Troubleshooting and Interfacing Problem in WAN Aggregation Router

This a case study on a Cisco router. There are various types of Cisco router like Branch router , WAN Aggregation router, Edge routers,AP (Access Points), Wireless router , Virtual routers and many more. The WAN Aggregation router is studied in this case study. As per the issue in the router, the gig port 0/0 is not working as it is not showing any type of indication. The interface between the router and laptop is done via console cable then a similar interface is done on a gig port. A putty terminal is used for the troubleshooting the commands on a router. On the console screen the version of the IOS is checked (the image is checked) , the internal fan speed and the temperature is also checked but there was no discrepancies in the result.Then the router is checked with multiple cables still there was no indication at the gig 0/0 port. Then the router was requested for a replacement as it was declared faulty.本案例研究围绕思科（Cisco）路由器展开。思科路由器品类丰富，涵盖分支路由器、广域网（Wide Area Network，WAN）聚合路由器、边缘路由器、无线接入点（Access Points，AP）、无线路由器、虚拟路由器等诸多类型，本案例的研究对象为WAN聚合路由器。该路由器的千兆端口0/0无法正常工作，无任何指示灯信号输出。首先通过控制台线缆建立路由器与笔记本电脑的通信连接，随后针对千兆端口开展了同类连接验证。本次排障过程采用PuTTY终端执行路由器相关命令，在控制台界面中首先检查了IOS系统版本（镜像文件状态），同时对设备内部风扇转速与运行温度进行了检测，各项结果均无异常。随后更换多根线缆进行测试，但千兆端口0/0仍无任何指示灯信号。最终该路由器被判定为故障设备，申请予以更换。