you can refer to the following command sequence:
<R10U18-NE40E>system-view
Enter system view, return user view with Ctrl+Z.
[R10U18-NE40E]diag
[R10U18-NE40E]diagnose
Enter diagnosis view, return user view with Ctrl+Z.
[R10U18-NE40E-diagnose]mac-address ?
lpu Set PIC card mac-address in LPU board
mpu Set mac-address in MPU board
[R10U18-NE40E-diagnose]mac-address mpu ?
H-H-H Format: not be 0000-0000-0000 or ffff-ffff-ffff or multicast address