Hello,
Thanks for your help. This problem is resovled .
> show backup-selection
Prefix: 0.0.0.0/0
Interface: all
Protection Type: Link, Downstream Paths Only: Disabled, SRLG: Loose, B/w >= Primary: Disabled,
Root-metric: lowest, Dest-metric: lowest
Metric Evaluation Order: Dest-metric, Root-metric
Policy Evaluation Order: Metric