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graceful-restart grace-period
Enable OSPFv3 graceful restart globally by setting the grace period (in seconds) that an OSPFv3 router’s
neighbors continues to advertise the router as adjacent during a graceful restart.
Z9500
Syntax
graceful-restart grace-period seconds
To disable OSPFv3 graceful restart, enter no graceful-restart grace-
period
.
Parameters
seconds Time duration, in seconds, that specifies the duration of the
restart process before OSPFv3 terminates the process. The
range is from 40 to 1800 seconds.
Defaults OSPFv3 graceful restart is disabled and functions in a helper-only role.
Command
Modes
ROUTER OSPFv3
Command
History
This guide is platform-specific. For command information about other platforms,
refer to the relevant Dell Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.2(1.0) Introduced on the Z9500.
9.1.(0.0) Introduced on the S4810 and Z9000.
8.4.2.2 Introduced on the E-Series TeraScale.
8.3.19.0 Introduced on the S4820T.
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, 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.
1342
Open Shortest Path First (OSPFv2 and OSPFv3)