基于路径标签的软件定义网络一致性检测方案

Path label-based consistency detection scheme for SDN

软件定义网络(SDN)相比传统网络虽然更加灵活开放,但控制与数据平面分离的架构可能会引入策略不一致的问题,造成数据包错误的转发行为。对导致控制-数据平面出现不一致问题的原因进行研究,提出了一种基于路径标签的一致性检测方案,通过对数据包头添加路径标签,并在控制器对路径标签信息进行正确性验证,实现对数据流转发行为的实时检测。同时设计了一种故障定位算法,定位出现不一致现象的故障交换机。最后,使用Mininet和ONOS控制器进行仿真实验,实验结果表明该方案可以有效检测及定位数据平面产生不一致转发行为的节点,同时仅引入了小于10%的平均转发延迟。

Software defined network(SDN) is more flexible and open than the traditional network, but the architecture of SDN which separates the control plane from the data plane may have the problem of inconsistent policies, and this problem results in wrong packets forwarding behaviors. Studying the reasons that lead to the inconsistency of control-data plane, and proposes a consistency detection scheme based on path labels. By adding path labels to the packet header and verifying the correctness of the path label information on the controller, the real-time detection of flow forwarding behaviors can be realized. At the same time, a fault location algorithm is designed to locate the faulty switch with inconsistency. At the end, used Mininet and ONOS controller to perform experiments. The experimental results show that our scheme can effectively detect and locate nodes that have inconsistent forwarding behaviors in the data plane, while only introducing an average forwarding delay of less than 10%.