Alcatel-Lucent 6850-48 ネットワークガイド

IPMS Overview

Configuring IP Multicast Switching

page 42-6

OmniSwitch AOS Release 6 Network Configuration Guide

A multicast group is defined by a multicast group address, which is a Class D IP address in the range 
224.0.0.0 to 239.255.255.255. (Addresses in the range 239.0.0.0 to 239.255.255.255 are reserved for 
boundaries.) The multicast group address is indicated in the destination address field of the IP header. (See 

 for more information.)

IPMS tracks the source VLAN on which the Internet Group Management Protocol (IGMP) requests are 
received. The network interfaces verify that a multicast packet is received by the switch on the source (or 
expected) port.

The figure on the following page shows an IPMS network where video content can be provided to clients 
that request it. A server is attached to the switch that provides the source (i.e, multicast) IP addresses. 
Clients from two different attached networks send IGMP reports to the switch to receive the video content.

(source IP address)

(destination IP address)

Ports on end stations send 
IGMP requests to receive 
multicast traffic.

(dynamically built)