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Configuration Guide - IP Multicast

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.

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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 switch. MLD SSM mapping is implemented based on static SSM mapping entries on the switch. The switch 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. On an Ethernet interface, run undo portswitch

    The interface is switched to Layer 3 mode.

    By default, an Ethernet interface works in Layer 2 mode.

    The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.

    If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

  4. 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 switch interfaces.

  5. Run quit

    Return to the system view.

  6. Run mld

    The MLD view is displayed.

  7. 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.

  8. Run commit

    The configuration is committed.

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: 2020-01-09

Document ID: EDOC1100074724

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