Igmp, 1 igmp overview, Chapter 33 igmp – ZyXEL Communications XGS-4728F User Manual
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IGMP
This chapter shows you how to configure the Switch as a multicast router. See also
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