Defaults OSPFv3 graceful restart is disabled and functions in a helper-only role.Command Modes ROUTER OSPFv3Command History This guide is platform-specific. For command information about other platforms, referto 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 Description9.9(0.0) Introduced on the C9010.9.2(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 tohelp 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 enterOSPFv3 configuration mode and then configure a grace period using the graceful-restart grace-period command. The grace period is the length of time that OSPFv3neighbors continue to advertise the restarting router as though it is fully adjacent.When graceful restart is enabled (restarting role), an OSPFv3 restarting expects itsOSPFv3 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 ina “restarting-only” role. In a “restarting-only” role, OSPFv3 does not participate in thegraceful restart of a neighbor.graceful-restart modeSpecify the type of events that trigger an OSPFv3 graceful restart.C9000 SeriesSyntax 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 indicategraceful restart is supported in a planned restart condition only.Open Shortest Path First (OSPFv2 and OSPFv3) 1578
