Network security in a "virtual datacenter OS" (Score 4, Interesting)

We have IEEE and RFC for standardization of ethernet/switching and routing respectively. What standards exist for virtual environments? As commercial security vendors move into this space, we're headed back into a cycle of supporting multiple architectures. "Security Vendor X" must now understand how VMWare, Hyper-V, Xen, and other VM environments perform their networking. Virtualization of the entire OSI model renders the physical and data link layers obsolete. Why emulate them at that point? Not to say ethernet will disappear, but I can see a point where operating systems evolve branches that run in pure play virtual environments. Those offshoots will shed unnecessary things like MAC addresses as the VM vendors begin defining the new network standards themselves.