MLD versions

MLD has the following versions:

• MLDv1 (defined by RFC 2710), which is derived from IGMPv2.

• MLDv2 (defined by RFC 3810), which is derived from IGMPv3.

MLDv1 and MLDv2 support the ASM model. MLDv2 can directly implement the SSM model, but MLDv1 must work with the MLD SSM mapping feature to implement the SSM model. For more information about the ASM and SSM models, see "Multicast overview."