Configuration Guide Configuring IGMP Snooping
Protocols and Standards
RFC4541: Considerations for Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD)
Snooping Switches
10.2 Applications
Layer-2 Multicast Control
Enables precise forwarding of Layer-2 multicast packets to avoid flooding at this layer.
Conversion from Multicast to Unicast
Realizes conversion from multicast to unicast between AP to STA.
10.2.1 Layer-2 Multicast Control
Scenario
As shown in the following figure, multicast packets are transmitted to users through a Layer-2 switch. When Layer-2 multicast
control is not performed, namely, when IGMP snooping is not implemented, multicast packets are flooded to all the users
including those who are not expected to receive these packets. After IGMP snooping is implemented, the multicast packets
from an IP multicast profile will no longer be broadcast within the VLAN but transmitted to designated receivers.
Figure 10-3 Networking Topology of Implementing Layer-2 Multicast Control (Multicast VLAN)
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