Research On Software-defined Networking Routing Algorithm Based On QoS

The coupling between delivering and controlling of data is intensely close in traditional Internet devices,which will make it difficult to allocate the routing algorithm on the device with specific network requirements and provide Quality of Senvice(QoS)of links in real-time transmission service with low bandwidth.Software-Defined Networking(SDN)is a new network architecture which has loose coupling of control plane with the data plane.Therefore,the network becomes more controllable and operable as a transmission pipeline through SDN architecture.Previous QoS routing algorithm in SDN is based on a single-parameter constain such as band width delay or packet loss,which can not provide QoS with multiple constains.In this theis,the Differentiated Services(DiffServ)model based on priority transmission was proposed,which can conduct the priority division of data flow based on the TOS in the packet network layer in real-time transmission.The Lagrangian Relaxation based Multiple Constains(LR4C)QoS routing algorithm by analyzing bandwidth,delay and packet loss rate between links,the optimal link based on the combination of these three factors was obtained to provide QoS in SDN.The routing management system including topology constructing module,network monitoring module,routing calculating module and QoS fink management module was impelemented,which demonstrated the advantage of this algorithm.