Research on Congestion Control Link Algorithm of Computer Network Based on SDN

The network plays an important role in social production and life, in which the congestion control mechanism is closely related to network availability and user experience. Congestion management is an important research direction in the field of high-performance network, and network congestion will have a great impact on the global performance of the network. The existing congestion management mostly adopts distributed congestion avoidance strategy, which can solve the network congestion problem to a certain extent, but its processing process is based on local information, which can’t make full use of network resources and has low processing efficiency. SDN (Software Defined Networking) brings programmability and flexibility to the network. Based on this characteristic of SDN, this paper proposes a new network congestion control algorithm. In this algorithm, considering the differences between TCP and UDP, a new method for judging congested nodes is designed, and congestion control strategy is started for congested nodes, so as to achieve the dual optimization goals of relieving congestion and ensuring high link utilization.