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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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IGMP Versions

IGMP Versions

Currently, there are three versions of IGMP: IGMPv1, IGMPv2 and IGMPv3.

IGMPv1 defines the group membership query and report processes. IGMPv2 extends IGMPv1 by adding the querier election and member leave mechanisms. IGMPv3 extends IGMPv2 by allowing hosts to specify the multicast sources they do or do not want to receive data from. IGMP versions are backward compatible. This means that a multicast router running a later IGMP version can identify IGMP messages sent from hosts running an earlier IGMP version, even though IGMP messages in different versions are sent using different formats.

All IGMP versions support the any-source multicast (ASM) model. IGMPv3 can be directly applied to the source-specific multicast (SSM) model. IGMPv1 and IGMPv2, however, can be applied to the SSM model only when IGMP SSM mapping is configured. For details about the ASM and SSM models, see Multicast Service Models.

Table 2-1 compares the three IGMP versions.

Table 2-1  Comparison of IGMP versions
Item IGMPv1 IGMPv2 IGMPv3
Querier election Through Protocol Independent Multicast (PIM) Through competition among multicast routers on a local network segment Through competition among multicast routers on a local network segment
General Query message Supported Supported Supported
Report message Supported Supported Supported
Group-Specific Query message Not supported Supported Supported
Leave message Not supported Supported No specific Leave message is defined. Instead, group members send a specified type of Report message to notify multicast routers that they are leaving a group.
Group-and-Source-Specific Query message Not supported Not supported Supported
Specifying multicast source in Report messages Not supported Not supported Supported
Protocol message versions supported IGMPv1 IGMPv1, IGMPv2 IGMPv1, IGMPv2, IGMPv3
ASM model Supported Supported Supported
SSM model IGMP SSM mapping required IGMP SSM mapping required Supported
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Updated: 2019-06-12

Document ID: EDOC1000097181

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