What are the functions of LDP KeepAlive messages

An LSR maintains the LDP session with another LSR based on the received KeepAlive messages. The LSR maintains the KeepAlive Hold timer of the LDP session. Upon receiving a KeepAlive message matching the LDP session, the KeepAlive Hold timer is reset. If the KeepAlive Hold timer expires, the LSR deletes the LDP session.

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