MLD - Snooping

Multicast Listener Discovery (MLD) snooping constrains the flooding of IPv6 multicast traffic on VLANs. When MLD snooping is enabled on a VLAN, the device examines MLD messages between hosts and multicast routers and learns which hosts are interested in receiving traffic for a multicast group. Based on what it learns, the device then forwards multicast traffic only to those interfaces in the VLAN that are connected to interested receivers instead of flooding the traffic to all interfaces.