基于QoS在VPN应用中的研究与仿真【摘要】根据多协议标签交换（MPLS）技术的VPN业务能够在各类虚拟专用网络中广泛运用，从而保证各类网络业务可以把各种各样的数据业务进行有效的分隔。便于人们获得集成数据，还兼具语音和视频这两大功能。但是多协议标签交换技术的VPN业务运用到网络中后出现了QoS和安全问题，下面本篇论文将会对QoS问题进行全面而具体的研讨。进一步探讨MPLSVPN报文转发，差异化服务模型以及MPLSVPN支持QoS，由此得出了这一问题的解决措施。此措施包括引入差分业务的MPLSVPN结构，还参照了客户边缘CE路由器的QoS的设计理念，而且还效仿了运营商PE路由器在QoS中的设计灵感。在实施此措施时，让DSCP首先经由MPLS标签中的EXP字段，然后再使其映射到EXP字段，DiffServ信息携带在MPLS包头中。本文使用OPNET模拟器来验证所提出的措施。集成MPLS和差异化服务可以为用户提供更好的端到端QoS服务。【关键词】MPLS；VPN；QoS；区分服务；OPNET目录1.绪论......................................................................................................................................11.1QoS的存在意义..........................................................................................................11.2QoS的研究背景..........................................................................................................11.3论文的主要研究工作...................................................................................................12.IPQoS的技术内涵............................................................................................................22.1IPQoS的参数...............................................................................................................22.2IPQoS参数说明......................................................................................................2**2.3使用IPQoS的优点.....................................................................................................22.4QoS的三种模型..........................................................................................................22.5DiffServ概述................................................................................................................12.6QoS的技术综述..........................................................................................................32.6IPQoS需要解决的问题..............................................................................................32.7本章小结......................................................................................................................33VPN的技术内涵...................................................................................................................43.1VPN技术与概念...........................................................................................................43.2QoSVPN的好处.........................................................................................................43.3MPLSVPN对QoS的支持......................................................................................53.4MPLSVPN报文转发过程..........................................................................................53.5本章小结......................................................................................................................64MPLSVPN中QoS设计.....................................................................................................74.1MPLSVPN中哪里需要设计QoS..............................................
