Open Shortest Path First (OSPFv2 and OSPFv3) | 731
Enable OSPFv3 graceful restart
Graceful Restart for OSPFv3 is supported only on platform e
t
. Refer to Graceful Restart on page 700
for more information on the feature.
By default, OSPFv3 graceful restart is disabled and functions only in a helper role to help restarting
neighbor routers in their graceful restarts when it receives a Grace LSA.
To enable OSPFv3 graceful restart, you must enter the
ipv6 router ospf process-id command to enter
OSPFv3 configuration mode and then configure a grace period using the
graceful-restart grace-period
command. The grace period is the length of time that OSPFv3 neighbors continue to advertise the
restarting router as though it is fully adjacent. When graceful restart is enabled (restarting role), an OSPFv3
restarting expects its OSPFv3 neighbors to help when it restarts by not advertising the broken link.
When you enable the helper-reject role on an interface with the
ipv6 ospf graceful-restart helper-reject
command, you reconfigure OSPFv3 graceful restart to function in a “restarting-only” role. OSPFv3 does
not participate in the graceful restart of a neighbor. (Note that you enter the
ipv6 ospf graceful-restart
helper-reject
command in Interface configuration mode.)
To disable OSPFv3 graceful restart when it is enabled, enter the following command:
Command Syntax Command Mode Usage
graceful-restart
grace-period
seconds
CONF-IPV6-ROUTE
R-OSPF
Enable OSPFv3 graceful restart globally by setting the grace
period (in seconds). Valid values are from 40 to 1800 seconds.
ipv6 ospf graceful-restart
helper-reject
INTERFACE Configure an OSPFv3 interface to not act upon the Grace LSAs
that it receives from a restarting OSPFv3 neighbor.
graceful-restart mode
[planned-only |
unplanned-only]
CONF-IPV6-ROUTE
R-OSPF
Specify the operating mode and type of events that trigger a
graceful restart:
• Planned-only. The OSPFv3 router supports graceful restart
only for planned restarts. A planned restart is when you
manually enter a redundancy force-failover rpm command to
force the primary RPM over to the secondary RPM. During a
planned restart, OSPFv3 sends out a Grace LSA before the
system switches over to the secondary RPM. OSPFv3 is
notified that a planned restart is happening.
• Unplanned-only. The OSPFv3 router supports graceful-restart
only for unplanned restarts. During an unplanned restart,
OSPFv3 sends out a Grace LSA once the secondary RPM
comes online.
Default: Both planned and unplanned restarts trigger an OSPFv3
graceful restart. Selecting one or the other mode restricts OSPFv3
to the single selected mode.
Command Syntax Command Mode Usage
no graceful-restart grace-period
CONF-IPV6-ROUTE
R-OSPF
Disable OSPFv3 graceful-restart.
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