39.7 Performance Considerations
39.7.1 Network-Switch Filtering
By default, multicast traffic is treated as broadcast traffic by layer 2 switches. To avoid flooding the network with broadcast traffic and take full advantage of network filtering, the layer 2 switches should be configured to use IGMP snooping. Refer to your switch’s manual for specific instructions.
When IGMP snooping is enabled, a switch can route a multicast packet to just those ports that subscribe to it, as seen in Figure 39.6: IGMP Snooping.
