Aruba Airwave

 View Only
last person joined: 7 days ago 

Back to discussions
Expand all | Collapse all

WiFi Metrics

This thread has been viewed 24 times

  • 1.  WiFi Metrics

    Posted May 22, 2023 01:53 PM

    Hello Every Body :

    Actually I am on a Network Issue, and i need to enhace my assumption with metrics that the issue is not coming from WiFi.

    I did first tShoot: no interference, no SNR issue and good coverage (-50 -60 dBm) in the area.

     Idid the show ap arm rf-summary cmd and i had waht bellow.

    My problem is how interpret the "COV-idx" and "intf_idx" , i did not find the scales (Values) to do so "What values are considired good and what are not" ?? Any Help

    Thx

    channel  retry  phy-err  mac-err  noise  util(Qual)     cov-idx(Total)  intf_idx(Total)
    -------  -----  -------  -------  -----  ----------     --------------  ---------------
    36       0      0        0        96     1/0/1/0/100    6/0(6)          0/0//0/0(0)
    40       0      0        0        92     0/0/0/0/100    0/0(0)          0/0//0/0(0)
    44       0      0        0        92     0/0/0/0/100    0/0(0)          0/12//0/0(12)
    48       0      0        0        92     4/3/0/0/99     7/0(7)          38/4//0/0(42)
    52       0      0        10       92     22/22/0/0/100  0/0(0)          11/13//0/0(24)
    56       0      0        0        92     0/0/0/0/100    0/0(0)          0/4//0/0(4)
    60       0      0        0        92     0/0/0/0/100    0/0(0)          0/0//0/0(0)
    64       0      0        0        92     0/0/0/0/100    0/0(0)          0/0//0/0(0)
    100      0      0        0        92     1/1/0/0/100    5/0(5)          25/0//0/0(25)
    104      0      0        0        92     0/0/0/0/100    0/0(0)          0/11//0/0(11)
    108      0      0        0        92     0/0/0/0/100    0/0(0)          8/0//0/0(8)
    112      0      0        0        92     0/0/0/0/100    0/0(0)          0/16//0/0(16)
    116      0      0        80       92     21/21/0/0/100  6/0(6)          39/0//0/0(39)
    120      0      0        0        92     0/0/0/0/100    0/0(0)          0/18//0/0(18)
    124      0      0        0        92     2/2/0/0/100    3/0(3)          17/0//0/0(17)
    128      0      0        0        92     0/0/0/0/100    0/0(0)          0/5//0/0(5)
    132      0      0        0        92     0/0/0/0/100    0/0(0)          0/0//0/0(0)
    136      0      0        0        92     0/0/0/0/100    0/0(0)          0/0//0/0(0)
    140      0      0        0        92     0/0/0/0/100    0/0(0)          0/0//0/0(0)
    1        0      0        0        94     42/40/0/0/98   18/0(18)        102/17//0/0(119)
    6        0      0        0        94     30/29/0/0/99   16/0(16)        94/26//0/0(120)
    11       0      0        0        96     11/3/8/0/100   7/0(7)          42/17//0/0(59)



  • 2.  RE: WiFi Metrics

    EMPLOYEE
    Posted Jul 03, 2023 08:28 AM

    In general these numbers are user internal for ARM/Airmatch, but I found some info here:

    ARM Metrics

    ARM computes coverage and interference metrics for each valid channel and chooses the best performing channel and transmit power settings for each AP's RF environment. Each AP gathers other metrics on their ARM-assigned channel to provide a snapshot of the current RF health state.

    The following two metrics help the AP decide which channel and transmit power setting is best.

    • Coverage Index: The AP uses this metric to measure RF coverage. The coverage index is calculated as x/y, where "x" is the AP's weighted calculation of the Signal-to-Noise Ratio (SNR) on all valid APs on a specified 802.11 channel, and "y" is the weighted calculation of the ArubaAPs SNR the neighboring APs see on that channel.

    To view these values for an AP in your current WLAN environment issue the CLI command show ap arm rf-summary ap-name <ap-name>, where <ap-name> is the name of an AP for which you want to view information.

    • Interference Index: The AP uses this metric to measure co-channel and adjacent channel interference. The Interference Index is calculated as a/b//c/d, where:

    • Metric value "a" is the channel interference the AP sees on its selected channel.

    • Metric value "b" is the interference the AP sees on the adjacent channel.

    • Metric value "c" is the channel interference the AP's neighbors see on the selected channel.

    • Metric value "d" is the interference the AP's neighbors see on the adjacent channel

    To manually calculate the total Interference Index for a channel, issue the CLI command show ap arm rf-summary ap-name <ap-name>,then add the values a+b+c+d.

    Each AP also gathers the following additional metrics, which can provide a snapshot of the current RF health state. View these values for each AP using the CLI command show ap arm rf-summary ip-addr <ap ip address>.

    • Amount of Retry frames (measured in %)

    • Amount of Low-speed frames (measured in %)

    • Amount of Non-unicast frames (measured in %)

    • Amount of Fragmented frames (measured in %)

    • Amount of Bandwidth seen on the channel (measured in kbps)

    • Amount of PHY errors seen on the channel (measured in %)

    • Amount of MAC errors seen on the channel (measured in %)

    • Noise floor value for the specified AP



    ------------------------------
    Herman Robers
    ------------------------
    If you have urgent issues, always contact your Aruba partner, distributor, or Aruba TAC Support. Check https://www.arubanetworks.com/support-services/contact-support/ for how to contact Aruba TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.

    In case your problem is solved, please invest the time to post a follow-up with the information on how you solved it. Others can benefit from that.
    ------------------------------

    Original Message