Multicast Architecture 193
Figure 59 Positions of Layer 2 multicast protocols
Running on Layer 2 devices, Internet Group Management Protocol Snooping
(IGMP Snooping) are multicast constraining mechanisms that manage and control
multicast groups by listening to and analyzing IGMP messages exchanged
between the hosts and Layer 3 multicast devices, thus effectively controlling the
flooding of multicast data in a Layer 2 network.
Layer 3 multicast protocols
n
We refer to IP multicast working at the network layer as Layer 3 multicast and the
corresponding multicast protocols as Layer 3 multicast protocols, which include
IGMP, PIM, and MSDP among others. Note that the Switch 4210 does not support
Layer 3 multicast protocols.
Layer 3 multicast protocols include multicast group management protocols and
multicast routing protocols.
Figure 60 describes where these multicast protocols
are in a network.
Source
Receiver Receiver
multicast packets
IGMP Snooping
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