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Generic Validation Criteria and Methodologies for SDN Applications

机译:SDN应用的通用验证标准和方法

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Programmable control plane in software-defined networking (SDN), plays an essential role in the SDN architecture. The network function provided by the specialized hardware in a legacy network can be created in the form of software-based "SDN application" running on the controllers to manipulate entire network configurations. Therefore, the risk of having software bugs and errors in the SDN applications may threaten the normal operations of SDN networks. This paper presents systematic validation criteria and test cases based on the proposed novel methodologies for SDN application testing. The test framework can perform testbed build-up, generate desired packet sequences, and analyze results automatically. According to the results of a generic test suite, several issues are unveiled in the application under test (AUT). Some AUTs, which need to check all the incoming packets from Open-Flow switches, fail to meet the test criteria of burst packet-in and flow self-recycling. For most of the applications based on the Ryu controller, the evaluation results reveal that some are unable to recycle flow entries after they are unloaded. It is recommended that all flows populated by SDN applications must have timeout value specified to prevent unnecessary entries kept in the flow table.
机译:软件定义网络(SDN)中的可编程控制平面在SDN体系结构中起着至关重要的作用。可以以运行在控制器上的基于软件的“ SDN应用程序”的形式创建由遗留网络中的专用硬件提供的网络功能,以操纵整个网络配置。因此,在SDN应用程序中存在软件错误和错误的风险可能会威胁SDN网络的正常运行。本文基于提出的用于SDN应用程序测试的新颖方法,提出了系统的验证标准和测试案例。测试框架可以执行测试平台构建,生成所需的数据包序列并自动分析结果。根据通用测试套件的结果,被测应用程序(AUT)中出现了一些问题。一些AUT需要检查来自开放流交换机的所有传入数据包,但无法满足突发数据包输入和流自回收的测试标准。对于大多数基于Ryu控制器的应用程序,评估结果表明,有些应用程序在卸载后无法回收流条目。建议为SDN应用程序填充的所有流都必须指定超时值,以防止流表中保留不必要的条目。

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