By default, an IPv6 IS-IS interface participates in TI-LFA calculation.
Disabling an OSPFv3 interface from participating in TI-LFA calculation
1. Enter system view. system-view
2. Enter the view of OSPFv3 interface. interface interface-type interface-number
3. Disable the interface from participating in TI-LFA calculation. ospfv3 fast-reroute ti-lfa disable [ instance instance-id ]
By default, an OSPFv3 interface participates in TI-LFA calculation.
Configuring FRR microloop avoidance
About this task
FRR microloop avoidance provides microloop avoidance after a network failure.
On a network deployed with TI-LFA FRR, when a node or link fails, traffic will be switched to the backup path calculated by TI-LFA. If a device along the backup path has not finished route convergence, a traffic loop will occur. Traffic will be looped between the device and the source node
(the node prior to the node or link that failed) until the device finishes route convergence.
To resolve this issue, FRR microloop avoidance first switches traffic to the backup path calculated by
TI-LFA after the node or link failure. Then, the source node waits for the nodes on the backup path to finish route convergence before starting route convergence.
Restrictions and guidelines
If you configure both FRR microloop avoidance and SR microloop avoidance, SR microloop avoidance takes effect.
Procedure
1. Enter system view. system-view
2. Enter IS-IS view.
isis process-id
3. Enter IS-IS IPv6 unicast address family view. address-family ipv6
4. Enable FRR microloop avoidance for IS-IS. fast-reroute microloop-avoidance enable [ level-1 | level-2 ]
By default, FRR microloop avoidance is disabled for IS-IS.
5. (Optional.) Set the FRR microloop avoidance RIB-update-delay time. fast-reroute microloop-avoidance rib-update-delay delay-time
[ level-1 | level-2 ]
By default, the FRR microloop avoidance RIB-update-delay time is 5000 ms.
Configuring SR microloop avoidance
About this task
SR microloop avoidance provides microloop avoidance after both a network failure and a failure recovery.
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