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XG1200 User's Guide
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4.8 IGMP Snooping
IP multicast is often used to distribute multimedia data, including video and voice, over a network.
A general layer 2 switch floods multicast frames, causing absorption of unnecessary network bandwidth. A layer 3 switch that
supports Internet Group Management Protocol (IGMP) manages multicast groups using IGMP packets. The XG1200 controls
to forward IP multi packets to required ports only by snooping IGMP packets between these layer 3 switches, preventing
unnecessary flooding. This function is called "IGMP Snooping".
The XG1200 supports IGMP snooping for IGMP v1/v2/v3.
IGMP v3 does not support source IP addressing and filtering.