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Implementing IS-IS on Cisco IOS XR Software
How to Implement IS-IS on Cisco IOS XR Software
RC-313
Cisco IOS XR Routing Configuration Guide
OL-14356-01
Configuring IP Fast Reroute Loop-free Alternate
This optional task describes how to enable the IP fast reroute (IPFRR) loop-free alternate (LFA)
computation to converge traffic flows around link failures.
Note To enable node protection on broadcast links, IPFRR and bidirectional forwarding detection (BFD) must
be enabled on the interface under IS-IS.
Restrictions
IPFRR is supported on the Cisco CRS-1 router only. IPv4 address families and single-level interfaces
are supported.
Multiprotocol Label Switching (MPLS) FRR and IPFRR cannot be configured on the same interface
simultaneously.
SUMMARY STEPS
1. configure
2. router isis instance-id
3. interface type instance
4. circuit-type {level-1 | level-2-only}
5. address-family ipv4 [unicast]
6. ipfrr lfa {level {1 | 2}}
7. end
or
commit
DETAILED STEPS
Command or Action Purpose
Step 1
configure
Example:
RP/0/RP0/CPU0:router# configure
Enters global configuration mode.
Step 2
router isis instance-id
Example:
RP/0/RP0/CPU0:router(config)# router isis isp
Enables IS-IS routing for the specified routing process, and
places the router in router configuration mode. In this
example, the IS-IS instance is called isp.
Step 3
interface type instance
Example:
RP/0/RP0/CPU0:router(config-isis)# interface
POS 0/1/0/3
Enters interface configuration mode.