基于SDN的园区网QoS技术研究与应用

发布时间：2018-01-10 06:13

本文关键词：基于SDN的园区网QoS技术研究与应用　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：计算机网络最初设计的目标,只是实现单纯的端到端数据传送,发展至今的互联网,几乎所有的流量都是建立在TCP/IP架构之上,尽管设备性能有了飞跃性的提高,但网络本身的架构却没有突破性的变化。然而,随着网络中数据量级的飞速增大,传统的尽力而为路由转发的网络体系,越来越难以满足日益出现的新需求,服务质量(Qualityof Service,QoS)在可靠性、有效性、可扩展性等技术与非技术方面亟需改善,针对数据包级的流量区分服务更是受到了硬件资源的限制,而其改进往往都是在进行"打补丁"般的被动修补,而非系统性解决方案,这从未来的发展来看无疑是饮鸩止渴。因此,本文在软件定义网络(Software Defined Network,SDN)这个具有极高管控权的架构中,对网络的QoS保障进行了研究与应用。针对当前SDN架构中还没有成系统的QoS管控体系,在综合考虑SDN发展现状、OpenFlow协议与用户对QoS管理需求的基础上,本文结合研究传统网络体系中的区分服务模型(Differentiated Service,DiffServ)的QoS技术,基于支持OpenFlow协议规范的Floodlight控制器,设计并实现了一套QoS子系统,将区分服务模型应用在了 SDN网络环境中。在介绍了该课题的国内外相关研究现状并对SDN架构、OpenFlow协议和QoS技术中的区分服务模型做出了研究分析后,本文提出了对QoS系统的功能与非功能需求分析。其后,对实现需求所要用到的控制转发平面中的Floodlight控制器和OpenvSwitch交换机的主要核心模块结构进行了透彻解析,并设计了 QoS系统的整体框架。最后根据框架设计,实现了一套拥有端口队列管理、服务类型管理、数据流分类标记和区分服务入队策略四大组件的QoS子系统。在详细阐述了其设计思想与具体实现方案后,搭建了 SDN环境下的实验平台,对比需求分析,通过实验验证了该系统能显著提高网络中数据流量的服务质量。
[Abstract]:The goal of the initial design of computer network is to realize the pure end-to-end data transmission. Almost all the traffic is based on the TCP/IP architecture. Although the performance of the device has been improved by leaps and bounds, the architecture of the network itself has not made a breakthrough change. However, with the rapid increase of the data level in the network, the traditional network architecture of best effort routing and forwarding. It is becoming more and more difficult to meet the new demand. The quality of Service QoS (QoS) needs to be improved in terms of reliability, effectiveness, scalability and other technical and non-technical aspects. Packet level traffic differentiation services are limited by hardware resources, and their improvements are often "patched" as passive fixes, rather than systemic solutions. This is undoubtedly from the future development is drinking poison to quench thirst. Therefore, this paper defines the network software Defined Network. SDN), which has the extremely high control power, has carried on the research and the application to the network QoS safeguard. Aiming at the current SDN architecture, there is no systematic QoS management and control system. On the basis of considering the current situation of SDN development, the OpenFlow protocol and the user's requirement for QoS management are considered. This paper studies the QoS technology of differentiated Service DiffServ (DiffServ) in traditional network architecture. Based on the Floodlight controller which supports OpenFlow protocol specification, a set of QoS subsystem is designed and implemented. The differentiated service model is applied to the SDN network environment. In this paper, the domestic and foreign research status of this topic and the SDN architecture are introduced. After the research and analysis of the OpenFlow protocol and the differentiated service model in QoS technology, the functional and non-functional requirements of the QoS system are analyzed in this paper. The Floodlight controller in the control and forwarding plane and the main core module structure of the OpenvSwitch switch are analyzed thoroughly. Finally, according to the framework design, a set of port queue management and service type management are implemented. The QoS subsystem of the four components of data stream classification marking and differentiated service joining strategy. After the detailed elaboration of its design idea and concrete implementation scheme, the experimental platform under the SDN environment is built. Compared with the requirement analysis, it is proved that the system can improve the quality of service of the data traffic in the network.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.09

【参考文献】