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• Enable IPv6 IS-IS.

• Make sure the backup next hop is reachable.

Configuration procedure

Configuring IPv6 IS-IS FRR to calculate a backup next hop through LFA calculation

Step

Command

Remarks

1. Enter system view.

system-view

N/A

2. Enter interface view.

interface

interface-type

interface-number

N/A

3. (Optional.) Disable LFA

calculation on the interface.

isis ipv6 fast-reroute lfa-backup

exclude

By default, the interface

participates in LFA calculation

and can be elected as a backup

interface.

4. Return to system view.

quit

N/A

5. Enter IS-IS IPv6 unicast

address family view.

isis

[ process-id ] [

vpn-instance

vpn-instance-name ]

address-family ipv6

[

unicast

]

N/A

6. Enable IPv6 IS-IS FRR to

calculate a backup next

hop through LFA

calculation.

fast-reroute lfa

By default, IPv6 IS-IS FRR is

disabled.

Configuring IPv6 IS-IS FRR using a routing policy

You can use the apply ipv6 fast-reroute backup-interface command to specify a backup next hop

in a routing policy for routes matching specific criteria. You can also perform this task to reference the

routing policy for IPv6 IS-IS FRR. For more information about the apply ipv6 fast-reroute

backup-interface command and routing policy configurations, see "Configuring routing policies."

To configure IPv6 IS-IS FRR using a routing policy: