[EVB] What is EVB?

The introduction of EVB
http://networkerhere.blogspot.tw/2012/11/impact-of-server-virtualization-on_13.html
http://blog.ipspace.net/2011/05/edge-virtual-bridging-evb-8021qbg-eases.html

Due to overlay network, EVB is becoming to die ...!? The most main reason is that VLAN is not able to scale:
http://blog.ipspace.net/2012/02/edge-virtual-bridging-8021qbg.html

There are also some similar approaches, such as, VN-Tags that can do the same thing as EVB.
http://www.definethecloud.net/access-layer-network-virtualization-vn-tag-and-vepa/