The company suddenly broken the network troubleshooting

One time to remember the company's fault network troubleshooting

Originally big Monday very good, just sat in the station less than half an hour, the company suddenly broken net, at this time, I was a bit messy ! below is the process of troubleshooting

1, first I look at the IP address of the computer , disable the boot, found still can obtain the IP address, which represents the DHCP Distribution is no problem, because the network is suddenly broken, representing the switch router configuration can not be a problem

2, then I took a notebook into the computer room, saw the light cat, light cat State Normal, and then looked at the next router, the router is h3c , has a Web management interface, into the web Management interface, it is also normal to find the IP address status.

4, and then to the company's network operators to call, he said it is their side of the problem, there is an IP address duplication, causing the emergence of the cause of the network, and then operators adjust their things

5, the operator after the adjustment, call me, my side to save the router configuration, and then restart the router, the notebook directly connected to the top of the router, the normal internet

6, then I inserted the notebook on the switch from the router down to the top, from the router out of two switches, plugged in the A1 switch above the internet, plugged in the A2 switch above the network

7, I restarted the A2 switch, wait a moment or not, then I am going to replace the switch ( because it is not individual, from the A1 A2 Switch to go down, or there are many switches, at this time to do, not the wrong, but as soon as possible to restore the network normal )

8, I connect my notebook to the new A2 switch, my notebook OS is Windows , then I give myself a static IP , used at the command terminal Ping www.baidu.com- T, then the new A2 switch with the router to connect, and then look at the terminal back to the status, found that the normal Internet, and then the network cable a root plug up, with a network cable inserted after, found Ping www.baidu.com suddenly not pass, then I will that cable unplug, can normal communication, and then I will plug in the other, found no problem, but this line plug up, not, a switch loop problem is suspected

9, then I use the Finder, in this cable plug up, in the company asked the next, to see which place on the net, and then I to which switch, will all unplug the network cable, and then go to the computer room, will be plugged into the network, found to be normal communication, and then I went to a faulty switch next to the will be inserted into the notebook,ping Baidu can still normal, and then I will wire a root of the plug up, in the check to have a few root when, appear on the network condition, along that several cable troubleshooting, found both ends in a switch top, Then the few useless cable unplugged, back to normal !

Ten, and then asked, is that they see the switch over there cable head, and then happened to break the net, they think it is the cable dropped, and plug it up ... To this, the problem solved the network, lasted : minutes ...

Summary of issues :

1, there is a switch panic phenomenon, loop phenomenon, operator problems

2, loop to avoid the method, try to put the switch in the cupboard, and then unplug the unnecessary cable, do not stay on the top

This article is from the "Bucket Month" blog, please be sure to keep this source http://douyue.blog.51cto.com/10174393/1737959

The company suddenly broken the network troubleshooting