【作者】 周欢；

【导师】 戴居丰；

【作者基本信息】 天津大学 ， 通信与信息系统， 2007， 硕士

【摘要】 由于网络传输技术和流媒体技术的成熟,通过高速互联网提供电视服务(IPTV)正在成为现实。为了解决IPTV组播的服务质量问题,迫切需要高效传输方案,MPLS(多协议标记交换)技术成为理想解决方案。MPLS将三层IP技术和二层交换技术结合在一起,传输中只处理一个定长的标签,在无连接的网络中引入连接模式,提供IP业务时能确保服务质量。MPLS不但支持流量工程,也是当前最有前景的VPN的主要实现技术,因此如何实现MPLS组播业务传输成为研究的热点,而且具备实际的应用需求。本文对MPLS组播进行了研究,并在此基础上设计了一对多模型来解决IPTV组播流对网络传输带来的压力,即点到多点(P2MP)方案。本文从IPTV业务类型入手,分析了承载网的组播需求;接着介绍了MPLS组播框架,提出了适合IPTV业务的组播流量工程,分析得出新的MPLS组播流量工程方案——点到多点标签转发路径(P2MP LSP)。本文研究重点是如何在RSVP协议基础上扩展支持P2MP LSP,即建立点到多点标签转发路径实现流量转发,其中包括:对当前可预留资源的标记分配机制的改进,提出了基于RSVP协议的点到多点标签分发机制;研究了具有流量工程的消息处理机制;讨论了在链路失效与链路恢复时,点到多点组播树的快速重路由方案,从而增强组播标签转发路径的可靠性、提高协议的信令能力。本文使用标准C语言,在VxWorks嵌入式操作系统的集成开发环境Tornado下,开发RSVP-TE的P2MP模块,实现P2MP隧道建立,实现单播和组播在MPLS网络中的单一信令协议控制。更多还原

【Abstract】 With the development of network transmission and the popularity of multi-media technology, IPTV is thought to be a Potential service. There is expected high reliable method to solve the problem of IPTV multicast and satisfy its Quality of Service (QoS). MPLS (Multi-protocol Label Switching), which combines L2 switching and L3 routing data transmission using only a certain byte Label in connection mode under connectionless network to make sure the QoS of the IP service, would be an ideal solution. MPLS not only support traffic engineering but also main technology of VPN. So how to realize MPLS Multicast is considered as the key technology of the network system.In this paper, we do some researches on the technology of MPLS multicast and design a solution to solve the problem of IPTV multicast transmission, which is called point-to-multipoint. Firstly, by considering the type of IPTV business, we analyze the demand of carried-grade multicast. Secondly, on the basis of MPLS multicast framework, Multicast traffic engineering (TE) which is perfect fit for IPTV service is proposed, and form point to multipoint label switching solution.How to support P2MP LSP using RSVP protocol is the important in this paper. It is discussed as follows: improve resource reservation protocol (RSVP) in label distribution, from one ingress port to many egress ports, discuss the mechanism of message processing with traffic engineering, propose the method of fast reroute that is a useful method when the failure happens.We use standard C language, implemente RSVP-Te P2MP program, realize P2MP tunnel under MPLS network, implement one signal protocol processes unicast and multicast in MPLS networks, which is integrated development environment of the VxWorks embedded operation system.更多还原