SDN数据中心网络基于流表项转换的流表调度优化  

Flowtable Scheduling Optimization based on Flowentry Conversion in SDN-based Datacenter Networks

作　　者：唐菀[1] 王敢甫 吴京京 王文涛[1] 

机构地区：[1]中南民族大学计算机科学学院,武汉430074 [2]武汉烽火信息集成技术有限公司IT事业部,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2017年第3期111-117,共7页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金资助项目(61103248)

摘　　要：针对基于软件定义网络(SDN)架构的数据中心网络中,SDN交换机流表资源的有限性导致的流表溢出或控制器拥塞等问题,引入空闲流表资源代价的概念描述了网络资源的利用率,并分析了空闲流表资源量与重复下发的流表项数量之间的关系,提出了一个基于流表超时机制的流表调度策略,依据流表项生存时间和匹配计数来进行静态流表项和动态流表项之间的实时转换.在Fat-tree拓扑SDN数据中心网络仿真实验中,对该机制对流表资源优化的有效性进行了验证.The resource limitation of the flowtable in Open Flow switches causes the problem of flowtable overflow or controller congestion in the SDN-based datacenter network. To address the issue,in this paper,the concept of Free Entries Cost is introduced for describing the utilization efficiency of network resources,and the relationship between the numbers of free flowtable resources and that of the flowentries being forwarded repeatedly is analyzed. Then,a flowtable scheduling strategy based on the flowtable timeout mechanism is proposed,which can do real-time conversion between static and dynamic flowentries according to the survival time and the count of the flowentry matching. Via the simulation platform of SDN-based datacenter network with the Fat-tree topology,the availability of the proposed mechanism for optimizing the usage of flowtables is verified.

关 键 词：软件定义网络 数据中心网络 资源代价 流表调度 

分 类 号：TP393.02[自动化与计算机技术—计算机应用技术]