Shulou(Shulou.com)06/01 Report--

Record a troubleshooting of the company's network breakage

It was supposed to be fine on Monday. I had just sat on the station for less than half an hour when the company suddenly cut off the network. at this time, I was a little messy! The following is the process of troubleshooting

1. First of all, I took a look at the IP address of the local computer, disabled startup, and found that the IP address can still be obtained, which means that DHCP distribution is no problem, because it is a sudden network outage, which means that there can be no problem with the switch router configuration.

2, then I entered the computer room with my notebook, looked at the light cat, the light cat status is normal, and then looked at the router, the router is H3C, there is a web management interface, entered the web management interface, found that the IP address status is also normal.

4, then call the company's network operator, he said that there is a problem on their side, there is an IP address repeated, resulting in the reason for not being able to access the network, and then the operator adjusts their things

5. After the operator has finished the adjustment, call me. I will save the router configuration here, then restart the router, connect the laptop directly to the router, and can surf the Internet normally.

6. Then I plugged my notebook into the switch that split down from the router, separated two switches from the router, plugged into the A1 switch to access the Internet, and plugged into the A2 switch to get to the Internet.

7. I rebooted the A2 switch, but it won't work for a moment, and then I'm going to replace the switch (because it's not individual, there are still a lot of switches coming from the A1A2 switch, what we need to do at this time is not to troubleshoot, but to restore the network to normal as soon as possible)

8. I connected my laptop to the new A2 switch, and my laptop operating system is windows. Then I equipped myself with static IP, used ping www.baidu.com-t at the command terminal, connected the new A2 switch to the router, then looked at the terminal's return status and found that it could access the Internet normally, and then plugged in the network cable one by one, after plugging in with the network cable. I found that the ping www.baidu.com suddenly failed, and then I unplugged the network cable so that I could communicate normally, and then I plugged the others one by one and found that there was no problem, but as soon as the cable was plugged in, it was not possible. I suspected that there was a problem with the switch loop.

9. Then I used a line finder to plug in this network cable, asked by the company to see where the network could not be connected, and then I went to which switch, unplugged all the network cables, only plugged in those connected to the computer room, then went to the computer room, plugged in the network cable, and found that I could communicate normally. Then I went to the faulty switch and plugged the notebook into it. Ping Baidu can still be normal. Then I plugged in the network cable one by one, and when I found that there were several roots, I did not go to the network. I checked along those network cables and found that both ends were on a switch, and then unplugged the useless network cables. back to normal!

10, then asked, they saw that there was a network cable on the other side of the switch, and then they happened to cut off the network. They thought the network cable had fallen off, so they plugged it in. At this point, the problem of network outage was solved, which took 34 minutes.

Summary of questions:

1. The switch crashes, loops, and operators' problems occur.

2, loop avoidance method, try to put the switch in the cabinet, and then unplug the unnecessary network cable, do not leave on it

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.