Wireless Access

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Access network design for branch, remote, outdoor, and campus locations with HPE Aruba Networking access points and mobility controllers.
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Channel reuse issue, arm tuning

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  • 1.  Channel reuse issue, arm tuning

    Posted Oct 17, 2013 01:40 PM
    Hi,
    I have  performance issues in the NW (SW 6.1.3.4, no HT enabled) and have seen following:
    - 2.4G channel reuse, only channels 1 and 11 in use.
    - 5G frequent channel changes.
    - 5G retransmissions high
     
    I was trying to allocate more channels for 2.4G and get better channel plan. Also reduce the number of 5G channel changes and increase the coverage.
    So I made following changes to arm:
    - 5G tx pwr min from 12 to 15 dB  + Free channel index to 30
    - 2.4G RX sensitivity tuning based channel reuse for 2.4G to static mode (min TX 12dB in 2.4G)
     
    After this change, 2.4G channels were changed to 1, 5, 7, 11   instead of using 1,6,11 (reg domain has only 1,6,11 allowed). 
    Why this happened? What are the right parameters to tune for allocating best channels for both bands with minimum channel changes? Thank you for any feedback.
    ps. No interference in channel 6 area.


  • 2.  RE: Channel reuse issue, arm tuning

    EMPLOYEE
    Posted Oct 17, 2013 01:49 PM

    What is your regulatory domain?  What are your valid channels in that regulatory domain?

    In a dense environment, a 4 channel plan causes too much interference.

    You are not using HT anywhere?  You only have non-802.11n access points?  What model access points are you using?

     



  • 3.  RE: Channel reuse issue, arm tuning

    Posted Oct 17, 2013 02:05 PM

    Hi,

     

    US reg domain, valid channels 1,6,11.

    Yes, I dont want to use 4 channel plan.

    There are HT in some areas in use but not is this one. These are 802.11n APs, AP120.  Thanks.



  • 4.  RE: Channel reuse issue, arm tuning

    EMPLOYEE
    Posted Oct 17, 2013 02:09 PM
    @Air4me wrote:

    Hi,

     

    US reg domain, valid channels 1,6,11.

    Yes, I dont want to use 4 channel plan.

    There are HT in some areas in use but not is this one. These are 802.11n APs, AP120.  Thanks.

    Where did you turn off the HT and why is it using 4 channels?

     

    Besides that, what specific problem are you having?



  • 5.  RE: Channel reuse issue, arm tuning

    Posted Oct 17, 2013 02:19 PM

    Hi,

     

    So my problem is that system allocates 4 channels when I tried to get more channel 6 in use in the area. 

    What should the RX sensitivity tuning based channel reuse do when its in static mode (in 2.4G)?



  • 6.  RE: Channel reuse issue, arm tuning

    EMPLOYEE
    Posted Oct 17, 2013 02:45 PM
    @Air4me wrote:

    Hi,

     

    So my problem is that system allocates 4 channels when I tried to get more channel 6 in use in the area. 

    What should the RX sensitivity tuning based channel reuse do when its in static mode (in 2.4G)?

    What did you change when it started doing that?  It should only use the allowed channels in your regulatory domain...  That is unless you change the channels labeled + and -.......

     

    You probably need to get the channel situation straightened out before you do anything with RX sensitivity based channel reuse.  With that being said the chapter here:  http://www.arubanetworks.com/vrd/highdensityvrd/wwhelp/wwhimpl/common/html/wwhelp.htm#context=HighDensityVRD&file=chap6.html in the High Density VRD explains what it would be used for, and if it is necessary in your environment.  It also discusses alot of other ARM settings.  Quite frankly any environments get by with making few, if any changes to ARM, and the High Density VRD would tell you about any changes you could make in your environment, as well to compliment changes you are considering.

     



  • 7.  RE: Channel reuse issue, arm tuning

    Posted Oct 17, 2013 02:53 PM

    Hi,

    I actually change only the RX sensitivity tuning based channel reuse to static mode. After this the system allocates those 4 channels. Have you seen this kind of behaviour before?

    I will check this document, thanks.



  • 8.  RE: Channel reuse issue, arm tuning

    EMPLOYEE
    Posted Oct 17, 2013 02:54 PM
    I have never seen that, and it should not do that...


  • 9.  RE: Channel reuse issue, arm tuning

    Posted Oct 17, 2013 05:32 PM

    Like cjoseph mentioned , you validate this :

     

    (controller) #show  ap regulatory-domain-profile <profilename>

     

    Regulatory Domain profile "profilename"
    -----------------------------------
    Parameter Value
    --------- -----
    Country Code US
    Valid 802.11g channel 1
    Valid 802.11g channel 6
    Valid 802.11g channel 11
    Valid 802.11a channel 36
    Valid 802.11a channel 40
    Valid 802.11a channel 44
    Valid 802.11a channel 48
    Valid 802.11a channel 149
    Valid 802.11a channel 153
    Valid 802.11a channel 157
    Valid 802.11a channel 161
    Valid 802.11a channel 165
    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 149-153
    Valid 802.11a 40MHz channel pair 157-161
    Valid 802.11a 80MHz channel group N/A

     

    Also check if theres any other type of non-aruba devices that maybe using CH 6 

    (controller) #show  ap  monitor ap-list ap-name <ap-name>