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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.

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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.

NOTE:

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

Pre-configuration Tasks

Before configuring OSPF GR, complete the following tasks:

Procedure

  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.

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Updated: 2019-03-21

Document ID: EDOC1000166601

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