介绍利用SDH设备传送以太网业务时，ZXONM E300网管的配置流程，并以ZXMP S320设备SFE4板组成的网络实例为基础，说明虚拟局域网业务的详细配置方法。-Introducing the use of SDH transmission equipment Ethernet service, ZXONM E300 network configuration processes, and network equipment SFE4 instances ZXMP S320 plates a