Hi Qazik,
Enter the diagnostic view and run the following commands:
sys
Enter system view, return user view with Ctrl+Z.
[huawei]diagnose
Enter diagnose view, return user view with Ctrl+Z.
Warning: The diagnosis view is used to debug system hardware and software. Misuse of certain commands in this view may affect system performance. Therefore, use these commands with the guidance of Huawei engineers.
[huawei-diagnose]set bridge mac-address 0001:0002:0003
[huawei-diagnose]quit
I hope it helps!