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Configuring the Switch
IP Multicast (IGMP) Service Features—Multimedia Traffic Control
Configuring the Switch
Figure 6-19. The Advantage of Using IGMP
The next figure (6-20) 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
IGMP IS
Running Here
IGMP is NOT
Running Here
Multicast
Data Stream
Sraswb.book : SIER_SW6.FM Page 40 Tuesday, June 30, 1998 12:20 PM