H3C Technologies H3C S10500 Series Switches - Manual (Page 306)

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Enable the logging of neighbor state changes
Follow these steps to enable the logging of neighbor state changes:
To do… Use the command… Remarks
Enter system view system-view —
Enter OSPFv3 view ospfv3 [ process-id ] —
Enable the logging of neighbor
state changes
log-peer-change
Required
Enabled by default
Configuring OSPFv3 GR
NOTE:
You cannot configure OSPFv3 GR after configuring OSPFv3 virtual links because they are not supported
at the same time.
Graceful Restart ensures the continuity of packet forwarding when a routing protocol restarts or a
master/slave switchover occurs:
• GR Restarter: Graceful restarting router. It must be Graceful Restart capable.
• GR Helper: The neighbor of the GR Restarter. It helps the GR Restarter to complete the GR process.
To prevent service interruption after a master/slave switchover, a GR Restarter running OSPFv3 must
complete the following tasks:
• Keep the GR Restarter forwarding entries stable during reboot
• Establish all adjacencies and obtain complete topology information after reboot
After the master/slave switchover, the GR Restarter sends a Grace-LSA to tell its neighbors that it performs
a GR. Upon receiving the Grace-LSA, the neighbors with the GR Helper capability enter the helper mode
(and are then called “GR Helpers”). Then, the GR Restarter retrieves its adjacencies and LSDB with the
help of the GR Helpers.
Configuring GR Restarter
You can configure the GR Restarter capability on a GR Restarter.
Follow these steps to configure GR Restarter:
To do… Use the command… Remarks
Enter system view system-view —
Enter OSPFv3 view ospfv3 [ process-id ] —
Enable the GR capability graceful-restart enable
Required
Disabled by default.
Configure the GR interval
graceful-restart interval
interval-value Optional
120 seconds by default.