H3C S6550X-HI Series Command Reference Manual page 1998

Usage guidelines
GR includes planned GR and unplanned GR.
•
Planned GR—Manually restarts OSPFv3 or performs an active/standby switchover. Before
OSPFv3 restart or active/standby switchover, the GR restarter sends Grace-LSAs to GR
helpers.
•
Unplanned GR—OSPFv3 restarts or an active/standby switchover occurs because of device
failure. Before OSPFv3 restart or active/standby switchover, the GR restarter does not send
Grace-LSAs to GR helpers.
To prevent service interruption after a master/backup switchover, a GR restarter running OSPFv3
must perform the following tasks:
•
Keep the GR restarter forwarding entries stable during reboot.
•
Establish all adjacencies and obtain complete topology information after reboot.
Examples
# Enable the GR capability for OSPFv3 process 1.
<Sysname> system-view
[Sysname] ospfv3 1
[Sysname-ospfv3-1] graceful-restart enable
Related commands
graceful-restart helper enable
graceful-restart helper enable
Use
graceful-restart helper enable
Use
undo graceful-restart helper enable
OSPFv3.
Syntax
graceful-restart helper enable [ planned-only ]
undo graceful-restart helper enable
Default
The GR helper capability for OSPFv3 is enabled.
Views
OSPFv3 view
Predefined user roles
network-admin
Parameters
planned-only
command enables both planned GR and unplanned GR for the GR helper.
Usage guidelines
Upon receiving the Grace-LSA, the neighbors with the GR helper capability enter the helper mode
(and are called GR helpers). Then, the GR restarter retrieves its adjacencies and LSDB with the help
of the GR helpers.
Examples
# Enable the GR helper capability for OSPFv3 process 1.
: Enables only planned GR for the GR helper. If you do not specify this keyword, the
to enable the GR helper capability for OSPFv3.
to disable the GR helper capability for
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