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XG2000 series User's Guide
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All Rights Reserved, Copyright (C) PFU LIMITED 2009
4.9 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/v3.
z IGMP v3 does not support source IP addressing and filtering.
z IGMP snooping and the uplink filter function cannot be used at the same time.
z The XG2000 series floods IGMP Report messages. When IGMP v1/v2 is used, it is necessary to
connect a device, such as a L3 switch, that supports IGMP snooping between the XG2000 series and
the IGMP hosts in order to avoid flooding.
z It is necessary to set forward-unregistered-mac or filter-unregistered-mac when IGMP snooping is
used.