Reason: You can check the negotiated value of the Hello Hold timer by running the display mpls ldp interface verbose command. The value of the negotiated Hello Hold timer is the smaller value between the set Hello Hold timers on both ends of an LDP session. The value of a Hello Send timer is one third of the value of a Hello Hold timer. By default, the Link Hello Hold timer is set to 15s and the Remote Hello Hold timer is set to 45s.

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