IP Multicast Data Forwarding Considerations

When processing a packet whose destination MAC address is a multicast address, an IEEE standard bridge forwards a copy of the packet to each of the remaining network interfaces that are members of the same VLAN.

By default, unregistered multicast data packets are flooded to all ports in the VLAN.

By creating static Layer 2 multicast forwarding entries, multicast groups can be registered, and data can be forwarded only to selected ports.