Allied Telesis AR400 manual Introduction, Contents, AlliedWare OS

AlliedWare™ OS

How To Configure IGMP for Multicasting on Routers and Managed Layer 3 Switches

Introduction

Allied Telesis routers and managed layer 3 switches use IGMP—Internet Group Management Protocol—to track which multicast groups their clients belong to. This enables them to send the correct multimedia streams to the correct destination.

This How To Note describes basic and advanced IGMP configuration, in the following major sections:

zan overview of IGMP and definitions of some of the IGMP terminology

zexamples and discussion of the most common IGMP functionality—IGMP snooping, IGMP Querier behaviour and selection, and IGMP proxy

zexamples and discussion of the advanced functionality available through AlliedWare’s feature-rich IGMP implementation

zinformation for debugging

zinformation about the STP state of the simple three-switch ring used in most examples

Contents
Introduction	1
Products and software versions this note applies to	3
IGMP overview	5
Queriers and Snoopers	5
Messages	6
Choosing group addresses	7
IGMP snooping	9
Example	9
Explanation of IGMP snooping	11

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