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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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(Optional) Configuring the Router-Alert Option

(Optional) Configuring the Router-Alert Option


By default, the router does not check whether Multicast Listener Discovery (MLD) packets contain the Router-Alert option and sends all the MLD packets to the upper-layer routing protocol. Checking the Router-Alert option can improve system performance, reduce route costs, and increase network security. When the received MLD packets do not contain the Router-Alert option, the router discards the packets.

By default, the router sends MLD packets with the Router-Alert option.


  1. Run:


    The system view is displayed.

  2. Run:

    vlan vlan-id

    The VLAN view is displayed.

  3. Run:

    mld-snooping require-router-alert

    The router is configured to check the Router-Alert option in MLD packets.

  4. Run:

    mld-snooping send-router-alert

    The Router-Alert option is added to the MLD packets sent by the router.

Updated: 2019-06-12

Document ID: EDOC1000097181

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