络是经济时代的基础设施，而城域网是网络中重要的一部分，它为宽带业务提供了安全、可靠、高速的网络环境。随着经济的高速发展，城域网的覆盖范围以及网络容量也在不断扩大，层次架构也越来越复杂，这也增加了城域网管的难度。一个城域网需具有多种网络技术平台，如城域网电 Network is the infrastructure of the economic era, and metropolitan area network is an important part of the network, which provides a safe, reliable, high-speed network environment for broadband services. With the rapid economic development, MAN coverage and network capacity are also expanding, the hierarchy is also more complex, which also increased the difficulty of metro network management. A metropolitan area network needs to have a variety of network technology platforms, such as metro network