基于带宽匹配的软件定义数据中心网络流量节能调度方案

Traffic energy efficient scheduling scheme based on bandwidth matching in software defined data center networks

针对数据中心网络的流调度优化问题,选用经典的Fat-Tree拓扑结构,利用软件定义网络集中控制的优势,提出一种基于带宽匹配的节能路由算法(energy efficient routing algorithm,EERA)。EERA首先对需要传输的数据流按照其截止时间进行排序,然后对拓扑中的链路权值按照每个排序后的数据流需要传输的数据量进行更新,删除可用带宽不满足传输数据量的链路,得到新的拓扑图。在重新定义的拓扑图中,EERA计算源节点和目标节点之间所有可用链路,从这些可用链路中选取与流传输数据量所需带宽最匹配的链路进行路由。仿真实验表明,在不增加额外存储开销的前提下,EERA为即将到来的数据流预留了足够的带宽,减少了网络链路拥塞,在节省网络能耗的同时实现了网络负载均衡。

To solve the traffic scheduling optimization problem in the data center networks,an energy efficient routing algorithm(EERA)is proposed based on bandwidth matching in the software defined data center networks,and takes the advantage of the software defined network centralized control using classic Fat-Tree topology.EERA sorts the traffic according to their deadlines and traffic sizes and updates the link weights in the topology for each sorted traffic according to the amount of data.Then EERA deletes the links whose available bandwidth does not meet the amount of transmitting data and gets a new topology.In the redefined topology,EERA calculates all the available links between the source node and the target node,then selectes the optimal links from these available links that match the bandwidth required by traffic transmitting.Simulation results show that EERA reserves enough bandwidth for incoming traffic with no additional storage overhead,and reduces the network congestion.At the same time,EERA saves the network energy consumption and achieves the network load balancing.