Smc-networks SMC TigerStack II SMC6624M Manual de usuario Pagina 266

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9-96
Configuring Advanced Features
Multimedia Traffic Control with IP Multicast (IGMP)
Configuring Advanced
Features
Switch 2 is recognizing IGMP traffic and learns that PC 4 is in the IP
multicast group receiving multicast data from the video server (PC X).
Switch 2 then sends the multicast data only to the port for PC 4, thus
avoiding unwanted multicast traffic on the ports for PCs 5 and 6.
Figure 9-67. The Advantage of Using IGMP
The next figure (9-68) shows a network running IP multicasting using IGMP
without a multicast router. In this case, the IGMP-configured switch runs as a
querier.
PCs 2, 5, and 6 are members of the same IP multicast group.
IGMP is configured on switches 3 and 4. Either of these switches can operate
as querier because a multicast router is not present on the network. (If an
IGMP switch does not detect a querier, it automatically assumes this role,
assuming the querier feature is enabled—the default—within IGMP.)
PC X
Video
Server
Router
Router
PC 1
Video
Client
Switch 1
Router
Router
Switch 2
PC 2
PC 3
PC 4
Video
Client
PC 5
PC 6
Multicast
Data Stream
IGMP is NOT
Running Here
IGMP IS
Running Here
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