Dell Z9000 Configuration Manual page 572

This setting is the time that an OSPFv2 router's neighbors advertises it as fully adjacent, regardless of
the synchronization state, during a graceful restart. OSPFv2 terminates this process when the grace
period ends.
2. Enter the Router ID of the OSPFv2 helper router from which the router does not accept graceful
restart assistance.
CONFIG-ROUTEROSPF- id mode
graceful-restart helper-reject router-id
• Planned-only — the OSPFv2 router supports graceful-restart for planned restarts only. A planned
restart is when you manually enter a fail-over command to force the primary RPM over to the
secondary RPM. During a planned restart, OSPF sends out a Grace LSA before the system
switches over to the secondary RPM. OSPF also is notified that a planned restart is happening.
• Unplanned-only — the OSPFv2 router supports graceful-restart for only unplanned restarts.
During an unplanned restart, OSPF sends out a Grace LSA after the secondary RPM comes online.
By default, OSPFv2 supports both planned and unplanned restarts. Selecting one or the other mode
restricts OSPFv2 to the single selected mode.
3. Configure the graceful restart role or roles that this OSPFv2 router performs.
CONFIG-ROUTEROSPF- id mode
graceful-restart role [helper-only | restart-only]
Dell Networking OS supports the following options:
• Helper-only: the OSPFv2 router supports graceful-restart only as a helper router.
• Restart-only: the OSPFv2 router supports graceful-restart only during unplanned restarts.
By default, OSPFv2 supports both restarting and helper roles. Selecting one or the other role restricts
OSPFv2 to the single selected role.
To disable OSPFv2 graceful-restart after you have enabled it, use the no graceful-restart grace-
period command in CONFIG-ROUTEROSPF- id mode. The command returns OSPF graceful-restart to
its default state.
NOTE: The Helper mode is enabled by default on the device. To enable the restart mode also on the
device, you must configure the grace period using the graceful-restart grace-period
command. After you enable restart mode the router advertises the neighbor as fully adjacent during
a restart.
For more information about OSPF graceful restart, refer to the Dell Networking OS Command Line
Reference Guide.
Example of the show run ospf Command
When you configure a graceful restart on an OSPFv2 router, the show run ospf command displays
information similar to the following.
Dell#show run ospf
!
router ospf 1
graceful-restart grace-period 300
graceful-restart role helper-only
graceful-restart mode unplanned-only
graceful-restart helper-reject 10.1.1.1
graceful-restart helper-reject 20.1.1.1
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Open Shortest Path First (OSPFv2 and OSPFv3)