基于FPGA的SDN中QoS保障算法的设计与实现

he traditional network is increasingly difficult to face the complex network structure, so a new network architectureis born, namely software defined network (SDN). The service flow of SDN data center mainly includes long stream andshort stream. The long stream has the characteristics of long duration, insensitive delay and high bandwidth demand; whileshort flow has short duration, high delay sensitivity and low bandwidth requirement. Short flows account for less than 20%of the total traffic, but the number of traffic bars is about 80% or more of the total traffic; long flows account for more than80% of the total traffic, but the number of traffic bars is less than 20% of the total traffic. It is found that the long flow isoften ahead of the short flow in the outgoing port queue, causing the short flow to wait for a long time, which is very likelyto cause network congestion. The design proposes a queuing mechanism and a route optimization guarantee mechanism basedon the characteristics of the two service flows, setting the short flows as high-priority queues, which are prioritized andscheduled by the SDN controller; setting the long flows as low-priority queues, while using a route guarantee algorithm forcompensation. The routing assurance algorithm first removes the links that do not meet the bandwidth requirements of thelong flows, and then calculates the shortest delay path. In order to improve the efficiency of the algorithm of this design'FPGA and 10G ethernet are used to simulate the service flow in SDN, and simulate on FPGA to verify the advantages of thisdesign for the optimization of network delay, bandwidth and FPGA parallel computing.