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如何在规模庞大的数据中心网络内部进行负载均衡,实现网络资源的优化利用,是个亟待解决的问题.OpenFlow技术提供了一种可编程操作的流量控制方法,已成为近期解决负载均衡问题的热门关键技术.针对数据中心常见的Fat-tree网络拓扑,就数据流在OpenFlow网络中的路径设计问题,利用OpenFlow网络控制器集中控制的优势,在控制器上设计并实现了一种动态负载均衡路由策略.该策略首先选出源节点与目的节点间的前K条最短路径,然后根据获取的网络链路实时状态信息,对选出的前K条路径进行多指标综合评价,并从中选出数据流的最优转发路径.最后,采用Floodlight控制器和Mininet仿真平台,对提出的负载均衡路由策略进行可行性验证和性能验证.结果表明,该策略有效缓解了网络阻塞,提高了链路利用率.
How to load balance and achieve optimal utilization of network resources in a large-scale data center network is an urgent problem to be solved.OpenFlow technology provides a programmable operation flow control method and has become a hot key to solve the load balancing problem recently Technology.For the common Fat-tree network topology in data center, the path design problem of data flow in OpenFlow network is solved by taking advantage of the centralized control of OpenFlow network controller. A dynamic load balancing routing strategy is designed and implemented on the controller The strategy chooses the shortest K path between the source node and the destination node first, and then makes a comprehensive multi-index evaluation of the selected K paths based on the acquired real-time state information of the network link, and chooses the data flow Finally, Floodlight controller and Mininet simulation platform are used to verify the feasibility and performance of the proposed load balancing routing strategy.The results show that this strategy can effectively alleviate the network congestion and improve the link utilization.