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Configuration procedure
Configuring IS-IS FRR to calculate a backup next hop through LFA calculation
1. Enter system view.
N/A
2. Enter interface view.
interface
interface-type interface-number N/A
3. (Optional.) Disable LFA
calculation on the
interface.
isis 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.
N/A
5. Enter IS-IS IPv4 unicast
address family view.
a isis [ process-id ] [ vpn-instance
vpn-instance-name ]
b address-family ipv4 [ unicast ]
N/A
6. Enable IS-IS FRR to
calculate a backup next
hop through LFA
calculation.
fast-reroute
lfa
By default, IS-IS FRR
is disabled.
Configuring IS-IS FRR using a routing policy
You can use the apply 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 IS-IS FRR. For more information about the apply fast-reroute backup-interface
command and routing policy configurations, see "Configuring routing policies."
To configure IS-IS FRR using a routing policy:
1. Enter system view.
system-view
N/A
2. Enter interface view.
interface-type interface-number N/A
3. (Optional.) Disable LFA
calculation on the
interface.
isis 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.
N/A
5. Enter IS-IS IPv4 unicast
address family view.
a isis [ process-id ] [ vpn-instance
vpn-instance-name ]
b address-family ipv4 [ unicast ]
N/A
6. Enable IS-IS FRR using
a routing policy.
fast-reroute
route-policy
route-policy-name
By default, this feature is
not enabled.
Enabling BFD for IS-IS FRR
By default, IS-IS FRR does not use BFD to detect primary link failures. To speed up IS-IS
convergence, enable BFD for IS-IS FRR to detect primary link failures.
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