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一、运营级以太网的基本要求近年来,以太网各种技术的逐步完善使其有望走出局域网的狭小空间而进入城域网甚至广域网这样的大规模、长距离的网络建设中。“运营级以太网”的概念由此提出。一般认为,运营级以太网至少具备五个特点:第一,扩展性,需要有EVC(虚电路仿真)的支持;第二,保护性,可以提供50ms以下的全网保护;第三,硬性的SLA(服务等级协议);第四,TDM的支持,在以太网上提供电路的虚拟服务,这样可以和旧的
First, the basic requirements of carrier-class Ethernet In recent years, the gradual improvement of various Ethernet technologies make it is expected to go out of the small area of the LAN into the MAN and even WAN such large-scale, long-distance network construction. The concept of “Carrier Ethernet” came out. Generally believed that Carrier Ethernet has at least five characteristics: First, scalability, the need for EVC (virtual circuit simulation) support; Second, the protection, can provide the entire network protection of 50ms or less; Third, the rigid SLA (service level agreement); Fourth, the support of TDM, provides the virtual service of the circuit on Ethernet, like this and old