摘要
基于MPLS的VPN由于其所具有的灵活性、安全性和可扩展性，在各大ISP运营商得到了大规模的部署。本文结合作者的多年工作经验，深入浅出地描述了域内及域间三层MPLSVPN实现方案各自的特点及其标签分配方式。
MPLS VPN have received a lot of attention from service providers an large enterprises due to their flexibility, security and scalability .This article deeply analyses the theory about Intra-As and Inter-AS MPLS VPN.
