(Optional) Indicates the user-defined GR period.
The default value is the smaller value between twice the update time
and 60 seconds.
The range is from 1 to 1,800. The unit is second.
The GR function is configured on the RIP instances. Different parameters can be configured for
different RIP instances.
The GR period refers to the time from the startup to the end of RIP GR. During this period, the
forwarding table remains unchanged and the RIP route is restored to the state before protocol restart.
When the GR period expires, RIP exits the GR state and performs normal RIP operation.
The graceful-restart grace-period command enables users to modify GR period. Note: Make sure
that GR is completed before the RIP route is validate and after an RIP route update cycle elapses. If
an improper value is configured, non-stop data forwarding cannot be ensured during the GR process.
For example, if the GR period is longer than the time when the neighbor’s route is unavailable and GR
is not completed before the route is validated, then the neighbor is not re-informed of the route and
forwarding of the neighbor’s route is terminated when it is validated, which results in data forwarding
interruption. Therefore, unless otherwise specified, it is not recommended to adjust the GR period. If
the period needs to changed, determine that the grace period is longer than the route update cycle
and shorter than the time when the route is unavailable in combination with the configuration of the
timers basic command.
During the RIP GR period, the network must be stable.
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