H3C Technologies H3C S7500E Series Switches - Manual (Page 310)

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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
You cannot configure OSPFv3 GR after configuring OSPFv3 virtual links, because they are not
supported at the same time.
To prevent service interruption after a master/backup switchover, a GR Restarter running OSPFv3
must complete the following tasks:
z Keep the GR Restarter forwarding entries stable during reboot.
z Establish all adjacencies and obtain complete topology information after reboot.
After the master/backup 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 thus called GR Helpers). Then, the GR Restarter retrieves its adjacencies and
LSDB with the help of the GR Helpers. Thus, the normal data forwarding is ensured.
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.