No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.

Configuration Guide - IP Unicast Routing
CloudEngine 12800 and 12800E V200R002C50

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, and PBR.

Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Configuring the OSPF GR Helper

Configuring the OSPF GR Helper

Applicable Environment

Graceful Restart (GR) is a technology used to ensure normal traffic forwarding and non-stop forwarding of key services during the restart of routing protocols. GR is one of high availability (HA) technologies, comprising 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 active/standby switchover and system upgrade.


The CE12800 and CE12800E series switches support only the GR Helper role.

Pre-configuration Tasks

Before configuring OSPF GR, complete the following tasks:


  1. Run system-view

    The system view is displayed.

  2. Run ospf [ process-id ]

    The OSPF view is displayed.

  3. Run opaque-capability enable

    The opaque LSA capability is enabled.

    Opaque LSAs provide the following generic mechanisms for OSPF extension:
    • OSPF uses Type 9 LSAs to support GR.

    • OSPF uses Type 10 LSAs to support TE.

    Therefore, before configuring OSPF GR, you need to enable the opaque LSA capability using the opaque-capability enable command.

  4. Rungraceful-restart [ helper-role { { { { ip-prefix ip-prefix-name | acl-number acl-number | acl-name acl-name } | ignore-external-lsa | planned-only } * } | never } ]

    The GR session parameters are set on the Helper.

    • The ACL parameters and ip-prefix parameters are used to configure a filtering policy so that the local switch can enter the Helper mode only after the neighbor passes the filtering criteria defined in the policy.
    • If the parameter ignore-external-lsa is specified, the Helper does not check AS-external LSAs. By default, the Helper checks AS-external LSAs.
    • If parameter planned-only is specified, the Helper supports only planned GR. By default, the Helper supports both planned GR and unplanned GR.
    • If the parameter never is specified, the switch does not support the Helper mode.

Verifying the Configuration

Run the display ospf [ process-id ] graceful-restart [ verbose ] command to check the OSPF GR status.

Updated: 2019-03-21

Document ID: EDOC1000166601

Views: 294879

Downloads: 168

Average rating:
This Document Applies to these Products

Related Version

Related Documents

Previous Next