基于SDN的动态负载均衡策略  

Dynamic load balancing strategy based on SDN

作　　者：刘毅 李凯心 李国燕 潘玉恒 Liu Yi;Li Kaixin;Li Guoyan;Pan Yuheng(College of Computer&Information Engineering,Tianjin Chengjian University,Tianjin 300384,China)

机构地区：[1]天津城建大学计算机与信息工程学院,天津300384

出　　处：《计算机应用研究》2020年第10期3147-3152,共6页Application Research of Computers

基　　金：国家自然科学基金资助项目(61871380);天津市自然科学基金资助项目(17JCQNJC00500);天津市科技特派员项目(18JCTPJC61800);天津市教委科研计划资助项目(2018KJ174,2017KJ058)。

摘　　要：针对SDN中静态网络结构不能适应动态流量变化所引起的控制器负载不均衡问题,提出一种阶段式动态负载均衡策略。阶段一以控制器负载均值化为目标,确定迁入控制器候选集,且综合考虑时延、负载,设计指标函数,选取待迁移交换机;阶段二考虑网络节点间的连通性,以最小迁移代价为目标,提出改进的EMD模型,并用线性逼近算法快速求解,实现了交换机的快速并行迁移。实验结果表明,与现有的负载均衡策略相比,其改善了迁入控制器和交换机的选取过程,优化了网络性能,控制器的负载均衡度提升了约31.4%。To solve the problem of controller load imbalance caused by static network structure can’t adapt to the dynamic change of traffic in software defined networking,this paper proposed a stage dynamic controller load balancing strategy(SDCLB).In phase one,it determined the candidate set of immigration controller with the aim of load equalization,and considered the delay and loaded comprehensively,designed index function to determine the switch to be migrated.In phase two,it considered the connectivity of network nodes,proposed an improved EMD model with minimum migration cost and used the linear approximation algorithm to solve it quickly.The method realized the fast parallel migration of switches.Results show that compared with the existing load balancing strategy,this strategy improves the process of selecting immigration controllers and switches,and optimizes network performance.The load balancing degree of this strategy increases by about 31.4%.

关 键 词：软件定义网络 负载均衡 交换机迁移 均值化 EMD模型 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]