软件定义网络(software defined network,SDN)是一种新兴的网络范式,其解耦了控制平面和数据平面,实现了网络管理的灵活性.然而,控制平面的逻辑集中化带来了新的挑战,即在各种故障情况下确保较高的可用性.文章在带内控制平面的前提下,提出一种控制平面恢复方法,该方法重复利用旧的控制路径规则,并建立相应的数学模型;最终提出一种考虑复用控制规则的树形恢复算法,并证明当控制路径以最短路径树的形式部署时,算法的近似度为3.实验结果表明,该方法具有较高的有效性.
Control path recovery for operation cost optimization in software defined network
Software defined network(SDN)is a new network paradigm.It separates the control plane from the data plane and realizes flexible network management.However,the logical centralization of the control plane brings a new challenge to the network stability,that is,how to achieve high availa-bility in various fault situations.On the premise of in-band control plane,this paper explores a control plane recovery method that reuses the old control path flow rules to reduce recovery operations,and puts forward a mathematical model.The paper ultimately proposes a tree-based recovery algorithm that considers the reuse of control rules,and proves that the algorithm has an approximation ratio of 3 when the control path is deployed in the form of a shortest path tree.The experimental and simulation results demonstrate the effectiveness of the proposed method.
software defined network(SDN)control planein-band control planecontrol pathfault recovery
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