The GR function is configured based on RIPng instances. Different parameters can be configured for
different RIPng instances as required.
The GR period indicates the maximum duration from RIPng restart to RIPng GR completion. In this time
period, the forwarding table before restart is used and the RIPng route is restored to the status before
restart. After the GR period expires, the RIPng process exits the GR status and the common RIPng
operation is performed.
The graceful-restart grace-period command allows a user to modify the GR period in explicit mode. Note
that GR is completed and the RIPng route is updated once before the RIPng route becomes invalid. If the
GR period is improperly set, continuous data forwarding in the GR process cannot be ensured. A typical
case is as follows:
If the GR period is greater than the invalid time of the neighbor route, GR is not completed before the route
becomes invalid and the route is not advertised to the neighbor again. The neighbor route stops forwarding
data after the route becomes invalid, resulting in data forwarding interruption. Therefore, unless otherwise
specified, it is not recommended to adjust the GR period. If the GR period needs to be configured, check
configuration of the timers command to ensure that the GR period value is greater than the route update
time and smaller than the route invalid time.
When GR is performed for the RIPng process, ensure that the network environment is stable.
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