Configuring RIPng GR
GR ensures forwarding continuity when a routing protocol restarts or an active/standby switchover occurs.
Two routers are required to complete a GR process. The following are router roles in a GR process:
GR restarter—Graceful restarting router. It must have GR capability.
GR helper—A neighbor of the GR restarter. It helps the GR restarter to complete the GR process.
After RIPng restarts on a router, the router must learn RIPng routes again and updates its FIB table, which causes network disconnections and route reconvergence.
With the GR feature, the restarting router (known as the GR restarter) can notify the event to its GR capable neighbors. GR capable neighbors (known as GR helpers) maintain their adjacencies with the router within a configurable GR interval. During this process, the FIB table of the router does not change. After the restart, the router contacts its neighbors to retrieve its FIB.
By default, a RIPng-enabled device acts as the GR helper. Perform this task on the GR restarter.
![[IMPORTANT: ]](images/important.png) | IMPORTANT: You cannot enable RIPng NSR on a device that acts as GR restarter. | |
To configure GR on the GR restarter:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enable RIPng and enter RIPng view. | ripng [ process-id ] [ vpn-instance vpn-instance-name ] | N/A |
3. Enable the GR capability for RIPng. | graceful-restart | By default, RIPng GR is disabled. |
4. (Optional.) Set the GR interval. | graceful-restart interval interval | By default, the GR interval is 60 seconds. |