面向软件定义广域网的路径可编程性保障研究综述  

A Survey of Maintaining the Path Programmability in Software-Defined Wide Area Networks

作　　者：郭泽华 窦松石 齐力 兰巨龙[3] GUO Zehua;DOU Songshi;QI Li;LAN Julong(Beijing Institute of Technology,Beijing 100081,China;Key Laboratory of Intelligent Control and Decision of Complex Systems,Beijing 100081,China;National Digital Switching System Engineering&Technological Research Center,Zhengzhou 450002,China)

机构地区：[1]北京理工大学,北京100081 [2]复杂系统智能控制与决策教育部重点实验室,北京100081 [3]国家数字交换系统工程技术研究中心,郑州450002

出　　处：《电子与信息学报》2023年第5期1899-1910,共12页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(62002019);北京理工大学青年教师学术启动计划;国家重点研发计划(2021YFB1714800)。

摘　　要：软件定义网络(SDN)被誉为下一代网络的关键技术。近年来,SDN已经成为学术界与工业界的热点。广域网是SDN应用到工业界的一个重要的场景。基于SDN的广域网被称为软件定义广域网(SD-WAN)。在SDWAN中,SDN控制器通过控制流转发路径上的SDN交换机来实现流的路径可编程性。然而,控制器失效是SDWAN中一种常见的现象。当控制器失效时,流转发路径上的交换机会失去控制,流的路径可编程性将无法得到保障,从而无法实现对网络流量的灵活调度,导致网络性能下降。该文对SD-WAN控制器失效场景下保证路径可编程性的研究工作进行了综述。该文首先阐述了当控制器失效时,SD-WAN中路径可编程性保障研究的背景及意义。随后,在查阅分析了国内外相关文献的基础上,介绍了当前在控制器失效时SD-WAN对交换机的主流控制方案。最后,对现有研究成果可能的进一步提高之处进行了总结,并对此研究的未来发展与研究前景进行了展望。Software-Defined Networking(SDN)is the key technique of the next-generation network.Recently,SDN has become a hot spot in both academia and industry.Wide Area Network(WAN)is one of the primary application scenarios in the industry for SDN,which is known as Software-Defined WAN(SD-WAN).In SDWAN,flexible traffic scheduling and network performance improvement are realized by the flow path programmability,which is enabled by the SDN controller to change dynamically the paths of flows traversing SDN switches.However,controller failure is a common phenomenon.When the controller fails,the switches controlled by the failed controller become offline,and the flows traversing the offline switches become offline too.In this way,the path programmability can not be guaranteed,and thus flexible flow control becomes invalid,leading to severe network performance degradation.This survey is presented to introduce the research works on maintaining path programmability in SD-WAN.First,the path programmability and the important feature for maintaining the path programmability in SD-WAN are introduced.Second,different types of existing solutions for coping with the controller failure in SD-WAN are proposed.Finally,potential improvements and future directions on this research topic are proposed.

关 键 词：软件定义网络 广域网 路径可编程性 

分 类 号：TN929.5[电子电信—通信与信息系统] TP393[电子电信—信息与通信工程]