MPLS 与 MPLS-VPN技术白皮书 目 录 一、Mpls简介 .................................................................................................................................. 4 1. 传统 IP 转发 ...................................................................................................................... 4 2. MPLS 转发 ......................................................................................................................... 5 2.1. 简单 MPLS 转发图 ................................................................................................ 6 2.2. 具体转发过程 ........................................................................错误! 未定义书签。 3. MPLS 封装格式与标签位 ............................................................................................... 22 二、LDP 协议原理 ........................................................................................................................... 7 1. LDP 基本概念 ................................................................................................................... 7 2. LDP 的消息类型 ............................................................................................................... 7 3. LDP 的特点 ....................................................................................................................... 8 4. LDP 建立和维护 ............................................................................................................... 8 4.1. LDP 建立 ............................................................................................................... 8 5. LDP 邻居状态机制 ......................................................................................................... 11 6. 标签分发和管理 ............................................................................................................. 14 6.1. 标记分发控制模式 ................................
