Cisco NCS 6000 Series Configuration Manual page 350

Configure Remote Loop-Free Alternate Paths for OSPF
RP/0/RP0/CPU0:router(config-ospf-ar)#exit
RP/0/RP0/CPU0:router(config-ospf)#microloop avoidance protected
RP/0/RP0/CPU0:router(config-ospf)#exit
The maximum-cost command is required to limit the range of remote LFAs. The microloop avoidance
command is used to delay the convergence of all or protected prefixes (as configured in this example).
For more information on these commands, see the Cisco ASR 9000 Series Aggregation Services Router
Routing Command Reference.
4. Commit your configuration.
RP/0/RP0/CPU0:router(config)#commit
5. Confirm your configuration.
RP/0/RP0/CPU0:router(config)#show running-config
...
!
interface GigabitEthernet0/0/0/1
ipv4 address 10.1.1.1 255.255.255.0
!
interface GigabitEthernet0/0/0/2
ipv4 address 10.10.10.1 255.255.255.0
shutdown
interface loopback0
ipv4 address 10.1.1.1 255.255.255.255
shutdown
...
!
router ospf rlfa
router-id 10.1.1.1
microloop avoidance protected
area 1
interface GigabitEthernet0/0/0/1
fast-reroute per-prefix remote-lfa tunnel mpls-ldp
fast-reroute per-prefix remote-lfa maximum-cost 20
!
!
!
...
Sample Verification Outputs
You can run the show commands mentioned in this section to verify whether RLFA is operational in your
network. This section lists the sample outputs that are retrieved depending on your network topology.
RIB Verification
Verify the presence of the remote backup paths in the RIB.
RP/0/RP0/CPU0:router#show route 10.1.1.1/32
Routing entry for 10.1.1.1/32
Known via "ospf 100", distance 110, metric 20, type extern 2
Installed Sep
Routing Descriptor Blocks
13.0.0.3, from 10.1.1.1, via GigabitEthernet0/0/0/1, Protected
...
131.1.1.4, from 10.10.10.1 via GigabitEthernet0/0/0/2, Backup (remote)
...
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
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Implementing OSPF