Cisco CRS Configuration Guide

This example shows how to configure TE tunnel as LFA backup:
router isis TEST
net 49.0001.0000.0000.0001.00
address-family ipv4 unicast
metric-style wide
interface GigabitEthernet0/6/0/13
point-to-point
address-family ipv4 unicast
fast-reroute per-prefix
# primary path GigabitEthernet0/6/0/13 will exclude the interface
# GigabitEthernet0/6/0/33 in LFA backup path computation. TE tunnel 1001
# is using the link GigabitEthernet0/6/0/33.
fast-reroute per-prefix exclude interface GigabitEthernet0/6/0/33
fast-reroute per-prefix lfa-candidate interface tunnel-te1001
!
interface GigabitEthernet0/6/0/33
point-to-point
address-family ipv4 unicast
!
This example shows how to configure LFA FRR with configurable tie-break configuration:
router isis TEST
net 49.0001.0000.0000.0001.00
address-family ipv4 unicast
metric-style wide
fast-reroute per-prefix tiebreaker ?
downstream Prefer backup path via downstream node
lc-disjoint Prefer line card disjoint backup path
lowest-backup-metric Prefer backup path with lowest total metric
node-protecting Prefer node protecting backup path
primary-path Prefer backup path from ECMP set
secondary-path Prefer non-ECMP backup path
fast-reroute per-prefix tiebreaker lc-disjoint index ?
<1-255> Index
fast-reroute per-prefix tiebreaker lc-disjoint index 10
Sample configuration:
router isis TEST
net 49.0001.0000.0000.0001.00
address-family ipv4 unicast
metric-style wide
fast-reroute per-prefix tiebreaker downstream index 60
fast-reroute per-prefix tiebreaker lc-disjoint index 10
fast-reroute per-prefix tiebreaker lowest-backup-metric index 40
fast-reroute per-prefix tiebreaker node-protecting index 30
fast-reroute per-prefix tiebreaker primary-path index 20
fast-reroute per-prefix tiebreaker secondary-path index 50
!
interface GigabitEthernet0/6/0/13
point-to-point
address-family ipv4 unicast
fast-reroute per-prefix
!
interface GigabitEthernet0/1/0/13
point-to-point
address-family ipv4 unicast
fast-reroute per-prefix
!
interface GigabitEthernet0/3/0/0.1
point-to-point
address-family ipv4 unicast
!
interface GigabitEthernet0/3/0/0.2
point-to-point
address-family ipv4 unicast
Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router, Release 5.1.x
85
Implementing MPLS Label Distribution Protocol
Configure IP LDP Fast Reroute Loop Free Alternate: Examples

Cisco CRS Specifications

General

Operating System	Cisco IOS XR
Product Type	Core Router
Form Factor	Modular Chassis
Dimensions	Varies by chassis type
Weight	Varies by chassis type
Architecture	Distributed
Switch Fabric	Multi-stage
Interface Support	Ethernet, SONET/SDH, OTN
Interfaces/Ports	Varies by line card
Port Density	Varies by line card
Routing Protocol	BGP, IS-IS, OSPF, MPLS
Management	CLI, SNMP
Power Supply	Redundant, hot-swappable
Cooling	Redundant, Hot-swappable Fan Trays
Supported Protocols	IPv4, IPv6, MPLS
Management Interfaces	Ethernet, console
Security Features	ACLs