Research On QoS And STP Protocols In Software-defined Networks

With the rapid development of artificial intelligence,big data and Internet services,the traditional networks can not meet fully the needs of social development in communication performance and network maintenance.The software definition network(SDN),a new network architecture,has the characteristics of data control separation,software programmability and centralized control.SDN can flexibly deploy network applications,solve the problem of network rigidity,and realize network innovation.However,the SDN still have some problems of quality of service(QoS)and network redundancy like traditional networks.So in this paper,we deploy more flexible routing mechanism to meet the QoS requirements of different applications,as well as solve the problem of network redundancy through the code optimization of STP protocol,and the simulation experiments have been carried in our research.The main research contents are as follows.(1)For the imbalance load and unmet QoS in SDN,we propose a QoS routing mechanism b.ased on hierarchical analysis algorithm taking the advantage of SDN for the facilitate access to each link of information.In this QoS routing mechanism,we take into account the factors of the link bandwidth available,the utilization rate of bandwidth,delay,packet loss rate and delay jitter,based on network traffic.The most appropriate path is selected from the K shortest path through various considering the preference of flow of data resources.Simulation experiments are carried out based on Ryu controller and Mininet simulation platform,and the results show that the proposed QoS routing mechanism can balance the impact of various factors on the link,reduce resource bottlenecks and provide users with better service.(2)For the redundancy of network routing and access control in traditional network,we use the centralized control mechanism of SDN,and the realization theory of solving the network the loop of the two-level spanning tree algorithm is analyzed.The code is optimized by adding the limitation of the switch address and running time,the control of network is accessed.The application cases are simulated,and the results show that the proposed scheme is effective and feasible,which can not only ensure the redundancy of the network,but also make the network routing and access more flexible and reduce unnecessary resource waste.