When working in overlay & underlay networks, it’s a requirement to be able to differentiate between software VLANs in the overlay, and hard VLANs in the underlay.
When working in a VMware only environment, it’s common to refer to them as VLANs and VXLANS, but when writing about more general overlay networks you need to consider that protocols like NVO3 and NVGRE don’t make sense.
My answer is to the term oVLAN = Overlay VLAN and uVLAN =Underlay VLAN.
I’ve consider using pVLAN = Physical VLAN but this is already used for Private VLANS (PVLANS) and most people don’t get the point straight away.
I’d interested to hear what anyone else thinks about naming VLANs in the underlay and the overlay network. Getting a consistent language would help in my design meetings.