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#show ap arm history..explanation required?

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  • 1.  #show ap arm history..explanation required?

    MVP EXPERT
    Posted Nov 25, 2015 10:27 AM

    Would someone be able to kindly explain to me what and why I am seeing the below? The way I am understanding is that there is interfernece on CH100, so the AP has moved to CH140. However I have a few questions.

     

    - Why is this doing it every few seconds, is it due to the continous channel scans in the background?

    - Why is it recording this information since there is no change in channel or power?

     

    Interface :wifi0
    ARM History
    -----------
    Time of Change       Old Channel  New Channel  Old Power  New Power  Reason
    --------------       -----------  -----------  ---------  ---------  ------
    2015-11-25 14:37:57  36           36           15         18         P+
    2015-11-25 13:04:27  100+         140          18         18         I
    2015-11-25 13:04:26  100+         140          18         18         I
    2015-11-25 13:04:25  100+         140          18         18         I
    2015-11-25 13:04:24  100+         140          18         18         I
    2015-11-25 13:04:23  100+         140          18         18         I
    2015-11-25 13:04:22  100+         140          18         18         I
    2015-11-25 13:04:21  100+         140          18         18         I
    2015-11-25 13:04:20  100+         140          18         18         I
    2015-11-25 13:04:19  100+         140          18         18         I
    2015-11-25 13:04:18  100+         140          18         18         I
    2015-11-25 13:04:17  100+         140          18         18         I
    2015-11-25 13:04:16  100+         140          18         18         I
    2015-11-25 13:04:15  100+         140          18         18         I
    2015-11-25 13:04:14  100+         140          18         18         I
    2015-11-25 13:04:13  100+         140          18         18         I
    2015-11-25 13:04:12  100+         140          18         18         I
    2015-11-25 13:04:10  100+         140          18         18         I
    2015-11-25 13:04:09  100+         140          18         18         I
    2015-11-25 13:04:08  100+         140          18         18         I
    2015-11-25 13:04:07  100+         140          18         18         I
    2015-11-25 13:04:06  100+         140          18         18         I
    2015-11-25 13:04:05  100+         140          18         18         I
    2015-11-25 13:04:04  100+         140          18         18         I
    2015-11-25 13:04:03  100+         140          18         18         I
    2015-11-25 13:04:02  100+         140          18         18         I
    2015-11-25 13:04:01  100+         140          18         18         I
    2015-11-25 13:04:00  100+         140          18         18         I
    2015-11-25 13:03:59  100+         140          18         18         I
    2015-11-25 13:03:58  100+         140          18         18         I
    2015-11-25 13:03:57  100+         140          18         18         I
    2015-11-25 13:03:56  100+         140          18         18         I

     

    Many thanks,
    Craig



  • 2.  RE: #show ap arm history..explanation required?

    EMPLOYEE
    Posted Nov 25, 2015 10:31 AM

    What version of ArubaOS is this?

    Do you have scanning enabled in the ARM profile?

    What channels are in your regulatory domain profile?



  • 3.  RE: #show ap arm history..explanation required?

    MVP EXPERT
    Posted Nov 25, 2015 10:44 AM

    Hi, the controller is running Version 6.4.3.2, scanning is enabled in the ARM profile and we have the below in our reg domain profile :

     

    Regulatory Domain profile "default-UK-noDFS"
    --------------------------------------------
    Parameter                          Value
    ---------                          -----
    Country Code                       GB
    Valid 802.11g channel              1
    Valid 802.11g channel              6
    Valid 802.11g channel              13
    Valid 802.11a channel              36
    Valid 802.11a channel              40
    Valid 802.11a channel              44
    Valid 802.11a channel              48
    Valid 802.11g 40MHz channel pair   1-5
    Valid 802.11g 40MHz channel pair   7-11
    Valid 802.11a 40MHz channel pair   36-40
    Valid 802.11a 40MHz channel pair   44-48
    Valid 802.11a 80MHz channel group  36-48
    Valid 802.11a 80MHz channel group  52-64
    Valid 802.11a 80MHz channel group  100-112
    Valid 802.11a 80MHz channel group  116-128



  • 4.  RE: #show ap arm history..explanation required?

    EMPLOYEE
    Posted Nov 25, 2015 10:46 AM
    That is not right. Your regulatory domain does not have channel 100 in a channel pair.


  • 5.  RE: #show ap arm history..explanation required?

    MVP EXPERT
    Posted Nov 25, 2015 10:59 AM

    Hi Colin, apoligies, the regulatory domain profile shown above was the one I changed to after the issue occured. The default profile which was used when the issue occured has channel 100 configured.

     

    Regardless of the above, do we know why the AP is is scanning every second and recording that output? Since I changed the reg domain profile to use the non-DFS channels I can see this has settled down and now remains on AP36 (see below).


    What is the cause of this behaviour?

     

    Interface :wifi0
    ARM History
    -----------
    Time of Change       Old Channel  New Channel  Old Power  New Power  Reason
    --------------       -----------  -----------  ---------  ---------  ------
    2015-11-25 14:37:57  36           36           15         18         P+
    2015-11-25 13:04:27  100+         140          18         18         I
    2015-11-25 13:04:26  100+         140          18         18         I
    2015-11-25 13:04:25  100+         140          18         18         I
    2015-11-25 13:04:24  100+         140          18         18         I
    2015-11-25 13:04:23  100+         140          18         18         I
    2015-11-25 13:04:22  100+         140          18         18         I
    2015-11-25 13:04:21  100+         140          18         18         I
    2015-11-25 13:04:20  100+         140          18         18         I
    2015-11-25 13:04:19  100+         140          18         18         I
    2015-11-25 13:04:18  100+         140          18         18         I
    2015-11-25 13:04:17  100+         140          18         18         I
    2015-11-25 13:04:16  100+         140          18         18         I
    2015-11-25 13:04:15  100+         140          18         18         I
    2015-11-25 13:04:14  100+         140          18         18         I
    2015-11-25 13:04:13  100+         140          18         18         I
    2015-11-25 13:04:12  100+         140          18         18         I
    2015-11-25 13:04:10  100+         140          18         18         I
    2015-11-25 13:04:09  100+         140          18         18         I
    2015-11-25 13:04:08  100+         140          18         18         I
    2015-11-25 13:04:07  100+         140          18         18         I
    2015-11-25 13:04:06  100+         140          18         18         I
    2015-11-25 13:04:05  100+         140          18         18         I
    2015-11-25 13:04:04  100+         140          18         18         I
    2015-11-25 13:04:03  100+         140          18         18         I
    2015-11-25 13:04:02  100+         140          18         18         I
    2015-11-25 13:04:01  100+         140          18         18         I
    2015-11-25 13:04:00  100+         140          18         18         I
    2015-11-25 13:03:59  100+         140          18         18         I
    2015-11-25 13:03:58  100+         140          18         18         I
    2015-11-25 13:03:57  100+         140          18         18         I
    2015-11-25 13:03:56  100+         140          18         18         I



  • 6.  RE: #show ap arm history..explanation required?

    EMPLOYEE
    Posted Nov 25, 2015 11:01 AM
    An access point will change channels because of interference immediately. If you only have one channel configured and you have interference, that is the result..


  • 7.  RE: #show ap arm history..explanation required?

    MVP EXPERT
    Posted Nov 25, 2015 11:09 AM

    Hey Colin, thanks for the prompt reply. I understand this but based on the above output in the previous post :

    ARM has detected interference on CH100 at 2015-11-25 13:03:56 then continues to scan every second until 2015-11-25 13:04:27. During this entire period the AP is on CH104. So why the every second behaviour?



  • 8.  RE: #show ap arm history..explanation required?

    EMPLOYEE
    Posted Nov 25, 2015 11:15 AM
    You still have not shown the correct regulatory domain profile. It can detect interference at any time. It looks like yours is persistent..


  • 9.  RE: #show ap arm history..explanation required?

    MVP EXPERT
    Posted Nov 25, 2015 11:23 AM

    Here's the reg domain profile at the time the issue was occuring :

     

    (SLHL1) #show ap regulatory-domain-profile default

    Regulatory Domain profile "default"
    -----------------------------------
    Parameter                          Value
    ---------                          -----
    Country Code                       GB
    Valid 802.11g channel              1
    Valid 802.11g channel              6
    Valid 802.11g channel              13
    Valid 802.11a channel              36
    Valid 802.11a channel              40
    Valid 802.11a channel              44
    Valid 802.11a channel              48
    Valid 802.11a channel              52
    Valid 802.11a channel              56
    Valid 802.11a channel              60
    Valid 802.11a channel              64
    Valid 802.11a channel              100
    Valid 802.11a channel              104
    Valid 802.11a channel              108
    Valid 802.11a channel              112
    Valid 802.11a channel              132
    Valid 802.11a channel              136
    Valid 802.11g 40MHz channel pair   1-5
    Valid 802.11g 40MHz channel pair   7-11
    Valid 802.11a 40MHz channel pair   36-40
    Valid 802.11a 40MHz channel pair   44-48
    Valid 802.11a 40MHz channel pair   52-56
    Valid 802.11a 40MHz channel pair   60-64
    Valid 802.11a 40MHz channel pair   100-104
    Valid 802.11a 40MHz channel pair   108-112
    Valid 802.11a 40MHz channel pair   132-136
    Valid 802.11a 80MHz channel group  N/A



  • 10.  RE: #show ap arm history..explanation required?

    EMPLOYEE
    Posted Nov 25, 2015 11:31 AM
    You should open a tac case. They would have to look at your logs and exact configuration as well as the changes you made. I cannot guess based on the information here.