Protocol Comparison

Table 1 compares MLDv1 and MLDv2

**Table 1** Protocol Comparison
MLDv1	MLDv2	Advantages of MLDv2 over MLDv1
An MLDv1 message contains multicast group information, but does not contain multicast source information.	An MLDv2 message contains both multicast group and source information.	MLDv2 allows hosts to select multicast sources, while MLDv1 does not.
An MLDv1 message contains the record of only one multicast group.	An MLDv2 message contains records of multiple multicast groups.	MLDv2 reduces the number of MLD messages on a network segment.
The Multicast Listener Query messages of a specified multicast group cannot be retransmitted.	The Multicast Listener Query messages and Multicast Listener Query messages of a specified multicast source/group can be retransmitted.	MLDv2 ensures better multicast information consistency between a non-querier and a querier.