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Overview
5-3
Figure 5-1 shows a typical packet path before snooping occurs.
Figure 5-1
Multicast Packet Path before Snooping
Eliminating
unwanted IP
multicast protocols
IGMP snooping switch and multicast MAC address filters work together
to eliminate unwanted IP multicast routing protocols as follows:
■
The IGMP snooping switch filters IP multicast packets based on
IGMP/IP and IP multicast packets to only the subset of ports that are in
a multicast group.
■
The multicast MAC address filters
restrict
multicast packets to only the
subset of ports that request this traffic, thus freeing up bandwidth for
useful traffic.
Host 2
Host 1Host 3
Multicast
Router
Host 3 sends a
Multicast Packet
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