An implementation model and solutions for stepwise introduction of SDN

Software Defined Network (SDN) is revolutionizing the networking industry by a potential of enabling flexible and uniform management by decoupling the control plane and forwarding plane. However, there are several issues on scalability and adaption against conventional network protocols to implement on the large scaled network. To address these issues, we propose an implementation method which runs SDN controller and Quagga on SDN switch in this paper. By controlling information of each SDN controller uniformly with the upper layer controller, it could be able to handle each problems of implementing SDN without missing the advantage of SDN. Furthermore, by implementing prototype of our model, we will discuss some issues on the implementation of SDN system.