Why is the AC serial number displayed on Cloudnet not the real serial number of the device?

Why is the AC serial number displayed on Cloudnet not the real serial number of the device?

 If the device implements IRF, the AC serial numbers displayed on the active and standby ACs are the same virtual serial number, and the suffix of the serial number is randomly generated. In this way, both the master and the backup use a serial number to treat them as a whole, so that data will not be lost when switching. If you want to check the real serial number of AC. You can click to view the basic information of the AC.