【毕业论文】IPv6组播路由协议的研究.doc

Abstract 摘要 PAGE 28 PAGE I 摘要 组播是下一代网络不可缺少的关键技术，可有效提高流媒体传输效率，越来越多地应用在网络多媒体业务中。PIM(Protocol Independent Multicast)是一种不依赖于特定单播路由协议的组播路由协议，现已成为事实上的域内标准组播路由协议。分析和研究网络协议多采用网络模拟器，NS2（Network Simulator Version 2）是一个理想的网络模拟软件，它可以进行各种网络协议仿真，并带有大量协议库。本文从IPv6网络的各种组播技术入手，介绍了当前在实际网络中获得广泛应用的基于协议无关（PIM）的组播路由技术，分析了NS2整体结构及其主要组件的实现规则和功能，进而设计了组播网络仿真模型，并编写了在NS2中实现了各组播路由协议的大量Otcl及C++代码，成功模拟了各组播协议运行过程。在此基础上，分析了仿真文件格式，编写了提取性能参数的awk代码，对比分析了不同的稀疏模式组播路由协议对网络性能的影响，根据分析结果，针对不同组播路由协议适合应用的实际网络环境这一问题得出结论。 关键词：组播 协议无关组播协议 网络模拟 NS2 IPv6组播协议原理研究 PAGE 29 Abstract Multicast has become an indispensable technology of the next generation of Internet,which helps to obtain a higher transmitting efficiency of the streaming media, and it will be used more and more in the service of multimedia. PIM(Protocol Independent Multicast)has become the inter-domain standard of multicast routing protocol,which is independent of specifical unicast routing protocol. Network simulator is used to analyse and research network protocols.NS2（Network Simulator Version 2）is an ideal software of network simulation,which can finish any protocol simulation with large protocol libraries.Starting from the introduction of the various kinds of multicast technologies in IPv6 network ,this article describes in details the multicast routing technology of the Protocol Independent Multicast(PIM). Subsequently,analyse NS2 structure,the main objects and functions.And then,simulation scheme are designed for the multicast routing protocol,write many Otcl and C++ codes for the multicast routing protocols in NS2 and successfully simulates the operation of the multicast routing protocols. On the basis of operation,trace format is analysed and write awk codes to get network performance parameter, analyse the performance influence by the various kinds of Protocol