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。
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).
公司所需要的是城域以太网的架构加上上SONET的弹性，但要具有适合基于分组服务的网络高效率。
What companies need is a metropolitan Ethernet architecture with the resiliency of SONET but with significant network efficiencies for packet-based services.
在本文中，笔者首先对已有IP组播控制技术分析，针对城域以太网的二层网络对IP组播控制技术进行研究。
This will cause multicast service deployed more difficulty on Metro-E network. In this paper, I analyze and study IP multicast control technology on L2 Metro-E network.
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