Research On Data Transmission Path Selection In Software Defined Networking

With the rise of services such as cloud computing,big data,and mobile Internet,the degree of coupling between industries and networks has increased year by year.The rapid expansion of the network scale has brought a series of problems such as degraded transmission quality,difficulty in management,and weak scalability.In response to this situation,Software Defined Networking(SDN)came into being.Different from the traditional network,SDN separates the control layer and the data layer which are tightly coupled in the network device,so that the control of network is more centralized,and the programmable interface is provided at the application layer.SDN has a flexible programming capability.Developers can program the network through an open interface.Applications at the application layer can direct the forwarding of network data streams by controlling the SDN controller.Based on SDN,this paper focuses on the following issues in the selection of transmission paths for network data streams:(1)Through the study of SDN related technical knowledge,the study of network data stream transmission path selection is conducted.In order to increase the transmission speed of network data stream and reduce the transmission delay,this paper combines the traditional ant colony optimization algorithm to improve and integrate the improved ant colony algorithm(PB-ACO)into the SDN controller.According to the real-time status of each network device collected by the controller,the PB-ACO algorithm calculates and forwards the forwarding policy to the switch to select the data transmission path.After Mininet simulation experiments verify that there are multiple alternative paths between the source node and the destination node,the algorithm can effectively shorten the network delay in the transmission of network data streams.(2)By learning ECMP algorithm,in order to shorten the network data transmission time and combine the characteristics of software-defined network centralized control,an ECMP algorithm based on path weight(WECMP)is proposed.The algorithm distributes data streams to different transmission paths according to different weights according to different transmission path bandwidths.After the topology verification was performed by the Mininet simulation platform,the WECMP algorithm improved the transmission time of the equivalent data stream compared to the traditional ECMP algorithm...