Configuring Ip Fast Reroute Loop-Free Alternate - Cisco NCS 6000 Series Configuration Manual

Implementing IS-IS
Command or Action
RP/0/RP0/CPU0:router(config-isis)# address-family
ipv4 unicast
Step 4 metric-style wide [ transition ] [ level { 1 | 2 }]
Example:
RP/0/RP0/CPU0:router(config-isis-af)# metric-style
wide level 1
Step 5 spf prefix-priority [ level { 1 | 2 }] { critical | high |
medium } { access-list-name | tag tag }
Example:
RP/0/RP0/CPU0:router(config-isis-af)# spf
prefix-priority high tag 3
Step 6
commit

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.
Before you begin
Note IPFRR is supported on the Cisco IOS XR. 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 interface-path-id
4. circuit-type { level-1 | level-1-2 | level-2-only }
5. address-family ipv4 unicast
6. ipfrr lfa { level { 1 | 2 }}
7. ipfrr lfa exclude interface type interface-path-id
8. commit
Purpose
Configures a router to generate and accept only wide-link
metrics in the Level 1 area.
Installs all routes tagged with the value 3 first.
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
Configuring IP Fast Reroute Loop-free Alternate
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