ExtremeWireless (Identifi)

Expand all | Collapse all

How to determine if AP is operating in 4x4:4

  • 1.  How to determine if AP is operating in 4x4:4

    Posted 08-02-2018 09:12
    - 3935i-ROW on FW 10.41.06.0013
    - patched to HP J9148A 2910al-48G-PoE+ Switch

    AP Inventory report shows LAN1 using AF and not AT. Switch is capable of delivering 33W on a port. I'm still investigating but it appears disabling LLDP PoE negotiation on the HP switch via command:
    no lldp config dot3TlvEnable poe_config[/code]... resolves the issue and AP Inventory report shows LAN1 using AT.

    I just want to be certain that after doing this the AP is indeed operating in 4x4:4 MU-MIMO. Is there a way to tell, perhaps via logs on the AP?


  • 2.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-02-2018 10:16
    You'd trace the 802.11 beacon frames and check the supported speeds or connect with a client that is capable of that and then check the MCS that the client is using near the AP.

    https://en.wikipedia.org/wiki/IEEE_802.11ac#Data_rates_and_speed



  • 3.  RE: How to determine if AP is operating in 4x4:4



  • 4.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-02-2018 10:47
    Hi Dennis,

    if you log in to the AP then you can ask for # ifconfig and you should see the data rate.

    Regards

    Umut Aydin


  • 5.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-03-2018 10:28
    Hi Denis,

    sorry my mistake..
    Please try #iwconfig ath0

    Regards
    Umut


  • 6.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-02-2018 10:16
    Ronald, can you expand on that? I assume tracing would involve a client with Wi-Fi adapter in monitor mode? Thanks.


  • 7.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-02-2018 10:47
    Thanks Umut. I take it wifi0 = 5GHz band and wifi1 = 2.4GHz. I don't see data rate, only total RX and TX, example:
    CA-L1-SOUTHEAST# ifconfig wifi0
    wifi0 Link encap:UNSPEC HWaddr D8-84-66-7B-97-00-F0-BE-00-00-00-00-00-00-00-00
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:1076129 errors:0 dropped:0 overruns:0 frame:0
    TX packets:2150922 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:2699
    RX bytes:172031006 (164.0 MiB) TX bytes:2892170894 (2.6 GiB)
    Interrupt:68 [/code]
    [/code]


  • 8.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-02-2018 10:47
    Dennis

    The command is iwconfig, not ifconfig.

    With LLDP enabled on your switch in the AP reports, do you see lldp-med-overide, next to where it says "AF" - take a look at this article: https://gtacknowledge.extremenetworks.com/articles/Solution/AP3935-on-S8-switch-operates-on-802-3af-mode-2x2-MIMO-AP-should-detect-802-3at-via-LLDP/

    -Gareth


  • 9.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-02-2018 10:47
    Hi Gareth, yes it does for some APs at a particular site. I do not (yet) have access to the switch at this site so I cannot confirm if LLDP is enable or disabled.

    I understand LLDP-MED is an extension of LLDP, but what does this mean for my scenario. Thanks.


  • 10.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-02-2018 10:47
    You're correct, lldp-med extension includes, amongst other things, improve power management for POE end points.

    This article might help to answer your questions: https://gtacknowledge.extremenetworks.com/articles/Q_A/How-does-PoE-device-classification-work

    -Gareth


  • 11.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-02-2018 13:36
    Thanks Doug. I have seen that article. Whether Low Power Mode Override is enabled or not does not seem to make a difference. I still see "20 sec in cycle 102: AP powered by AF instead of AT PS, entering low power mode(2x2 R1,2x2 R2)" in AP logs even when switch port is configured to deliver 30W.


  • 12.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-02-2018 13:36
    You might want to look into this post - not the same vendor but the same issue and how I was able to solve it with the help of the community.

    https://community.extremenetworks.com/extreme/topics/ap3935i-row-on-08h20g4-24p-ap-powered-by-af-ins...


  • 13.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-03-2018 10:28
    Thank you. Showing:

    Bit Rate:800 Mb/s Tx-Power:18 dBm


  • 14.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-03-2018 10:28
    Dennis

    Are you running 40Mhz wide channel with SGI, then this is correct, check the data rates in this table: http://mcsindex.com/

    -Gareth


  • 15.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-03-2018 10:28
    I can confirm 40Mhz channel width and SGI.


  • 16.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-03-2018 10:28
    Although channel width is set to 40Mhz the bitrate on some APs is 1.7Gb/s. The only difference I can see between these APs and the ones showing 800Mb/s is that on the 1.7Gb/s APs the setting "Active OBSS channel width adjustment" is enabled.


  • 17.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-03-2018 10:28
    could you please post a screenshot of the radio#1 GUI settings for such a AP.


  • 18.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-03-2018 10:28


  • 19.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-03-2018 10:28





  • 20.  RE: How to determine if AP is operating in 4x4:4

    Posted 08-03-2018 10:28
    BTW, the above settings are for an AP that is reporting 800Mb/s bitrate.