Windows 7 & Vista send of DHCPv6 packets to multicast MAC 33:33:00:01:00:02 (IPv6 ff02::1:2) and this packets received on interfaces from other VLAN (VLAN L2 without L3 SVIs). Also IPv6 send IGMP membership packets to L2 VLAN too.
It's not a problem, it's a protocol. Use it. Use IPv6 volunteerly before you will be obliged to.
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