To be succint, all access points scan other channels to understand if they are on the best channel or not. This happens while access points are also serving channels. In Instant, Adaptive Radio Management or ARM is largely unchanged for years and how it functions is summarized here: https://higherlogicdownload.s3.amazonaws.com/HPE/MigratedAssets/ARM+Doc+Supplement.pdf
You have the option of enabling spectrum analysis, which would allow access points to be able to not only see interference, but be able to identify individual devices based on RF signatures, which can help you understand what non-wifi device you are trying to locate and possibly mitigate. Since most devices are 5ghz band capable, with much fewer non-wifi interferencing devices and many more channels to avoid interference, the need for dedicated spectrum analysis has diminished considerably. Even if spectrum analysis is turned on, the devices seen by that access point are only used for decisionmaking for the access point that has observed those devices.
I hope any of this makes sense.
Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.
HPE Design and Deploy Guides: https://community.arubanetworks.com/support/migrated-knowledge-base?attachments=&communitykey=dcc83c62-1a3a-4dd8-94dc-92968ea6fff1&pageindex=0&pagesize=12&search=&sort=most_recent&viewtype=card
Sent: Feb 01, 2023 03:29 AM
From: Erik Slagter
Subject: Dedicated "spectrum scanning" access point useful?
I now have four access points in a house, IAP-205's. I can turn them into "spectrum scanning" access points which means they don't handle access points, so I won't do that. But, suppose, I'd buy another one, place that one centrally and configure it to be "spectrum scanning", would that benefit my wireless performance? Or would it only give me graphs in the WebUI and numbers in the cli? Currently I am seeing frequent channel "hopping" of the access points due to "interference" or "empty channel". Would this process go smoother with a spectrum scanning access point in the swarm?