for example on a system CloudEngine S6730-H48Y6C-V2:

<switch>display license esn
ESN: <some serialnumber>

<switch>license trial enable

.. and some more commands see also
- CloudEngine S6730-H48Y6C-V2
https://support.huawei.com/hedex/hdx.do?docid=EDOC1100318315&id=EN-US_CONCEPT_0000001364780229
-https://support.huawei.com/hedex/hdx.do?docid=EDOC1100318315&id=EN-US_CONCEPT_0000001272149817
- Run the display license esn command to obtain the ESNs of member switches in the stack.

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