Feature Minimum Required Cisco IOS Release by Release IPv6 multicast 12.0(26)S, 12.2(18)S, 12.3(2)T
IPv6 address formats 12.2(2)T, 12.0(21)ST, 12.0(22)S, 12.2(14)S, 12.3(1)
Multicast Listener Discovery (MLD) protocol, Versions 1 and 2 12.0(26)S, 12.2(18)S, 12.3(2)T
MLD access group 12.0(26)S, 12.3(4)T
PIM sparse mode (...)