Routing Technology Research In OpenFlow Network

With the development of the Internet,more and more security problem,performance bottlenecks and other drawbacks appeared in the network,demand for server is also growing rapidly.The control and forwarding layer from traditional networks are separated by OpenFlow technology.The control layer can be used for the flexible scheduling of network resources,and the flexible open interface can support the on-demand call of network capacity,the standard unified South interface realizes the virtual transparency of network devices.Through the physical device programming in order to change the way it works,that is,"software defined network".The current interconnection technology in OpenFlow network,mainly is two layer forwarding technology,so realize the routing functions in the OpenFlow network,to complete the three layer forwarding research is still very limited.Firstly,in this thesis,according to the current development of the Internet,the traditional routing algorithm is analyzed based on the introduction of the related technologies and development of OpenFlow;Secondly,the routing requirements is analyzed in OpenFlow network,to make the comparison according to the existing OpenFlow routing scheme,based on the that existing SDN controller provided routing service,routing system based on L3 component is gived;Finally,Finally,the topology of OpenFlow network is analyzed,and the routing algorithm in OpenFlow network is studied.According to the traditional routing algorithm for the mesh and fat tree structure in the OpenFlow network,traditional routing algorithm,based on flow routing algorithm and multi path routing based on ant colony algorithm is studied.According to the characteristics of the OpenFlow network,the whole network shortest path is calculated in different topologies based on traffic delay,bandwidth and hop factors.The performance of algorithm is compared by simulation.The algorithm of lower bandwidth usage,shorter time delay and faster routing calculate is selected to solve the problem of traffic forwarding in OpenFlow network.