IGMP/MLD Feature Overview and Configuration Guide

Allied Telesis routers and managed Layer 3 switches use IGMP (Internet Group Management Protocol) and MLD (Multicast Listener Discovery) to track which multicast groups their clients belong to. This enables them to send the correct multimedia streams to the correct destinations. IGMP is used for IPv4 multicasting, and MLD is used for IPv6 multicasting.

This guide describes basic and advanced IGMP and MLD configuration, in the following major sections:

  • an overview of IGMP/MLD and definitions of some of the IGMP/MLD terminology
  • examples and discussion of the most common IGMP functionality—IGMP/MLD snooping, IGMP/MLD Querier behaviour and selection, and IGMP/MLD proxy
  • examples and discussion of the advanced functionality available through the feature rich IGMP/MLD implementation in AlliedWare Plus
  • information for debugging
  • information about the STP state of the simple three-switch ring used in most examples
  • information about IGMPv3/MLDv2

AlliedWare Plus