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CLI-based Configuration Guide - IP Multicast

AR500, AR510, AR531, AR550, AR1500, and AR2500 V200R010

This document describes the concepts and configuration procedures of IP Service features on the device, and provides the configuration examples.
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Configuring MLD SSM Mapping

Configuring MLD SSM Mapping

Pre-configuration Tasks

Enabling MLD


The source-specific multicast (SSM) model allows MLDv2 hosts to specify the multicast sources from which they want to receive data. However, some hosts can only run MLDv1. To allow these hosts to use SSM, configure MLD SSM mapping on the industrial switch router. MLD SSM mapping is implemented based on static SSM mapping entries on the industrial switch router. The industrial switch router converts (*, G) information in MLDv1 Multicast Listener Report messages to (S, G) information according to static SSM mapping entries to provide the SSM service for MLDv1 hosts. By default, the range of IPv6 SSM group addresses is FF3x::/32, in which x cannot be 1 or 2. You can expand the range of IPv6 SSM group addresses. For the configuration, see (Optional) Configuring an SSM Group Policy.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run mld ssm-mapping enable

    SSM mapping is enabled on the interface.

    To ensure that hosts running any MLD version on a network segment can obtain SSM services, it is recommended that you enable MLDv2 on industrial switch router interfaces.

  4. Run quit

    Return to the system view.

  5. Run mld

    The MLD view is displayed.

  6. Run ssm-mapping ipv6-group-address ipv6-group-mask-length ipv6-source-address

    One or more multicast group addresses are mapped to a multicast source address.

Verifying the Configuration

After configuring MLD SSM mapping on an interface, run the following commands in any view to check the configured mapping entries and whether MLD SSM mapping is enabled on the interface.

  • Run the display mld interface [ interface-type interface-number | up | down ] [ verbose ] command to check the MLD information on an interface.
  • Run the display mld group [ ipv6-group-address | interface interface-type interface-number ]* ssm-mapping [ verbose ] command to check information about multicast group entries established with MLD SSM mapping.
  • Run the display mld ssm-mapping { group [ ipv6-group-address ] | interface [ interface-type interface-number ] } command to check the configuration of MLD SSM mapping.
Updated: 2019-08-09

Document ID: EDOC1100034230

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