Cisco Systems 3560 사용자 설명서

The switch supports two versions of MLD snooping:

MLDv1 snooping detects MLDv1 control packets and sets up traffic bridging based on IPv6 
destination multicast addresses. 

MLDv2 basic snooping (MBSS) uses MLDv2 control packets to set up traffic forwarding based on 
IPv6 destination multicast addresses.

The switch can snoop on both MLDv1 and MLDv2 protocol packets and bridge IPv6 multicast data 
based on destination IPv6 multicast addresses. 

The switch does not support MLDv2 enhanced snooping (MESS), which sets up IPv6 source and 
destination multicast address-based forwarding.

MLD snooping can be enabled or disabled globally or per VLAN. When MLD snooping is enabled, a 
per-VLAN IPv6 multicast MAC address table is constructed in software and a per-VLAN IPv6 multicast 
address table is constructed in software and hardware. The switch then performs IPv6 multicast-address 
based bridging in hardware. 

These sections describe some parameters of IPv6 MLD snooping:

MLDv1 supports three types of messages:

Listener Queries are the equivalent of IGMPv2 queries and are either General Queries or 
Multicast-Address-Specific Queries (MASQs).

Multicast Listener Reports are the equivalent of IGMPv2 reports.

Multicast Listener Done messages are the equivalent of IGMPv2 leave messages. 

MLDv2 supports MLDv2 queries and reports, as well as MLDv1 Report and Done messages. 

Message timers and state transitions resulting from messages being sent or received are the same as those 
of IGMPv2 messages. MLD messages that do not have valid link-local IPv6 source addresses are ignored 
by MLD routers and switches. 

The switch sends out MLD queries, constructs an IPv6 multicast address database, and generates MLD 
group-specific and MLD group-and-source-specific queries in response to MLD Done messages. The 
switch also supports report suppression, report proxying, Immediate-Leave functionality, and static IPv6 
multicast MAC-address configuration.