SDN网络系统扩展策略设计与实现

发布时间：2018-05-03 00:08

本文选题：SDN + 分布式架构　；参考：《山东大学》2017年硕士论文

【摘要】：通信业务IT化趋势驱动了通信业务服务系统的体系结构变革的需求。传统核心网系统主要采用"集中式"体系结构,通过"分域扩展"等机制支持用户规模伸缩性,通过物理备份设计实现容灾等可用性特征,存在服务系统初期建设成本高、运维成本高等不足,随着NFV(Network Function Virtualization,网络功能虚拟化)、云计算等技术日益成熟,采用分布式技术构建通信业务服务系统已成为运营商业务系统建设的新方向。本文结合中国移动"融合通信协议优化和云化研究"项目验证系统开发需求,设计基于SDN中继(MQTT)(Message Queuing Telemetry Transport,消息队列遥测传输)协议的通信服务分布式架构。软件定义网络(Software Defined Networking,SDN)的 OpenFlow 设计之初主要是为了校园网开发人员设计的创新网络架构提供真实可靠地的实验平台,形成一种新的网络构架SDN。随着其应用范围的扩大,遇到的问题逐渐表现出来,尤其是可扩展性方面。文中介绍了 SDN控制器模型和控制平面框架,并对SDN可扩展性出现的问题及解决方法进行了分析,并综述了其以后的发展方向。本文解决的主要问题如下:1.设计了 SDN网络环境下会话类业务功能架构和典型业务逻辑流程。2.针对分布式环境下对集群内SDN中继控制器集群中各个控制器状态的一致性,提出了一种采用paxos算法基于Zookeeper集群架构的服务器状态一致性存储方案。3.基于SDN实时会话业务特点,设计了一种基于RPC机制的SDN中继器路由转发模式。4.基于SDN实时会话业务的特点,提出了一种新的基于反馈机制的负载均衡算法。测试结果表明,本文设计实现的基于SDN网络环境下的会话类业务各项功能和运行效果满足了项目应用需求,可以稳定地支持大数据量、高并发的连接需求。
[Abstract]:The trend of IT in communication service drives the requirement of architecture change of communication service system. The traditional core network system mainly adopts the "centralized" architecture, supports the scalability of the user scale through such mechanisms as "domain extension", and realizes the availability characteristics of disaster recovery through physical backup design. The initial construction cost of the service system is high. With the development of NFV(Network Function Virtualization, Network function Virtualization, cloud computing and so on, it has become a new direction to construct communication service system by using distributed technology. In this paper, we design a distributed architecture of communication service based on SDN relay, MQTT, message queue, message queue telemetry and transmission), according to the requirement of verification system of China Mobile's "Fusion Communication Protocol Optimization and Cloud Research" project. At the beginning of the OpenFlow design of Software Defined networking (SDN), the main purpose was to provide a real and reliable experimental platform for the innovative network architecture designed by campus network developers, and to form a new network architecture SDN. With the expansion of its scope of application, the problems encountered gradually show up, especially in the aspect of scalability. This paper introduces the SDN controller model and control plane framework, analyzes the problems and solutions of SDN extensibility, and summarizes its future development direction. The main problems solved in this paper are as follows: 1. This paper designs the SDN network environment session class business function architecture and typical business logic flow. 2. 2. Aiming at the consistency of the state of each controller in the cluster of SDN relay controllers in a distributed environment, a storage scheme of server state consistency based on Zookeeper cluster architecture using paxos algorithm is proposed. Based on the characteristics of SDN real-time session service, a SDN repeater routing and forwarding mode based on RPC mechanism is designed. Based on the characteristics of SDN real-time session service, a new load balancing algorithm based on feedback mechanism is proposed. The test results show that the functions and running effects of the session services designed and implemented in this paper based on the SDN network environment can meet the requirements of the project application and can support the large amount of data stably and the high concurrent connection requirements.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.0

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