When topology changes occur such as a router failure, LDP generates peer discovery messages that terminate the LDP season to propagate an LSP change.

When an adjacent LSR receives LDP discovery messages. TCP two-way handshake ensures that the LDP session has unidirectional connectivity.

Peer routers establish the LDP session, and the LDP neighbors maintain and terminate the session by exchanging messages

LDP notification messages allow LERs to exchange label information to determine the next hops within a particular LSP.