Reference Guide

Internet Group Management Protocol (IGMP) | 397

Internet Group Management Protocol (IGMP)

Internet Group Management Protocol (IGMP) is supported on S5000 switch.

Multicast is premised on identifying many hosts by a single destination IP address; hosts represented by

the same IP address are a multicast group. Internet Group Management Protocol (IGMP) is a Layer 3

multicast protocol that hosts use to join or leave a multicast group. Multicast routing protocols (such as

PIM) use the information in IGMP messages to discover which groups are active and to populate the

multicast routing table.

This chapter contains the following sections:

• IGMP Implementation Information

• IGMP Protocol Overview

• Configuring IGMP

• Related Configuration Tasks

• Viewing IGMP Enabled Interfaces

• Selecting an IGMP Version

• Viewing IGMP Groups

• Adjusting Timers

• Configuring a Static IGMP Group

• Enabling IGMP Immediate-leave

• IGMP Snooping

• Fast Convergence after MSTP Topology Changes

• Designating a Multicast Router Interface

IGMP Implementation Information

• FTOS supports IGMP versions 1, 2, and 3 based on RFCs 1112, 2236, and 3376, respectively.

• FTOS does not support IGMP version 3 and versions 1 or 2 on the same subnet.

• IGMP on FTOS supports up to 5,095 interfaces on the S5000 and an unlimited number of groups.

• Dell Networking systems cannot serve as an IGMP host or an IGMP version 1 IGMP Querier.

• FTOS automatically enables IGMP on interfaces on which you enable a multicast routing protocol.