Why does the number of received and sent Hello messages remain unchanged in a short period

Run the display mpls ldp interface verbose command to check the interval of the Hello Hold timer after negotiation. The interval of the Hello Hold timer after negotiation is the smaller value between the configurations on the two ends of the LDP session. By default, the interval of the Remote Hello Hold timer is 45s, and the interval of the Link Hello Send timer is one third of that of the Remote Hello Hold timer.

An LSR sends a Hello message at the interval of the Hello Hold timer. The statistics about received and sent Hello messages increase only after an LSR sends or receives a Hello message. Therefore, the statistics on received and sent Hello messages may not increase in a short period.

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