Abstract: To alleviate the congestion problem using software defined network (SDN) in the modern data center network,a traffic scheduling based congestion control algorithm was proposed.When the link is congested,the proposed algorithm firstly discriminates the large flow of the maximum critical degree link in the congestion link,and then it reroutes the large flow,selects the minimum flow scheduling overhead,and calculates the scheduling cost.Finally,the minimum scheduling cost flow can be scheduled based on the above-mentioned process.Experimental results show that,the proposed algorithm can alleviate network congestion,improve the link utilization and enhance the network stability by reducing the dropout rates.

Key words: Data center network,SDN,Network congestion