Administrator Guide

Attached Router: 20.20.20.5
DellEMC#
Related
Commands
• show ip ospf database — display OSPF database information.
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.
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, see the relevant Dell EMC
Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.10(0.0) Introduced on the S6100-ON.
9.8(2.0) Introduced on the S3100 series.
9.8(1.0) Introduced on the Z9100-ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
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.
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.
Open Shortest Path First (OSPFv2 and OSPFv3) 1125