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router does not become fully adjacent with the helper router before the grace period
expires, the helper abandons the helper role and determines its adjacency with the
restarting router to be down. Also, based on your configuration, the helper can
abandon a restart if it detects a topology change before the restart is complete.
After the router restarts, the restarting router purges the grace LSA from the OSPF
domain.
To configure the router as a graceful restart helper, use the graceful restart helper
commands. These commands include graceful-restart helper and graceful-restart
helper-abort-topology-change.
To configure the router for a restart scenario, use the graceful restart commands.
These commands include graceful-restart, graceful-restart notify-time, and
graceful-restart restart-time.
NOTE: We recommend that you always enable stateful SRP switchover on routers
that you have configured with OSPF graceful restart not doing so renders OSPF
graceful restart configuration ineffective.
NOTE: Graceful restart mode and the OSPF graceful restart helper mode are supported
for both OSPFv2 and OSPFv3 routers.
graceful-restart
graceful-restart helper
graceful-restart helper-abort-topology-change
Use to enable OSPF graceful restart on the OSPFv2 or OSPFv3 router.
Example
host1(config-router)#graceful-restart
Use the no version to disable OSPF graceful restart capability on the router.
See graceful-restart
Use to configure the OSPFv2 or OSPFv3 router to function as an OSPF graceful
restart helper router.
Example
host1(config-router)#graceful-restart helper
Use the no version to disable OSPF graceful restart helper mode capability on
the router.
See graceful-restart helper
Chapter 5: Configuring OSPF
Configuring OSPF Graceful Restart
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