1, the network card is damaged: if the network card of the network machine is damaged, a broadcast storm will occur. The damaged network card keeps sending a large number of data packets to the switch, causing a large number of useless data packets and triggering a broadcast storm. It is difficult to troubleshoot the broadcast storm caused by the physical damage of the network card. Because damaged network cards can generally access the Internet, we can use Sniffer LAN detection software to check the network data flow and determine the IP address of the fault point.

2. Network loop: Once in a network troubleshooting, a ridiculous error was found. Both ends of a twisted pair were plugged into different ports of the same switch, which led to a sharp decline in network performance and made it very difficult to open a webpage. The CPU utilization rate of each computer is 65,438+000%. This kind of fault is a typical network loop. Network loop is usually generated because both ends of the network line are connected to the switch at the same time.

3. Network virus: Some popular network viruses, such as Funlove, shockwave and RPC, will spread through the network immediately after the machine is poisoned. The spread of network virus will consume a lot of network bandwidth, cause network congestion and trigger a broadcast storm.

4. Use of hacking software: Some Internet users often use hacking software such as network law enforcement officers and network scissors to attack internal networks. Due to the use of these softwares, the network may also cause a broadcast storm.

5. Too many devices: The number of devices on the network is closely related to the broadcast storm. When there are too many devices on the network, the network efficiency drops rapidly and it is easy to form a broadcast storm. Therefore, broadcasting must be isolated by dividing VLANs. Generally speaking, every 50- 100 computers are divided into a VLAN.