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Configuration Guide - IP Unicast Routing

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

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 CloudEngine 8800, 7800, 6800, and 5800 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. Configure GR session parameters on the helper.

    NOTE:
    IETF mode and non-IETF mode are mutually exclusive.
    • Configure GR session parameters on the helper in IETF mode.
      1. Run graceful-restart helper-role ignore-external-lsa

        The helper does not check AS external LSAs.

        By default, the helper checks AS-external LSAs.

      2. Run graceful-restart helper-role planned-only

        The helper is configured to support only planned GR.

        By default, the helper supports both planned GR and unplanned GR.

      3. Choose either of the following configuration as required:

        • Configure a basic ACL rule.

          Run graceful-restart [ helper-role { { acl-number acl-number | acl-name acl-name } * } | never } ]GR session parameters on the helper are configured.

        • Configure an IP prefix list.

          Run graceful-restart [ helper-role { { ip-prefix ip-prefix-name * } | never } ]

          GR session parameters on the helper are configured.

    • Enable GR session on the helper in non-IETF mode.

      Run graceful-restart non-ietf

      GR Helper in non-IETF mode is enabled.

Verifying the Configuration

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

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Updated: 2019-04-20

Document ID: EDOC1100074760

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