Find the root cause: Solve the Problem of switch congestion

Find the root cause: Solve the Problem of switch blocking. Recently, the switch blocking has been favored by many friends. Let's take a deeper look at the problem of switch blocking today! We are surprised that the Network Worm rate switch is blocked, and the new experience is waiting for you.

The network is too slow. The source switch is blocked.

When the network scale is relatively large, the "load" of switches that shoulder network data forwarding, content filtering, and management control tasks will be very heavy. In addition, like a person's health, after a switch is overloaded for a long time, its health is also prone to switch congestion problems, and the switch is unresponsive, serious hardware damage can occur directly, which may affect the running status of the entire network.

This is not the case. I have an ordinary switch on the network of my building, which has been quietly working for the building users for many years. It has always been "Serving" us around the clock ". However, recently, many computer switches in the building network are blocked and cannot access the Internet. The fault has been carefully checked by the network administrator.

It was found that this common switch had an accident, and all its signal lights were flashing constantly. Considering that such a failure was universal, the detailed troubleshooting process of the switch is restored below, so as to help you solve the fault more efficiently!

The Network Worm rate switch is blocked.

A friend of the author rented a training data center in a certain unit building to provide Internet training for nearby college students. About 80 computers are in the training data center, all these computers are connected to two common switches through the common m twisted pair wires. To facilitate the control of the Internet access status of each training terminal computer.

All computers use a proxy server to connect to the Internet. The Internet egress line is dedicated to 2 m broadband lines of local telecom companies. at ordinary times, each computer can access the Internet quickly, in addition, the speed of shared access between each computer is extremely fast.

Recently, in order to meet the intermediate computer examination, a friend is going to debug the connection between each computer in the training room to ensure that they can be accessed normally with the proxy server. However, when a friend opens a terminal computer and tries to access the data in the proxy server over the Internet, he finds that the computer browses the content of the proxy server site very slowly, crawling like a snail bait.

At the beginning, my friends thought that this terminal computer was running a lot of applications at the same time, resulting in excessive consumption of local computer system resources, resulting in slow response to the Internet, so I immediately restarted the computer system. After the computer was restarted successfully, I went online again for a test and found that the access speed was the same as that of a snail bait.

Remedies for faults

The switch ports that do not have access to the Internet can also flash constantly, which indicates that the LAN switch is working properly. In this way, when any computer attempts to access the proxy server through the switch, naturally, it is not normal. As the fault location is located, it is easy to solve the fault.

A friend estimates that all the signal lights of the faulty switch are constantly flashing. It may be that the switch with large traffic data is blocked, which can easily make the switch "too busy; as a result, he tried to shut down the power of the faulty switch device for a period of time, then re-connected it, and started the agent server system to prevent memory effect.

After doing this, my friend once again observed the proxy server's internal network card signal, and found that this time it was working normally. Then he rushed to the faulty Switch site, he found that all the signal lights of the switch have returned to normal. It seems that the switch has been blocked.

After "Dredging" the network channel between the proxy server and the switch, a friend selects a terminal computer and tries to access the data content of the proxy server system in the system, after finding that the Internet access speed has indeed recovered to normal, I randomly selected other computers in the LAN for Internet access tests. My friend found that all computers can access the Internet normally, the slow connection failure has been successfully solved, and the "sin" of this fault is naturally the switch that is blocked by the large-capacity data switch.

Troubleshooting Summary

From the troubleshooting process above, this network fault is caused by the blockage of the switch by the large-volume data switch. If we directly troubleshoot the switch's working status, then the troubleshooting speed will be very fast. However, in the actual check of network faults, a friend simply thinks that the switch equipment has stable performance and rarely encounters faults.

Therefore, during the troubleshooting process, the switch problem was neglected, so that the troubleshooting would naturally lead to many detours. To this end, we recommend that you do not focus on one of the nodes when checking for network faults in the future, but make comprehensive observation and judgment on the entire network connection system, in this way, network fault resolution efficiency can be improved.