Research On Multipath Transmission And Congestion Control In The Software Define Network

With the development of cloud compute and big data,network business unprecedented prosperity,traffic is exponentially increasing.However,the demand of users for QoS increased gradually,then how to control traffic and protect the QoS is the most important question in currently.The traditional network is difficult to suit the demand of developing.Software define network is a new architecture of network,by separating the control and forwarding functions from traditional network devices and formed a centralized control plane,to achieve centralized management of the network and unified implement the routing strategy;In current software define network architecture,most of the route algorithm are focus on the protection on QoS of the data flow,with the increasing of data flow,it will be appear some problem of resource scheduling balance,result in the high delay,packet loss and Link congestion.So,in our article,We do research of route algorithm and congestion control algorithm in software define network deeply,we put up two kinds of algorithm under below.In this paper,we have do research deeply in how to reduce the delay and packet loss of data flow,improve the network throughput under the software define network architecture,we propose an business attribute-related multi-path routing algorithm.through classify the network data flow according its business attributes,and use the different requirements of different kinds of business attributes of the data flow on the delay and packet loss rate,combined with ant colony iterative ideas,by introducing the delay and packet loss into node selection probability function,choosing the multi-path for data flow based on the business attribute.The results of simulation show that the algorithm proposed in this paper can effectively reduce the delay and packet loss rate of the data stream and improve the throughput of the network.In order to mitigate the congestion of link and guarantee the QoS attributes of the data flow at the same time,we propose a congestion control algorithm based on QoS.Using the controller to compute the bandwidth utilization of the link to judge whether the link is in state of congestion,we take the method of reroute for data flow which in the congestion link,In order to ensure the QoS attribute of the data flow and avoid the re-congestion at the time of choose the rerouting,we introduced the delay,packet loss rate and the bandwidth utilization of link into the objective function,and used the artificialfunction genetic algorithm to solve the objective function and get the appropriate transfer path.The simulation results show that the algorithm we proposed can effectively solve the link congestion and reduce the delay and packet loss rate of the data stream which re-transferred.