Igmp Configuration; Igmp Overview; Igmp Versions; Work Mechanism Of Igmpv1 - H3C S5600 SERIES Operation Manual

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IGMP Configuration

In this manual, the term "router" refers to a router in the generic sense or a Layer 3 Ethernet switch

running an IP multicast protocol.

When configuring IGMP, go to these sections for information you are interested in:

Configuring IGMP

Displaying and Maintaining IGMP

IGMP Overview

As a TCP/IP protocol responsible for IP multicast group member management, the Internet Group

Management Protocol (IGMP) is used by IP hosts to establish and maintain their multicast group

memberships to immediately neighboring multicast routers.

So far, there are three IGMP versions:

IGMPv1 (documented in RFC 1112)

IGMPv2 (documented in RFC 2236)

IGMPv3 (documented in RFC 3376)

All IGMP versions support the any-source multicast (ASM) model. In addition, IGMPv3 provides strong

support to the source-specific multicast (SSM) model.

IGMPv1 manages multicast group memberships mainly based on the query and response mechanism.

Of multiple multicast routers on the same subnet, all the routers can hear IGMP membership report

messages (often referred to as reports) from hosts, but only one router is needed for sending IGMP

query messages (often referred to as queries). So, a querier election mechanism is required to

determine which router will act as the IGMP querier on the subnet.

In IGMPv1, the designated router (DR) elected by a multicast routing protocol (such as PIM) serves as

the IGMP querier.

For more information about a DR, refer to

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