CLI Guide

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
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
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.
By default, both planned and unplanned restarts trigger an OSPFv3 graceful restart. Selecting one or the
other mode restricts OSPFv3 to the single selected mode.
Open Shortest Path First (OSPFv2 and OSPFv3) 1105