第 7 章 中低端 Lanswitch 故障排除..........................................................................................2937.1 物理层故障...................................................................................................................2937.1.1 物理层故障排除综述...........................................................................................2937.1.2 常用物理层相关命令...........................................................................................2947.1.3 S3026E 光模块类型错误导致互通问题................................................................2967.1.4 由于协议转换器不能透传 1518 字节以上报文导致无法访问网页..........................2987.1.5 由于交换机下挂光电转换器工作异常导致网络广播风暴的问题定位及处理...........3007.2 端口协商以及自环问题..................................................................................................3017.2.1 端口协商以及自环故障排除综述..........................................................................3017.2.2 常用的端口配置命令...........................................................................................3017.2.3 环路问题导致用户上网异常................................................................................3037.2.4 端口协商问题导致 S3026 光模块无法正常工作....................................................3047.2.5 物理链路存在环路造成业务异常..........................................................................3057.3 VLAN 问题....................................................................................................................3067.3.1 VLAN 故障排除综述............................................................................................3067.3.2 VLAN 配置问题导致用户无法上网.......................................................................3097.3.3 友商交换机三层接口问题导致与 S6506 互通中断................................................3117.3.4 VLAN TRUNK 配置不正确导致业务不通.............
