Research Of Control Method Based On OpenFlow

Software Defined Network is one of the research hotspots in the network research. It may soon become the development direction of next generation Internet, so it catches the eyes of scholars, Internet companies, telecom operators, equipment manufacturers in recent years. The Software Defined Network compared to traditional network is still in an early stage. There are only several kinds of network device developed by few manufacturers. Most scholars only use mininet or NETFPGA to do experiment currently.Firstly, this paper presents the definition and background of SDN, and shows advantage of SDN. This paper makes a detailed analysis of OpenFlow. This paper also discusses features of OpenFlow controller and a container for algorithm made by HuaWei Company.Secondly, this paper realizes an intelligent routing algorithm for real time network on Floodlight controller, named Hybrid Loading Improved Algorithm, after researched Dijkstra Algorithm and the principle of SDN controller. Hybrid Loading Improved Algorithm refers to meeting the Dijkstra algorithm, by considering the network load conditions. In spite of the busy path, this paper uses the Dijkstra algorithm to obtain the optimal path. Then, this application informs the controller to add the flow to switch, to change the path, in order to gain more network bandwidth. Using the Algorithm, we reduced the network pressure.Thirdly, the Hybrid Loading Improved Algorithm was tested on mininet and the platform created using Open vSwitch. It's convenient and steady to test the algorithm on mininet. The platform uses multiple PCI interfaces in common PC to act as switch interfaces. Then we use built-in network interface or wireless network interface to connect the controller. Devices in this network topology structure, whose performance can not be compared with professional equipment, but its reaction result is more real than mininet.Finally, the data collected from experiment under different algorithm and different platform was analyzed. The test shows that Hybrid Loading Improved Algorithm runs well on these two environments. Compared to just run the Dijkstra algorithm in Software Defined Network, Hybrid Loading Improved Algorithm improves the utilization ratio of network source and quality of service of network.