混合SDN环境中路由关键技术研究

发布时间：2018-02-12 21:55

本文关键词： 软件定义网络路由路径管理负载均衡 OpenFlow Floodlight　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：网络作为至关重要的基础资源,随着需求和规模的急速扩张,一方面促进了网络技术研究人员对于新体系、新技术的研究,另一方面由于现有网络结构日趋复杂以及网络设备相对封闭,使得研究人员几乎无法在当前的网络环境中实验和部署新型网络体系结构及相关网络技术。为了解决现有TCP/IP协议面临的诸多困难,研究人员提出了软件定义网络(Software Defined Network,SDN)的概念,软件定义网络将网络配置能力从嵌入式节点中独立出来,将网络定义为开放式软件驱动的控制器与根据控制器指令进行转发的交换设备的组合。在这种控制转发分离的架构下,整个网络资源可由集中式控制器动态配置和管理。OpenFlow技术作为SDN思想的产物,初步实现了SDN的设计思想。但是由于SDN网络中对网络设备的定义与传统网络全然不同,使得SDN网络无法简单地与传统网络兼容并存,只能在小范围内实验室独立部署和测试,大大阻碍了SDN技术的发展。针对这一问题,本文提出了传统网络和SDN网络混合环境下所需的一些关键技术,并基于开源OpenFlow控制器软件Floodlight,设计并实现了相应的增强型SDN路由系统。本增强型SDN路由系统使得Open Flow区域具备路由功能,可以和外部路由设备进行相关的路由协议交互,使得传统网络和OpenFlow区域可以互联互通,作为路由功能的增强,本文还研究了在OpenFlow区域中如何动态管理流的转发路径,使得整个区域内链路负载尽量均衡,以此来提高网络资源利用率。本文第一、二章介绍了SDN背景以及Open Flow技术基础,第三、四章针对传统网络与软件定义网络混合环境,提出了相应的功能需求以及相关关键技术方案,详细介绍了增强型SDN路由系统的设计方案,第五章通过相应的验证测试证明了该系统能够很好地与传统网络兼容并存。第六章对全文进行了总结并探讨了后续相关工作方向。
[Abstract]:As a vital basic resource, with the rapid expansion of demand and scale, network technology researchers have promoted the research of new system and new technology. On the other hand, due to the increasing complexity of the existing network structure and the relatively closed network equipment, It makes it almost impossible for researchers to experiment and deploy new network architecture and related network technologies in the current network environment. The software defines the network as a combination of an open software-driven controller and a switching device that forwards according to the controller's instructions. The whole network resource can be dynamically configured and managed by centralized controller. OpenFlow technology is the product of SDN idea, and the design idea of SDN is realized preliminarily. However, the definition of network equipment in SDN network is completely different from that of traditional network. The SDN network can not be compatible with the traditional network simply, and can only be deployed and tested independently in a small scale, which greatly hinders the development of SDN technology. In this paper, some key technologies in the hybrid environment of traditional network and SDN network are proposed. Based on the open source OpenFlow controller software Floodlight, a corresponding enhanced SDN routing system is designed and implemented. The enhanced SDN routing system enables the OpenFlow region to have routing functions and can interact with external routing devices. As the enhancement of routing function, this paper also studies how to dynamically manage the forwarding path of the flow in the OpenFlow region so that the link load in the whole area can be balanced as far as possible. In the first and second chapters, the background of SDN and the technical foundation of Open Flow are introduced. The third and fourth chapters focus on the traditional network and software defined network mixed environment. The corresponding functional requirements and related key technical schemes are proposed, and the design scheme of enhanced SDN routing system is introduced in detail. Chapter 5th shows that the system can coexist well with the traditional network through the corresponding verification test. Chapter 6th summarizes the full text and discusses the future work direction.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.05

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