CLI Guide

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
Specify the type of events that trigger an OSPFv3 graceful restart.
Syntax
graceful-restart mode {planned-only | unplanned-only}
To disable graceful restart mode, enter no graceful-restart mode.
Parameters
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.
Defaults OSPFv3 graceful restart supports both planned and unplanned failures.
Command Modes ROUTER OSPFv3
Supported Modes Full—Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.2(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
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.
• An unplanned restart occurs when an unplanned event causes the active RPM
to switch to the backup RPM, such as when an active process crashes, the
active RPM is removed, or a power failure happens. During an unplanned
restart, OSPF sends out a Grace LSA when the backup RPM comes online.
Open Shortest Path First (OSPFv2 and OSPFv3)
1125