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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) Configuring Delayed Transmission of Label Withdraw Messages

(Optional) Configuring Delayed Transmission of Label Withdraw Messages


An LSP on a local node flaps because an LDP session between the node and its downstream peer flaps, a route flaps, or an LDP policy is modified. The local node repeatedly sends Label Withdraw and Label Mapping messages in sequence to upstream nodes. This causes the upstream nodes to repeatedly tear down and reestablish LSPs. As a result, the entire LDP LSP flaps. The label withdraw delay function prevents the entire LDP LSP from flapping.

Perform the following steps on each node of an LDP LSP:


  1. Run system-view

    The system view is displayed.

  2. Run mpls ldp

    The MPLS-LDP view is displayed.

  3. Run label-withdraw-delay

    The label withdraw delay function is enabled.

    By default, the label withdraw delay function is disabled.

  4. Run label-withdraw-delay timer time

    The delay time for a Label Withdraw message to be sent is set.

    The default delay time is 5 seconds.

Updated: 2019-10-18

Document ID: EDOC1000178315

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