Just to add. From what I have seen, a brand new AP powered up will typically use channel 11 or 1 with the highest power available. RRM works only when there are at least 3 nearby AP's on the same RF Group. Here are some links also that will explain it.
Q. I have set the Radio Resource Management (RRM) to the default settings on my WLC. However, I cannot find my RRM to automatically adjust the channel and power levels. Why?
A. RRM possibly does not work for any of these reasons
The RRM works only if an AP hears RF signals from at least 3 nearby APs, with a third neighbor that transmits a signal strength greater than -65dbm. If any of these condition fails, the RRM does not work.
The auto RRM feature includes channel adjustment, power adjustment, and coverage hole detection. These features do not work if they are either disabled or the method of assignment is chosen as manual.
While a fresh AP boots up, it initially keeps power at the default value of 1 (highest). When it sees 3 or more APs with power levels greater than -65 dBm (in the same RF-Mobility-Domain and same channel), it attempts RRM first (change channels). If not successful because the channels are manually fixed or there are more APs than channels available, the AP drops its power level.
Refer to Radio Resource Management: Concepts for more information on how RRM works.
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a008072c759.shtml#concepts
Sent from Cisco Technical Support iPhone App
-Scott
*** Please rate helpful posts ***
