Cisco IOS XR MPLS TE Fast Reroute Example

Cisco IOS XR MPLS TE Fast Reroute Example

In this example we will show Cisco IOS XR MPLS Traffic Engineering Fast Reroute configuration briefly.Here is our basic topology for this configuration:

We have configured MPLS TE tunnel between R5 and R1.
Configuration on head end router:

router ospf 1
 router-id 5.5.5.5
 area 0
 mpls traffic-eng
 interface GigabitEthernet0/1/0/0

mpls traffic-eng
 interface GigabitEthernet0/1/0/0

rsvp
 interface GigabitEthernet0/1/0/0

explicit-path name to-router5
 index 1 next-address strict ipv4 unicast 4.4.4.4
 index 2 next-address strict ipv4 unicast 3.3.3.3
 index 3 next-address strict ipv4 unicast 5.5.5.5

interface tunnel-te5
 ipv4 unnumbered Loopback0
 load-interval 30
 autoroute announce
 destination 5.5.5.5
 fast-reroute
 path-option 1 explicit name to-router5
 path-option 2 dynamic

We will protect the link between R4(4.4.4.4) and R3(3.3.3.3).When the link between R3 and R4 fails, all MPLS TE traffic will pass through Router2(2.2.2.2) until the new path converges(because we have secondary dynamic path option).

Configuration on Point of Local Repair router(router4):

router ospf 1
 router-id 4.4.4.4
 area 0
 mpls traffic-eng
 interface GigabitEthernet0/1/0/0
 interface GigabitEthernet0/1/0/1
 interface GigabitEthernet0/1/0/2

mpls traffic-eng
 interface GigabitEthernet0/1/0/0
 interface GigabitEthernet0/1/0/1
  backup-path tunnel-te 23
 interface GigabitEthernet0/1/0/2

rsvp
 interface GigabitEthernet0/1/0/0
 interface GigabitEthernet0/1/0/1
 interface GigabitEthernet0/1/0/2

explicit-path name backupto-r3
 index 1 next-address strict ipv4 unicast 2.2.2.2
 index 2 next-address strict ipv4 unicast 3.3.3.3

interface tunnel-te23
 ipv4 unnumbered Loopback0
 load-interval 30
 destination 3.3.3.3
 path-option 1 explicit name backupto-r3


RP/0/RSP1/CPU0:Router4#show mpls traffic-eng fast-reroute database
LSP midpoint FRR information:
LSP Identifier                Local  Out Intf/        FRR Intf/        Status
                              Label  Label            Label                  
----------------------------- ------ ---------------- ---------------- -------
5.5.5.5 5                 143987 Gi0/1/0/1:16014      tt23:16015         Ready