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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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Configuring MLD Fast Leave

Configuring MLD Fast Leave


In some scenarios such as ADSL dial-up access, a Multicast Listener Discovery (MLD) querier interface connects to only one receiver host. If the host frequently switches between multiple multicast groups, for example, selecting TV channels, you can configure the fast leave function on the interface so that the interface can quickly respond to Multicast Listener Done messages sent from the host.

After fast leave is configured, the querier does not send a Multicast Address Specific Query message or Multicast Address and Source Specific Query message after receiving a Multicast Listener Done message. Instead, the querier directly notifies the upstream multicast device that the host has left the multicast group. The fast leave function reduces delay in response to Done messages and saves network bandwidth.

To limit the range of multicast groups that member hosts can leave fast, configure an IPv6 access control list (ACL6) to define the range of multicast groups and then reference this ACL6. For details about the ACL6 configuration, see "ACL Configuration" in the Huawei AR Series Access Routers Configuration Guide - Security.


  1. Run:


    The system view is displayed.

  2. Run:

    interface interface-type interface-number

    The interface view is displayed.

  3. Run:

    mld prompt-leave [ group-policy { acl6-number | acl6-name acl6-name } ]

    Fast leave is configured on the interface.

    By default, the router sends Multicast Address Specific Query messages or Multicast Address and Source Specific Query messages after receiving a Done message.


    When configuring an ACL6 rule for the interface, use the permit parameter to allow the hosts connected to the interface to quickly leave multicast groups with addresses in a specified range. If no rule is configured in the ACL6, hosts connected to the interface cannot quickly leave any multicast groups.

Updated: 2019-06-12

Document ID: EDOC1000097181

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