Ethernet is a computer local area network technology. The IEEE 802.3 standard of IEEE organization sets the technical standard of Ethernet, which includes physical layer wiring, electronic signal and medium access layer protocol. In Ethernet test, in order to monitor the data of a port, port mirroring test method is usually adopted.
The port mirroring function can monitor the network by forwarding data traffic from one or more source ports to designated ports on a switch or router. The designated port is called "mirror port" or "destination port", and the network traffic can be monitored and analyzed through the mirror port without seriously affecting the normal throughput of the source port. Using the mirror function in an enterprise can monitor and manage the internal network data well, and can quickly locate the fault when the network fails.
The function of port mirroring
The function of mirroring is only to mirror the monitored traffic to the monitoring port for fault location, traffic analysis, traffic backup and so on. The monitoring port is usually directly connected to the monitoring host.
Monitor all data packets entering and leaving the network for the management server installed with monitoring software to grab data. For example, Internet cafes need to provide this function to send data to the public security department for review. For the sake of information security and protecting company secrets, enterprises urgently need a port in the network to provide this real-time monitoring function. Port mirroring function can be used for enterprises to monitor and manage internal network data, and it can locate the fault well when the network fails.