基于MPLS的VPN技术原理及其实现

文档编号:TX176  文档字数:14920,页数:40

 摘 要
多协议标签交换MPLS（Multi-protocol Label Switch）吸收了ATM的VPI CI交换的一些思想，无缝地集成了IP路由技术的灵活性和2层交换的简捷性，在面向无连接的IP网络中增加了MPLS面向连接的属性。通过采用MPLS建立“虚连接”的方法，为IP网增加了一些管理和运营的手段。随着网络技术的迅速发展，MPLS应用也逐步转向MPLS VPN。IP网中，在解决企业互连，提供各种新业务方面，MPLS VPN也越来越被运营商看好，成为在IP网络运营商提供增值业务的重要手段。由于MPLS VPN的应用越来越多，从现在的发展趋势看，它很可能成为最主要的VPN技术，因此有着重要的研究价值。
本文首先对MPLS PN实现的可行性及步骤设计进行了分析介绍，然后对各个功能模块进行了设置调试，最后进行组装测试。最后介绍了使用CISCO路由器，进行MPLS PN接入的设置方法和步骤。

关键词：虚拟专用网 多协议标签交换  边界网关协议  路由器 

Abstract
MPLS (Multi-protocol Label Switching) seamlessly integrates the routing technology of IP and the flexibility of two layers of simple exchanges by absorbing some ideas of the ATM VPI exchanges, which also increases the MPLS connection-oriented properties in the connectionless-oriented IP networks. MPLS has added some managements and means of operations to IP network through the establishment of the "virtual connection". As the rapid technological development of the network, and the application of MPLS gradually shifted to MPLS VPN. In the IP network, MPLS VPN also has been showed its great functions to the operators, which can resolve interconnections of the enterprises and provide a wide range of new business, so the operators increasingly attach more and more importance to it, which has been the central means of important value-added business in the IP network. Since the applications of MPLS VPN become more and more broadly, and from the current development trend which is likely to become the dominant VPN technology. And therefore it will have a promising future in the field of the network research.
Firstly the feasibility and design of MPLS VPN was analyzed and introduced in the paper. Secondly all of the modules for configuration and testing for final assembly and testing were expatiated. Finally, the methods and steps of MPLS VPN access by using of Cisco router were expatiated.

Keywords：VPN, MPLS, BGP, Router

目 录
摘 要  I
Abstract  II
目 录   III
前 言   1
1 MPLS VPN概述   3
1.1 MPLS技术   3
1.1.1 MPLS提出的意义   3
1.1.2 MPLS技术的实现   3
1.1.3标签的分配和分发  5
1.1.4 MPLS的标准化进展   8
1.2相关协议   9
1.2.1 BGP介绍   9
1.2.2 OSPF路由协议   15
1.3 VPN的发展  18
1.3.1传统VPN   19
1.3.2基于MPLS的VPN技术    21
2  MPLS VPN技术原理   24
2. 1 MPLS PN体系结构 24
21.1 PE路由器的改造和VRF的导入  24
2.1.2 MP-BGP协议对VPN用户路由的发布  25
2.2 MPLS PN中标签分组的转发   26
3  MPLS PN配置实例  28
总 结  37
致 谢 38
参考文献   39

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