VMware has filed an intresting IETF internet draft.This document describes Virtual eXtensible Local Area Network (VXLAN), which is used to address the need for overlay networks within virtualized data centers accommodating multiple tenants. The scheme and the related protocols can be used in cloud service provider and enterprise data center networks.
VXLAN: A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks.
http://tools.ietf.org/html/draft-mahalingam-dutt-dcops-vxlan-00
