BGP is usually used for inter-domain unicast routing and by using MBGP (multiprotocol BGP) one can exchange both unicast and multicast routes with BGP. MBGP adds additional attributes to BGP for specifying whether information is IPv4 or IPv6, and whether it is unicast, for multicast RPF checking or both. MBGP is sometimes, at least in multicast circles, called multicast BGP.

There is no difference between using MBGP for multicast in IPv4 and IPv6. Configuration should be quite similar, and it is used in the same way. Note that MBGP is needed not only when doing ASM, but also for SSM.