Avaya Configuring IP Multicasting and Multimedia Services Manual de usuario Pagina 261

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Configuring IGMP Relay
117355-D Rev 00
9-7
A downstream host can also send an unsolicited join message to the IGMP Relay
device. IGMP Relay forwards the message upstream to the IP multicast router.
In Figure 9-5
, the following events occur:
1. A host on LAN B sends an unsolicited join message to the IGMP Relay
device. IGMP Relay forwards the join message to the IP multicast router.
2. The IP multicast router receives a datagram addressed to the group that the
host has joined.
3. The IP multicast router forwards the datagram downstream to IGMP Relay.
4. IGMP Relay determines that a member of the group resides on LAN B and
forwards the datagram on the downstream interface to LAN B.
Figure 9-5. IGMP Relay and Downstream Multicast Data
IP0074A
IGMP Relay
IP
multicast router
1.
3.
2.
4.
LAN A
LAN B
LAN C
Host 1
Group
member
Key
Unsolicited join message
Multicast data
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