The mpls te path verification enable command enables path verification for SR-MPLS TE tunnels. If a label is defective, a device can set the LSP that uses the label to Down.
The undo mpls te path verification enable command disables path verification for SR-MPLS TE tunnels. If a label is defective, a device cannot set the LSP that uses the label to Down.
By default, path verification is disabled for SR-MPLS TE tunnels.
Usage Scenario
SR-MPLS TE cannot detect tunnel status changes by itself. SR-MPLS TE uses the controller or BFD to detect status changes. If neither a controller nor BFD is available, run the mpls te path verification enable command to enable path verification for SR-MPLS TE tunnels. With this function enabled, if a label becomes defective, the device sets the LSP that uses the label in an SR-MPLS TE tunnel to Down, preventing a traffic blackhole caused by a tunnel fault.
If a controller or BFD is configured, run the undo mpls te path verification enable command to disable path verification.Prerequisites
MPLS TE has been enabled globally using the mpls te command.
Precautions
The MPLS view is used for global configuration, whereas the tunnel interface view is for local configuration. The configuration in the tunnel interface view takes percendence over that in the MPLS view. If a configuration in the MPLS view conflicts with that in the tunnel interface view, the configuration in the tunnel interface view takes effect.
Path verification takes effect only on SR-MPLS TE tunnels.