Configuration Guide Configuring IGMP Snooping
10 Configuring IGMP Snooping
10.1 Overview
Internet Group Management Protocol (IGMP) snooping is a mechanism of listening to IP multicast. It is used to manage and
control the forwarding of IP multicast traffic within VLANs, realizing Layer-2 multicasting.
As shown in the following figure, when a Layer-2 device is not running IGMP snooping, IP multicast packets are broadcast
within the VLAN; when the Layer-2 device is running IGMP snooping, IP multicast packets are transmitted only to profile
members.
Figure 10-1 Networking Topology of IP Multicast Forwarding within the VLAN Before and After IGMP Snooping is Run on the
Layer-2 Device
As shown in the following figure, when IGMP Snooping does not run on the AC and AP in wireless multicast environment,
multicast packets are broadcasted within the VLAN of the AC and are broadcasted by the AP to all wireless ports. When
IGMP Snooping runs on both the AC and AP, multicast packets of a known multicast profile are not broadcasted but
forwarded to specific receivers.
Figure 10-2 Forwarding of IP Multicast Streams in a VLAN Before and After IGMP Snooping Is Enabled on the AC and AP
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