Configuring GR Helper of the Routing Protocol Between PEs and CEs

You can configure GR Helper of a routing protocol according to the specific routing protocol running between the CE and the PE.

Context

The precautions for configuring GR Helper of different protocols are as follows:

The procedure for configuring the BGP GR Helper function on the PE or CE is the same as that for configuring a common BGP GR Helper function.
By default, a device running IS-IS supports the IS-IS GR Helper function. If IS-IS is running between the PE and CE, you do not need to configure the IS-IS GR Helper function.
The procedure for configuring the OSPF GR Helper function on the CE is the same as that for configuring a common OSPF GR Helper function. For details, see Configuring IGP GR Helper on the Backbone Network. The following describes how to configure the OSPF GR Helper function on the PE.

Procedure

Configure the BGP GR Helper.
1. Run system-view
  The system view is displayed.
2. Run bgp as-number
  The BGP view is displayed.
3. Run graceful-restart
  BGP GR is enabled.
4. Run graceful-restart timer wait-for-rib time
  The period during which the restarting speaker and receiving speaker wait for End-Of-RIB messages is set.
  
  You can adjust parameter values of a BGP GR session as required. Generally, the default values of parameters are recommended.
5. Run commit
  The configuration is committed.
Configure the OSPFv3 GR Helper function on the PE.
1. Run system-view
  The system view is displayed.
2. Run ospfv3 process-id vpn-instance vpnname
  The OSPFv3 multi-instance view is displayed.
3. Run helper-role [ { ip-prefix ip-prefix-name | acl-number acl-number | acl-name acl-name } | max-grace-period period | planned-only | lsa-checking-ignore ] ^*
  The OSPFv3 GR helper function is enabled.
  To specify acl-number acl-number or acl-name acl-name perform the following steps in the system view:
  Run the quit command to return to the system view.
  
  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.
  
  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.
4. Run commit
  The configuration is committed.