Transmit Power Control in IEEE 802.11 Cisco WLAN networks

RRM neighbor messages that are exchanged by APs, over the air, are destined at multicast MAC address 01-0B-85-00-00-00 at the lowest rate, at the highest transmit power level, and over all supported channels every 60 seconds time interval, by default.

As an example, in radio “b” these messages are sent at level 1 transmit power and at 1 Mbps rate. In radio “a”, it is sent at the same transmit power level but at 6 Mbps rate instead.

It is to note that this functionality is hard-coded at firmware level of both radios and is untunable by engineer. It is not affected by power level and rates configured for regular radio interface users.

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