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MLD Versions
MLD has two versions:
- MLDv1: corresponds to IGMPv2.
- MLDv2: corresponds to IGMPv3.
MLDv1 defines the IPv6 multicast member query and report mechanism. The process is the same mechanism as IGMPv2. MLDv2 works similarly to MLDv1. The most significant difference between the two versions lies in that MLDv2 allows hosts to specify the multicast sources they do or do not want to receive messages from. The MLD versions are backward compatible. Therefore, a multicast router running MLDv2 can identify MLDv1 protocol messages.
Both MLD versions support the Any-Source Multicast (ASM) model. MLDv2 can be directly used in the Source-Specific Multicast (SSM) model; however, MLDv1 can be applied to the SSM model only when MLD SSM mapping is configured. For details about the ASM and SSM models, see Multicast Service Models.