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Occasional Contributor I
Posts: 7
Registered: ‎09-20-2013

How to confirm interference from Nearby AP%27s%2C rogue devices etc..

I have a bunch of AP 135 deployed and users seem to be having performance issues on the guest network. There is a hint of interference and rogue AP's on AMP as well as WMS but I am unable to pin point and confirm that the performance issues are due to interference from a rogue AP or another device. " show wms ap list" shows a lot of interfering devices, rogue AP's as well, but i still want to arrive to a much more certain conclusion. "show wms monitor-summary" also shows a lot of interfering AP's and many suspected Rogue's , but I want to pin point on the location with stats to confirm where the user is experiencing the problem..

Occasional Contributor I
Posts: 7
Registered: ‎09-20-2013

Re: How to confirm interference from Nearby AP%27s%2C rogue devices etc..

what does the above "interfering" means ? 

 #show wms client aa:bb:cc:dd:EE:ff

STA Info
--------
MAC Type Status Ageout HT-Type
--- ---- ------ ------ -------
 aa:bb:cc:dd:EE:ff interfering up -1 HT-20mhz

MVP
Posts: 4,269
Registered: ‎07-20-2011

Re: How to confirm interference from Nearby AP%27s%2C rogue devices etc..

 

 

Do you know which users are experiencing issues ? if you do then you could look those up in airwave and see what APs are those users have connected to and then you can run the following :

 

This will tell how close that rogue device is based on the RSSI values

(controller) #show  ap monitor ap-list ap-name Test_125_2

Monitored AP Table
------------------
bssid              essid              chan  ap-type      phy-type        dos      dt/mt          ut/it  encr            nstas  avg-rssi  curr-rssi  wmacs  ibss
-----              -----              ----  -------      --------        ---      -----          -----  ----            -----  --------  ---------  -----  ----
c0:c1:c0:34:2b:20  rogue              6     interfering  80211b/g-HT-20  disable  10915/269      4/0    open            0      23        22         0      no
d8:c7:c8:88:99:44  test_ssid          6     valid        80211b/g-HT-20  disable  10856/269      43/2   wpa2-8021x-aes  1      31        31         1      no

 

You can also run the following to see if the Interference Index or noise level are high on the channel assigned to that AP

(controller) # show  ap  arm rf-summary ap-name Test_125_2

Channel Summary
---------------
channel  retry  phy-err  mac-err  noise  util(Qual)    cov-idx(Total)  intf_idx(Total)
-------  -----  -------  -------  -----  ----------    --------------  ---------------
36       0      0        0        89     1/0/1/0/97    6/0(6)          0/0//0/0(0)
40       0      0        0        88     5/0/2/0/97    0/0(0)          0/9//0/0(9)
44       0      0        0        93     8/2/2/0/94    3/0(3)          28/12//0/0(40)
48       0      0        0        89     8/2/2/0/96    7/0(7)          37/9//0/0(46)
149      0      0        0        93     3/0/0/0/96    0/0(0)          0/0//0/0(0)
153      0      0        0        93     5/0/2/1/97    0/0(0)          0/16//0/0(16)
157      0      0        0        93     8/2/2/0/96    10/0(10)        51/0//0/0(51)
161      0      0        0        91     5/0/2/3/97    0/0(0)          0/15//0/0(15)
165      0      0        0        96     5/0/2/0/97    0/0(0)          0/0//0/0(0)
1        0      0        0        90     28/21/5/0/90  8/0(8)          82/24//0/0(106)
6        0      0        0        88     22/17/0/7/64  25/0(25)        149/34//0/0(183)
11       0      0        2        92     16/9/5/0/98   7/0(7)          122/24//0/0(146)

Columns:util(Qual): ch-util/rx/tx/ext-ch-util/quality

HT Channel Summary
------------------
channel_pair  Pairwise_intf_index
------------  -------------------
149-153       16
36-40         9
157-161       66
44-48         86

Interface Name           :wifi0
Current ARM Assignment   :36+/18
Covered channels a/g     :3/0
Free channels a/g        :5/0
ARM Edge State           :disable
Last check channel/pwr   :32s/3m:45s
Last change channel/pwr  :3h:1m:48s/3h:1m:48s
Next Check channel/pwr   :7m:21s/2m:34s
Assignment Mode          :Single Band

Interface Name           :wifi1
Current ARM Assignment   :11/12
Covered channels a/g     :0/2
Free channels a/g        :0/1
ARM Edge State           :disable
Last check channel/pwr   :3m:16s/2m:23s
Last change channel/pwr  :1h:42m:3s/1h:42m:3s
Next Check channel/pwr   :3m:0s/2m:36s
Assignment Mode          :Single Band

 

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
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