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Application Examples
Source
Host A
Host B
Router A
Switch A
IGMP snooping
Host C
Figure 0-2 IGMP SNOOPING configuration examples
Illustration:
Port 0/1 of Switch A is connected with the router; port 0/2 is connected with host A; port 0/3
is connected with host B; port 0/4 is connected with host C.
Add port 0/1 in tagged mode on the switch to VLAN2; add port 0/2, port 0/3 and port 0/4 in
untagged mode to VLAN 2; enable IGMP snooping on the switch.
Host A sends IGMP report packets to reserve the multicast data with multicast address as
224.1.1.1; Host B sends IGMP report packets to reserve the multicast data with multicast
address as 224.1.1.1; IGMP snooping maintains a multicast forwarding table on the switch.
The multicast data sent from source multicast reaches the switch via the router. The switch
sends the multicast packets to port 0/2 and 0/3 after searching in the multicast table; host A
and host B can receive the multicast data, but host C cannot. (If IGMP snooping is not enabled,
the multicast data floods in the VLAN and the three PCs receive the multicast data.)
You just need to enable IGMP snooping globally. The command automatically enables IGMP
snooping in all VLANs.
Command
Description
Содержание 065-7434
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