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Registered: ‎06-09-2014

I've got a customer with busy channels. How do you go about troubleshooting that?

I've got a customer with busy channels. How do you go about troubleshooting that?

 

According to the dashboard, there's not much interference.  What could be causing this?  How would one confirm/troubleshoot what the source of the problem is?

MVP
Posts: 4,179
Registered: ‎07-20-2011

Re: I've got a customer with busy channels. How do you go about troubleshooting that?

If you have sticky devices attached transmitting at very low data rate , too many APs , using 40 or 80 MHz channels when there's too many APs

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
MVP
Posts: 4,179
Registered: ‎07-20-2011

Re: I've got a customer with busy channels. How do you go about troubleshooting that?

Run the following to a couple of your APs in question:
show ap arm rf-summary ap-name
Show ap arm history ap-name
Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
New Contributor
Posts: 4
Registered: ‎06-09-2014

Re: I've got a customer with busy channels. How do you go about troubleshooting that?

[ Edited ]

 

#show ap arm rf-summary ap-name 

 

Channel SummaryPreview

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

channel  retry  phy-err  mac-err  noise  util(Qual)    cov-idx(Total)  intf_idx(Total)

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

36       0      0        0        92     0/0/0/0/90    8/0(8)          42/0//0/0(42)

40       0      0        0        92     12/0/2/0/90   0/0(0)          0/34//0/0(34)

44       0      0        0        93     12/0/2/0/89   12/0(12)        60/0//0/0(60)

48       0      0        0        92     12/0/2/0/90   0/0(0)          0/20//0/0(20)

149      0      0        0        93     5/1/0/0/89    3/0(3)          28/0//0/0(28)

153      0      0        0        93     12/0/2/0/90   0/0(0)          0/14//0/0(14)

157      0      0        0        93     12/0/11/0/90  8/0(8)          15/2//0/0(17)

161      0      0        0        93     13/1/2/0/89   0/0(0)          5/5//0/0(10)

165      0      0        0        96     12/0/2/0/90   0/0(0)          0/3//0/0(3)

1        0      0        0        90     0/0/0/0/76    18/0(18)        178/50//134/2(364)

6        0      0        0        91     97/72/2/2/77  11/0(11)        126/56//15/30(227)

11       0      0        1        96     60/48/2/0/90  9/0(9)          81/21//0/2(104)

 

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

 

HT Channel Summary

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

channel_pair  Pairwise_intf_index

------------  -------------------

149-153       42

36-40         76

157-161       27

44-48         80

 

Interface Name           :wifi0

Current ARM Assignment   :157+/24

Covered channels a/g     :3/0

Free channels a/g        :5/0

ARM Edge State           :enable

Last check channel/pwr   :3m:37s/5m:22s

Last change channel/pwr  :1h:2m:48s/1h:2m:48s

Next Check channel/pwr   :1m:50s/56s

Assignment Mode          :Single Band

 

Interface Name           :wifi1

Current ARM Assignment   :11/12

Covered channels a/g     :0/3

Free channels a/g        :0/0

ARM Edge State           :enable

Last check channel/pwr   :4m:3s/2m:1s

Last change channel/pwr  :11m:48s/6m:38s

Next Check channel/pwr   :11s/5m:50s

Assignment Mode          :Single Band

 

 

 show ap arm history ap-name 

 

Interface :wifi0

ARM History

-----------

Time of Change       Old Channel  New Channel  Old Power  New Power  Reason

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

2014-06-22 22:56:06  157+         157+         21         24         P+

2014-06-19 12:38:46  157+         157+         24         21         P-

2014-06-19 12:36:34  36+          157+         24         24         I

2014-06-19 12:25:22  161-         36+          24         24         M

2014-06-19 11:31:24  36+          161-         24         24         I

2014-06-19 11:05:12  161-         36+          24         24         I

2014-06-19 09:32:47  36+          161-         24         24         I

2014-06-19 08:59:15  161-         36+          24         24         I

2014-06-18 23:47:11  36+          161-         24         24         I

2014-06-18 23:12:36  161-         36+          24         24         I

2014-06-18 22:42:58  40-          161-         24         24         I

2014-06-18 21:59:56  161-         40-          24         24         I

2014-06-18 20:52:23  48-          161-         24         24         I

2014-06-18 20:48:16  48-          48-          24         18         P-

2014-06-18 20:47:48  40-          48-          24         24         I

2014-06-18 20:03:32  161-         40-          24         24         I

2014-06-18 18:44:31  40-          161-         24         24         I

2014-06-18 17:49:42  161-         40-          24         24         I

2014-06-18 17:29:27  40-          161-         24         24         I

2014-06-18 16:26:34  161-         40-          24         24         I

2014-06-18 13:16:25  161-         161-         21         24         P+

2014-06-18 13:02:02  161-         161-         18         21         P+

2014-06-18 12:55:20  161-         161-         15         18         P+

2014-06-18 12:48:50  161-         161-         12         15         P+

2014-06-18 12:45:54  36+          161-         12         12         I

2014-06-18 12:29:05  36+          36+          18         12         P-

2014-06-18 12:08:46  36+          36+          24         18         P-

2014-06-18 12:05:58  161-         36+          24         24         I

2014-06-18 11:29:39  161-         161-         21         24         P+

2014-06-18 11:25:21  161-         161-         18         21         P+

2014-06-18 11:18:31  161-         161-         15         18         P+

2014-06-18 10:56:41  161-         161-         12         15         P+

Interface :wifi1

ARM History

-----------

Time of Change       Old Channel  New Channel  Old Power  New Power  Reason

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

2014-06-23 13:11:56  11           11           9          12         P+

2014-06-23 12:34:55  11           11           12         9          P-

2014-06-23 12:29:42  11           11           9          12         P+

2014-06-23 11:40:09  11           11           12         9          P-

2014-06-23 11:32:23  11           11           9          12         P+

2014-06-23 10:49:46  11           11           12         9          P-

2014-06-23 10:43:16  11           11           9          12         P+

2014-06-23 10:12:29  11           11           12         9          P-

2014-06-23 10:08:01  11           11           9          12         P+

2014-06-23 10:02:11  11           11           12         9          P-

2014-06-23 09:56:31  11           11           18         12         P-

2014-06-23 09:01:22  11           11           15         18         P+

2014-06-23 08:54:42  11           11           12         15         P+

2014-06-23 08:48:28  11           11           9          12         P+

2014-06-23 08:31:57  11           11           12         9          P-

2014-06-23 08:25:57  11           11           9          12         P+

2014-06-23 08:21:10  11           11           12         9          P-

2014-06-23 08:13:40  11           11           9          12         P+

2014-06-23 08:06:08  11           11           15         9          P-

2014-06-23 08:00:10  11           11           21         15         P-

2014-06-23 07:53:18  11           11           18         21         P+

2014-06-23 07:42:58  11           11           15         18         P+

2014-06-23 07:26:45  11           11           12         15         P+

2014-06-23 07:17:28  11           11           9          12         P+

2014-06-23 07:09:35  11           11           12         9          P-

2014-06-23 07:05:18  11           11           15         12         P-

2014-06-23 06:58:54  11           11           12         15         P+

2014-06-23 06:52:14  11           11           9          12         P+

2014-06-23 06:44:29  11           11           12         9          P-

2014-06-23 06:36:40  11           11           9          12         P+

2014-06-23 06:32:17  11           11           12         9          P-

2014-06-23 06:28:07  11           11           9          12         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

 

Aruba
Posts: 1,368
Registered: ‎12-12-2011

Re: I've got a customer with busy channels. How do you go about troubleshooting that?

There could be many items which cause channel utilization - 

 

- Client Usage

- Other APs/Rogues around the AP

- Interference sources

- in a dense deployment, too many APs can hear each other or APs are receiving data which is can be disabled

 

In order to find root cause, it is adviseable to open up a support case and start there.  

 

For more help here, it would be good to know how many APs are out here are if you are in a dense deployment and if the util. is on 2.4, 5 or both?

 

If you have Airwave, we have an extrodinarily useful dashboard called "RF Capacity" which can plot out the radios over a trailing 7 days to show peak utilization as compared to client count with the ability to drill down for more root cause analysis!

Seth R. Fiermonti
Consulting Systems Engineer - ACCX, ACDX, ACMX
Email: seth@hpe.com
-----
If you found my post helpful, please give kudos
MVP
Posts: 4,179
Registered: ‎07-20-2011

Re: I've got a customer with busy channels. How do you go about troubleshooting that?

It looks like you have issues on your 5 Ghz channels a lot of interference .
are you using 40 Mhz channels ?
Do you have a very dense setup ?
Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
New Contributor
Posts: 4
Registered: ‎06-09-2014

Re: I've got a customer with busy channels. How do you go about troubleshooting that?

Thank you for the reponses, guys.

 

How would I know if I'm using 40 MHz channels?

 

Interestingly, the dashboard doesn't show that I have much interference.  

Aruba
Posts: 1,368
Registered: ‎12-12-2011

Re: I've got a customer with busy channels. How do you go about troubleshooting that?

In the show ap active output, look at the 5GHz column.  If it says "VHT", you're on 80.  If it says HT, you're on 40.

 

HT stands for high throughput

VHT stands for very high throughput

Seth R. Fiermonti
Consulting Systems Engineer - ACCX, ACDX, ACMX
Email: seth@hpe.com
-----
If you found my post helpful, please give kudos
New Contributor
Posts: 4
Registered: ‎06-09-2014

Re: I've got a customer with busy channels. How do you go about troubleshooting that?

It's 40 MHz.  Also, all of the clients are dropping after a few minutes of association. When they re-associate, they work fine for a few minutes and then drop.

MVP
Posts: 4,179
Registered: ‎07-20-2011

Re: I've got a customer with busy channels. How do you go about troubleshooting that?

 

If you see + or a - next to the channel that means you are using 40 Mhz and 80 Mhz you will see an E next to the channel

2014-06-23 15_53_03-Re_ I've got a customer with busy channels. How do you go about troubleshooting .png

Thank you

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