Vswitch causes network breakdown

Fault description: My friends who opened the internet cafe reported that the new ten computers were very strange recently. When there were few Internet users, the computer was normal. When there were seven or eight people surfing the internet at the same time, ten computers automatically go on strike, not only online games cannot be played, but even webpages cannot be opened. However, after you unplug the network cable from the switch and plug it in separately, the new computer will work normally. After hearing such a strange thing, I decided to find out.

Troubleshooting: it is not long for this Internet cafe friend to take over. Because the computers used to be outdated, the ten computers were newly purchased and connected separately through a switch, some old computers are connected by another switch, and the two switches are connected to the master switch respectively. The old and new computers are divided into two different network segments. The author analyzed the possibility of the impact of the network virus, because after the network cable is plugged in and plugged in, the problem occurs in the section of the new computer. It should be caused by a broadcast storm, but where is the "Storm" caused? First, I checked the network cable and found that the network cable was good, eliminating the possibility of a broadcast storm caused by network cable damage. Considering that some hacker software would attack the internal network of the Internet cafe, I thoroughly checked the system, no hacker software exclusive bandwidth or malicious attack on the internal network was detected using the anti-Black software scan. Then, through the Sniffer LAN management software, packets were captured to view network data traffic and no fault was identified.

For a long time, the problem becomes more and more concentrated on the switches connected to the ten computers. It is reasonable to say that the switches should not generate a broadcast storm, because the switch and node work in a point-to-point forwarding mode, however, I found a clue on this "Switch. Friends who do not know much about network equipment are greedy for cheap prices. The fake "Switch" is not a real switch, but a so-called smart Hub enthusiastically recommended by JS. So I immediately used another vswitch to replace this fake smart Hub. After ten new computers access the Internet, they can work normally, and there will be no collective strikes for a long time.

Fault analysis: the so-called smart Hub itself has a rough schedule, and when there are few computers on the Internet, it produces fewer error signals, so it does not affect network bandwidth. When the network is busy, multiple users may "compete" for one channel at a time, resulting in network congestion.

Edit comment: When purchasing a product, you must first know more about the product and what kind of product you need. Do not be confused by the rhetoric of JavaScript to buy so-called "intelligent, high-tech" fake and shoddy products, thus causing unnecessary faults. Countless troubleshooting experiences tell us that replacement is the simplest and easier to master.