Software-defined networks (SDNs) are a new innovation in networking. The technology is emerging, implemented in a slowly growing community of real-world networks. There remains a great deal to learn about how to both build and manage SDN.
Researchers are using the available information about the OpenFlow protocol to create test networks and to run network simulations. Of particular interest is how SDN and legacy networks will interact. It is realized that, given the scale of networks today, there will never be a way to perform a “flash cut” to convert a legacy network into SDN overnight, so interoperability is going to be important.
The initial work on SDN has been to apply it to traditional L2/L3 enterprise ...