H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 199)

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Configuring IGMP snooping
Overview
IGMP snooping runs on a Layer 2 switch as a multicast constraining mechanism to improve multicast
forwarding efficiency. It creates Layer 2 multicast forwarding entries from IGMP packets that are
exchanged between the hosts and the router.
As shown in Figure 145 , when IGMP snooping is not enabled, the Layer 2 switch floods multicast packets
to all hosts. When IGMP snooping is enabled, the Layer 2 switch forwards multicast packets of known
multicast groups to only the receivers.
Figure 145 Multicast forwarding before and after IGMP snooping runs
For more information about IGMP snooping, see " About the H3C Access Controllers Web-Based
Configuration Guide ."
Recommended configuration procedure
Step Remarks
1. Enabling IGMP snooping globally
Required.
By default, IGMP snooping is disabled.