Resetting LDP neighbors
You can terminate and re-establish an MPLS LDP neighbor session when at least one LDP Hello adjacency exists with the peer. When the LDP session terminates, the database associated with the LDP session is also cleared.
The LDP sessions are automatically re-established when at least one Hello adjacency exists with the neighbor, and LDP configuration remains unchanged.
When an LDP session is terminated as a result of the reset mpls ldp command, the Ciena device generates a notification message for the neighbor. The other end of the LDP session detects this reset operation and tries to re-establish the session.
When the session re-establishes, the session-specific information is re-learned from its peer:
- LDP downstream and upstream label database displayed by the show mpls ldp downstream and show mpls ldp upstream command
- LDP label switched path displayed by the show mpls ldp lsp command
- LDP peer displayed by the show mpls ldp neighbor command
- LDP FECs learned from the resetting neighbor sessions displayed by the show mpls ldp fec command FECs are not cleared immediately but are marked that no LDP session exists.