Wireless Access

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Access network design for branch, remote, outdoor and campus locations with Aruba access points, and mobility controllers.
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RAP 93 - WiFi interference - possible solutions

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  • 1.  RAP 93 - WiFi interference - possible solutions

    Posted Aug 07, 2013 08:37 AM

    We have 2 branches that have each an RAP-93 and they are complaining about WiFi signal and dropping connections.

    Here is the output for one of them (the other is almost the same):

    Channel Summary
    ---------------
    channel retry phy-err mac-err noise cov-idx(Total) intf_idx(Total)
    ------- ----- ------- ------- ----- -------------- ---------------
    1 0 0 0 93 0/0(0) 35/55//0/0(90)
    6 0 0 0 93 0/0(0) 179/55//0/0(234)
    11 0 0 1 95 12/0(12) 59/46//0/0(105)
    36 0 0 0 93 0/0(0) 0/0//0/0(0)
    40 0 0 0 93 0/0(0) 0/0//0/0(0)
    44 0 0 0 93 0/0(0) 0/0//0/0(0)
    48 0 0 0 92 0/0(0) 0/0//0/0(0)
    149 0 0 0 92 0/0(0) 0/0//0/0(0)
    153 0 0 0 93 0/0(0) 0/0//0/0(0)
    157 0 0 0 93 0/0(0) 0/0//0/0(0)
    161 0 0 0 93 0/0(0) 0/0//0/0(0)
    165 0 0 0 93 0/0(0) 0/0//0/0(0)


    HT Channel Summary
    ------------------
    channel_pair Pairwise_intf_index
    ------------ -------------------

    Interface Name :wifi0
    Current ARM Assignment :11/127
    Covered channels a/g :0/1
    Free channels a/g :9/2
    ARM Edge State :disable
    Last check channel/pwr :1m:13s/6m:48s
    Last change channel/pwr :4h:26m:18s/1d:22h:44m:56s
    Next Check channel/pwr :3m:35s/54s
    Assignment Mode :Multi Band

     

    signal issue.PNG

     

    Our SSID's are "OFFICE1" and "OFFICE1_A".

     

     

    The solution that we thought are as follow :

    1) Changing the Min TX EIRP to 18 (but doing this will make the cell of coverage smaller and we wouldn't have service in all the branch)

    2) Adding a second RAP 93

    4) Changing the to a RAP-105 and steer clients more to the 5GHz instead of the 2.4.

     

    The RSSI is -61 at the far ends of the coverage. (values were obtained while using a smart phone). 



  • 2.  RE: RAP 93 - WiFi interference - possible solutions

    Posted Aug 07, 2013 10:26 AM

     

    Since you have a lot of interfering devices in your area you may want to add an additional AP decrease the min power to 12 or you could possibly drop it to 9 (make sure you test this) since it looks like even at the far end you can still get a very good signal , drop multicast/broadcast on the VAP as well if none of the application used by the users require multicast.

     

    But of course the best thing you could do is to add a capable 802.11a RAPs so you can steer your devices to 5Ghz .



  • 3.  RE: RAP 93 - WiFi interference - possible solutions

    Posted Aug 07, 2013 02:18 PM

    I could see just two interfering AP`s on channel 11 and most of the interfereing AP`s are at channel 6.

    The best way to eliminate the problem is to reduce the power of the AP or just move the client to "a" radio that should fix it.

     

    When the issue occurs, you can also look for show ap debug client-table ap-name <name of the ap> to check and confirm what is the tx/rate client been transmitting and the re-tries value of it.

     

    Thanks!



  • 4.  RE: RAP 93 - WiFi interference - possible solutions
    Best Answer

    Posted Nov 15, 2013 08:16 AM

    We went with an AP 105 at the location and that addressed the issue.