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And what do next block

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conf t

int d0

mac-address 1122.3344.5566

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What reason ??

That changes the mac address on that interface, for almost all practical purposes. If you set a custom mac address on an interface, the new mac will be used in preference to the BIA for everything except a few commands where you have the option to specify use of the BIA.

I can think of very few honest reasons for spoofing a mac address, though. What are you trying to accomplish?

Just few MAC addresses our wireless network registered in control organisation. After this summer we lost this devices (into strong thunder). And register again will be a long time ))

Just bureaucracy situation

And just technical interes )

Hello, we have the same problem. How to change MAC-address on int do0 while Do0 in root access-point mode? Command mac-address xxxx.xxxx.xxxx doesn't do any changes even with shut/no shut. After no shut "show int do0" show that bia mac-address is active.