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S12700 V200R011C10 Configuration Guide - VPN

This document describes the VPN configuration procedures and provides configuration examples.
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Configuring IGP GR on the Backbone Network

Configuring IGP GR on the Backbone Network

Context

When configuring GR on the backbone network, configure the corresponding IGP GR (IS-IS GR or OSPF GR) based on the specific IGP protocol running on the backbone network.

Procedure

  • Configure IS-IS GR on the backbone network.

    If IS-IS is running on the public network, do as follows on the related PEs and Ps on the backbone network:

    1. Run system-view

      The system view is displayed.

    2. Run isis process-id

      The IS-IS view is displayed.

    3. Run graceful-restart

      The IS-IS GR capability is enabled.

      By default, the IS-IS GR capability is disabled.

    4. (Optional) Run graceful-restart interval interval-value

      The interval for reestablishing the IS-IS GR session is configured.

      The interval for reestablishing the IS-IS GR session is set to the Hold time in the IS-IS Hello PDU. In this way, the neighbor does not terminate the peer relationship with the switch when the switch performs the AMB/SMB switchover.

      By default, the interval for reestablishing the IS-IS GR session is 300 seconds.

    5. (Optional) Run graceful-restart suppress-sa

      The GR Restarter is configured to suppress the advertisement of the peer relationship when it is restarting.

      The suppress advertisement (SA) bit is used in the Hello PDUs by a restarting switch to request its neighbors to suppress advertising the adjacency to the restarting switch. The SA bit is removed once its database synchronization is over. Enabling this feature avoids the black hole effect caused by sending and receiving LSP during the restart process.

      If the administrator does not want the restarting switch to set the SA bit in its Hello PDUs, the administrator can use the undo graceful-restart suppress-sa command to disable it.

      By default, the SA bit does not take effect.

  • Configure OSPF GR on the backbone network.

    If OSPF is running on the public network, do as follows on the related PEs and Ps on the backbone network:

    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.

    4. Perform the following as required:

      • Run graceful-restart

        The GR capability is enabled for OSPF.

      • Run graceful-restart helper-role { { { ip-prefix ip-prefix-name | acl-number acl-number | acl-name acl-name } | ignore-external-lsa | planned-only } * | never }

        The GR Help capability is enabled for OSPF.

      It is suggested to enable the GR capability for OSPF on all the related PEs and Ps on the backbone network.

      By default, the GR capability for OSPF and the GR Help capability for OSPF are disabled.

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Updated: 2019-04-01

Document ID: EDOC1000178118

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