Configuring Ip Fast Reroute Loop-Free Alternate; Enabling Ipfrr Lfa - Cisco ASR 9000 Series Configuration Manual

Implementing OSPF

Configuring IP Fast Reroute Loop-free Alternate

This task describes how to enable the IP fast reroute (IPFRR) per-link loop-free alternate (LFA) computation
to converge traffic flows around link failures.
To enable protection on broadcast links, IPFRR and bidirectional forwarding detection (BFD) must be enabled
on the interface under OSPF.

Enabling IPFRR LFA

SUMMARY STEPS
1. configure
2. router ospf process-name
3. area area-id
4. interface type interface-path-id
5. fast-reroute per-link { enable | disable }
6. commit
DETAILED STEPS
Command or Action
Step 1 configure
Step 2 router ospf process-name
Example:
RP/0/RSP0/CPU0:router(config)# router ospf
Step 3
area area-id
Example:
RP/0/RSP0/CPU0:router(config-ospf)#area 1
Step 4 interface type interface-path-id
Example:
RP/0/RSP0/CPU0:router(config-ospf-ar)#
GigabitEternet0/5/0/0
Step 5 fast-reroute per-link { enable | disable }
Example:
RP/0/RSP0/CPU0:router(config-ospf-ar)#fast-reroute
per-link enable
Step 6
commit
OL-30423-03
interface
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
Configuring IP Fast Reroute Loop-free Alternate
Purpose
Enables OSPF routing for the specified routing
process and places the router in router configuration
mode.
Enters area configuration mode.
Enters interface configuration mode and associates
one or more interfaces to the area. .
Enables or disables per-link LFA computation for
the interface.
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