软件定义网络中操作成本优化的控制路径恢复

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。

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 availability 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.