Based on the analysis and study of metro carrier Ethernet, this thesis makes an in-depth study on VPN network management system, designs and implements a VPN server.

基于这种需要，本文在对城域电信级以太网分析和研究的基础上，对VPN网管系统作了深入的研究，并设计和实现了VPN系统服务器。

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The Metro Ethernet Forum (MEF) put forward the concept of Carrier Ethernet (ce) to improve Ethernet technology and make it a transmission convergence layer solution for Next Generation Network (NGN).

城域以太网论坛(MEF)提出了电信级以太网(CE)的概念，以改进以太网技术并使之成为下一代网络(NGN)传输汇聚层的解决方案。

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