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DES-7200 Configuration Guide Chapter 8 IGMP Snooping
Configuration
8-2
Figure 1
DES-7200 multicast products support both the layer 2 multicast(IGMP Snooping)
function and the layer 3 multicast(Multicast-routing) function. That is to say, to
realize better packet forwarding function, DES-7200 device supports not only the
layer 3 multicast route forwarding, but also the snooping in the VLAN.
8.1.2 Understanding the Type of IGMP Snooping Ports
As shown in the Figure 2, the Router is connected with the multicast source. The
IGMP Snooping is enabled on the SwitchA. HostA and HostC are receives (that is,
the IP multicast group member)