Graceful-Restart Mode - Dell S4810 Reference Manual

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ROUTER OSPFv3

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 9.1.

Version 8.4.2.2

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

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.

graceful-restart mode

Specify the type of events that trigger an OSPFv3 graceful restart.

graceful-restart mode {planned-only | unplanned-only}

To disable graceful restart mode, enter no graceful-restart mode.

planned-only

OSPFv3 graceful restart supports both planned and unplanned failures.

Open Shortest Path First (OSPFv2 and OSPFv3)

Introduced on the S4810 and Z9000.

Introduced on the E-Series TeraScale.

Introduced on the S4820T.

(OPTIONAL) Enter the keywords planned-only to indicate

graceful restart is supported in a planned restart condition

(OPTIONAL) Enter the keywords unplanned-only to

indicate graceful restart is supported in an unplanned restart

condition only.