Command Line Reference Guide

Open Shortest Path First (OSPFv2 and OSPFv3) | 1079
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.
graceful-restart mode
e
t
Specify the type of events that trigger an OSPFv3 graceful restart.
Syntax
graceful-restart mode [planned-only | unplanned-only]
To disable the configured graceful-restart mode, enter no graceful-restart mode.
Parameters
Defaults
OSPFv3 graceful restart supports both planned and unplanned failures.
Command Modes
ROUTER OSPFv3
Command
History
Usage
Information
OSPFv3 graceful restart supports planned-only and/or unplanned-only restarts. The default is support
for both planned and unplanned restarts.
• A planned restart occurs when you enter the redundancy force-failover rpm command to force
the primary RPM to switch to the backup RPM. During a planned restart, OSPF sends out a
Type-11 Grace LSA before the system switches over to the backup RPM.
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.
planned-only (OPTIONAL) Enter the keywords planned-only to indicate graceful
restart is supported in a planned restart condition only.
unplanned-only (OPTIONAL) Enter the keywords unplanned-only to indicate graceful
restart is supported in an unplanned restart condition only.
Version 8.4.2.2 Introduced on E-Series TeraScale.