What are the functions of LDP Hello messages

An LSR maintains the adjacency relationship with another LSR through received Hello messages. The LSR maintains the Hello Hold timer of the Hello adjacency. Upon receiving a Hello message matching the Hello adjacency, the Hello Hold timer is reset. If the Hello Hold timer expires, the LSR deletes the Hello adjacency. If the LDP session has only one Hello adjacency, the LSR deletes the LDP session.

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