一、电信级以太网的定义及技术类别随着通信业务IP化的不断深入,数据、语音和视频在IP网上的承载面临日益严峻的挑战。尤其在IP城域网的二层平面,广泛应用的以太网技术如何适应多业务承载的新需求,成为运营商和各大设备商高度关注的课题。在这个背景下,电信级以太网应运而生。采用电信级以太网的一个根本目的是,把以太网应用从局域网的范围延伸到城域网甚至广域网的范畴。从技术上讲,所谓电信级以太网,就是在保留传统以太网的帧结构的基础上,通过扩展帧头和引入二层信令,在以太网上实现与电信网类似的可管理性和高可靠性。根据ITU- T和MEF(城域以太网论坛)的定义,电信级以太网应具备以下特征: First, the definition of Carrier Ethernet and technology categories With the deepening of IP communications services, data, voice and video bearer in the IP network is facing increasingly serious challenges. Especially in the second floor of the IP MAN, how to adapt widely used Ethernet technologies to the new demands of multi-service bearer has become a topic of great concern to operators and major equipment manufacturers. In this context, Carrier Ethernet came into being. One of the fundamental goals of adopting carrier grade Ethernet is to extend the scope of Ethernet applications from LAN to MAN and even WAN. Technically, the so-called Carrier Ethernet, is to retain the traditional Ethernet frame structure, based on the extension of the frame header and the introduction of the second floor of the signaling on the Ethernet network to achieve similar manageability and high reliability Sex. According to ITU-T and MEF (Metro Ethernet Forum), Carrier Ethernet should have the following features: