Reference Guide

1068 | Open Shortest Path First (OSPFv2 and OSPFv3)
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Defaults
Disabled
Command Modes
ROUTER OSPFv3
Command
History
Related
Commands
graceful-restart grace-period
e
t
Enable OSPFv3 graceful restart globally by setting the grace period (in seconds) that an OSPFv3
router’s neighbors will continue to advertise the router as adjacent during a graceful restart.
Syntax
graceful-restart grace-period seconds
To disable OSPFv3 graceful restart, enter no graceful-restart grace-period.
Parameters
Defaults
OSPFv3 graceful restart is disabled and functions in a helper-only role.
Command Modes
ROUTER OSPFv3
Command
History
Usage
Information
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 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. In a “restarting-only” role, OSPFv3 does not participate in the graceful restart of a neighbor.
metric-type type-value
(OPTIONAL) Enter the keyword metric-type followed by the OSPFv3
link state type of 1 or 2 for default routes. The values are:
1 = Type 1 external route
2 = Type 2 external route
Default: 2
route-map map-name (OPTIONAL) Enter the keyword route-map followed by the name of an
established route map.
Version 7.8.1.0 Added support for C-Series
Version 7.4.1.0 Introduced
redistribute Redistribute routes from other routing protocols into OSPFv3.
seconds
Time duration, in seconds, that specifies the duration of the restart process
before OSPFv3 terminates the process.
Range: 40 to 1800 seconds
Version 8.4.2.2 Introduced on E-Series TeraScale.