To be clear you can do 8100 on the VMAN but you would have to map the VLANs from the edge to the VLANs in the core which may be a major management headache. If you don't properly match it then you can get inter VLAN leaking because a VLAN can have the same tag as a VMAN . This is why the standard is to use a different ethertype.
P
