ZyXEL Communications XGS-4528F - Manual (Page 243)

XGS-4528F User’s Guide
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29
IGMP
This chapter shows you how to configure the Switch as a multicast router. See also Section
22.4 on page 177 for information on IGMP snooping.
29.1 IGMP Overview
IP multicast is an IETF standard for distributing data to multiple recipients. The following
figure shows a multicast session and the relationship between a multicast server, multicast
routers and multicast hosts. A multicast server transmits multicast packets and multicast
routers forward multicast packets to multicast hosts.
Figure 127 IP Multicast
A host can decide to join or leave a multicast group at any time. A host can also be a member
of more than one multicast group. Multicast groups are identified by IP addresses in the Class
D range (224.0.0.0 to 239.255.255.255). A multicast server sends packets addressed to a
particular multicast group (multicast IP address).
Server
Multicast Routers Hosts