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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 IGMP Snooping SSM Mapping Functions

Configuring IGMP Snooping SSM Mapping Functions


  • By configuring Source-Specific Multicast (SSM) mapping, you can set up one-to-one mappings between multicast groups and multicast sources.

  • SSM mapping applies only to the scenario where IGMP snooping in the VLAN can process IGMPv3 messages.

  • Although SSM mapping takes effect only for IGMPv3 messages in a VLAN, the switch does not convert IGMPv2 messages into IGMPv3 messages before sending the messages to router ports. You can configure IGMP snooping proxy or IGMP snooping Report suppression on the switch to enable the switch to send IGMPv3 messages to the upstream device.


  1. Run system-view

    The system view is displayed.

  2. Run vlan vlan-id

    The VLAN view is displayed.

  3. Run igmp snooping version 3

    The version of IGMP snooping run in the VLAN is set to 3.

    The default version number of IGMP snooping is 2, but IGMPv2 version does not support SSM mapping.

  4. Run igmp snooping ssm-mapping enable [ policy policy-name ]

    SSM mapping is enabled in the VLAN.

    By default, SSM mapping is disabled in a VLAN.

  5. Configure the mapping between a group address and a source address.

    Group addresses used in the following steps are included in the SSM group address range. For details on how to configure an SSM group address range, see (Optional) Configuring an SSM Group Policy.

    • If you do not specify policy policy-name in step 4, run the igmp snooping ssm-mapping group-address { group-mask | mask-length } source-address command to configure the mapping between a group address and a source address.
    • If you specify policy policy-name in step 4, perform the following steps:
      1. Run the quit command to return to the system view.
      2. Run the ssm-mapping policy policy-name command to enter the SSM mapping policy view.
      3. Run the group group-address { group-mask-length | group-mask } source source-address command to configure the mapping between a group address and a source address.

    The mapping configured in the SSM mapping policy view can be applied to multiple VLANs, whereas the mapping configured in the VLAN view takes effect only in the current VLAN. To apply the same mapping to multiple VLANs, you are advised to configure an SSM mapping policy.

  6. Run commit

    The configuration is committed.

Updated: 2019-04-20

Document ID: EDOC1100074724

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