电信级以太网环网技术的研究

IP业务的快速发展使得网络中的业务流量逐渐从以时分复用（TDM）为主向以分组数据业务为主转换。为了适应这一转变，人们将低成本的以太网技术引入城域网络中，同时采用环网控制协议进行环形组网，利用环网保护技术来实现电信网络要求的可管理性及可靠性。ITU—TG．8032给出了以太环网的组网目标及定义，规范了电信级以太网（CE）环网技术。以太网环网保护技术（ERP）及弹性分组环技术（RPR）为两种不同的环网保护技术，而传送多协议标签交换（T—MPLS）网络中采用丁M—SPRing技术实现环网保护。运营商可以根据需求进行扩展，部署合适的环网技术，来满足电信级的要求。

Ring Network Technology for Carrier Ethernet

Along with the continuous development of IP services,the traffic flow in the network is gradually changing from Time Division Multiplexing(TDM) to packet data service.In this situation,low cost Ethernet technology is introduced into metropolitan network.Ring network control protocol is also adopted for ring networking.Ring network protection technologies are applied to guarantee the manageability and reliability of telecom network.Ethernet ring network objectives are defined in the protocol draft ITU-T G.8032,and Carrier Ethernet(CE) ring technology is also standardized.Ethernet Ring Protection(ERP) and Resilient Packet Ring(RPR) technologies are two different traditional ring network protection technologies,while TM-SPRing technology is the ring network protection technology for Transport-Multi Protocol Label Switching(T-MPLS) network.Telecom operators could expand according to their requirements and deploy suitable ring network technology to achieve the carrier class demands.