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Configuring igmp snooping, Overview, Recommended configuration procedure – H3C Technologies H3C WX3000E Series Wireless Switches User Manual

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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.