【作者】 洪峰；

【导师】 赵志峰；

【作者基本信息】 浙江大学 ， 信息与通信工程， 2017， 硕士

【摘要】 近年来,数据中心网络的结构不断地发生变化,新的技术也层出不穷。如今的数据中心网络已演变成一个大规模的多租户网络,存在百万级的虚拟机和大量的租户,面临在网络资源有限的情况下既要满足很高的带宽要求,又要应对虚拟机的频繁迁移的多重挑战。本文所研究的基于 SDN(Software Defined Network)的 VXLAN(Virtual eXtensible Local Area Network)就是在这一背景下提出的论文首先介绍了 VXLAN技术的原理和VXLAN用于数据中心网络所面临的虚拟机迁移、负载均衡等问题,并分析了目前解决方案的不足。提出了基于智能SDN的VXLAN架构,引入了智能中心的概念。针对虚拟机迁移问题,在新的架构下,虚拟机能够在迁移过程中与其它虚拟机持续连接并保持数据不丢失。针对负载均衡问题,提出了基于分布式网关框架的解决方案,不需要对硬件进行改动就能够完成自动化的负载均衡工作。通过软件仿真,验证了虚拟机迁移和自动化负载均衡方案的性能。提出了一种基于SDN的VX[LAN转发技术优化方案,利用智能中心的监控模块来实时获取全局拓扑信息并存储在数据库中,利用SDN控制器的集中管理能力对VXLAN网络的转发过程进行优化。通过Mininet仿真比较了不同方案的往返传输时间,验证了该转发方案可以提升数据中心网络的转发性能。更多还原

【Abstract】 In recent years,the structure of the data center network continues to change,new technologies are also emerging.Today’s data center network has evolved into a large multi-tenant network,with millions of virtual machines and a large number of tenants,faced with the limited resources in the network to meet the high bandwidth requirements,but also deal with virtual machine Of the multiple challenges of frequent migration.This paper is based on SDN(Soft Defined Network)VXLAN(Virtual eXtensible Local Area Network)is proposed in this contextFirstly,the paper introduces the principle of VXLAN technology and the problem of VM migration and load balancing for data center network,and analyzes the shortcomings of the current solution.The VXLAN architecture based on intelligent SDN is proposed,and the concept of intelligent center is introduced.For virtual machine migration,under the new architecture,the virtual machine can continue to connect with other virtual machines during the migration process and keep the data from being lost.Aiming at the problem of load balancing,a solution based on distributed gateway framework is proposed,which can accomplish automatic load balancing without hardware modification.The performance of the virtual machine migration and the automatic load balancing scheme was verified by software simulation.An optimization scheme of VXLAN forwarding technology based on SDN is proposed.The global topology information is acquired and stored in the database in real time by the monitoring module of intelligent center.The forwarding process of VXLAN network is optimized by the centralized management capability of SDN controller.The round-trip transmission time of different schemes is compared by Mininet simulation,which proves that the forwarding scheme can improve the forwarding performance of the data center network.更多还原