The graceful-restart command configures a device as a GR helper.
The undo graceful-restart command cancels the configuration.
By default, the device does not function as a GR helper.
graceful-restart [ helper-role { { { ip-prefix ip-prefix-name | acl-number acl-number | acl-name acl-name } | ignore-external-lsa | planned-only } * } ]
graceful-restart helper-role never
graceful-restart non-ietf
undo graceful-restart [ helper-role [ { { ip-prefix [ ip-prefix-name ] | acl-number [ acl-number ] | acl-name [ acl-name ] } | ignore-external-lsa | planned-only } * ] ]
undo graceful-restart helper-role never
undo graceful-restart non-ietf
| Parameter | Description | Value |
|---|---|---|
| helper-role |
Indicates the GR Helper mode. |
- |
| ip-prefix ip-prefix-name |
Specifies the name of an IP prefix list. |
The name is a string of 1 to 169 case-sensitive characters except spaces. When double quotation marks are used to include the string, spaces are allowed in the string. |
| acl-number acl-number |
Specifies the basic ACL number. |
The value is an integer ranging from 2000 to 2999. |
| acl-name acl-name |
Specifies the name of a named basic ACL. |
The value is a string of 1 to 64 case-sensitive characters starting with a letter. It cannot contain spaces. |
| ignore-external-lsa |
Prevents the device from checking Type 5 and Type 7 LSAs. |
- |
| planned-only |
Indicates that the device supports only planned GR. |
By default, the device supports both planned GR and unplanned GR. |
| never |
Indicates that the router does not support the Helper mode. |
- |
| non-ietf |
Enables the non-IETF mode. |
- |
Usage Scenario
After an OSPF process is restarted through GR, the restarter and the helper reestablish the neighbor relationship, exchange routing information, synchronize LSDBs, and update routing tables and FIBs to ensure network stability.
Prerequisites
The Opaque-LSA capability has been enabled using the opaque-capability enable command.
Precautions
The graceful-restart non-ietf and graceful-restart [ helper-role { { { { ip-prefix | acl-number | acl-name } | ignore-external-lsa | planned-only } * } | never } ] commands are mutually exclusive.
If the GR restarter fails to complete GR within 1800s, the GR helper in non-IETF mode exits the helper mode. In non-IETF mode, only broadcast interfaces can be simulated as P2P interfaces.