The protocol doesn't force this centralization to be physical, just logical -- Hyperflow[1] is one example of how a physically distributed control plane can be

The protocol doesn't force this centralization to be physical, just logical -- Hyperflow[1] is one example of how a physically distributed control plane can be created. [1] http://static.usenix.org/event/inm10/tech/full_papers/Tootoonchian.pdf http://static.usenix.org/event/inm10/tech/full_papers/Tootoo...