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CLI-based Configuration Guide - IP Multicast

AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R007

This document describes the principles and configurations of IP multicast, and provides configuration examples.
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Sending Query Messages Upon Network Topology Change

Sending Query Messages Upon Network Topology Change


When Layer 2 network topology changes, the forwarding path of multicast packets may change. After the router is configured to send Multicast Listener Discovery (MLD) Query messages when the link fails, the router updates information about group member ports according to the MLD Report messages replied by group members. In this way, multicast traffic can be quickly switched to new forwarding paths.


  1. Run:


    The system view is displayed.

  2. Run:

    mld-snooping send-query enable

    The router is configured to send MLD General Query messages when network topology changes.

    By default, the router does not send MLD General Query messages when network typology changes.

    This configuration enables the router to detect the Layer 2 network topology change and send MLD General Query messages. This ensures that the router can promptly update the interface information and the multicast data received by multicast group members is not interrupted.

  3. (Optional) Run:

    mld-snooping send-query source-address ipv6-address

    The source IPv6 address of the MLD General Query message is configured.

    By default, the source IPv6 address of the MLD General Query message is a link local address, that is, an IPv6 address starting with FE80::. If this address has been used by another device on the network, run this command to change the source IP address of an MLD General Query message.

Updated: 2019-06-12

Document ID: EDOC1000097181

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