基于SDN流量测量的数据中心多路径传输研究

Multipath routing research based on traffic measurement under SDN in data center networks

为了避免链路出现拥塞,针对数据中心流调度策略在进行数据流迁移尤其是大流的迁移容易产生数据流丢包并出现接收端数据包乱序,从而造成网络吞吐量降低的问题,基于SDN/OpenFlow架构,提出了一种采用熔断机制的动态路由算法F-TAM;同时,设计了新的测量方法来获取精确的链路状态时效信息,当算法被触发时能及时计算出合理的熔断时间,从而能充分利用网络中存在的多路径进行负载均衡,并解决了由于传输路径的不同时延所造成的接收端数据包乱序问题.实验结果表明:F-TAM能够利用网络中的冗余链路进行细粒度负载均衡并提升网络吞吐量,且不会出现接收端数据包乱序的问题.

In order to evade the risk of congestion in data center networks,and to address the problem that exiting flow-based scheduling strategies based on multipath routing,especially for large flows,may cause the problem of packet loss and packets disordering at receivers,thus having a negative impact on network throughput,a dynamic routing algorithm based on fusing mechanism under SDN/OpenFlow architecture,called fusing-time algorithm based on multipath（F-TAM）was proposed,and a measurement method was designed to obtain accurate link-state information.Thus the value of fusing-time could be figured out when F-TAM was triggered,which could take full use of multipath for load balance and solve the problem of packets disordering caused by the delay difference of multiple paths.The experiment results show that F-TAM is able to take use of the redundant links in data center networks for fine-grained load balance and improve the network throughput without packets disordering at receivers.