Enabling mLDP P2MP FRR Link Protection

Procedure

1. Run system-view

   The system view is displayed.

2. Run mpls ldp

   The MPLS-LDP view is displayed.

3. Run mldp p2mp

   mLDP P2MP is enabled globally.

4. Run mldp p2mp frr link-protection

   mLDP P2MP FRR link protection is enabled.

   

   When mLDP FRR link protection is enabled and a link fault is being rectified, a delayed switchback is required. During the delayed switchback, the backup path remains unchanged. When the link recovers, IGP route convergence is fast, causing mLDP to recalculate a new backup path. During path calculation, the old backup path is deleted. To prevent packet loss stemming from the deletion of the old backup path, set the time used to keep advertising the maximum IGP cost to be longer than the mLDP FRR delay. To prevent this problem, run the mpls p2mp frr-wtr command to set an mLDP FRR delay.

5. Run commit

   The configuration is committed.