Configuration For Lfa (With Ospf); Configuration For Lfa (With Isis); Verifying Lfa - Cisco ASR 903 Manual

▀ BFD Triggered TE Fast Reroute

Configuration for LFA (with OSPF)

ASR903-R1 Configuration
router ospf 1
router-id 172.16.1.1
fast-reroute per-prefix enable prefix-priority low
network 172.16.1.1 0.0.0.0 area 0
network 10.10.1.0 0.0.0.255 area 0
network 10.10.2.0 0.0.0.255 area 0

Configuration for LFA (with ISIS)

ASR903-R1 Configuration
interface GigabitEthernet0/2/0
ip address 10.10.1.1 255.255.255.0
ip router isis
negotiation auto
mpls ip
isis network point-to-point
!
interface GigabitEthernet0/2/2
ip address 10.10.2.1 255.255.255.0
ip router isis
negotiation auto
mpls ip
isis network point-to-point
!
router isis
net 49.0001.0000.0000.0001.00
fast-reroute per-prefix level-1 all
fast-reroute per-prefix level-2 all
passive-interface Loopback0

Verifying LFA

ASR903-R1# show ip route 172.16.4.4
Routing entry for 172.16.4.4/32
Known via "ospf 1", distance 110, metric 3, type intra area
Last update from 10.10.1.2 on GigabitEthernet0/2/0, 00:00:06 ago
Routing Descriptor Blocks:
10.10.2.2, from 172.16.4.4, 00:00:06 ago, via GigabitEthernet0/2/2
Route metric is 3, traffic share count is 1
Repair Path: 10.10.1.2, via GigabitEthernet0/2/0
* 10.10.1.2, from 172.16.4.4, 00:00:06 ago, via GigabitEthernet0/2/0
Route metric is 3, traffic share count is 1
Repair Path: 10.10.2.2, via GigabitEthernet0/2/2
▄ Cisco ASR 903 Router Design and Deployment Guide
106
LFA & Remote LFA (rLFA)
OL-30526-01