After an active/standby switchover starts, an RSVP GR node has an RSVP smoothing period, during which the data plane continues forwarding data if the control plane is not restored. After RSVP smoothing is completed, a restart timer is started.
Restart timer value = Basic time + Number of ingress LSPs x 60 ms + Number of none-ingress LSPs x 15 ms
In this formula, the default basic time is 90 seconds and is configurable by using a command line, and the number of LSPs is the number of LSPs with the local node being the ingress.
After the restart timer expires, the recovery timer is started.
Recovery timer = Restart time + Total number of LSPs x 40 ms
Perform the following configurations on a GR node.