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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AP220 Series and High Density

  • 1.  AP220 Series and High Density

    Posted Jul 06, 2015 07:15 AM

    Hi

     

    I just wanted to share some experiences with high density ares and AP-220 series.

    I large customer had much of the same issues explained in this tread, not only towards Intel.

    They saw random disconnects, even failure to connect.

    We could actually see that the client was unabel to get a lock on the AP when roaming, PHY state was suddenly g, not a-HT or a-VHT.

    Often had to reboot computer or disable/enable the wireless device to get it running again.

    The Aruba system was running with most of the settings default, VHT and CM enabled and all.

    This happened only on AP-220, when moving to a buidling with the older AP-130 series, the issue was not seen.

    After weeks with TAC, i was given some new RF settings to use with AP-220 in particular.

    We ended up running AP groups for only AP-220 beacuse of this.

    The problem was related to too agressive Client Match etc, hence the roaming did not work, so users was disconnected.

     

    I use these settings whenever i install a system running AP-220's, this has proven to be very stable.

    As i understand much has changed with new drivers, but these settings a worth a shoot.

    This particular customer is running controller-based, but i guess this was aparent allready.

     

    As these problems happend over a year ago, the controllers in question was running 6.3.1.x, and they have been upgraded across 6.4 without problems.

     

    Settings we implemented are as follows:

     

    rf arm-profile "default.armg.11ac"
      cm-sticky-snr 15
      cm-sticky-min-signal 65
      cm-steer-timeout 3
      cm-lb-thresh 30
      cm-lb-client-thresh 30
      cm-max-steer-fails 2
    !
    rf ht-radio-profile "default.htrpg.11ac"
    !
    rf dot11g-radio-profile "default-g.11ac"
       arm-profile "default.armg.11ac"
       ht-radio-profile "default.htrpg.11ac"
    !
    rf arm-profile "default.arma.11ac"
      cm-sticky-snr 15
      cm-sticky-min-signal 65
      cm-steer-timeout 3
      cm-lb-thresh 30
      cm-lb-client-thresh 30
      cm-max-steer-fails 2
    !
    rf ht-radio-profile "default.htrpa.11ac"

     

    Hope this will help you

     

    Roar Fossen



  • 2.  RE: AP220 Series and High Density

    Posted Jul 07, 2015 07:09 AM

    There are some ClientMatch settings that were tweaked in later 6.3.1.x codes however, we STRONGLY recommend using our RF optimization solution on any deployment moving forward.  It is located here - 

     

    https://ase.arubanetworks.com/solutions/id/75

     

    In addition, we have published our 11ac reference design docs as well

     

    http://community.arubanetworks.com/t5/Validated-Reference-Design/RF-and-Roaming-Optimization-for-Aruba-802-11ac-Networks/ta-p/227716

     

    http://community.arubanetworks.com/t5/Validated-Reference-Design/Very-High-Density-802-11ac-Networks-Validated-Reference-Design/ta-p/230891



  • 3.  RE: AP220 Series and High Density

    Posted Jul 11, 2015 04:28 AM

    Of the Client Match settings listed, the only two that are not defaults (6.4.2.5 code) are:

    • cm-steer-timeout 3
    • cm-lb-thresh 30
    • cm-sticky-snr 15

    I have created new policies with the 2  of the above settings as well as some of the recommended RF and Roaming settings:

     

    rf arm-profile "A_Optimized"
    max-tx-power 18
    min-tx-power 12
    backoff-time 1800
    error-rate-threshold 70
    error-rate-wait-time 90
    cm-steer-timeout 3
    cm-lb-thresh 30

     

    rf arm-profile "G_Optimized"
    max-tx-power 12
    free-channel-index 40
    backoff-time 1800
    error-rate-threshold 70
    error-rate-wait-time 90
    cm-band-g-max-signal 10
    cm-steer-timeout 3
    cm-lb-thresh 30

     

    I have yet to test this as I just enabled it. I will find out Monday if I'm having better luck.



  • 4.  RE: AP220 Series and High Density

    Posted Jul 11, 2015 12:11 PM

    To be honest, the RF settings much more determine the success you will have vs. ClientMatch.  If the RF is not designed properly, ClientMatch will not be able to do its thing.

     

    Use the "show ap radio-summary" command to see your RF utilization numbers in the middle of the night, and then during the day.  Your utilization should not be more than 50% sustained for good performance.