【作者】 冯涛；

【导师】 毕军；

【作者基本信息】 清华大学 ， 计算机科学与技术， 2015， 博士

【摘要】 从网络技术的发展趋势看,软件定义网络已经成为促进网络创新和重构网络体系的最重要推动力之一。软件定义网络具有的转发与控制分离、基于全局视图的集中控制等特点,显著提高了网络管理的灵活性和网络资源使用的效率。但是,SDN的开放性也引入了功能服务动态构建、多租户资源调配和混合SDN路由管控等问题,严重制约了SDN网络管理技术的发展。本文归纳总结了SDN管理领域的已有研究成果,对SDN网络管理模型、网络资源调度管理技术和混合SDN路由视图服务技术开展了深入研究,设计实现并现网部署了基于SDN的真实地址验证管理系统和SDN网络资源动态调度管理系统。本文研究内容包括:(1)针对SDN网络管理模型缺乏、网络功能动态组合困难的问题,提出了基于NFV的SDN网络管理框架和管理模型,设计了对等模式的服务功能链构建机制,验证了该模型和机制具有良好的可扩展性和处理时效性。(2)针对SDN资源管理中流表与带宽联合分配和调度效率低的问题,提出了兼顾公平和效率的SDN网络资源联合管理模型和调度算法,设计了SDN虚拟转发空间,通过实际数据评估和原型系统验证了该管理模型和调度算法具有较高的网络利用率和缓冲替换效率,同时能够有效降低网络延时和提升流表命中率。(3)针对混合SDN路由管理中视图构建难的问题,提出了混合SDN路由管理中的路由视图服务技术,设计了开放传统分布式路由平面的Open Route Flow协议,实验证明该协议具有较低的路由状态传输协议负载、路由状态处理负载和路由状态感知延迟。(4)针对传统架构下域内真实地址验证管理系统的接口协议种类复杂、网络状态感知迟缓、过滤效果存在误判、网络功能无法复用等问题,设计并实现了基于SDN的域内真实地址验证管理系统,并在CERNET的25所高校进行了实际部署和功能验证。(5)针对新型网络体系结构下,缺乏为多种异构网络应用提供SDN网络资源动态调度和统一管理的平台等问题,设计并实现了SDN网络资源动态调度管理平台,并在全国13个节点进行了实际部署和功能验证。更多还原

【Abstract】 Along with the development of network technology, Software Defined Network(SDN) has become one of the most important driving force to promote the network innovation and reconstruct network architecture. SDN has the characteristics of the separation between forwarding with controlling, the centralized control based on the global view, which significantly improves the flexibility of the network management and the availability of the network resource. However, the openness of SDN also introduces dynamic orchestration of functional services, resource scheduling for multi-tenant and routing control in hybrid SDN, which seriously restricts the development of SDN network management technologies. This paper summarizes the outcomes of the existing research in this field, and starts an in-depth study on the SDN network management model, network resource management and hybrid SDN routing services. Based on above key technologies, the SDN based address validation system and the dynamic scheduling management system of SDN network resource are implemented and deployed on the real Internet.The research content of this paper includes:(1) For the lack of SDN network management model and the problem of dynamic orchestration of network functions, this paper presents a NFV based SDN network management model and P2 P based orchestration mechanism of network services.Simulation results show this model has better scalability and effectiveness.(2) For the problem of the allocation and scheduling of flowtable and bandwidth in SDN, this paper proposes the joint allocation model and scheduling algorithm of SDN network resource based on efficiency and fairness. According to this model and the algorithm, a SDN virtual forwarding space is designed. With two network traces and a prototype system, the evaluation shows VFS has high bandwidth utilization and flow replacement efficiency.(3) For the problem of the management of routing plane in hybrid SDN, this paper proposes the software defined routing service and the Open Route Flow protocol for the openness of legacy routers. By validating with software updating of commercialrouters to support OpenRoute Flow, the protocol shows lower traffic load, processing load as well as perception delay of routing status.(4) According to a series of problems of the Source Address Validation and Management System(SAVMS) operating in the traditional network, SDN based SAVMS is implemented based on Open Route Flow and deployed in 25 universities of CERNET2. Through the functional validation with the deployment, the system shows lower false positive for filtering address spoofing packets and higher efficiency for computing filtering rules.(5) For the lack of SDN network resource management system, this paper designs and implements a SDN network resource dynamic scheduling and management platform(SDNRMS). The system is deployed in 13 nodes all over the country based on863 projects “future internet innovation environment” to support dynamic scheduling and unified allocation of network resource for a variety of heterogeneous network applications in SDN.更多还原