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Configuration Guide - IP Multicast

S7700 and S9700 V200R013C00

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, IPv4 PIM, IPv6 PIM, MSDP, multicast VPN, layer 3 multicast CAC, IPv4 multicast route management, IPv6 multicast route management, IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN replication, layer 2 multicast CAC, multicast network management.
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Configuring IGMP Snooping SSM Mapping in a VLAN

Configuring IGMP Snooping SSM Mapping in a VLAN

Pre-configuration Tasks

Enabling IGMP Snooping


If hosts on a Layer 2 network run only IGMPv1 or IGMPv2, enable Source-Specific Multicast (SSM) mapping on the switch to provide SSM services for these hosts.

Configuration Procedure

Configuring IGMP Snooping SSM Mapping is mandatory.

(Optional) Configuring an SSM Group Policy


By default, Source-Specific Multicast (SSM) group addresses range from to If a user joins a multicast group with an IP address out of this range, configure an SSM group policy in the VLAN to add the group address to the SSM group address range. The SSM group policy must be used together with an ACL. For details on how to configure an ACL, see ACL Configuration in the S7700 and S9700 V200R013C00 Configuration Guide - Security.


By default, the ACL applied to an SSM group policy denies all multicast groups. To exclude specific group addresses from the SSM group address range, use a rule permit source any rule with deny rules in the ACL.


  1. Run system-view

    The system view is displayed.

  2. Run vlan vlan-id

    The VLAN view is displayed.

  3. Run igmp-snooping ssm-policy basic-acl-number

    An SSM group policy is configured.

    After you configure an SSM group policy, the multicast groups specified in the SSM policy are treated as SSM groups.

Configuring IGMP Snooping SSM Mapping


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

  • SSM mapping applies to a VLAN only when the IGMP snooping version running in this VLAN is v3.

  • If inter-VLAN multicast replication is configured, you only need to configure SSM mapping in the multicast VLAN.

  • 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 IGMP snooping version is set to V3 for the VLAN.

    The default IGMP snooping version is V2, but this version does not support SSM mapping.

  4. Run igmp-snooping ssm-mapping enable

    SSM mapping is enabled in the VLAN.

    By default, SSM mapping is disabled in a VLAN.

  5. Run igmp-snooping ssm-mapping group-address { group-mask | mask-length } source-address

    The mapping between a group address and a multicast source address is configured.

    The group address must be in the SSM group address range. To change the SSM group address range, see (Optional) Configuring an SSM Group Policy.

Verifying the IGMP Snooping SSM Mapping Configuration


After configuring SSM mapping, run the following command in any view to check the configured SSM mapping entries.


  • Run the display igmp-snooping port-info [ vlan vlan-id [ group-address group-address ] ] [ verbose ] command to check information about IGMP snooping interfaces.
Updated: 2019-04-08

Document ID: EDOC1100065742

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