Administrator 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.
C9000 Series
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, 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 Description
9.9(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
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.
ipv6 neighbor
Configure a static entry in the IPv6 neighbor discovery.
C9000 Series
Syntax
ipv6 neighbor{ipv6-address} {interface interface} {hardware_address}[vrf vrf-
name]
To remove a static IPv6 entry from the IPv6 neighbor discovery, use the no ipv6 neighboripv6–
address{interface interface
Open Shortest Path First (OSPFv2 and OSPFv3) 1181