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XG Series User's Guide Chapter 4 Switch Functions and their Configuration
IGMP Snooping
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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 layer 2 switch floods multicast frames, absorbing unnecessary network bandwidth. A layer 3 switch that supports
Internet Group Management Protocol (IGMP) manages multicast groups using IGMP packets. The device controls how IP
multicast packets are forwarded to required ports by monitoring IGMP packets generated by layer 3 switches, thereby
preventing unnecessary flooding. This function is called "IGMP Snooping".
The device supports IGMP snooping for IGMP v1/v2.
IGMP Snooping
IGMP No Snooping
IGMP Snooping
Multicast Server
Multicast Router
Layer 2
Switch
Terminal
XG
Flooding to all
ports
Flooding to all
ports
Transfer only to
the required
ports
Transfer only to
the required
ports
Layer 2
Switch
Terminal
Multicast Server
Multicast Router