User Guide for the Avaya P580 and P882 Multiservice Switches, v6.1 20-1
20 Managing Intelligent

Multicasting

Overview
The following information and procedures provided in this chapter pertain
to layer 2 and layer 3 module configurations:
■Introduction
■Configuring Intelligent Multicast in g
■Managing IGMP Snooping
■Managing the LGMP Server
■Managing the LGMP Client
■Managing CGMP Snooping
For more information about the CLI commands that are mentioned in this
chapter, see Command Reference Guide for the Avaya P580 and P882
Multiservice Switches, Software Version 6.1

Introduction

Intelligent multicasting refers to the forwarding of multicast traffic (pac kets
with a multicast destination MAC add re ss) within a VLAN to a subset of
ports participating in that VLAN. It limits the forwarding of multicast t raffic
to only those ports on the VLAN with clients that want to receive this
multicast traffic.
When disabled, intelligent multicasting floods layer 2 m ulti cast traf f ic to al l
ports on the VLAN on which the traffi c is received.
All traffic that is sent to a particular m ulticast MAC address is said to be in
a multicast session. The switch supports 58 sessions per VLAN. Each
multicast session keeps track of which ports must receive that ses sion’s
multicast traffic within the VLAN. There are two types of ports: client ports
and router ports.
A client port is a port with an attached host conf igured t o recei ve a multi cast
session.