graceful-restart (OSPF view)

Use graceful-restart to enable OSPF GR.

Use undo graceful-restart to disable OSPF GR.

Syntax

graceful-restart [ ietf | nonstandard ] [ global | planned-only ] *

undo graceful-restart

Default

OSPF GR is disabled.

Views

OSPF view

Predefined user roles

network-admin

Parameters

ietf: Enables IETF GR.

nonstandard: Enables non-IETF GR.

global: Enables global GR. In global GR mode, a GR process can be completed only when all GR helpers exist. A GR process fails if a GR helper fails (for example, the interface connected to the GR helper goes down). If you do not specify this keyword, the command enables partial GR. In partial GR mode, a GR process can be completed if a GR helper exists.

planned-only: Enables only planned GR. If you do not specify this keyword, the command enables both planned GR and unplanned GR.

Usage guidelines

GR includes planned GR and unplanned GR.

• Planned GR—Manually restarts OSPF by using the reset ospf process command or performs an active/standby process switchover by using the placement reoptimize command. Before OSPF restart or active/standby switchover, the GR restarter sends Grace-LSAs to GR helpers.

• Unplanned GR—OSPF restarts or an active/standby switchover occurs because of device failure. Before OSPF restart or active/standby switchover, the GR restarter does not send Grace-LSAs to GR helpers.

Before enabling IETF GR for OSPF, enable Opaque LSA advertisement and reception with the opaque-capability enable command.

Before enabling non-IETF GR for OSPF, enable OSPF LLS with the enable link-local-signaling command and OOB-Resynch with the enable out-of-band-resynchronization command.

If you do not specify the nonstandard or ietf keyword, this command enables non-IETF GR for OSPF.

OSPF GR and OSPF NSR are mutually exclusive. Do not configure the graceful-restart command and the non-stop-routing command at the same time.

Examples

# Enable IETF GR for OSPF process 1.

<Sysname> system-view
[Sysname] ospf 1
[Sysname-ospf-1] opaque-capability enable
[Sysname-ospf-1] graceful-restart ietf

# Enable non-IETF GR for OSPF process 1.

<Sysname> system-view
[Sysname] ospf 1
[Sysname-ospf-1] enable link-local-signaling
[Sysname-ospf-1] enable out-of-band-resynchronization
[Sysname-ospf-1] graceful-restart nonstandard

Related commands

enable link-local-signaling

enable out-of-band-resynchronization

opaque-capability enable