ZyXEL Communications XGS-4728F - Manual (Page 287)

XGS-4728F User’s Guide
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H A P T E R
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IGMP
This chapter shows you how to configure the Switch as a multicast router. See also
Section 24.4 on page 203 for information on IGMP snooping.
33.1 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 155 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