Allied Telesis AT-S63 - Manual (Page 181)

AT-S63 Management Software Features Guide
Section III: Snooping Protocols 181
Overview
MLD snooping performs the same function as IGMP snooping. The switch
uses the feature to build multicast membership lists. It uses the lists to
forward multicast packets only to switch ports where there are host nodes
that are members of the multicast groups. The difference between the two
is that MLD snooping is for IPv6 and IGMP snooping for IPv4
environments. (For background information on IGMP snooping, refer to
“Overview” on page 177.)
There are two versions of MLD. MLDv1 is equivalent to IGMPv2 and
MLDv2 is equivalent to IGMPv3. The AT-9400 Switch supports snooping
of both MLDv1 and MLDv2.
Note
The default setting for MLD snooping on the switch is disabled.