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Configuration Guide - MPLS

S7700 and S9700 V200R011C10

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) Blocking Synchronization Between LDP and IS-IS on an Interface

(Optional) Blocking Synchronization Between LDP and IS-IS on an Interface


The ldp-sync enable command run in an IS-IS process enables synchronization between LDP and IS-IS on all local IS-IS interfaces. On an IS-IS interface transmits importance services, LDP and IS-IS synchronization may affect service transmission. If the link is working properly and an LDP session over the link fails, IS-IS sends link state PDUs (LSPs) to advertise the maximum cost of the link. As a result, IS-IS does not select the route for the link, which affects important service transmission.

To prevent the preceding problem, block LDP and IS-IS synchronization on an IS-IS interface that transmits important services.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The IS-IS 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 ldp-sync block

    Synchronization between LDP and IS-IS is blocked on the interface.

    By default, synchronization between LDP and IS-IS is not blocked on an interface.

Updated: 2019-10-18

Document ID: EDOC1000178315

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