul2ZSgCCCKoMPrGurBAW9d4LLBIFPHNtTaCT7b_SG2O95gcYEH7nopSNUpwY-pi8xjN_foYPNoxnB8gM-1yRJ2p8iLvGHH1uHFQVPQIZ1vWtmPP/s1600/Q-in-Q+example1.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="113" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5yUZNkebo9M3lx6amPv9LHD7yzrtzjul2ZSgCCCKoMPrGurBAW9d4LLBIFPHNtTaCT7b_SG2O95gcYEH7nopSNUpwY-pi8xjN_foYPNoxnB8gM-1yRJ2p8iLvGHH1uHFQVPQIZ1vWtmPP/s640/Q-in-Q+example1.png" width="640" /></a></div>
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<b style="mso-bidi-font-weight: normal;"><u><span style="font-size: 14pt; line-height: 115%; mso-fareast-language: TR; mso-no-proof: yes;"><!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600"
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stroked="f">
<v:stroke joinstyle="miter"/>
<v:formulas>
<v:f eqn="if lineDrawn pixelLineWidth 0"/>
<v:f eqn="sum @0 1 0"/>
<v:f eqn="sum 0 0 @1"/>
<v:f eqn="prod @2 1 2"/>
<v:f eqn="prod @3 21600 pixelWidth"/>
<v:f eqn="prod @3 21600 pixelHeight"/>
<v:f eqn="sum @0 0 1"/>
<v:f eqn="prod @6 1 2"/>
<v:f eqn="prod @7 21600 pixelWidth"/>
<v:f eqn="sum @8 21600 0"/>
<v:f eqn="prod @7 21600 pixelHeight"/>
<v:f eqn="sum @10 21600 0"/>
</v:formulas>
<v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"/>
<o:lock v:ext="edit" aspectratio="t"/>
</v:shapetype><v:shape id="Picture_x0020_1" o:spid="_x0000_i1025" type="#_x0000_t75"
style='width:453.75pt;height:81.75pt;visibility:visible;mso-wrap-style:square'>
<v:imagedata src="file:///C:\Users\edizk\AppData\Local\Temp\msohtmlclip1\01\clip_image001.png"
o:title=""/>
</v:shape><![endif]--><!--[if !vml]--><!--[endif]--></span></u></b><b style="mso-bidi-font-weight: normal;"><u><span style="font-size: 14pt; line-height: 115%;"><o:p></o:p></span></u></b><br /></div>
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<o:p><span style="font-family: Calibri;"> </span></o:p></div>
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: Calibri;">Q-in-Q configuration
on PE Switch-1:<o:p></o:p></span></b></div>
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<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">interface GigabitEthernet0/2<o:p></o:p></span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>port-type nni<o:p></o:p></span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>switchport access
vlan 100<o:p></o:p></span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>switchport mode
dot1q-tunnel<o:p></o:p></span></div>
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: Calibri;">Q-in-Q configuration
on PE Switch-2:<o:p></o:p></span></b></div>
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<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">interface GigabitEthernet0/2<o:p></o:p></span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>port-type nni<o:p></o:p></span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>switchport access
vlan 100<o:p></o:p></span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>switchport mode
dot1q-tunnel<o:p></o:p></span></div>
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: Calibri;">Uplink Port Configuration
of CE Switch-1<o:p></o:p></span></b></div>
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<span style="font-family: Calibri;">interface FastEthernet3<o:p></o:p></span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>switchport mode trunk<o:p></o:p></span></div>
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<span style="font-family: Calibri;">interface Vlan10<o:p></o:p></span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>ip address 10.10.10.1
255.255.255.0<o:p></o:p></span></div>
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<span style="font-family: Calibri;">interface Vlan20<o:p></o:p></span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>ip address 20.20.20.1
255.255.255.0<o:p></o:p></span></div>
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: Calibri;">Uplink Port Configuration
of CE Switch-2<o:p></o:p></span></b></div>
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<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">interface FastEthernet3<o:p></o:p></span></div>
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<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>switchport mode trunk<o:p></o:p></span></div>
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<span style="font-family: Calibri;">interface Vlan10<o:p></o:p></span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>ip address 10.10.10.2
255.255.255.0<o:p></o:p></span></div>
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<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">interface Vlan20<o:p></o:p></span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>ip address 20.20.20.2
255.255.255.0<o:p></o:p></span></div>
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<o:p><span style="font-family: Calibri;"> </span></o:p></div>
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: Calibri;">Lets test the
L2TP(Layer2 Tunneling Protocol) configuration:<o:p></o:p></span></b></div>
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<span style="font-family: Calibri;">CE –Switch-1#ping 10.10.10.2 <span style="mso-spacerun: yes;"> </span><o:p></o:p></span></div>
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<span style="font-family: Calibri;">Type escape sequence to abort.<o:p></o:p></span></div>
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<span style="font-family: Calibri;">Sending 5, 100-byte ICMP Echos to 10.10.10.2, timeout is 2
seconds:<o:p></o:p></span></div>
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<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">!!!!!<o:p></o:p></span></div>
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<span style="font-family: Calibri;">Success rate is 100 percent (5/5), round-trip min/avg/max =
1/1/4 ms<o:p></o:p></span></div>
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<i style="mso-bidi-font-style: normal;"><span style="font-family: Calibri;">We see that connection
works.<o:p></o:p></span></i></div>
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<i style="mso-bidi-font-style: normal;"><span style="font-family: Calibri;">Lets increase the size
of the packet:<o:p></o:p></span></i></div>
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<span style="font-family: Calibri;">CE –Switch-1#ping 10.10.10.2 size 1496 df-bit <o:p></o:p></span></div>
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<span style="font-family: Calibri;">Type escape sequence to abort.<o:p></o:p></span></div>
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<span style="font-family: Calibri;">Sending 5, 1496-byte ICMP Echos to 10.10.10.2, timeout is 2
seconds:<o:p></o:p></span></div>
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<span style="font-family: Calibri;">Packet sent with the DF bit set<o:p></o:p></span></div>
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<span style="font-family: Calibri;">!!!!!<o:p></o:p></span></div>
<br />
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<span style="font-family: Calibri;">Success rate is 100 percent (5/5), round-trip min/avg/max =
1/2/4 ms<o:p></o:p></span></div>
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<span style="font-family: Calibri;">It’s ok again..<o:p></o:p></span></div>
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<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Lets increase the size 1-byte more..<o:p></o:p></span></div>
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<span style="font-family: Calibri;">CE –Switch-1#ping 10.10.10.2 size 1497 df-bit <o:p></o:p></span></div>
<br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Type escape sequence to abort.<o:p></o:p></span></div>
<br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Sending 5, 1497-byte ICMP Echos to 10.10.10.2, timeout is 2
seconds:<o:p></o:p></span></div>
<br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Packet sent with the DF bit set<o:p></o:p></span></div>
<br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">.....<o:p></o:p></span></div>
<br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Success rate is 0 percent (0/5)<o:p></o:p></span></div>
<br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="font-family: Calibri;">It doesn’t
work.Because <span style="mso-spacerun: yes;"> </span>PE switch adds a new 802.1q
header.The size of this heades is 4-byte.So, the MTU must be increased at all switches of the Service Provider.New value must be 1504 or more.</span></i><o:p><span style="font-family: Calibri;"> </span></o:p></div>
</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-87353532326934179432013-11-13T17:23:00.004+02:002013-11-13T17:23:47.274+02:00Bgp route filtering with Route-map<div dir="ltr" style="text-align: left;" trbidi="on">
<br /><u><strong><span style="font-size: large;">Bgp route filtering with Route-map</span></strong></u><br />
<em></em><br />
<em><span style="color: blue;">In this example we are only announcing default route and filtering specific routes.</span></em><br />
<em><span style="color: blue;"></span></em><br />
<em><span style="color: blue;">Here is the configuration:</span></em><br />
<br />
router bgp 65500<br /> no synchronization<br /> bgp log-neighbor-changes<br /> network 0.0.0.0<br /> network 192.168.1.0 mask 255.255.255.0<br /> neighbor 10.10.10.2 remote-as 65500<br /> neighbor 10.10.10.2 route-map spoke-out out<br />
<br />ip prefix-list defaultroute seq 5 permit 0.0.0.0/0<br />
<br />
route-map spoke-out permit 10<br /> match ip address prefix-list defaultroute<br /> set metric 0<br /> set ip next-hop 10.10.10.1<br />
<br />
<em><span style="color: blue;">We see that, we have 192.168.1.0/24 network in our bgp table.</span></em><br />
<em></em><br />
R1#show ip bgp<br />BGP table version is 4, local router ID is 10.10.10.1<br />Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,<br /> r RIB-failure, S Stale<br />Origin codes: i - IGP, e - EGP, ? - incomplete<br />
Network Next Hop Metric LocPrf Weight Path<br />*> 0.0.0.0 10.10.10.254 0 32768 i<br />*> 192.168.1.0 0.0.0.0 0 32768 i<br />
<br />
<em><span style="color: blue;">But we are not advertising it to the remote neighbor:</span></em><br />
<br />
R1#show ip bgp neighbors 10.10.10.2 advertised-routes <br />BGP table version is 4, local router ID is 10.10.10.1<br />Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,<br /> r RIB-failure, S Stale<br />Origin codes: i - IGP, e - EGP, ? - incomplete<br />
Network Next Hop Metric LocPrf Weight Path<br />*> 0.0.0.0 10.10.10.254 0 32768 i<br />
Total number of prefixes 1 <br />
<br />
<em><span style="color: blue;">Lets also check the remote router:</span></em><br />
<br />
R4#show ip bgp neighbors 10.10.10.1 routes <br />BGP table version is 3, local router ID is 10.10.10.2<br />Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,<br /> r RIB-failure, S Stale<br />Origin codes: i - IGP, e - EGP, ? - incomplete<br />
Network Next Hop Metric LocPrf Weight Path<br /><strong>*>i0.0.0.0 10.10.10.1 0 100 0 i</strong><br />
Total number of prefixes 1 </div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-10189658257381498422013-10-09T08:24:00.002+03:002013-10-09T08:24:27.724+03:00Cisco Remote Switched Port Analyzer(RSPAN)<div dir="ltr" style="text-align: left;" trbidi="on">
<br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<u><span style="color: black; mso-bidi-font-family: Arial;"><span style="font-family: Calibri;">Cisco
Remote Switched Port Analyzer(RSPAN)</span></span></u><span style="color: black; mso-bidi-font-family: Arial;"><o:p><span style="font-family: Calibri;"> </span></o:p></span></div>
<br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; mso-bidi-font-family: Arial;"><span style="font-family: Calibri;">The
captured traffic from the sources is copied into the RSPAN vlan.Then it is
forwarded over trunk ports that are allowed to carry the RSPAN vlan.The switch
which attached to the network analyzer device, got the RSPAN traffic and
delivers it to the network analyzer.<o:p></o:p></span></span></div>
<br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; mso-bidi-font-family: Arial;"><span style="font-family: Calibri;">Configuration
example on source switches:<o:p></o:p></span></span></div>
<br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="color: blue;"><em>monitor session 1 source vlan 100 - 120<o:p></o:p></em></span></span></div>
<span style="color: blue;"><em>
</em></span><br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="color: blue;"><em>monitor session 1 destination remote vlan 200<o:p></o:p></em></span></span></div>
<br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Configuration example on destionation switch:<o:p></o:p></span></div>
<br />
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 5pt; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt;">
<span style="color: black; mso-bidi-font-family: "Courier New"; mso-bidi-font-weight: bold; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="color: blue;"><em>monitor session
1 source remote vlan 200<o:p></o:p></em></span></span></span></div>
<span style="color: blue;"><em>
</em></span><br />
<pre><span style="color: black; font-family: "Calibri","sans-serif"; font-size: 11pt; mso-ascii-theme-font: minor-latin; mso-bidi-font-weight: bold; mso-hansi-theme-font: minor-latin;"><span style="color: blue;"><em>monitor session 1 destination interface Gigabitethernet0/5</em></span></span><b><span style="color: black; font-size: 12pt;"><o:p></o:p></span></b></pre>
</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-40546385914275191112013-10-05T11:10:00.003+03:002013-10-09T08:24:47.597+03:00Cisco Switched Port Analyzer (SPAN) <div dir="ltr" style="text-align: left;" trbidi="on">
<br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Arial, Helvetica, sans-serif;"><u><span style="color: black; font-family: "Arial","sans-serif"; line-height: 115%;">The Switched Port Analyzer (SPAN)</span></u><span style="color: black; font-family: "Arial","sans-serif"; line-height: 115%;"> , which is also called port mirroring, sends the network traffic to
a network analyzer(sniffer).</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Arial, Helvetica, sans-serif;"><span style="color: black; font-family: "Arial","sans-serif"; line-height: 115%;">In this example there is a sniffer on port
Gigabitethernet5/1.We want to capture all network on port </span>GigabitEthernet5/2
and send the copy of this traffic to port GigabitEthernet5/1:</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Arial, Helvetica, sans-serif;"></span> </div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<em><span style="color: blue; font-family: Arial, Helvetica, sans-serif;">monitor session 1 source interface GigabitEthernet5/2</span></em></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<em><span style="color: blue; font-family: Arial, Helvetica, sans-serif;">monitor session 1 destination interface GigabitEthernet5/1</span></em></div>
<span style="font-family: Arial, Helvetica, sans-serif;">
</span><br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Arial, Helvetica, sans-serif;"><span style="color: black; font-family: "Arial","sans-serif"; line-height: 115%;">In this example there is a sniffer on port
Gigabitethernet3/1.We want to capture all network on vlan 100</span> and send
the copy of this traffic to port GigabitEthernet3/1:</span></div>
<span style="font-family: Arial, Helvetica, sans-serif;">
</span><br />
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<em><span style="color: blue; font-family: Arial, Helvetica, sans-serif;">monitor session 1 source vlan 100</span></em></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<em><span style="font-family: Arial, Helvetica, sans-serif;"><span style="color: blue;">monitor session 1 destination interface GigabitEthernet3/1<o:p></o:p></span></span></em></div>
</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-11405771849833199262012-12-06T16:08:00.003+02:002012-12-06T16:08:49.328+02:00Cisco BGP Dynamic Neighbor<div dir="ltr" style="text-align: left;" trbidi="on">
<br />
<u>Cisco BGP Dynamic Neighbor</u><br />
<br />
After an IPv4 subnet range is configured for a iBGP peer group and a TCP session is initiated<br />by another router which has an IP address in the IPv4 subnet range, a new BGP neighbor will be dynamically established as a member of that group. <br />
<br />
Here is the example:<br />
<br />router bgp 1<br /> bgp listen range 10.1.1.0/24 peer-group SPOKES<br /> bgp listen limit 1000<br /> neighbor SPOKES peer-group<br /> neighbor SPOKES remote-as 1<br /> neighbor SPOKES transport connection-mode passive<br /> neighbor SPOKES route-reflector-client<br /><br />
<br /><br />HUB#show ip bgp sum<br />
<br />Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd<br />
*10.1.1.3 4 1 70069 70100 160 0 0 5w0d 3<br />*10.1.1.4 4 1 80416 80459 160 0 0 5w1d 3<br />* Dynamically created based on a listen range command<br />Dynamically created neighbors: 2 Subnet ranges: 1<br />
BGP peergroup DMVPN listen range group members: <br /> 10.1.1.0/24 <br />
Total dynamically created neighbors: 2/(1000 max), Subnet ranges: 1</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-44522239384342495922012-09-16T16:37:00.001+03:002012-09-16T16:46:23.932+03:00BGP Authentication<div dir="ltr" style="text-align: left;" trbidi="on">
<b>BGP authentication configuration example</b><br />
<br />
BGP authentication is provided through TCP Option 19, the MD5 hash. <br />
<br />
We will use Cisco IOS routers in this example.Here is the basic BGP authentication configurations:<br />
<br />
on R1:<br />
<br />
router bgp 100<br />
neighbor 10.10.10.2 remote-as 200<br />
neighbor 10.10.10.2 password PASSWORD1<br />
<br />
on R2:<br />
<br />
router bgp 200<br />
neighbor 10.10.10.1 remote-as 100<br />
neighbor 10.10.10.1 password PASSWORD1<br />
<br />
R2#show ip bgp neighbors 10.10.10.1 | include BGP state|Flags<br />BGP state = Established, up for 00:01:38<br />Flags: active open, nagle, <b>md5</b><br />
<br />
We will change the BGP password at one of the routers for testing:<br />
<br />
R2(config)#router bgp 200<br />
R2(config-router)#neighbor 10.10.10.1 password PASSWORD2<br />
R2(config-router)#end<br />
R2#clear ip bgp *<br />
%BGP-5-ADJCHANGE: neighbor 10.10.10.1 Down User reset<br />
%TCP-6-BADAUTH: Invalid MD5 digest from 10.10.10.1(179) to 192.10.1.2(19999)<br />
<br />
We understand that the passwords must be matched. </div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-39543008146316042592012-09-06T21:51:00.004+03:002012-09-06T21:51:47.043+03:00BGP Conditional default-route advertisement<div dir="ltr" style="text-align: left;" trbidi="on">
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<br />
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<b style="mso-bidi-font-weight: normal;"><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">BGP Conditional default-route advertisement</span></b></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Conditional
default-route advertisement is done by associating a route-map with the “neighbor
default-originate” statement. The default route is advertised if the route-map
matches the prefix which is in the routing table.If the route is not in the
routing table, the related prefix will not be advertised to the neighbor.</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">We can
match ip prefixes with the route-map using either access-lists or prefix-lists.
</span></div>
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<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Here is
the example:</span></div>
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<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">We will
send default-route when 10.1.10.0/24 network is in the routing table:</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">ip
prefix-list test seq 5 permit 10.1.10.0/24</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">route-map
test permit 10</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>match ip address prefix-list test</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">router bgp 1</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>no synchronization</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>bgp log-neighbor-changes</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>bgp redistribute-internal</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>timers bgp 10 30</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>neighbor 10.10.10.6 remote-as 1</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>neighbor 10.10.10.6 default-originate
route-map test</span></div>
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<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></div>
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<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">R1#sh run int f0/0.10</span></div>
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<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Building configuration...</span></div>
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<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Current configuration : 112 bytes</span></div>
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<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">!</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">interface FastEthernet0/0.10</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>encapsulation dot1Q 10</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>ip address 10.1.10.1 255.255.255.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>end</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">R1#debug ip bgp update (to see
updates)</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">BGP updates debugging is on for
address family: IPv4 Unicast</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">R1#conf t</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Enter configuration commands, one per
line.<span style="mso-spacerun: yes;"> </span>End with CNTL/Z.</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">R1(config)#int f0/0.10</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">R1(config-subif)#shut</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">R1(config-subif)#</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">*Mar<span style="mso-spacerun: yes;">
</span>1 00:28:52.063: BGP(0): 10.10.10.6 send unreachable 0.0.0.0/0</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">*Mar<span style="mso-spacerun: yes;">
</span>1 00:28:52.063: BGP(0): 10.10.10.6 enqueued default-originate update</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">R1(config-subif)#no shut</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">R1(config-subif)#</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">*Mar<span style="mso-spacerun: yes;">
</span>1 00:29:00.031: BGP(0): 10.10.10.6 enqueued default-originate update</span></div>
</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-39408903279733897522012-09-06T21:25:00.003+03:002012-09-06T21:25:57.103+03:00BGP Timers<div dir="ltr" style="text-align: left;" trbidi="on">
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<br />
<h2 class="MsoNormal" style="line-height: normal; margin-bottom: 0.0001pt; text-align: left;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="font-size: large;"><b>BGP Timers</b></span> </span></h2>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">BGP peers send
keepalive message(default interval is 60 seconds) to inform each other of their
availability.</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">They advertise
their hold-time interval(default value is 180 seconds) when establishing BGP session.</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Peers may advertise
different hold-time interval.Lower values are used.</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">We can
change the keepalive and hold-time intervals in BGP configuration mode <span style="mso-spacerun: yes;"> </span>using the command <b>timers bgp
<keepalive> <holdtime></b></span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-font-weight: bold; mso-bidi-theme-font: minor-latin;">Or per neighbor </span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<b><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Neighbor
<ip> timers <keepalive> <holdtime></span></b></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-font-weight: bold; mso-bidi-theme-font: minor-latin;">Here is the example</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<b><span style="font-size: 12.0pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">First
router</span></b></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">router bgp 1</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>no synchronization</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>bgp log-neighbor-changes</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>timers bgp 10 30</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>neighbor 10.10.10.1 remote-as 1</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>neighbor 10.10.10.1 timers 15 45</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">R6#show ip bgp nei 10.10.10.1</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">BGP neighbor is 10.10.10.1,<span style="mso-spacerun: yes;"> </span>remote AS 1, internal link</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;">
</span>BGP version 4, remote router ID 192.168.1.1</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;">
</span>BGP state = Established, up for 00:03:41</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;">
</span><b style="mso-bidi-font-weight: normal;">Last read 00:00:00, last write
00:00:00, hold time is 30, keepalive interval is 10 seconds</b></span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<b style="mso-bidi-font-weight: normal;"><span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>Configured hold time is 45,keepalive interval
is 15 seconds<span style="mso-spacerun: yes;"> </span>Minimum holdtime</span></b></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<b style="mso-bidi-font-weight: normal;"><span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">Second
Router</span></b></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">router bgp 1</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>no synchronization</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>bgp log-neighbor-changes</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>timers bgp 10 30</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>neighbor 10.10.10.6 remote-as 1</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">R1#show ip bgp neighbor</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;">BGP neighbor is 10.10.10.6,<span style="mso-spacerun: yes;"> </span>remote AS 1, internal link</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;">
</span>BGP version 4, remote router ID 192.168.2.6</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;">
</span>BGP state = Established, up for 00:04:36</span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;">
</span><b style="mso-bidi-font-weight: normal;">Last read 00:00:05, last write
00:00:05, hold time is 30, keepalive interval is 10 seconds</b></span></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<b style="mso-bidi-font-weight: normal;"><span style="mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin;"><span style="mso-spacerun: yes;"> </span>Configured hold time is 30,keepalive interval
is 10 seconds, Minimum holdtime</span></b></div>
<div class="MsoNormal" style="line-height: normal; margin-bottom: .0001pt; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;">
<br /></div>
</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-40208847796968707212012-07-12T13:42:00.003+03:002012-09-06T21:52:26.919+03:00BGP Advertise-map<div dir="ltr" style="text-align: left;" trbidi="on">
<b><u>BGP Advertise-map</u></b><br />
<br />
In this example we have two routers:R1 and R2.<br />
<br />
R1 advertises default route with as-path prepending and metric value of 10 if it does not have 3.3.3.3/32 prefix in its BGP table.Here is the configuration:<br />
<br />
interface Loopback0<br />
ip address 10.1.2.1 255.255.255.0 secondary<br />
ip address 10.1.3.1 255.255.255.0 secondary<br />
ip address 10.1.1.1 255.255.255.0<br />
!<br />
interface FastEthernet0/0<br />
ip address 1.1.1.1 255.255.255.0<br />
!<br />
router bgp 1<br />
no synchronization<br />
bgp log-neighbor-changes<br />
network 0.0.0.0<br />
network 3.3.3.3 mask 255.255.255.255<br />
network 10.0.0.0<br />
network 10.1.1.0 mask 255.255.255.0<br />
network 10.1.2.0 mask 255.255.255.0<br />
network 10.1.3.0 mask 255.255.255.0<br />
neighbor 1.1.1.2 remote-as 2<br />
neighbor 1.1.1.2 advertise-map AD non-exist-map NONEXIST<br />
no auto-summary<br />
!<br />
ip forward-protocol nd<br />
ip route 0.0.0.0 0.0.0.0 Null0<br />
ip route 3.3.3.3 255.255.255.255 Null0<br />
! <br />
ip prefix-list default seq 5 permit 0.0.0.0/0<br />
!<br />
ip prefix-list exist seq 5 permit 3.3.3.3/32<br />
!<br />
route-map AD permit 10<br />
match ip address prefix-list default<br />
set metric 10<br />
set as-path prepend 1 1 1<br />
!<br />
route-map NONEXIST permit 10<br />
match ip address prefix-list exist<br />
<br />
<br />
<br />
Verifying:<br />
<br />
With this configuration R2 has not the default route, it has only these routes:<br />
<br />
R2#sh ip bgp<br />
BGP table version is 21, local router ID is 1.1.1.2<br />
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,<br />
r RIB-failure, S Stale<br />
Origin codes: i - IGP, e - EGP, ? - incomplete<br />
<br />
Network Next Hop Metric LocPrf Weight Path<br />
*> 3.3.3.3/32 1.1.1.1 0 0 1 i<br />
*> 10.1.1.0/24 1.1.1.1 0 0 1 i<br />
*> 10.1.2.0/24 1.1.1.1 0 0 1 i<br />
*> 10.1.3.0/24 1.1.1.1 0 0 1 i<br />
<br />
Lets remove the 3.3.3.3/32 route and turn on "debug ip bgp" on R1:<br />
<br />
R1#debug ip bgp <br />
BGP debugging is on for address family: IPv4 Unicast<br />
R1#conf t<br />
Enter configuration commands, one per line. End with CNTL/Z.<br />
R1(config)#no ip route 3.3.3.3 255.255.255.255 null0<br />
R1(config)#<br />
*Mar 1 02:08:38.747: BGP(0): route 3.3.3.3/32 down<br />
*Mar 1 02:08:38.751: BGP(0): no valid path for 3.3.3.3/32<br />
*Mar 1 02:08:38.751: BGP(0): nettable_walker 3.3.3.3/32 no best path<br />
*Mar 1 02:08:38.755: BGP(0): 1.1.1.2 send unreachable 3.3.3.3/32<br />
*Mar 1 02:08:38.755: BGP(0): 1.1.1.2 send UPDATE 3.3.3.3/32 -- unreachable<br />
R1(config)#<br />
*Mar 1 02:08:48.399: BPG(0): Condition exist changes to Advertise<br />
*Mar 1 02:08:48.399: BPG(0): Condition exist changes to Advertise<br />
*Mar 1 02:08:48.403: BGP(0): net 0.0.0.0/0 matches ADV MAP AD bump version to 26<br />
*Mar 1 02:08:48.859: BGP(0): nettable_walker 0.0.0.0/0 route sourced locally<br />
R1(config)#<br />
*Mar 1 02:09:09.227: BGP(0): 1.1.1.2 0.0.0.0/0 matches advertise map AD, state: Advertise<br />
*Mar 1 02:09:09.227: BGP(0): 1.1.1.2 send UPDATE (format) 0.0.0.0/0, next 1.1.1.1, metric 10, path Local<br />
<br />
R2`s BGP table:<br />
<br />
R2#show ip bgp<br />
BGP table version is 23, local router ID is 1.1.1.2<br />
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,<br />
r RIB-failure, S Stale<br />
Origin codes: i - IGP, e - EGP, ? - incomplete<br />
<br />
Network Next Hop Metric LocPrf Weight Path<br />
*> 0.0.0.0 1.1.1.1 10 0 1 1 1 1 i<br />
*> 10.1.1.0/24 1.1.1.1 0 0 1 i<br />
*> 10.1.2.0/24 1.1.1.1 0 0 1 i<br />
*> 10.1.3.0/24 1.1.1.1 0 0 1 i<br />
<br />
<br />
<br /></div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-26621674659156695682012-04-20T13:28:00.002+03:002012-04-20T13:28:34.283+03:00BGP filtering with Prefix-Lists<div dir="ltr" style="text-align: left;" trbidi="on">
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<b style="mso-bidi-font-weight: normal;"><u><span style="font-family: Calibri;">BGP filtering with Prefix-Lists</span></u></b></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="font-family: Calibri;">In this example, we will filter the BGP routes by using prefix-list</span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="font-family: Calibri;">Here is the initial configuration of the router:</span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">interface Loopback4</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>ip address 4.4.4.4 255.255.255.255</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">!</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">interface FastEthernet1/0</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>ip address 192.168.45.4 255.255.255.0</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>!</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">router bgp 4</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>no synchronization</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>bgp log-neighbor-changes</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>network 4.4.4.4 mask 255.255.255.255</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>neighbor 192.168.45.5 remote-as 5</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Here is the BGP table:</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">R4#show ip bgp</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">BGP table version is 4, local router ID is 192.168.0.4</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>r RIB-failure, S Stale</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Origin codes: i - IGP, e - EGP, ? - incomplete</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Network<span style="mso-spacerun: yes;"> </span>Next Hop<span style="mso-spacerun: yes;"> </span>Metric LocPrf Weight Path</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 4.4.4.4/32<span style="mso-spacerun: yes;"> </span>0.0.0.0<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>32768 i</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 5.5.5.5/32<span style="mso-spacerun: yes;"> </span>192.168.45.5<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>0 5 i</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 55.55.55.0/24<span style="mso-spacerun: yes;"> </span>192.168.45.5<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>0 5 i</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Lets filter the 55.55.55.0/24:</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Firstly we will create a prefix-list <span style="mso-spacerun: yes;"> </span>access-list.</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Prefix-list name is R5-in</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">ip prefix-list R5-in seq 5 deny 55.55.55.0/24</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">ip prefix-list R5-in seq 10 permit 0.0.0.0/0 le 32</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Then, we apply the prefix-list to the BGP configuration:</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">R4(config)#router bgp 4<span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span></span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">R4(config-router)#neighbor 192.168.45.5 prefix-list R5-in in</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Then we see that 55.55.55.0/24 IP prefix is no longer exists:</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">R4#show ip bgp</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">BGP table version is 5, local router ID is 192.168.0.4</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>r RIB-failure, S Stale</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Origin codes: i - IGP, e - EGP, ? - incomplete</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Network<span style="mso-spacerun: yes;"> </span>Next Hop<span style="mso-spacerun: yes;"> </span>Metric LocPrf Weight Path</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 4.4.4.4/32<span style="mso-spacerun: yes;"> </span>0.0.0.0<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>32768 i</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 5.5.5.5/32<span style="mso-spacerun: yes;"> </span>192.168.45.5<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>0 5 i</span></span></div>
</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-71256638213914203882012-04-20T13:07:00.000+03:002012-04-20T13:07:33.263+03:00BGP filtering with Extended Access-list<div dir="ltr" style="text-align: left;" trbidi="on">
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<b style="mso-bidi-font-weight: normal;"><u><span style="font-family: Calibri;">BGP filtering with Extended Access-list</span></u></b></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="font-family: Calibri;">In this example, we will filter the BGP routes by using extended access-list.</span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="font-family: Calibri;">Here is the initial configuration of the router:</span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">interface Loopback4</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>ip address 4.4.4.4 255.255.255.255</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">!</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">interface FastEthernet1/0</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>ip address 192.168.45.4 255.255.255.0</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>!</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">router bgp 4</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>no synchronization</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>bgp log-neighbor-changes</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>network 4.4.4.4 mask 255.255.255.255</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>neighbor 192.168.45.5 remote-as 5</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Here is the BGP table:</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">R4#show ip bgp</span></span></div>
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<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">BGP table version is 4, local router ID is 192.168.0.4</span></span></div>
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<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>r RIB-failure, S Stale</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Origin codes: i - IGP, e - EGP, ? - incomplete</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Network<span style="mso-spacerun: yes;"> </span>Next Hop<span style="mso-spacerun: yes;"> </span>Metric LocPrf Weight Path</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 4.4.4.4/32<span style="mso-spacerun: yes;"> </span>0.0.0.0<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>32768 i</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 5.5.5.5/32<span style="mso-spacerun: yes;"> </span>192.168.45.5<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>0 5 i</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 55.55.55.0/24<span style="mso-spacerun: yes;"> </span>192.168.45.5<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>0 5 i</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Lets filter the 55.55.55.0/24:</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Firstly we will create an extended access-list.</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Access-list name is R5-in.</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">We are matching both IP prefix and subnet mask in this extended access-list(Standard access-list matches just the prefix, not subnet mask):</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">ip access-list extended R5-in</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>deny<span style="mso-spacerun: yes;"> </span>ip host 55.55.55.0 host 255.255.255.0</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>permit ip any any</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Then, we apply the named extended access-list to the BGP configuration by using distribute-list command:</span></span></i></div>
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<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">R4(config)#router bgp 4<span style="mso-spacerun: yes;"> </span></span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">R4(config-router)#neighbor 192.168.45.5 distribute-list R5-in in</span></span></div>
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<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Then we see that 55.55.55.0/24 network is no longer exists:</span></span></i></div>
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<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">R4#show ip bgp</span></span></div>
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<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">BGP table version is 5, local router ID is 192.168.0.4</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>r RIB-failure, S Stale</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Origin codes: i - IGP, e - EGP, ? - incomplete</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Network<span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span>Next Hop<span style="mso-spacerun: yes;"> </span>Metric LocPrf Weight Path</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 4.4.4.4/32<span style="mso-spacerun: yes;"> </span>0.0.0.0<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>32768 i</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 5.5.5.5/32<span style="mso-spacerun: yes;"> </span>192.168.45.5<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>0 5 i</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">R4# show access-lists </span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Extended IP access list R5-in</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>10 deny ip host 55.55.55.0 host 255.255.255.0 (2 matches)</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>20 permit ip any any (2 matches)</span></span></div>
</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-55300738506832705472012-04-20T12:51:00.003+03:002012-04-20T13:29:16.427+03:00BGP filtering with Standard Access-list<div dir="ltr" style="text-align: left;" trbidi="on">
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<b style="mso-bidi-font-weight: normal;"><u><span style="font-family: Calibri;">BGP filtering with Standard Access-list</span></u></b></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="font-family: Calibri;">In this example, we will filter the BGP routes by using standard access-list.</span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="font-family: Calibri;">Here is the initial configuration of the router:</span></i></div>
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<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">interface Loopback4</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>ip address 4.4.4.4 255.255.255.255</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">!</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">interface FastEthernet1/0</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>ip address 192.168.45.4 255.255.255.0</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>!</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">router bgp 4</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>no synchronization</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>bgp log-neighbor-changes</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>network 4.4.4.4 mask 255.255.255.255</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>neighbor 192.168.45.5 remote-as 5</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Here is the BGP table:</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">R4#show ip bgp</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">BGP table version is 4, local router ID is 192.168.0.4</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>r RIB-failure, S Stale</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Origin codes: i - IGP, e - EGP, ? - incomplete</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Network<span style="mso-spacerun: yes;"> </span>Next Hop<span style="mso-spacerun: yes;"> </span>Metric LocPrf Weight Path</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 4.4.4.4/32<span style="mso-spacerun: yes;"> </span>0.0.0.0<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>32768 i</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 5.5.5.5/32<span style="mso-spacerun: yes;"> </span>192.168.45.5<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>0 5 i</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 55.55.55.0/24<span style="mso-spacerun: yes;"> </span>192.168.45.5<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>0 5 i</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Lets filter the 55.55.55.0/24:</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Firstly we will create a standard access-list.</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Access-list name is R5-in</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">ip access-list standard R5-in</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>deny<span style="mso-spacerun: yes;"> </span>55.55.55.0 0.0.0.255</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>permit any</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Then, we apply the named access-list to the BGP configuration by using distribute-list command:</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">R4(config)#router bgp 4<span style="mso-spacerun: yes;"> </span></span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">R4(config-router)#neighbor 192.168.45.5 distribute-list R5-in in</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<i style="mso-bidi-font-style: normal;"><span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Then we see that 55.55.55.0/24 network is no longer exists:</span></span></i></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">R4#show ip bgp</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">BGP table version is 5, local router ID is 192.168.0.4</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>r RIB-failure, S Stale</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Origin codes: i - IGP, e - EGP, ? - incomplete</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Network<span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span>Next Hop<span style="mso-spacerun: yes;"> </span>Metric LocPrf Weight Path</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 4.4.4.4/32<span style="mso-spacerun: yes;"> </span>0.0.0.0<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>32768 i</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">*> 5.5.5.5/32<span style="mso-spacerun: yes;"> </span>192.168.45.5<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>0 5 i</span></span></div>
</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-53772931480557138012012-04-20T12:35:00.002+03:002012-04-20T12:35:38.024+03:00Basic EBGP configuration<div dir="ltr" style="text-align: left;" trbidi="on">
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto;">
<b style="mso-bidi-font-weight: normal;"><u><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Basic EBGP configuration between two Cisco IOS routers:</span></span></u></b></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto;">
<span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Here is the basic external BGP configuration between two routers.</span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto;">
<span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">(We announced loopback IP addresses on both routers for testing)</span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto;">
<span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">First router:</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">interface Loopback4</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>ip address 4.4.4.4 255.255.255.255</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">!</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">interface FastEthernet1/0</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>ip address 192.168.45.4 255.255.255.0</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>!</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">router bgp 4</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>no synchronization</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>bgp log-neighbor-changes</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>network 4.4.4.4 mask 255.255.255.255</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>neighbor 192.168.45.5 remote-as 5</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="color: black; font-size: 12pt; line-height: 115%; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Second Router:</span></span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">interface Loopback5</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>ip address 5.5.5.5 255.255.255.255</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">!</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">interface FastEthernet0/0</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>ip address 192.168.45.5 255.255.255.0</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">!</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">router bgp 5</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>no synchronization</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>bgp log-neighbor-changes</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>network 5.5.5.5 mask 255.255.255.255</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>neighbor 192.168.45.4 remote-as 4</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">BGP is up:</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">R4#show ip bgp summary </span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">BGP router identifier 192.168.0.4, local AS number 4</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">BGP table version is 3, main routing table version 3</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">2 network entries using 240 bytes of memory</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">2 path entries using 104 bytes of memory</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">3/2 BGP path/bestpath attribute entries using 372 bytes of memory</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">1 BGP AS-PATH entries using 24 bytes of memory</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">0 BGP route-map cache entries using 0 bytes of memory</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">0 BGP filter-list cache entries using 0 bytes of memory</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Bitfield cache entries: current 1 (at peak 1) using 32 bytes of memory</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">BGP using 772 total bytes of memory</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">BGP activity 2/0 prefixes, 2/0 paths, scan interval 60 secs</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Neighbor<span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span>V<span style="mso-spacerun: yes;"> </span>AS MsgRcvd MsgSent<span style="mso-spacerun: yes;"> </span>TblVer<span style="mso-spacerun: yes;"> </span>InQ OutQ Up/Down<span style="mso-spacerun: yes;"> </span>State/PfxRcd</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">192.168.45.5<span style="mso-spacerun: yes;"> </span>4<span style="mso-spacerun: yes;"> </span>5<span style="mso-spacerun: yes;"> </span>10<span style="mso-spacerun: yes;"> </span>10<span style="mso-spacerun: yes;"> </span>3<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>0 00:06:22<span style="mso-spacerun: yes;"> </span>1</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">BGP table is created:</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">R4#show ip bgp</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">BGP table version is 3, local router ID is 192.168.0.4</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>r RIB-failure, S Stale</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Origin codes: i - IGP, e - EGP, ? - incomplete</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Network<span style="mso-spacerun: yes;"> </span>Next Hop<span style="mso-spacerun: yes;"> </span>Metric LocPrf Weight Path</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">*> 4.4.4.4/32<span style="mso-spacerun: yes;"> </span>0.0.0.0<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>32768 i</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">*> 5.5.5.5/32<span style="mso-spacerun: yes;"> </span>192.168.45.5<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>0 5 i</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Routing table entry for remote route shows the BGP route:</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">R4#show ip route 5.5.5.5</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Routing entry for 5.5.5.5/32</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Known via "bgp 4", distance 20, metric 0</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Tag 5, type external</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Last update from 192.168.45.5 00:07:25 ago</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Routing Descriptor Blocks:</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>* 192.168.45.5, from 192.168.45.5, 00:07:25 ago</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Route metric is 0, traffic share count is 1</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>AS Hops 1</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Route tag 5</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Reachability test:</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">R4#ping 5.5.5.5 source 4.4.4.4</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<br /></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Type escape sequence to abort.</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds:</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Packet sent with a source address of 4.4.4.4 </span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">!!!!!</span></div>
<div class="MsoNormal" style="margin: 0cm 0cm 10pt;">
<span style="font-family: Calibri;">Success rate is 100 percent (5/5), round-trip min/avg/max = 16/36/68 ms</span></div>
</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-14267917199940935362012-04-20T12:20:00.002+03:002012-04-20T12:20:50.332+03:00Cisco IOS BGP Best Path Selection<div dir="ltr" style="text-align: left;" trbidi="on">
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt 44.25pt; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto;">
<b style="mso-bidi-font-weight: normal;"><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Cisco IOS BGP Best Path Selection</span></span></b></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt 44.25pt; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt 44.25pt; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; tab-stops: list 39.3pt; text-indent: -18pt;">
<b style="mso-bidi-font-weight: normal;"><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-language: TR;"><span style="mso-list: Ignore;"><span style="font-family: Calibri;">1.</span><span style="font: 7pt "Times New Roman";"> </span></span></span></b><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Select the path which has the highest <b style="mso-bidi-font-weight: normal;"><u>weight</u></b>.</span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt 44.25pt; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; tab-stops: list 39.3pt; text-indent: -18pt;">
<b style="mso-bidi-font-weight: normal;"><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-language: TR;"><span style="mso-list: Ignore;"><span style="font-family: Calibri;">2.</span><span style="font: 7pt "Times New Roman";"> </span></span></span></b><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Select the path which has the highest <b style="mso-bidi-font-weight: normal;"><u>local-preference</u></b></span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt 44.25pt; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; tab-stops: list 39.3pt; text-indent: -18pt;">
<b style="mso-bidi-font-weight: normal;"><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-language: TR;"><span style="mso-list: Ignore;"><span style="font-family: Calibri;">3.</span><span style="font: 7pt "Times New Roman";"> </span></span></span></b><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Select the path which was locally originated via a <b>network</b> or <b>aggregate</b> command or through redistribution.</span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt 44.25pt; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; tab-stops: list 39.3pt; text-indent: -18pt;">
<b style="mso-bidi-font-weight: normal;"><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-language: TR;"><span style="mso-list: Ignore;"><span style="font-family: Calibri;">4.</span><span style="font: 7pt "Times New Roman";"> </span></span></span></b><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Select the path which has the shortest <b style="mso-bidi-font-weight: normal;"><u>AS_PATH</u></b>.</span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt 44.25pt; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; tab-stops: list 39.3pt; text-indent: -18pt;">
<b style="mso-bidi-font-weight: normal;"><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-language: TR;"><span style="mso-list: Ignore;"><span style="font-family: Calibri;">5.</span><span style="font: 7pt "Times New Roman";"> </span></span></span></b><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Select the path which has the lowest <b style="mso-bidi-font-weight: normal;"><u>origin type</u></b>(igp<egp<incomplete).</span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt 44.25pt; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; tab-stops: list 39.3pt; text-indent: -18pt;">
<b style="mso-bidi-font-weight: normal;"><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-language: TR;"><span style="mso-list: Ignore;"><span style="font-family: Calibri;">6.</span><span style="font: 7pt "Times New Roman";"> </span></span></span></b><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Select the path which has the lowest <b style="mso-bidi-font-weight: normal;"><u>med</u></b>.</span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt 44.25pt; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; tab-stops: list 39.3pt; text-indent: -18pt;">
<b style="mso-bidi-font-weight: normal;"><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-language: TR;"><span style="mso-list: Ignore;"><span style="font-family: Calibri;">7.</span><span style="font: 7pt "Times New Roman";"> </span></span></span></b><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Select the <span style="mso-spacerun: yes;"> </span>eBGP paths rather than iBGP paths.</span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt 44.25pt; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; tab-stops: list 39.3pt; text-indent: -18pt;">
<b style="mso-bidi-font-weight: normal;"><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-language: TR;"><span style="mso-list: Ignore;"><span style="font-family: Calibri;">8.</span><span style="font: 7pt "Times New Roman";"> </span></span></span></b><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Select the path which has the lowest IGP metric to the BGP next hop.</span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt 44.25pt; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; tab-stops: list 39.3pt; text-indent: -18pt;">
<b style="mso-bidi-font-weight: normal;"><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-language: TR;"><span style="mso-list: Ignore;"><span style="font-family: Calibri;">9.</span><span style="font: 7pt "Times New Roman";"> </span></span></span></b><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Select the path which was received first, when all paths are external</span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt 44.25pt; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; tab-stops: list 39.3pt; text-indent: -18pt;">
<b style="mso-bidi-font-weight: normal;"><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-language: TR;"><span style="mso-list: Ignore;"><span style="font-family: Calibri;">10.</span><span style="font: 7pt "Times New Roman";"> </span></span></span></b><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Select the path which comes from a neighbor that has lowest Router-id.</span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt 44.25pt; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; tab-stops: list 39.3pt; text-indent: -18pt;">
<b style="mso-bidi-font-weight: normal;"><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-language: TR;"><span style="mso-list: Ignore;"><span style="font-family: Calibri;">11.</span><span style="font: 7pt "Times New Roman";"> </span></span></span></b><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Select the path which has the minimum cluster list length, when the originator <span style="mso-spacerun: yes;"> </span>is the same for all paths.It is used <span style="mso-spacerun: yes;"> </span>when there is a Route-Reflector in the topology.</span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 10pt 44.25pt; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; tab-stops: list 39.3pt; text-indent: -18pt;">
<b style="mso-bidi-font-weight: normal;"><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-language: TR;"><span style="mso-list: Ignore;"><span style="font-family: Calibri;">12.</span><span style="font: 7pt "Times New Roman";"> </span></span></span></b><span style="color: black; font-size: 12pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: TR;"><span style="font-family: Calibri;">Select the path which comes from the lowest neighbor address.</span></span></div>
</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-59862919189170443442011-12-29T09:42:00.000+02:002011-12-29T09:42:33.294+02:00Time-Based Eigrp Authentication<div dir="ltr" style="text-align: left;" trbidi="on">
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<b style="mso-bidi-font-weight: normal;"><u><span style="color: #333333; font-family: "Arial", "sans-serif";">Time-Based</span></u></b><b style="mso-bidi-font-weight: normal;"><span style="color: #333333; font-family: "Arial", "sans-serif";"> <u>Eigrp Authentication:</u></span></b></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<b style="mso-bidi-font-weight: normal;"><u><span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="text-decoration: none;"></span></span></u></b></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Arial", "sans-serif";">For example, if we add accept-lifetime command in the key chain configuration like this on <span style="color: #333333; font-family: "Arial", "sans-serif";">23:01:19.203 UTC Wed Dec 3 2011:</span></span><div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Arial", "sans-serif";">key chain AUTH</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>key 1</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>key-string 123456</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>accept-lifetime 16:00:00 Oct 14 2011 14:00:00 Dec 2 2011</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>send-lifetime 15:00:00 Oct 15 2011 infinite</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Arial", "sans-serif";">After Dec 2 2011, Eigrp neighborship is closed with an error message of:</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<br /></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">%DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 192.168.12.1 (FastEthernet0/0) is down: Auth failure</span></div>
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<br /></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Because accept-lifetime of key 1 is expired.</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Lets do another time based <b style="mso-bidi-font-weight: normal;"><u>Eigrp Authentication</u></b> configuration example.</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">We set the clock manually on both routers at same time:</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">clock set 22:58:00 Nov 30 2011</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Then we configure these key chain configurations on both routers:</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">key chain AUTH</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>key 1</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>key-string 123456</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>accept-lifetime 16:00:00 Oct 14 2011 14:00:00 Dec 2 2011</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>send-lifetime 15:00:00 Oct 15 2011 23:00:00 Nov 30 2011</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>key 2</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>key-string 123456</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>accept-lifetime 22:00:00 Nov 30 2011 infinite</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>send-lifetime 22:00:00 Nov 30 2011 infinite</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Note: lowest key-id number is always prefered if it is in valid time range.</span></div>
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<br /></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Then we wait for key-id change after 23:00:00.</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Here is the debug eigrp packet outputs:</span></div>
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<span style="color: red; font-family: "Arial", "sans-serif";">Nov 30 22:59:55.459: EIGRP: received packet with MD5 authentication, key id = 1</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 22:59:55.463: EIGRP: Received HELLO on FastEthernet0/0 nbr 192.168.12.2</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 22:59:55.467:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 22:59:57.291: EIGRP: Sending HELLO on FastEthernet0/1</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 22:59:57.295:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 22:59:57.615: EIGRP: Sending HELLO on Loopback0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 22:59:57.619:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 22:59:57.631: EIGRP: Received HELLO on Loopback0 nbr 192.168.0.1</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 22:59:57.635:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 22:59:57.635: EIGRP: Packet from ourselves ignored</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 22:59:57.963: EIGRP: Sending HELLO on FastEthernet0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 22:59:57.967:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 22:59:58.063: EIGRP: Received HELLO on FastEthernet0/1 nbr 192.168.13.3</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 22:59:58.067:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0</span></div>
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<span style="color: red; font-family: "Arial", "sans-serif";">Nov 30 23:00:00.199: EIGRP: received packet with MD5 authentication, key id = 1</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:00.203: EIGRP: Received HELLO on FastEthernet0/0 nbr 192.168.12.2</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:00.207:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:01.763: EIGRP: Sending HELLO on FastEthernet0/1</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:01.767:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:02.231: EIGRP: Sending HELLO on Loopback0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:02.235:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:02.243: EIGRP: Received HELLO on Loopback0 nbr 192.168.0.1</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:02.247:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:02.247: EIGRP: Packet from ourselves ignored</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:02.443: EIGRP: Sending HELLO on FastEthernet0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:02.447:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:02.779: EIGRP: Received HELLO on FastEthernet0/1 nbr 192.168.13.3</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:02.783:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0</span></div>
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<span style="color: red; font-family: "Arial", "sans-serif";">Nov 30 23:00:05.131: EIGRP: received packet with MD5 authentication, key id = 2</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:05.135: EIGRP: Received HELLO on FastEthernet0/0 nbr 192.168.12.2</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:05.139:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:06.307: EIGRP: Sending HELLO on FastEthernet0/1</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:06.311:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:06.491: EIGRP: Sending HELLO on Loopback0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:06.495:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:06.495: EIGRP: Received HELLO on Loopback0 nbr 192.168.0.1</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:06.495:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:06.495: EIGRP: Packet from ourselves ignored</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:07.063: EIGRP: Sending HELLO on FastEthernet0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:07.067:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:07.723: EIGRP: Received HELLO on FastEthernet0/1 nbr 192.168.13.3</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Arial", "sans-serif";">Nov 30 23:00:07.723:<span style="mso-spacerun: yes;"> </span>AS 1, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 peerQ un/rely 0/0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: red; font-family: "Arial", "sans-serif";">Nov 30 23:00:10.091: EIGRP: received packet with MD5 authentication, key id = 2</span></div>
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<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">Key-id changed without clearing the eigrp neighborship.</span></div>
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<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">R2#show key chain</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">Key-chain AUTH:</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>key 1 -- text "123456"</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>accept lifetime (16:00:00 UTC Oct 14 2011) - (14:00:00 UTC Dec 2 2011) [valid now]</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>send lifetime (15:00:00 UTC Oct 15 2011) - (23:00:00 UTC Nov 30 2011)</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>key 2 -- text "123456"</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>accept lifetime (22:00:00 UTC Nov 30 2011) - (infinite) [valid now]</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>send lifetime (22:00:00 UTC Nov 30 2011) - (infinite) [valid now]</span></div>
</div>
</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-21795180334154979722011-12-29T09:37:00.000+02:002011-12-29T09:37:21.298+02:00Eigrp Authentication<div dir="ltr" style="text-align: left;" trbidi="on">
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<b style="mso-bidi-font-weight: normal;"><u><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">Eigrp Authentication</span></u></b><b style="mso-bidi-font-weight: normal;"><u><span style="color: #333333; font-family: "Arial", "sans-serif";"></span></u></b></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">- Eigrp Authentication must be enabled on both routers.</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">- Key-id and key-string must match on both routers.</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">These configurations should be added to both Eigrp neighboring routers for <b style="mso-bidi-font-weight: normal;"><u>Eigrp Authentication</u></b> :</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">key chain AUTH</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>key 10</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>key-string 123456</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">interface FastEthernet0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"> ip authentication mode eigrp 1 md5</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"> ip authentication key-chain eigrp 1 AUTH</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">If we enable <b style="mso-bidi-font-weight: normal;"><u>Eigrp Authentication</u></b> one of them, we can get these type of log messages, when “debug eigrp packet” command is active:</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">* EIGRP: FastEthernet0/0: ignored packet from 192.168.12.2, opcode = 5 (missing authentication)</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">If the key id and key-string does not match, we can get these type of log messages, when “debug eigrp packet” command is active:</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">*EIGRP: FastEthernet0/0: ignored packet from 192.168.12.2, opcode = 5 (invalid authentication)</span></div>
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</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-88352461749000741852011-12-29T09:32:00.000+02:002011-12-29T09:32:55.618+02:00Basic Eigrp Configuration<div dir="ltr" style="text-align: left;" trbidi="on">
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: Calibri;">Basic Eigrp Configuration</span></b></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">After EIGRP process is configured on the router, the router starts to exchange EIGRP hello packets over the multicast address 224.0.0.10.Eigrp neighborships form between routers after they get each other's hello packet.</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Some rules for these neighborships:</span></div>
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<span style="color: #333333; font-family: "Verdana", "sans-serif"; mso-bidi-font-family: Verdana; mso-fareast-font-family: Verdana;"><span style="mso-list: Ignore;">-<span style="font: 7pt "Times New Roman";"> </span></span></span><span style="color: #333333; font-family: "Arial", "sans-serif";">The receiving router compares the source address of the hello packet with the IP address of the interface where the packet was received</span><span style="color: black; font-family: "Arial", "sans-serif";">.These IP addresses must be in same subnet.</span><span style="color: #333333; font-family: "Arial", "sans-serif";"></span></div>
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<span style="color: #333333; font-family: "Verdana", "sans-serif"; mso-bidi-font-family: Verdana; mso-fareast-font-family: Verdana;"><span style="mso-list: Ignore;">-<span style="font: 7pt "Times New Roman";"> </span></span></span><span style="color: #333333; font-family: "Arial", "sans-serif";">The routers compares the K constant values of </span><span style="color: black; font-family: "Arial", "sans-serif";">each other.These K values must match.</span><span style="color: #333333; font-family: "Arial", "sans-serif";"></span></div>
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<span style="color: #333333; font-family: "Verdana", "sans-serif"; mso-bidi-font-family: Verdana; mso-fareast-font-family: Verdana;"><span style="mso-list: Ignore;">-<span style="font: 7pt "Times New Roman";"> </span></span></span><span style="color: black; font-family: "Arial", "sans-serif";">The routers must use the same AS number for Eigrp.</span><span style="color: #333333; font-family: "Arial", "sans-serif";"></span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><u><strong>Basic Eigrp configuration</strong></u> between two<span style="mso-spacerun: yes;"> </span>routers:</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Router1:</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">interface Loopback0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.0.1 255.255.255.255</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">!</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">interface FastEthernet0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.12.1 255.255.255.0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">router eigrp 1</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.0.0 0.0.255.255</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Here is the basic Eigrp configuration for Router2</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">interface Loopback0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.0.2 255.255.255.255</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">!</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">interface FastEthernet0/0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.12.2 255.255.255.0</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">router eigrp 1</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.0.0 0.0.255.255</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Verification:</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">R1#show ip eigrp neighbors </span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">IP-EIGRP neighbors for process 1</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">H<span style="mso-spacerun: yes;"> </span>Address<span style="mso-spacerun: yes;"> </span>Interface<span style="mso-spacerun: yes;"> </span>Hold Uptime<span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span>SRTT<span style="mso-spacerun: yes;"> </span>RTO<span style="mso-spacerun: yes;"> </span>Q<span style="mso-spacerun: yes;"> </span>Seq</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>(sec)<span style="mso-spacerun: yes;"> </span>(ms)<span style="mso-spacerun: yes;"> </span>Cnt Num</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">0<span style="mso-spacerun: yes;"> </span>192.168.12.2<span style="mso-spacerun: yes;"> </span>Fa0/0<span style="mso-spacerun: yes;"> </span>13 00:25:40<span style="mso-spacerun: yes;"> </span>286<span style="mso-spacerun: yes;"> </span>1716<span style="mso-spacerun: yes;"> </span>0<span style="mso-spacerun: yes;"> </span>36</span></div>
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<span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">The explanations of the “show ip eigrp neighbors” command output:</span></div>
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<b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">H</span></b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">— The list of the neighbors.</span></div>
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<b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">Address</span></b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">— The IP address of the neighbors.</span></div>
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<b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">Interface</span></b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">— The interface that the router communicate with the neighbor.</span></div>
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<b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">Hold</span></b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">— The hold timer for the neighbor. If this timer reaches 0, the neighbor relationship becomes down</span></div>
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<b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">Uptime</span></b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">— shows the how long this neighbor has been established.</span></div>
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<b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">SRTT (Smooth Round Trip Time)</span></b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">— The average time interval for EIGRP packet is sent and received.</span></div>
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<b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">RTO (Round Trip Timeout)</span></b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">— How long the router will wait to retransmit the EIGRP reliable packet if acknowledgment is not received.</span></div>
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<b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">Q Count</span></b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">— The number of EIGRP packets waiting to</span></div>
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<span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;"> be sent to the neighbor.</span></div>
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<b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">Sequence Number</span></b><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">— The sequence number of the last EIGRP reliable packets being</span></div>
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<span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">received from the neighbor.</span></div>
</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-12774592062423923772011-12-29T09:29:00.000+02:002011-12-29T09:29:15.337+02:00Eigrp Metric Calculation<div dir="ltr" style="text-align: left;" trbidi="on">
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<span style="font-family: Calibri;"><b style="mso-bidi-font-weight: normal;"><u>EIGRP Metric Calculation</u></b>:</span></div>
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<span style="font-family: Calibri;">Eigrp Metric=256x[(10.000.000/ min bw in kbps along the path)+(total delay in tens of microseconds along the path)]</span></div>
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<br /></div>
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<span style="font-family: Calibri;">Lets do an example for <b style="mso-bidi-font-weight: normal;"><u>Eigrp Metric Calculation</u></b>:</span></div>
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<span style="font-family: Calibri;">For example, We have an EIGRP topology entry like this:</span></div>
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<br /></div>
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<span style="font-family: Calibri;">R1#show ip eigrp topology 192.168.0.2/32</span></div>
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<span style="font-family: Calibri;">IP-EIGRP (AS 1): Topology entry for 192.168.0.2/32</span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>State is Passive, Query origin flag is 1, 1 Successor(s), FD is 409600</span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Routing Descriptor Blocks:</span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>192.168.12.2 (FastEthernet0/0), from 192.168.12.2, Send flag is 0x0</span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Composite metric is (409600/128256), Route is Internal</span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Vector metric:</span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span><span style="color: red;">Minimum bandwidth is 10000 Kbit</span></span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span><span style="color: red;">Total delay is 6000 microseconds</span></span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Reliability is 255/255</span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Load is 1/255</span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span>Minimum MTU is 1500</span></div>
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<span style="font-family: Calibri;"><span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span>Hop count is 1</span></div>
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<br /></div>
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<span style="font-family: Calibri;">Formula is:</span></div>
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<span style="font-family: Calibri;">Eigrp Metric=256x[(10.000.000/ min bw in kbps along the path)+(total delay in tens of microseconds along the path)]</span></div>
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<span style="font-family: Calibri;">So;</span></div>
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<span style="font-family: Calibri;">256x[(10000000/10000)+(6000/10)]=256x1600=<b style="mso-bidi-font-weight: normal;">409600 </b>is the Eigrp metric for this route.</span></div>
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<br /></div>
</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-58647642794236512732011-12-26T04:05:00.000+02:002011-12-26T04:05:19.014+02:00Cisco RIP filtering routes with Prefix-Lists<div dir="ltr" style="text-align: left;" trbidi="on">
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: "Arial", "sans-serif";">Cisco RIP filtering routes with Prefix-Lists:</span></b></div>
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<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">Here is the topology for this example:</span></div>
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<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-92SZ2MP4qdE/TvfWHuyoyRI/AAAAAAAAAEw/IWah0WgxLcs/s1600/RIP-Topology1.png" imageanchor="1" style="clear: left; cssfloat: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="366" rea="true" src="http://3.bp.blogspot.com/-92SZ2MP4qdE/TvfWHuyoyRI/AAAAAAAAAEw/IWah0WgxLcs/s640/RIP-Topology1.png" width="640" /></a></div>
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<br /></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">We will configure R1 to filter the routes that come from R3:</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">Before the configuration:</span></div>
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<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">R1#show ip route rip</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>100.0.0.0/22 is subnetted, 1 subnets</span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>100.100.100.0 [120/4] <span style="color: red;">via 192.168.13.3</span>, 00:00:22, FastEthernet0/1</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">We configure <b style="mso-bidi-font-weight: normal;"><u>RIP filtering</u></b> with prefix-lists on R1:</span></div>
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<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">router rip</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>version 2</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.0.0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.12.0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.13.0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>distribute-list prefix FILTER gateway GW-R3 in</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">!</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">ip prefix-list FILTER seq 10 permit 0.0.0.0/0 le 32</span></div>
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<span style="font-family: "Arial", "sans-serif";">!</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">ip prefix-list GW-R3 seq 5 deny 192.168.13.3/32</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">ip prefix-list GW-R3 seq 10 permit 0.0.0.0/0 le 32</span></div>
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<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">After the configuration:</span></div>
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<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">R1#show ip route rip<span style="mso-spacerun: yes;"> </span></span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>100.0.0.0/22 is subnetted, 1 subnets</span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>100.100.100.0 [120/10] <span style="color: red;">via 192.168.12.2</span>, 00:00:04, FastEthernet0/0</span></div>
</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-86958345910349678392011-12-26T03:41:00.000+02:002011-12-26T03:41:22.142+02:00Cisco RIP Offset-list Configuration example<div dir="ltr" style="text-align: left;" trbidi="on">
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none; tab-stops: 317.25pt;">
<b style="mso-bidi-font-weight: normal;"><span style="font-family: "Arial", "sans-serif";">Cisco RIP Offset-list Configuration example:</span></b></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">The <b style="mso-bidi-font-weight: normal;"><u>RIP Offset-list</u></b> is used for adding metrics for inbound or outbound RIP updates.</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">Here is the topology for <b style="mso-bidi-font-weight: normal;"><u>RIP Offset-list</u></b> configuration example:</span></div>
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<br /></div>
<div class="separator" style="clear: both; text-align: center;">
<a href="http://3.bp.blogspot.com/-x0tL20KlH2c/TvfQhPNd2tI/AAAAAAAAAEk/DjfA8ylxIZ8/s1600/RIP-Topology1.png" imageanchor="1" style="clear: left; cssfloat: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="366" rea="true" src="http://3.bp.blogspot.com/-x0tL20KlH2c/TvfQhPNd2tI/AAAAAAAAAEk/DjfA8ylxIZ8/s640/RIP-Topology1.png" width="640" /></a></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">We will configure outbound <span style="mso-spacerun: yes;"> </span>RIP Offset-list on R2 for route 100.100.100.0/22.This outbound RIP Offset-list is attached for link to R1:</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">access-list 1 permit 100.100.100.0</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">router rip</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>version 2</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span><span style="color: red;">offset-list 1 out 5 FastEthernet0/0</span></span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.0.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none; tab-stops: 317.25pt;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.12.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none; tab-stops: 317.25pt;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.24.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none; tab-stops: 317.25pt;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>no auto-summary </span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none; tab-stops: 317.25pt;">
<br /></div>
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<span style="font-family: "Arial", "sans-serif";">R1`s routing table before this configuration:</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">R1#show ip route rip</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span><span style="color: red;">100.0.0.0/22 is subnetted, 1 subnets</span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none; tab-stops: 317.25pt;">
<span style="color: red; font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>100.100.100.0 [120/4] via 192.168.13.3, 00:00:25, FastEthernet0/1</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none; tab-stops: 317.25pt;">
<span style="color: red; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span>[120/4] via 192.168.12.2, 00:00:13, FastEthernet0/0</span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.24.0/24 [120/1] via 192.168.12.2, 00:00:13, FastEthernet0/0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none; tab-stops: 317.25pt;">
<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.34.0/24 [120/1] via 192.168.13.3, 00:00:25, FastEthernet0/1</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none; tab-stops: 317.25pt;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>192.168.0.0/32 is subnetted, 4 subnets</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none; tab-stops: 317.25pt;">
<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.0.2 [120/1] via 192.168.12.2, 00:00:13, FastEthernet0/0</span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.0.3 [120/1] via 192.168.13.3, 00:00:25, FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.0.4 [120/2] via 192.168.13.3, 00:00:25, FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>[120/2] via 192.168.12.2, 00:00:13, FastEthernet0/0</span></div>
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<br /></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">After the configuration:</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">R1#debug ip rip</span></div>
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<span style="font-family: "Arial", "sans-serif";">RIP protocol debugging is on</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 01:28:52.991: RIP: received packet with MD5 authentication</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 01:28:52.995: RIP: received v2 update from 192.168.12.2 on FastEthernet0/0</span></div>
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<span style="color: red; font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 01:28:52.995:<span style="mso-spacerun: yes;"> </span>100.100.100.0/22 via 0.0.0.0 in 9 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 01:28:52.995:<span style="mso-spacerun: yes;"> </span>192.168.0.2/32 via 0.0.0.0 in 1 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 01:28:52.999:<span style="mso-spacerun: yes;"> </span>192.168.0.4/32 via 0.0.0.0 in 2 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 01:28:52.999:<span style="mso-spacerun: yes;"> </span>192.168.24.0/24 via 0.0.0.0 in 1 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 01:28:52.999:<span style="mso-spacerun: yes;"> </span>192.168.34.0/24 via 0.0.0.0 in 2 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">R1`s routing table after RIP Offset-list configuration on R2:</span></div>
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<span style="font-family: "Arial", "sans-serif";">R1#show ip route rip</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span><span style="color: red;">100.0.0.0/22 is subnetted, 1 subnets</span></span></div>
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<span style="color: red; font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>100.100.100.0 [120/4] via 192.168.13.3, 00:00:23, FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.24.0/24 [120/1] via 192.168.12.2, 00:00:12, FastEthernet0/0</span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.34.0/24 [120/1] via 192.168.13.3, 00:00:23, FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>192.168.0.0/32 is subnetted, 4 subnets</span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.0.2 [120/1] via 192.168.12.2, 00:00:12, FastEthernet0/0</span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.0.3 [120/1] via 192.168.13.3, 00:00:23, FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.0.4 [120/2] via 192.168.13.3, 00:00:23, FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span>[120/2] via 192.168.12.2, 00:00:12, FastEthernet0/0</span></div>
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<span style="font-family: "Arial", "sans-serif";">If we dont use <b style="mso-bidi-font-weight: normal;"><u>access-list</u></b> and use <b style="mso-bidi-font-weight: normal;"><u>offset-list 0</u></b> command it influences all routes:</span></div>
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<span style="font-family: "Arial", "sans-serif";">On R2:</span></div>
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<span style="font-family: "Arial", "sans-serif";">router rip</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>version 2</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>offset-list 0 out 6 FastEthernet0/0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.0.0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.12.0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.24.0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></div>
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<span style="font-family: "Arial", "sans-serif";">R1#debug ip rip</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 01:38:29.923: RIP: received packet with MD5 authentication</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 01:38:29.923: RIP: received v2 update from 192.168.12.2 on FastEthernet0/0</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 01:38:29.927:<span style="mso-spacerun: yes;"> </span>100.100.100.0/22 via 0.0.0.0 in 10 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 01:38:29.927:<span style="mso-spacerun: yes;"> </span>192.168.0.2/32 via 0.0.0.0 in 7 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 01:38:29.931:<span style="mso-spacerun: yes;"> </span>192.168.0.4/32 via 0.0.0.0 in 8 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 01:38:29.931:<span style="mso-spacerun: yes;"> </span>192.168.24.0/24 via 0.0.0.0 in 7 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 01:38:29.935:<span style="mso-spacerun: yes;"> </span>192.168.34.0/24 via 0.0.0.0 in 8 hops</span></div>
</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-73975492439271903232011-12-26T03:18:00.001+02:002011-12-26T03:19:25.689+02:00Cisco RIP Summarization Configuration Example<div dir="ltr" style="text-align: left;" trbidi="on">
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<b style="mso-bidi-font-weight: normal;"><span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">RIP Summarization Configuration Example</span></b></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">We will configure <b style="mso-bidi-font-weight: normal;"><u>RIP Summarization</u></b> by using <b style="mso-bidi-font-weight: normal;">ip summary-address rip </b>command.</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">Here is the topology for this example:</span></div>
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<a href="http://3.bp.blogspot.com/-c0AbYGCB3Pk/TvfLRWYDh8I/AAAAAAAAAEY/BlDgPhbzkKY/s1600/RIP-Topology1.png" imageanchor="1" style="clear: left; cssfloat: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="366" rea="true" src="http://3.bp.blogspot.com/-c0AbYGCB3Pk/TvfLRWYDh8I/AAAAAAAAAEY/BlDgPhbzkKY/s640/RIP-Topology1.png" width="640" /></a></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">In this example we will create four connected interfaces on R4.We will redistribute them into RIP with metric of 3.Then we will do RIP summarization on R2 and R3 by using <b style="mso-bidi-font-weight: normal;"><u>ip summary-address rip</u></b> command.</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">Configurtion of R4:</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">interface Loopback0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>ip address 192.168.0.4 255.255.255.255</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">!</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">interface Loopback100</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>ip address 100.100.100.1 255.255.255.0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">!</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">interface Loopback101</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>ip address 100.100.101.1 255.255.255.0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">!</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">interface Loopback102</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>ip address 100.100.102.1 255.255.255.0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">!</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">interface Loopback103</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>ip address 100.100.103.1 255.255.255.0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">!</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">interface FastEthernet0/0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>ip address 192.168.24.4 255.255.255.0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">!</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">interface FastEthernet0/1</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>ip address 192.168.34.4 255.255.255.0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">!</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">router rip</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>version 2</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>redistribute connected metric 3</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>network 192.168.0.0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>network 192.168.24.0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>network 192.168.34.0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></div>
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<br /></div>
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<br /></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">Then we see that R2 and R3 gets these connected routes:</span></div>
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<br /></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">R3#show ip route rip</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">R<span style="mso-spacerun: yes;"> </span>192.168.12.0/24 [120/1] via 192.168.13.1, 00:00:08, FastEthernet0/0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>100.0.0.0/24 is subnetted, 4 subnets</span></div>
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<span style="color: red; font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>100.100.100.0 [120/3] via 192.168.34.4, 00:00:17, FastEthernet0/1</span></div>
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<span style="color: red; font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>100.100.101.0 [120/3] via 192.168.34.4, 00:00:17, FastEthernet0/1</span></div>
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<span style="color: red; font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>100.100.102.0 [120/3] via 192.168.34.4, 00:00:17, FastEthernet0/1</span></div>
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<span style="color: red; font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>100.100.103.0 [120/3] via 192.168.34.4, 00:00:17, FastEthernet0/1</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">R<span style="mso-spacerun: yes;"> </span>192.168.24.0/24 [120/1] via 192.168.34.4, 00:00:17, FastEthernet0/1</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span>192.168.0.0/32 is subnetted, 4 subnets</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">R<span style="mso-spacerun: yes;"> </span>192.168.0.1 [120/1] via 192.168.13.1, 00:00:08, FastEthernet0/0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">R<span style="mso-spacerun: yes;"> </span>192.168.0.2 [120/2] via 192.168.34.4, 00:00:17, FastEthernet0/1</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;"><span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span>[120/2] via 192.168.13.1, 00:00:08, FastEthernet0/0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">R<span style="mso-spacerun: yes;"> </span>192.168.0.4 [120/1] via 192.168.34.4, 00:00:17, FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";">On R2 and R3 we will configure <b style="mso-bidi-font-weight: normal;"><u>RIP summarization</u></b> by using <b style="mso-bidi-font-weight: normal;"><u>ip summary-address rip</u></b></span></div>
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<span style="font-family: "Arial", "sans-serif";">Command:</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">interface FastEthernet0/0</span></div>
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<span style="font-family: "Arial", "sans-serif";">ip summary-address rip 100.100.100.0 255.255.252.0</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">R1 gets the summary, not the more specific routes:</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">R1#show ip route rip</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>100.0.0.0/22 is subnetted, 1 subnets</span></div>
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<span style="color: red; font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>100.100.100.0 [120/4] via 192.168.13.3, 00:00:24, FastEthernet0/1</span></div>
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<span style="color: red; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span>[120/4] via 192.168.12.2, 00:00:26, FastEthernet0/0</span><span style="font-family: "Arial", "sans-serif";"></span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.24.0/24 [120/1] via 192.168.12.2, 00:00:26, FastEthernet0/0</span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.34.0/24 [120/1] via 192.168.13.3, 00:00:24, FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>192.168.0.0/32 is subnetted, 4 subnets</span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.0.2 [120/1] via 192.168.12.2, 00:00:26, FastEthernet0/0</span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.0.3 [120/1] via 192.168.13.3, 00:00:24, FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.0.4 [120/2] via 192.168.13.3, 00:00:24, FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>[120/2] via 192.168.12.2, 00:00:26, FastEthernet0/0</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">Lets check the reachability:</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">R1#ping 100.100.100.1 source 192.168.0.1</span></div>
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<span style="font-family: "Arial", "sans-serif";">Type escape sequence to abort.</span></div>
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<span style="font-family: "Arial", "sans-serif";">Sending 5, 100-byte ICMP Echos to 100.100.100.1, timeout is 2 seconds:</span></div>
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<span style="font-family: "Arial", "sans-serif";">Packet sent with a source address of 192.168.0.1 </span></div>
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<span style="font-family: "Arial", "sans-serif";">!!!!!</span></div>
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<span style="font-family: "Arial", "sans-serif";">Success rate is 100 percent (5/5), round-trip min/avg/max = 28/55/88 ms</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">R1#ping 100.100.101.1 source 192.168.0.1</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">Type escape sequence to abort.</span></div>
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<span style="font-family: "Arial", "sans-serif";">Sending 5, 100-byte ICMP Echos to 100.100.101.1, timeout is 2 seconds:</span></div>
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<span style="font-family: "Arial", "sans-serif";">Packet sent with a source address of 192.168.0.1 </span></div>
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<span style="font-family: "Arial", "sans-serif";">!!!!!</span></div>
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<span style="font-family: "Arial", "sans-serif";">Success rate is 100 percent (5/5), round-trip min/avg/max = 36/64/92 ms</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">R1#ping 100.100.102.1 source 192.168.0.1</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">Type escape sequence to abort.</span></div>
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<span style="font-family: "Arial", "sans-serif";">Sending 5, 100-byte ICMP Echos to 100.100.102.1, timeout is 2 seconds:</span></div>
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<span style="font-family: "Arial", "sans-serif";">Packet sent with a source address of 192.168.0.1 </span></div>
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<span style="font-family: "Arial", "sans-serif";">!!!!!</span></div>
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<span style="font-family: "Arial", "sans-serif";">Success rate is 100 percent (5/5), round-trip min/avg/max = 60/68/88 ms</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">R1#ping 100.100.103.1 source 192.168.0.1</span></div>
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<br /></div>
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<span style="font-family: "Arial", "sans-serif";">Type escape sequence to abort.</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none; tab-stops: 317.25pt;">
<span style="font-family: "Arial", "sans-serif";">Sending 5, 100-byte ICMP Echos to 100.100.103.1, timeout is 2 seconds:</span></div>
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<span style="font-family: "Arial", "sans-serif";">Packet sent with a source address of 192.168.0.1 </span></div>
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<span style="font-family: "Arial", "sans-serif";">!!!!!</span></div>
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<span style="font-family: "Arial", "sans-serif";">Success rate is 100 percent (5/5), round-trip min/avg/max = 56/80/96 ms</span></div>
</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-53513494530497551822011-12-26T03:00:00.000+02:002011-12-26T03:00:55.944+02:00Cisco RIP Authentication Configuration Example<div dir="ltr" style="text-align: left;" trbidi="on">
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: "Arial", "sans-serif";">Cisco RIP Authentication Configuration Example</span></b></div>
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<span style="font-family: "Arial", "sans-serif";">We will configure <b style="mso-bidi-font-weight: normal;"><u>RIP Authentication</u></b> on Cisco routers.We will use RIP Version 2, because RIP version 1 does not support authentication.</span></div>
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<span style="font-family: "Arial", "sans-serif";">Here is the topology for <b style="mso-bidi-font-weight: normal;"><u>RIP Authentication</u></b> configuration example:</span></div>
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<span style="font-family: "Arial", "sans-serif";">Firstly we will configure R1 as below:</span></div>
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<span style="font-family: "Arial", "sans-serif";">key chain AUTHENTICATION</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>key 10</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span>key-string CISCO</span></div>
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<span style="font-family: "Arial", "sans-serif";">!</span></div>
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<span style="font-family: "Arial", "sans-serif";">interface Loopback0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.0.1 255.255.255.255</span></div>
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<span style="font-family: "Arial", "sans-serif";">!</span></div>
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<span style="font-family: "Arial", "sans-serif";">interface FastEthernet0/0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.12.1 255.255.255.0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip rip authentication mode md5</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip rip authentication key-chain AUTHENTICATION</span></div>
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<span style="font-family: "Arial", "sans-serif";">!<span style="mso-spacerun: yes;"> </span></span></div>
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<span style="font-family: "Arial", "sans-serif";">interface FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.13.1 255.255.255.0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>!</span></div>
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<span style="font-family: "Arial", "sans-serif";">router rip</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>version 2</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.0.0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.12.0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.13.0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></div>
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<span style="font-family: "Arial", "sans-serif";">We see that R1 ignores the updates that come from R2, because we did not <b style="mso-bidi-font-weight: normal;">configure <u>RIP authentication</u></b> on R2 yet:</span></div>
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<span style="font-family: "Arial", "sans-serif";">R1#debug ip rip</span></div>
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<span style="font-family: "Arial", "sans-serif";">RIP protocol debugging is on</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:47:47.191: RIP: received v2 update from 192.168.13.3 on FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:47:47.195:<span style="mso-spacerun: yes;"> </span>192.168.0.3/32 via 0.0.0.0 in 1 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:47:47.195:<span style="mso-spacerun: yes;"> </span>192.168.0.4/32 via 0.0.0.0 in 2 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:47:47.195:<span style="mso-spacerun: yes;"> </span>192.168.24.0/24 via 0.0.0.0 in 2 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:47:47.199:<span style="mso-spacerun: yes;"> </span>192.168.34.0/24 via 0.0.0.0 in 1 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">*<span style="color: red;">Mar<span style="mso-spacerun: yes;"> </span>1 00:47:54.951: RIP: ignored v2 packet from 192.168.12.2 (invalid authentication)</span></span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">After we have done same <b style="mso-bidi-font-weight: normal;"><u>RIP authentication</u></b> on R2, then R1 accepts the RIP updates that come from R2:</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">R1#debug ip rip </span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">RIP protocol debugging is on</span></div>
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<span style="color: red; font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:56:11.927: RIP: received packet with MD5 authentication</span></div>
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<span style="color: red; font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:56:11.927: RIP: received v2 update from 192.168.12.2 on FastEthernet0/0</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">*Mar<span style="mso-spacerun: yes;"> </span>1 00:56:11.927:<span style="mso-spacerun: yes;"> </span>192.168.0.2/32 via 0.0.0.0 in 1 hops</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">*Mar<span style="mso-spacerun: yes;"> </span>1 00:56:11.931:<span style="mso-spacerun: yes;"> </span>192.168.0.4/32 via 0.0.0.0 in 2 hops</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">*Mar<span style="mso-spacerun: yes;"> </span>1 00:56:11.931:<span style="mso-spacerun: yes;"> </span>192.168.24.0/24 via 0.0.0.0 in 1 hops</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">*Mar<span style="mso-spacerun: yes;"> </span>1 00:56:11.935:<span style="mso-spacerun: yes;"> </span>192.168.34.0/24 via 0.0.0.0 in 2 hops</span></div>
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<span style="color: black; font-family: "Arial", "sans-serif"; mso-themecolor: text1;">In RIP Authentication Key chain names may be different on neighboring routers, but <b style="mso-bidi-font-weight: normal;"><u>key-id</u></b> and <b style="mso-bidi-font-weight: normal;"><u>key-string</u></b> must match.</span></div>
</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-78568201668197389562011-12-26T02:44:00.000+02:002011-12-26T02:44:17.185+02:00Basic Cisco RIP Version 2 Configuration Example<div dir="ltr" style="text-align: left;" trbidi="on">
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<b style="mso-bidi-font-weight: normal;"><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">Basic Cisco RIP Version 2 Configuration Example:</span></b></div>
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<span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">Here is the configuration example topology for <b style="mso-bidi-font-weight: normal;"><u>RIP version 2</u></b>:</span></div>
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<a href="http://3.bp.blogspot.com/-rLSMEphyBp0/TvfDHV1wUPI/AAAAAAAAAEA/WI3vRP-vS1s/s1600/RIP-Topology1.png" imageanchor="1" style="clear: left; cssfloat: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="366" rea="true" src="http://3.bp.blogspot.com/-rLSMEphyBp0/TvfDHV1wUPI/AAAAAAAAAEA/WI3vRP-vS1s/s640/RIP-Topology1.png" width="640" /></a></div>
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<span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">Configurations of routers for <b style="mso-bidi-font-weight: normal;"><u>RIP version 2</u></b>:</span></div>
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<span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">R1</span></div>
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<span style="font-family: "Arial", "sans-serif";">!</span></div>
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<span style="font-family: "Arial", "sans-serif";">interface Loopback0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.0.1 255.255.255.255</span></div>
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<span style="font-family: "Arial", "sans-serif";">!</span></div>
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<span style="font-family: "Arial", "sans-serif";">interface FastEthernet0/0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.12.1 255.255.255.0 </span></div>
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<span style="font-family: "Arial", "sans-serif";">!</span></div>
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<span style="font-family: "Arial", "sans-serif";">interface FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.13.1 255.255.255.0</span></div>
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<span style="font-family: "Arial", "sans-serif";">!</span></div>
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<span style="font-family: "Arial", "sans-serif";">router rip</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>version 2</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.0.0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.12.0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.13.0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></div>
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<span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">R2</span></div>
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<span style="font-family: "Arial", "sans-serif";">!</span></div>
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<span style="font-family: "Arial", "sans-serif";">interface Loopback0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.0.2 255.255.255.255</span></div>
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<span style="font-family: "Arial", "sans-serif";">!</span></div>
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<span style="font-family: "Arial", "sans-serif";">interface FastEthernet0/0</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.12.2 255.255.255.0 </span></div>
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<span style="font-family: "Arial", "sans-serif";">!</span></div>
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<span style="font-family: "Arial", "sans-serif";">interface FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.24.2 255.255.255.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">!</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">router rip</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>version 2</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.0.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.12.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.24.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">R3</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">!</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">interface Loopback0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.0.3 255.255.255.255</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">!</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">interface FastEthernet0/0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.13.3 255.255.255.0 </span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">!</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">interface FastEthernet0/1</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.34.3 255.255.255.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">!</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">router rip</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>version 2</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.0.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.13.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.34.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">R4</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">!</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">interface Loopback0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.0.4 255.255.255.255</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">!</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">interface FastEthernet0/0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.24.4 255.255.255.0 </span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">!</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">interface FastEthernet0/1</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>ip address 192.168.34.4 255.255.255.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">!</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">router rip</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>version 2</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.0.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.24.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>network 192.168.34.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>no auto-summary</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">Lets check the routing table of R1 for <b style="mso-bidi-font-weight: normal;"><u>RIP version 2</u></b> routes:</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">R1#show ip route rip</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.24.0/24 [120/1] via 192.168.12.2, 00:00:14, FastEthernet0/0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.34.0/24 [120/1] via 192.168.13.3, 00:00:03, FastEthernet0/1</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>192.168.0.0/32 is subnetted, 4 subnets</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.0.2 [120/1] via 192.168.12.2, 00:00:14, FastEthernet0/0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.0.3 [120/1] via 192.168.13.3, 00:00:03, FastEthernet0/1</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">R<span style="mso-spacerun: yes;"> </span>192.168.0.4 [120/2] via 192.168.13.3, 00:00:03, FastEthernet0/1</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>[120/2] via 192.168.12.2, 00:00:14, FastEthernet0/0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">Since we have configured basic <b style="mso-bidi-font-weight: normal;"><u>RIP version 2</u></b> with no additional features, all timer, filters etc are stay as default:</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">R1#show ip protocols</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">Routing Protocol is "rip"</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Outgoing update filter list for all interfaces is not set</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Incoming update filter list for all interfaces is not set</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Sending updates every 30 seconds, next due in 27 seconds</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Invalid after 180 seconds, hold down 180, flushed after 240</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Redistributing: rip</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Default version control: send version 2, receive version 2</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Interface<span style="mso-spacerun: yes;"> </span>Send<span style="mso-spacerun: yes;"> </span>Recv<span style="mso-spacerun: yes;"> </span>Triggered RIP<span style="mso-spacerun: yes;"> </span>Key-chain</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>FastEthernet0/0<span style="mso-spacerun: yes;"> </span>2<span style="mso-spacerun: yes;"> </span>2<span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>FastEthernet0/1<span style="mso-spacerun: yes;"> </span>2<span style="mso-spacerun: yes;"> </span>2<span style="mso-spacerun: yes;"> </span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Loopback0<span style="mso-spacerun: yes;"> </span>2<span style="mso-spacerun: yes;"> </span>2<span style="mso-spacerun: yes;"> </span></span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Automatic network summarization is not in effect</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Maximum path: 4</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Routing for Networks:</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span><span style="mso-spacerun: yes;"> </span>192.168.0.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>192.168.12.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>192.168.13.0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Routing Information Sources:</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Gateway<span style="mso-spacerun: yes;"> </span>Distance<span style="mso-spacerun: yes;"> </span>Last Update</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>192.168.13.3<span style="mso-spacerun: yes;"> </span>120<span style="mso-spacerun: yes;"> </span>00:00:14</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>192.168.12.2<span style="mso-spacerun: yes;"> </span>120<span style="mso-spacerun: yes;"> </span>00:00:27</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Distance: (default is 120)</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">Lets debug the RIP version 2 packets:</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">R1#debug ip rip</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">RIP protocol debugging is on</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<br /></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:03.275: RIP: sending v2 update to 224.0.0.9 via FastEthernet0/0 (192.168.12.1)</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:03.275: RIP: build update entries</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:03.275:<span style="mso-spacerun: yes;"> </span>192.168.0.1/32 via 0.0.0.0, metric 1, tag 0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:03.279:<span style="mso-spacerun: yes;"> </span>192.168.0.3/32 via 0.0.0.0, metric 2, tag 0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:03.279:<span style="mso-spacerun: yes;"> </span>192.168.13.0/24 via 0.0.0.0, metric 1, tag 0</span></div>
<div class="MsoNormal" style="line-height: normal; margin: 0cm 0cm 0pt; mso-layout-grid-align: none;">
<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:03.279:<span style="mso-spacerun: yes;"> </span>192.168.34.0/24 via 0.0.0.0, metric 2, tag 0</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:10.055: RIP: sending v2 update to 224.0.0.9 via FastEthernet0/1 (192.168.13.1)</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:10.055: RIP: build update entries</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:10.055:<span style="mso-spacerun: yes;"> </span>192.168.0.1/32 via 0.0.0.0, metric 1, tag 0</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:10.059:<span style="mso-spacerun: yes;"> </span>192.168.0.2/32 via 0.0.0.0, metric 2, tag 0</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:10.059:<span style="mso-spacerun: yes;"> </span>192.168.12.0/24 via 0.0.0.0, metric 1, tag 0</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:10.059:<span style="mso-spacerun: yes;"> </span>192.168.24.0/24 via 0.0.0.0, metric 2, tag 0</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:10.999: RIP: received v2 update from 192.168.13.3 on FastEthernet0/1</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:10.999:<span style="mso-spacerun: yes;"> </span>192.168.0.3/32 via 0.0.0.0 in 1 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:11.003:<span style="mso-spacerun: yes;"> </span>192.168.0.4/32 via 0.0.0.0 in 2 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">R1#</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:11.003:<span style="mso-spacerun: yes;"> </span>192.168.24.0/24 via 0.0.0.0 in 2 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";">*Mar<span style="mso-spacerun: yes;"> </span>1 00:36:11.007:<span style="mso-spacerun: yes;"> </span>192.168.34.0/24 via 0.0.0.0 in 1 hops</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-tab-count: 1;"> </span></span></div>
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<span style="font-family: "Arial", "sans-serif";">Lets test the reachability:</span></div>
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<span style="font-family: "Arial", "sans-serif";">R1#ping 192.168.0.4 source 192.168.0.1</span></div>
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<span style="font-family: "Arial", "sans-serif";">Type escape sequence to abort.</span></div>
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<span style="font-family: "Arial", "sans-serif";">Sending 5, 100-byte ICMP Echos to 192.168.0.4, timeout is 2 seconds:</span></div>
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<span style="font-family: "Arial", "sans-serif";">Packet sent with a source address of 192.168.0.1 </span></div>
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<span style="font-family: "Arial", "sans-serif";">!!!!!</span></div>
<span style="font-family: "Arial", "sans-serif"; font-size: 11pt; line-height: 115%; mso-ansi-language: TR; mso-bidi-language: AR-SA; mso-fareast-font-family: Calibri; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin;">Success rate is 100 percent (5/5), round-trip min/avg/max = 60/72/92 ms</span></div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-49172443616435934292011-12-26T01:52:00.000+02:002011-12-26T01:52:20.777+02:00RIP Split Horizon<div dir="ltr" style="text-align: left;" trbidi="on">
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: "Arial", "sans-serif";"><u>Split Horizon</u></span></b></div>
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<b style="mso-bidi-font-weight: normal;"><i><u><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">Split horizon</span></u></i></b><i><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;"> </span></i><span style="color: #333333; font-family: "Verdana", "sans-serif"; font-size: 10pt; mso-bidi-font-family: Verdana;">is used to avoid routing loops. With <b style="mso-bidi-font-weight: normal;"><u>Split horizon</u></b>, when a route is learned through an interface, that route is not sent back out on the same interface. For example, Router1 gets an update about a network with a metric of 3 from the neighboring Router2.Router1 will not advertise network back to Router2 if the split horizon is enabled. If <b style="mso-bidi-font-weight: normal;"><u>Split horizon</u></b> is disabled, Router1 will advertise the network with a metric of 4 to Router2. If Router2 loses reachability to the that network, it thinks that Router1 has a better path to get to that network.Then it sends the IP packets to Router1 and Router1 drops the packets.</span><span style="font-family: "Arial", "sans-serif";"></span></div>
</div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-8330873687355731587.post-92006308870298838102011-12-26T01:50:00.000+02:002011-12-26T01:50:55.472+02:00RIP timers<div dir="ltr" style="text-align: left;" trbidi="on">
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<b style="mso-bidi-font-weight: normal;"><u><span style="color: #333333; font-family: "Arial", "sans-serif";">RIP</span></u></b><span style="color: #333333; font-family: "Arial", "sans-serif";"> (Routing Information Protocol) uses the following timers:</span></div>
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<b><span style="color: #333333; font-family: "Arial", "sans-serif";">Update</span></b><span style="color: #333333; font-family: "Arial", "sans-serif";">— The time interval between each update. It is set to 30 seconds, by default.</span></div>
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<b><span style="color: #333333; font-family: "Arial", "sans-serif";">Invalid</span></b><span style="color: #333333; font-family: "Arial", "sans-serif";">— The time after which a suspect route becomes invalid. It is set to 180 seconds,</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">by default.</span></div>
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<b><span style="color: #333333; font-family: "Arial", "sans-serif";">Hold-down</span></b><span style="color: #333333; font-family: "Arial", "sans-serif";">— The time used to suppress the possibility of defective routes being installed in the routing table. The default time is 180 seconds.</span></div>
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<b><span style="color: #333333; font-family: "Arial", "sans-serif";">Flush</span></b><span style="color: #333333; font-family: "Arial", "sans-serif";">— The time after that a route is removed from the Routing Table.It is set to 240 seconds, by default</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">All these timer values are configurable with <b style="mso-bidi-font-weight: normal;"><u>timers basic</u></b> command</span></div>
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<b style="mso-bidi-font-weight: normal;"><span style="color: #333333; font-family: "Arial", "sans-serif";">Configuration example :</span></b></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Before the configuration of <b style="mso-bidi-font-weight: normal;"><u>timers basic</u></b> command:</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Router#show ip protocols<span style="mso-spacerun: yes;"> </span></span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";">Routing Protocol is "rip"</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Sending updates every 30 seconds, next due in 10 seconds</span></div>
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<span style="color: #333333; font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Invalid after 180 seconds, hold down 180, flushed after 240</span></div>
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<span style="font-family: "Arial", "sans-serif";">router rip</span></div>
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<b style="mso-bidi-font-weight: normal;"><span style="font-family: "Arial", "sans-serif";">timers basic</span></b><span style="font-family: "Arial", "sans-serif";"> 5 15 15 30</span></div>
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<span style="font-family: "Arial", "sans-serif";">Router#show ip protocols </span></div>
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<span style="font-family: "Arial", "sans-serif";">Routing Protocol is "rip"</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Sending updates every 5 seconds, next due in 28 seconds</span></div>
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<span style="font-family: "Arial", "sans-serif";"><span style="mso-spacerun: yes;"> </span>Invalid after 15 seconds, hold down 15, flushed after 30</span></div>
</div>Unknownnoreply@blogger.com0