On a unidirectional LSP, creating a BFD session on the active role (ingress node) triggers the sending of LSP ping request messages to the passive role (egress node). Only after the passive role receives the ping packets, a BFD session can be automatically set up.
Perform the following configurations on the egress node of an MPLS TE tunnel.
The system view is displayed.
The BFD view is displayed.
The capability of passively creating BFD sessions is enabled.
After this command is run, a BFD session can be created only after the egress receives an LSP Ping request containing a BFD TLV from the ingress.