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Aruba Instant retries problem

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  • 1.  Aruba Instant retries problem

    Posted May 28, 2013 12:50 PM

    Hi guys,

     

    I have a IAP 105 network running 6.2.0.0-3.2.0.3_37632 Aruba OS and I found an strange behaviour: 

     

    retries.png

     

    Many of my clients are showing too much retries in/out in the network. There aren´t noise nor interference problems. 

     

    Could you help me?

     

    Thanks,

    Raúl



  • 2.  RE: Aruba Instant retries problem

    Posted May 29, 2013 03:13 PM

    Hi Raul,

     

    Check the switch ports that the AP's are connected to.  I saw a similar problem before and it was due to a speed/duplex mismatch between the AP and the switch port that it was connected to.



  • 3.  RE: Aruba Instant retries problem

    Posted May 31, 2013 12:38 AM

     

    You should try going to the support tab and running the following commands on that particular AP and the output will give you a better understanding of your RF environment :

     

    AP monitor ap table

     

    AP arm history

    AP arm rf summary

    AP arm neighbors 

     

    Screen Shot 2013-05-31 at 12.42.34 AM.png



  • 4.  RE: Aruba Instant retries problem

    Posted May 31, 2013 06:59 AM

    Hi,

     

    Thank you, I checked the switch (it´s and old one) and I changed the port and also I tried to connect directly in the DSL router and the result was the same. I should try to change the physical mode from auto to 1000.

     

    I´m going to run that commands and I will keep you posted,

     

    Regards,

    Raúl



  • 5.  RE: Aruba Instant retries problem

    Posted Jun 03, 2013 04:38 AM

    Hi,

     

    Here is the output of that ARM commands. I attached it as Office table.

           
           
           
           
    *********************************************************************************************************
     5/31/2013 14:22:00 PM    Target: AP_PB_izq    Command: show ap arm rf-summary 
    *********************************************************************************************************
           
    Channel Summary     
    ---------------      
    channel  retry  phy-err  mac-err  noise  util(Qual)     cov-idx(Total)  intf_idx(Total)
    -------  -----  -------  -------  -----  ----------     --------------  --------------- 
    36       0      0        0        93     0/0/0/0/95     0/0(0)          0/0//0/0(0)  
    40       0      0        0        93     5/0/0/0/95     0/0(0)          0/0//0/0(0)  
    44       0      0        0        93     0/0/0/0/100    8/0(8)          0/0//0/0(0)  
    48       0      0        0        93     5/0/0/0/95     0/0(0)          0/10//0/0(10)  
    52       0      0        0        93     0/0/0/0/94     5/0(5)          29/0//0/0(29)  
    56       0      0        0        93     5/0/0/0/95     0/0(0)          0/19//0/0(19)  
    60       0      0        0        93     0/0/0/0/94     5/0(5)          28/0//0/0(28)  
    64       0      0        0        93     5/0/0/1/95     0/0(0)          0/9//0/0(9)  
    100      0      0        0        93     0/0/0/0/94     0/0(0)          28/0//0/0(28)  
    104      0      0        0        93     5/0/0/0/95     0/0(0)          0/9//0/0(9)  
    108      0      0        0        93     0/0/0/0/95     0/0(0)          0/0//0/0(0)  
    112      0      0        0        93     5/0/0/0/95     0/0(0)          0/0//0/0(0)  
    116      0      0        0        93     0/0/0/0/95     0/0(0)          0/0//0/0(0)  
    120      0      0        0        93     5/0/0/0/95     0/0(0)          0/0//0/0(0)  
    124      0      0        0        93     0/0/0/0/95     0/0(0)          0/0//0/0(0)  
    128      0      0        0        93     5/0/0/0/95     0/0(0)          0/0//0/0(0)  
    132      0      0        0        93     0/0/0/0/95     0/0(0)          0/0//0/0(0)  
    136      0      0        0        93     5/0/0/0/95     0/0(0)          0/0//0/0(0)  
    140      0      0        0        95     6/0/0/0/94     0/0(0)          0/0//0/0(0)  
    1        0      0        0        71     10/6/1/0/50    0/0(0)          0/13//0/0(13)  
    6        38     0        0        94     41/26/11/0/62  18/0(18)        70/11//0/0(81) 
    11       0      0        0        91     52/49/0/0/97   10/0(10)        65/12//0/0(77) 
           
    Columns:util(Qual): ch-util/rx/tx/ext-ch-util/quality  
           
    HT Channel Summary     
    ------------------     
    channel_pair  Pairwise_intf_index    
    ------------  -------------------    
    116-120       0      
    52-56         48      
    100-104       37     
    124-128       0      
    36-40         0      
    60-64         37      
    108-112       0      
    132-136       0      
    44-48         10      
           
    Interface Name           :wifi0    
    Current ARM Assignment   :44+/24    
    Covered channels a/g     :3/0    
    Free channels a/g        :15/0    
    Last check channel/pwr   :7m:3s/5m:55s   
    Last change channel/pwr  :1d:5h:46m:40s/1d:5h:46m:13s  
    Next Check channel/pwr   :9s/58s    
    Assignment Mode          :Single Band    
           
    Interface Name           :wifi1    
    Current ARM Assignment   :6/15    
    Covered channels a/g     :0/2    
    Free channels a/g        :0/1    
    ARM Edge State           :disable    
    Last check channel/pwr   :2m:37s/5m:50s   
    Last change channel/pwr  :1d:5h:44m:13s/1d:5h:44m:6s  
    Next Check channel/pwr   :5m:3s/12s    
    Assignment Mode          :Single Band    
           
    *********************************************************************************************************
     5/31/2013 14:22:00 PM    Target: AP_PB_izq    Command: show ap arm history  
    *********************************************************************************************************
           
    Interface :wifi0     
    ARM History     
    -----------      
    Time of Change       Old Channel  New Channel  Old Power  New Power  Reason
    --------------       -----------  -----------  ---------  ---------  ------  
    2013-05-30 06:51:21  44+          44+          Max        24         P-  
    Interface :wifi1     
    ARM History     
    -----------      
    Time of Change       Old Channel  New Channel  Old Power  New Power  Reason
    --------------       -----------  -----------  ---------  ---------  ------  
    2013-05-30 06:53:36  6            6            18         15         P-   
    2013-05-30 06:53:30  6            6            24         18         P-   
    2013-05-30 06:53:28  1            6            24         24         Q   
    2013-05-30 06:51:22  1            1            Max        24         P-   
    I: Interference, R: Radar detection, N: Noise exceeded, Q: Bad Channel Quality E: Error threshold exceeded, INV: Invalid Channel, G: Rogue AP Containment, M: Empty Channel, P+: Increase Power, P-: Decrease Power, 40INT: 40MHZ intol detected on 2.4G, NO40INT: 40MHz intol cleared on 2.4G, OFF: Turn off Radio, ON: Turn on Radio
           
    *********************************************************************************************************
     5/31/2013 14:22:00 PM    Target: AP_PB_izq    Command: show ap arm neighbors 
    *********************************************************************************************************
           
    ARM Neighbors     
    -------------      
    bssid              essid           channel  rssi  tx-power  PL (dB)  AP Flags  Last Update (Total updates)
    -----              -----           -------  ----  --------  -------  --------  --------------------------- 
    24:de:c6:bf:05:72  WLAN_1E43       6        29    19        101      Passive     
    24:de:c6:bf:06:c2  WLAN_1E43       6        27    0         0        Passive     
    24:de:c6:bf:06:92  WLAN_1E43       11       21    0         0        Passive     
    24:de:c6:bf:02:a2  WLAN_1E43       11       31    0         0        Passive     
    24:de:c6:be:fa:d2  WLAN_1E43       11       13    19        102      Passive    
    24:de:c6:bf:05:7a  WLAN_1E43       60       27    0         0        Passive     
    24:de:c6:bf:06:ca  WLAN_1E43       100      16    24        102      Passive    
    24:de:c6:bf:06:9a  WLAN_1E43       100      12    24        116      Passive    
    24:de:c6:bf:02:aa  WLAN_1E43       52       29    9         75       Passive     
    02:26:f6:90:2b:90  HPB110a.D5E55F  6        5     0         0        Passive     
    Neighbor Summary:One hop 10 Two hop 0 Current Time: 2013-05-31 13:22:04 

     

    Thanks in advance,

    Raúl



  • 6.  RE: Aruba Instant retries problem

    Posted Jun 03, 2013 03:14 PM

     

    Looks like this device (possibly a wireless printer near by) might be impacting your connection on channel 6 :

     

    02:26:f6:90:2b:90  HPB110a.D5E55F  6        5

     

     

     



  • 7.  RE: Aruba Instant retries problem

    Posted Jun 03, 2013 05:20 PM

    Hi,

     

    I knew about that printer and I told my customer to deactivate the WiFi connection... but I can´t believe that this printer could be enough to be the reason of too many retries and connection problems. It should be just an interference problem... Nevertheless I´m going to ask again my customer to deactivate that printer

     

    Regards,

    Raúl



  • 8.  RE: Aruba Instant retries problem

    Posted Jun 03, 2013 06:25 PM

     

    From the support tab try running the following:

     

    AP Monitor AP Table

     

    This command would allow to see which devices are interfering with your IAP

     

    Monitored AP Table
------------------
bssid              essid            chan  ap-type      phy-type        dos      dt/mt          ut/it    encr          nstas  avg-rssi  curr-rssi  wmacs  ibss
-----              -----            ----  -------      --------        ---      -----          -----    ----          -----  --------  ---------  -----  ----
00:11:22:33:44:55  Linksys           6    interfering  80211b/g-HT-20  disable  543156/536048  0/0      wpa2-psk-aes  0      6         6          0      no

     



  • 9.  RE: Aruba Instant retries problem

    Posted Jun 04, 2013 12:14 PM

    Hi,

     

    I don´t see anything wrong...

     

    Monitored AP Table

    ------------------

    bssid              essid      chan  ap-type  phy-type        dos      dt/mt          ut/it  encr          nstas  avg-rssi  curr-rssi  wmacs  ibss

    -----              -----      ----  -------  --------        ---      -----          -----  ----          -----  --------  ---------  -----  ----

    24:de:c6:bf:05:72  WLAN_1E43  6     valid    80211b/g-HT-20  disable  433308/141481  3/0    wpa-psk-tkip  1      34        34         5      no

    24:de:c6:bf:07:1a  WLAN_1E43  44    valid    80211a-HT-40    disable  433308/433308  0/0    wpa-psk-tkip  1      40        40         16     no

    24:de:c6:bf:07:12  WLAN_1E43  11    valid    80211b/g-HT-20  disable  433308/433308  0/0    wpa-psk-tkip  8      25        25         18     no

    24:de:c6:bf:06:c2  WLAN_1E43  6     valid    80211b/g-HT-20  disable  433307/141548  3/0    wpa-psk-tkip  1      22        26         9      no

    24:de:c6:bf:06:92  WLAN_1E43  6     valid    80211b/g-HT-20  disable  433298/33875   3/0    wpa-psk-tkip  1      22        23         4      no

    24:de:c6:bf:02:a2  WLAN_1E43  11    valid    80211b/g-HT-20  disable  433281/304960  0/0    wpa-psk-tkip  34     30        30         18     no

    24:de:c6:be:fa:d2  WLAN_1E43  11    valid    80211b/g-HT-20  disable  423247/320912  0/0    wpa-psk-tkip  10     9         9          18     no

    24:de:c6:bf:05:7a  WLAN_1E43  60    valid    80211a-HT-40    disable  416715/11591   16/0   wpa-psk-tkip  1      23        23         7      no

    24:de:c6:bf:06:ca  WLAN_1E43  100   valid    80211a-HT-40    disable  399178/11110   29/0   wpa-psk-tkip  4      13        13         5      no

    24:de:c6:bf:06:9a  WLAN_1E43  100   valid    80211a-HT-40    disable  46209/1309     53/1   wpa-psk-tkip  0      0         12         2      no

    Start:0

    Length:10

    Total:10

     

    Any ideas?

     

    Thanks in advance!



  • 10.  RE: Aruba Instant retries problem

    EMPLOYEE
    Posted Jun 04, 2013 01:49 PM

    Is there any way that your clients can use WPA2-PSK-AES?  Full 802.11n speeds are not supported with WPA-PSK-TKIP



  • 11.  RE: Aruba Instant retries problem

    Posted Jun 05, 2013 10:02 AM

    Hi,

     

    That´s a good point. I´ll ensure all the clients are running WPA2-PSK-AES and also I will update this post if it works.

     

    Thanks,

    Raúl



  • 12.  RE: Aruba Instant retries problem

    EMPLOYEE
    Posted Jun 05, 2013 10:19 AM
    @Tejeda wrote:

    Hi,

     

    That´s a good point. I´ll ensure all the clients are running WPA2-PSK-AES and also I will update this post if it works.

     

    Thanks,

    Raúl

    Quite frankly, retries are a factor in congestion and are part of a functioning WLAN, so there is no magic number target.  One network with high density could have up to 50% of traffic be retries, and traffic can be bursty.  A good number is to have less than 30% sustained retries or find out when your clients are okay and measure that number.

     

    If all the numbers are okay, but your clients are complaining, that is a good time to examine what you are doing.  If all of your clients are okay, get a snapshot of that environment to determine what is "normal".  If they are not okay, see how they have changed from the "normal".