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

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.

Scroll to top