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Radar Interference Causing Channel Changes on AP577

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  • 1.  Radar Interference Causing Channel Changes on AP577

    Posted Nov 19, 2023 08:54 PM

    We have been noticing strange behavior from one of our AP577 in which it's changing channels quite frequently. Here are some recent outputs:

    #show ap arm history ap-name sjc51-apo-eng2-2

    Interface :wifi0
    Phy-Type  :5GHz
    ARM History
    -----------
    Time of Change       Old Channel  New Channel  Old Power  New Power  Reason  Result
    --------------       -----------  -----------  ---------  ---------  ------  ------
    2023-10-12 22:50:00  128+         108+         18         18         R       -
    2023-10-12 09:30:36  52+          128-         18         18         C       -
    2023-10-11 20:58:15  128+         52+          18         18         R       -
    2023-10-11 11:52:42  64-          128-         18         18         C       -
    2023-10-10 23:28:45  128-         64-          18         18         R       -
    2023-10-10 23:26:28  108+         128-         18         18         C       -
    2023-10-10 20:54:58  120+         108+         18         18         R       -
    2023-10-10 11:08:53  128-         120-         18         18         R       -
    2023-10-10 11:08:20  149+         128-         18         18         C       -
    2023-10-09 22:41:49  128+         149+         18         18         R       -
    2023-10-09 08:47:55  120-         128-         18         18         C       -
    2023-10-08 20:23:06  128-         120-         18         18         R       -
    2023-10-08 20:20:37  149+         128-         18         18         C       -
    2023-10-08 07:55:24  128+         149+         18         18         R       -
    2023-10-08 07:52:14  120-         128-         18         18         C       -
    2023-10-07 19:28:54  128-         120-         18         18         R       -
    2023-10-07 19:28:47  64-          128-         18         18         C       -
    2023-10-07 07:07:52  128-         64-          18         18         R       -
    2023-10-07 06:51:12  161-         128-         18         18         C       -
    2023-10-07 06:19:15  128-         161-         18         18         R       -
    2023-10-01 22:41:06  108+         64-          18         18         C       -
    2023-10-01 11:19:03  128+         108+         18         18         R       -
    2023-10-01 10:22:58  64-          128-         18         18         R       -
    2023-09-30 07:18:59  149+         64-          18         18         C       -
    2023-09-29 18:54:56  64+          149+         18         18         R       -
    2023-09-29 17:58:37  116+         64-          18         18         C       -
    2023-09-29 17:27:02  64+          116+         18         18         R       -
    2023-09-12 04:25:37  116-         128-         18         18         R       -
    2023-09-07 08:18:58  0            116+         0          18         Random  -

    I: Interference, R: Radar detection, N: Noise exceeded, Q: Bad Channel Quality E: Error threshold exceeded, INV: Invalid Channel, G: Rogue AP Containment, M: Empty Channel, P+: Increase Power, P-: Decrease Power, 40INT: 40MHZ intol detected on 2.4G, NO40INT: 40MHz intol cleared on 2.4G, OFF(R): Turn off Radio due to Radar, OFF(MA): Turn off Radio due to Mode Aware, ON: Turn on Radio, D: Dynamic Bandwidth Switch, AIRMATCH: AirMatch Event, I*: CCA Interference, C: Radar cleared, NC: Noise Cleared, Random: Random Channel, RMC: Radio Mode Change, RCP: Radio Client Preference Change, OFF(C) : Turn off Radio due to config, U: UTB

    Client Aware is enabled by default. CSA (Channel Switch Announcement) is also enabled. The strange thing is, users were reporting disconnects during the time of channel changes. However, client aware is enabled and should prevent such channel changes but that is not the case. 

    Does anyone have any ideas on what the cause is besides possibly being a faulty AP? 



  • 2.  RE: Radar Interference Causing Channel Changes on AP577

    EMPLOYEE
    Posted Nov 20, 2023 02:46 AM

    If a Radar event is detected the AP will immediately vacate the channel, does not matter what is configured.

    If you are consistently getting Radar events then the only real option is to exclude the DFS channels from the regulatory domain configuration.  If you believe that these Radar events are spurious then open a case with TAC to investigate options.



    ------------------------------
    Carson Hulcher, ACEX#110
    ------------------------------