Configuring IGP GR Helper on the Backbone Network

You can configure IGP GR Helper based on the specific IGP running on the backbone network.

Context

By default, a device running IS-IS supports the IS-IS GR Helper function. If IS-IS is running on a backbone network, you do not need to perform this configuration. If OSPF is running on a backbone network, perform the following operations to configure the OSPF GR Helper function.

Procedure

Run system-view
The system view is displayed.
Run ospf [ process-id ]
The OSPF view is displayed.
Run opaque-capability enable
The opaque-LSA capability is enabled. The opaque-LSA capability of OSPF needs to be enabled first because OSPF supports GR through Type 9 LSAs.
Run graceful-restart [ helper-role { { { { ip-prefix ip-prefix-name | acl-number acl-number | acl-name acl-name } | ignore-external-lsa | planned-only } ^* } | never } ]
GR Helper is enabled.

You can use the ignore-external-lsa parameter to configure the GR Helper not to check AS-external LSAs.

You can use the planned-only parameter to configure the GR Helper to support only planned GR.
To specify acl-number acl-number or acl-name acl-name perform the following steps in the system view:
1. Run the quit command to return to the system view.
2. Run the acl { name basic-acl-name { basic | [ basic ] number basic-acl-number } | [ number ] basic-acl-number } [ match-order { config | auto } ] command to enter the ACL view.
3. Run the rule [ rule-id ] [ name rule-name ] { deny | permit } [ fragment-type { fragment | non-fragment | non-subseq | fragment-subseq | fragment-spe-first } | source { source-ip-address { source-wildcard | 0 | src-netmask } | any } | time-range time-name | vpn-instance vpn-instance-name ] ^* command to configure a rule for the ACL.
Run commit
The configuration is committed.