Reference Guide

Open Shortest Path First (OSPFv2 and OSPFv3) | 655
Enabling OSPFv2 Graceful Restart
Graceful restart is enabled for the global OSPF process.
For more information, refer to Graceful Restart.
The Dell Networking implementation of OSPFv2 graceful restart enables you to specify:
•
grace period — the length of time the graceful restart process can last before OSPF terminates it.
•
helper-reject neighbors — the router ID of each restart router that does not receive assistance from the
configured router.
•
mode — the situation or situations that trigger a graceful restart.
•
role — the role or roles the configured router can perform.
To enable and configure OSPFv2 graceful restart, use the following commands.
Note: By default, OSPFv2 graceful restart is disabled.
Command Syntax Command Mode Usage
graceful-restart
grace-period
seconds
CONFIG-ROUTEROSPF- id
Enable OSPFv2 graceful-restart globally and set the
grace period.
The seconds range is from 40 and 3000.
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.
graceful-restart
helper-reject
router-id
CONFIG-ROUTEROSPF- id
Enter the Router ID of the OSPFv2 helper router from
which the router does not accept graceful restart
assistance.
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.
graceful-restart
role [helper-only |
restart-only]
CONFIG-ROUTEROSPF- id
By default, OSPFv2 supports both planned and
unplanned restarts. Selecting one or the other mode
restricts OSPFv2 to the single selected mode.
CONFIG-ROUTEROSPF- id Disable OSPFv2 graceful-restart. This command returns
OSPF graceful-restart to its default state.