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Configuration Guide - MPLS

S7700 and S9700 V200R010C00

This document describes MPLS configurations supported by the switch, including the principle and configuration procedures of static LSPs, MPLS LDP, MPLS TE, MPLS QoS, MPLS OAM, Seamless MPLS, and MPLS common features, and provides configuration examples.
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(Optional) Setting the Hold-down Timer Value

(Optional) Setting the Hold-down Timer Value

Context

On a device that has LDP-IGP synchronization enabled, if the active physical link recovers, an IGP enters the Hold-down state, and a Hold-down timer starts. Before the Hold-down timer expires, the IGP delays establishing an IGP neighbor relationship until an LDP session is established over the active link so that the LDP session over and IGP route for the active link can become available simultaneously.

NOTE:

If IS-IS is used, you can set the value of the Hold-down timer on a specified interface or set the value of the Hold-down timer for all IS-IS interfaces in the IS-IS view.

If different Hold-down values on an interface and in an IS-IS process are set, the setting on the interface takes effect.

Procedure

  • If OSPF is used as an IGP, perform the following steps:
    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      interface interface-type interface-number

      The interface view is displayed.

    3. (Optional) On an Ethernet interface, run undo portswitch

      The interface is switched to Layer 3 mode.

      By default, an Ethernet interface works in Layer 2 mode.

    4. Run:

      ospf timer ldp-sync hold-down value

      The interval during which OSPF waits for an LDP session to be established is set.

      By default, the Hold-down timer value is 10 seconds.

  • If IS-IS is used as an IGP, perform the following steps:

    Set the Hold-down timer on a specified IS-IS interface.

    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      interface interface-type interface-number

      The interface view is displayed.

    3. (Optional) On an Ethernet interface, run undo portswitch

      The interface is switched to Layer 3 mode.

      By default, an Ethernet interface works in Layer 2 mode.

    4. Run:

      isis timer ldp-sync hold-down value

      The interval during which IS-IS waits for an LDP session to be established is set.

      By default, the Hold-down timer value is 10 seconds.

    Set the Hold-down timer on all IS-IS interfaces in a specified IS-IS process.

    1. Run:

      system-view

      The system view is displayed.

    2. Run:

      isis [ process-id ]

      The IS-IS process view is displayed.

    3. Run:

      timer ldp-sync hold-down value

      The Hold-down timer is set, which enables all IS-IS interfaces within an IS-IS process to delay establishing IS-IS neighbor relationships until LDP sessions are established.

      By default, the Hold-down timer value is 10 seconds.

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Updated: 2019-04-18

Document ID: EDOC1000141902

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