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NE20E-S V800R010C10SPC500 Configuration Guide - MPLS 01

This is NE20E-S V800R010C10SPC500 Configuration Guide - MPLS
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Configuring the IGP Shortcut

Configuring the IGP Shortcut

An IGP shortcut is configured on the ingress of a CR-LSP. The IGP shortcut prevents a route of a CR-LSP from being advertised to neighbors or used by the neighbors.

Context

NOTE:

IGP shortcut and forwarding adjacency cannot be configured simultaneously.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface tunnel tunnel-number

    The view of the MPLS TE tunnel interface is displayed.

  3. Run mpls te igp shortcut [ isis | ospf ] or mpls te igp shortcut isis hold-time interval

    The IGP shortcut is configured.

    hold-time interval specifies the period after which IS-IS responds to the Down status of the TE tunnel.

    If a TE tunnel goes Down and this parameter is not specified, IS-IS recalculates routes. If this parameter is specified, IS-IS responds to the Down status of the TE tunnel after only the specified interval elapses. It either recalculates routes or not depending on the TE tunnel status:
    • If the TE tunnel goes Up, IS-IS does not recalculate routes.
    • If the TE tunnel goes Down, IS-IS still recalculates routes.

  4. Run mpls te igp metric { absolute | relative } value

    The IGP metric of the TE tunnel is configured.

    Either of the following parameters is set when configuring the metric value used by a TE tunnel during IGP shortcut path calculation:

    • If absolute is configured, the TE tunnel metric value is equal to the configured metric value.

    • If relative is configured, the TE tunnel metric value is equal to the sum of the IGP route metric value and relative TE tunnel metric value.

  5. For IS-IS, run isis enable [ process-id ]

    IS-IS is enabled on the tunnel interface.

  6. For OSPF, run the following commands in sequence.

    • Run quit

      The system view is displayed.

    • Run ospf [ process-id ]

      The OSPF view is displayed.

    • Run enable traffic-adjustment

      Traffic adjustment is enabled.

  7. Run commit

    The configuration is committed.

Follow-up Procedure

If a network fault occurs, IGP convergence is triggered. In this case, a transient forwarding status inconsistency may occur among nodes because of their different convergence rates, which poses the risk of microloops. To prevent microloops, perform the following steps:
NOTE:
Before you enable the OSPF TE tunnel anti-microloop function, configure CR-LSP backup parameters.
  • For IS-IS, run the following commands in sequence.
    1. Run system-view

      The system view is displayed.

    2. Run isis [ process-id ]

      An IS-IS process is created, and the IS-IS process view is displayed.

    3. Run avoid-microloop te-tunnel

      The IS-IS TE tunnel anti-microloop function is enabled.

    4. (Optional) Run avoid-microloop te-tunnel rib-update-delay rib-update-delay

      The delay in delivering the IS-IS routes whose outbound interface is a TE tunnel interface is set.

    5. Run commit

      The configuration is committed.

  • For OSPF, run the following commands in sequence.
    1. Run system-view

      The system view is displayed.

    2. Run ospf [ process-id ]

      The OSPF view is displayed.

    3. Run avoid-microloop te-tunnel

      The OSPF TE tunnel anti-microloop function is enabled.

    4. (Optional) Run avoid-microloop te-tunnel rib-update-delay rib-update-delay

      The delay in delivering the OSPF routes whose outbound interface is a TE tunnel interface is set.

    5. Run commit

      The configuration is committed.

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Updated: 2019-01-03

Document ID: EDOC1100055103

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