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Configuring IP Multicasting and Multimedia Services
9-2
117355-D Rev 00
IGMP Relay Overview
An IGMP Relay device is a unicast router with an interface to a multicast router
and interfaces to one or more networks containing network hosts. Figure 9-1
shows an IGMP Relay device connected to three LANs containing host systems.
Figure 9-1. IGMP Relay Device
The IGMP Relay device provides the following group registration services for an
IP multicast router:
Sends IGMP host membership queries to hosts on its attached local networks
Receives host membership reports and unsolicited join messages from hosts
on its attached networks and forwards them to the attached multicast router
Forwards multicast data to group members on locally attached networks
For more information about IGMP, see Chapter 3, “Configuring and Customizing
IGMP.”
IP0077A
IGMP Relay
IP
multicast
router
LAN A
LAN B
LAN C
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