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

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Run the display mpls ldp session verbose command to check the interval of the KeepAlive Hold timer after negotiation. The interval of the KeepAlive 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 KeepAlive Hold timer is 45s, and the interval of the KeepAlive Send timer is one third of that of the KeepAlive Hold timer.

After an LDP session is established, the LSRs on the two ends of the LDP session start the KeepAlive Send timer and periodically send KeepAlive messages to maintain the LDP session. An LSR sends a KeepAlive message at the interval of the KeepAlive Send timer. The peer end receives the KeepAlive message when the link is normal. The statistics about received and sent KeepAlive messages increase. Therefore, the statistics about received and sent KeepAlive messages may not increase in a short period.

Other related questions:
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.

Why are statistics on received and sent Hello messages both 0
Run the display mpls ldp interface command to check the interface status. The command output is displayed as follows: display mpls ldp interface LDP Interface Information in Public Network Codes:LAM(Label Advertisement Mode), IFName(Interface name) A '*' before an interface means the entity is being deleted. ------------------------------------------------------------------------------ IFName Status LAM TransportAddress HelloSent/Rcv ------------------------------------------------------------------------------ Vlanif10 Active DU 1.1.1.1 29574/29539 ------------------------------------------------------------------------------ In normal cases, the interface status is Active. If the interface status is Inactive, the interface cannot receive or send Hello messages. In most cases, the interface status is Inactive because the interface is shut down or no IP address is configured for the interface.

How to check the statistics on received and sent Hello messages
Run the display mpls ldp interface command to check the statistics on received and sent Hello messages on an interface. The command output is displayed as follows: display mpls ldp interface LDP Interface Information in Public Network Codes:LAM(Label Advertisement Mode), IFName(Interface name) A '*' before an interface means the entity is being deleted. ------------------------------------------------------------------------------ IFName Status LAM TransportAddress HelloSent/Rcv ------------------------------------------------------------------------------ Vlanif10 Active DU 1.1.1.1 29574/29539 ------------------------------------------------------------------------------ The value of the field HelloSent/Rcv indicates the statistics on received and sent Hello messages

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