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Access point Poor Quality

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  • 1.  Access point Poor Quality

    Posted May 21, 2015 12:14 AM

    Hello,

     

    Our user  are complaining for poor performance  of APs and sometimes drop out. Then I checked the dashboard and I saw this Poor quality. I don't know what it means.

     

    Please help me to investigate and fix this issue.

     

    the output below is "show  ap arm state ap-name" for the AP that I found poor quality

     

    (THGWLC001) #show  ap arm state ap-name THGWLA003

    AP:THGWLA003 MAC:6c:f3:7f:31:c4:c0 Channel:5 EIRP:15 Max EIRP:19 Edge:enable
    Client Density:67 Valid neighbors: 6 Relevant neighbors: 5 Rx Probe Reports: 2747
    Moves(T/S):9/1 Sticky(T/S):2/0 Bandsteer(T/S):7/1 Loadbal(T/S):0/0
    Neighbor Data
    -------------
    Name               IP Address   SNR (dB)  Path Loss (dB)  Channel/Pwr  Neighbor Density  Neighbors (R/T)  Relevant
    ----               ----------   --------  --------------  -----------  ----------------  ---------------  --------
    6c:f3:7f:31:c8:40  -            -         -               -            -                 -                -
    6c:f3:7f:31:c4:00  -            -         -               -            -                 -                -
    6c:f3:7f:31:c4:50  -            -         -               -            -                 -                -
    THGWLA004          172.17.1.14  49        81              1/19         62/67/92/92        6/6             Yes
    6c:f3:7f:31:c4:60  -            -         -               -            -                 -                -
    THGWLA005          172.17.1.15  24        0               11/9         60/64/89/93        5/5             Yes
    Legend: R = Relevant, T = Total,  Neighbor Density = (Overlap/Neighbor's Density/ Overlap to local density ratio/ Overlap to neighbor's density ratio)

    AP:THGWLA003 MAC:6c:f3:7f:31:c4:c8 Channel:100 EIRP:24 Max EIRP:24 Edge:disable
    Client Density:0 Valid neighbors: 7 Relevant neighbors: 3 Rx Probe Reports: 2088
    Moves(T/S):0/0 Sticky(T/S):0/0 Bandsteer(T/S):0/0 Loadbal(T/S):0/0
    Neighbor Data
    -------------
    Name               IP Address   SNR (dB)  Path Loss (dB)  Channel/Pwr  Neighbor Density  Neighbors (R/T)  Relevant
    ----               ----------   --------  --------------  -----------  ----------------  ---------------  --------
    6c:f3:7f:31:c4:08  -            -         -               -            -                 -                -
    THGWLA010          172.17.1.20  11        109             60/22        0                  3/7              
    THGWLA005          172.17.1.15  22        86              60/15        0                  3/7             Yes
    THGWLA004          172.17.1.14  34        0               108/24       0                  4/9             Yes
    6c:f3:7f:31:b6:a8  -            -         -               -            -                 -                -
    THGWLA007          172.17.1.17  6         112             132/24       0                  1/9              
    6c:f3:7f:31:c3:c8  -            -         -               -            -                 -                -
    Legend: R = Relevant, T = Total,  Neighbor Density = (Overlap/Neighbor's Density/ Overlap to local density ratio/ Overlap to neighbor's density ratio)

     

     

    any suggestions are welcome



  • 2.  RE: Access point Poor Quality

    Posted May 21, 2015 04:35 AM

    That command does not tell the full story.  Can you post a screenshot of the "Performance Summary" on the Dashboard?



  • 3.  RE: Access point Poor Quality

    Posted May 21, 2015 04:47 AM
      |   view attached

    The screenshot  show as the below , it shows poor quality randomly.

     

    Thanks so much



  • 4.  RE: Access point Poor Quality

    Posted May 21, 2015 04:49 AM
      |   view attached

    and here is the performance summary



  • 5.  RE: Access point Poor Quality

    Posted May 21, 2015 04:51 AM

    warinda@th.fujitsu.com wrote:

    and here is the performance summary


    According the performance summary, most of your network does not seem to be bad.  There might be improvements that can be made, however.

     



  • 6.  RE: Access point Poor Quality

    Posted May 21, 2015 04:49 AM

    What regulatory domain is this?  It seems that you have channels 5 and 7 enabled, when it should typically only be 1, 6 and 11..



  • 7.  RE: Access point Poor Quality

    Posted May 21, 2015 04:58 AM

    I'm sorry that I don't understand about " regulatory domain " that you mentioned.

    I'm newbie for Aruba, please explain me more.

     

    Thanks so much



  • 8.  RE: Access point Poor Quality

    Posted May 21, 2015 05:03 AM

    The regulatory domain is effectively the country that you are in, there will be a regulatory body in your area that determines what channels you can transmit on. In the US it is the FCC, in europe this is ETSI.



  • 9.  RE: Access point Poor Quality

    Posted May 21, 2015 05:03 AM

    The regulatory domain is not specific to Aruba.  It exist in all wireless LANs.  The regulatory domain would be the country where the WLAN is deployed.

     

    Your controller is using channels 5 and 7 which is causing interference.  It should only be channels 1, 6 and 11.  Please ask  the person who configured the controller so that they make this change.



  • 10.  RE: Access point Poor Quality

    Posted May 21, 2015 05:14 AM

    Thank you so much for your suggestions and explanation.

    if you don't mind please explain me more

    Why using channels 5 and 7  will cause interference? and how do you notice my controller should be

    use channel 1, 6 and 11?

     

    Thank you in avdance



  • 11.  RE: Access point Poor Quality
    Best Answer

    Posted May 21, 2015 05:18 AM

    Channels  5 and 7 overlap each other, so they should not be used, because it causes interference and bad performance.   Unfortunately the controller allows the administrator to configure any channels, but to avoid interference, it should be channels 1, 6 and 11.

     

    The channel column in your screenshot here:  http://community.arubanetworks.com/aruba/attachments/aruba/Aruba-Apps/349/1/aruba_dashboard.jpg says what channels your access points are on.



  • 12.  RE: Access point Poor Quality

    Posted May 21, 2015 05:24 AM

    Thanks so much I will apply as your suggestions, and keep monitoring.