Bgp route filtering with Route-map
In this example we are only announcing default route and filtering specific routes.
Here is the configuration:
router bgp 65500
no synchronization
bgp log-neighbor-changes
network 0.0.0.0
network 192.168.1.0 mask 255.255.255.0
neighbor 10.10.10.2 remote-as 65500
neighbor 10.10.10.2 route-map spoke-out out
ip prefix-list defaultroute seq 5 permit 0.0.0.0/0
route-map spoke-out permit 10
match ip address prefix-list defaultroute
set metric 0
set ip next-hop 10.10.10.1
We see that, we have 192.168.1.0/24 network in our bgp table.
R1#show ip bgp
BGP table version is 4, local router ID is 10.10.10.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 0.0.0.0 10.10.10.254 0 32768 i
*> 192.168.1.0 0.0.0.0 0 32768 i
But we are not advertising it to the remote neighbor:
R1#show ip bgp neighbors 10.10.10.2 advertised-routes
BGP table version is 4, local router ID is 10.10.10.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 0.0.0.0 10.10.10.254 0 32768 i
Total number of prefixes 1
Lets also check the remote router:
R4#show ip bgp neighbors 10.10.10.1 routes
BGP table version is 3, local router ID is 10.10.10.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i0.0.0.0 10.10.10.1 0 100 0 i
Total number of prefixes 1
