"vpn exchange point" VLAN Exchange Points NANOG50 Atlanta.311
Tagged VLANs make most sense in dense MetroLANs (MANs)
What goes on in Atlanta Stays in Atlanta - NANOG50
http://en.wikipedia.org/wiki/IEEE_802.1Q
What goes on in North America Stays in North America ? NA ? North America ?
Note: 33-bit IPv4 addressing is half of 66-bit Tagged VLAN - LOC.ID