The display license esn command displays the equipment serial number (ESN) used for applying a license.
This command takes effect only on the device that loads the license control item.
When you need to use licensed resource items or function items, apply to Huawei for a license file. When applying for a license, you need to provide the device ESN.
ESN is the only identifier of device components, run the display license esn command to display the ESN of the current device, and then use the ESN to apply a license file for the device.
The ESN of the chassis must be the same as the ESN in the license to be activated. If they are different, the license file cannot be activated.