本文主要是从电信运营商角度对传统IP城域网进行改造,建立MPLS域;设计P/PE/CE设备之间运行的协议和城域中网流量分担和网络备份的方法。 This article is mainly from the perspective of telecom operators to transform the traditional IP MAN, the establishment of MPLS domain; design of P / PE / CE equipment running between the agreement and the metro network traffic sharing and network backup methods.