Configuring the OSPFv3 GR Helper

To avoid traffic interruption and route flapping caused by the active/standby switchover, you can enable OSPFv3 GR.

Context

GR ensures normal traffic forwarding and non-stop forwarding of key services during the restart of routing protocols. GR is one of high availability (HA) technologies. HA technologies comprise a set of comprehensive techniques, such as fault-tolerant redundancy, link protection, faulty node recovery, and traffic engineering. As a fault-tolerant redundancy technology, GR is widely used to ensure non-stop forwarding of key services during master/slave main control board switchover and system upgrade.

The NetEngine 8000 F supports only the GR Helper.

Pre-configuration Tasks

Before configuring OSPFv3 GR, complete the following tasks:

Configure a link layer protocol.
Configure IP addresses for interfaces to ensure that neighboring nodes are reachable at the network layer.
Configure basic OSPFv3 functions.

Procedure

Run system-view
The system view is displayed.
Run ospfv3 process-id
The OSPFv3 view is displayed.
Configure a basic ACL:
1. 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 ] ^*
  
  OSPFv3 GR is enabled.
2. Run quit
  
  Return to the system view.
3. Run acl ipv6 { name basic-acl6-name basic | [ number ] basic-acl6-number } [ match-order { config | auto } ]
  
  The basic ACL view is displayed.
4. Run rule [ rule-id ] [ name rule-name ] { deny | permit } [ fragment | source { source-ipv6-address { prefix-length | source-wildcard } | source-ipv6-address/prefix-length | any } | time-range time-name | [ vpn-instance vpn-instance-name | vpn-instance-any ] ] ^*
  
  A rule is configured for the basic ACL.
  
  When the rule command is run to configure rules for a named ACL, only the source address range specified by source and the time period specified by time-range are valid as the rules.
Run commit
The configuration is committed.

Checking the Configurations

Run the following command to check the preceding configuration:

Run the display ospfv3 [ process-id ] graceful-restart-information command to view the OSPFv3 GR Helper status.