What is the difference between overlay networks and SDN?

By Bruno Hareng, SDN / Security Product Line Manager -EMEA HP Networking

There is often confusion between Overlay and SDN. The notion of the Overlay network was created, which consisted in being able to provision networks on demand of applications and to interconnect its networks through the different servers. It turns out that the first use, therefore by the nature of the research that has been made of Overlay networks was an SDN network. But the SDN network applies to any type of network. The difference is that we can use the concept of separating the data plane from the control plane and we can apply it to a physical network as well as a virtual one.


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