Is it State-of-the-Art or pre-launch advertising? In any case our editors believe that Cisco's overview of this new (and at least partially proprietary) hardware-centric approach to Network Virtualization is a must read. It contains a very sound summary of the network challenges in virtualized environments, a recap of VMware's Distributed Virtual Switch (DVS), Cisco's Nexus 1000V and a somewhat vague introduction to concepts such as port profile, VN-Link and vEth.