Wireless Access

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Frequent Contributor II

Re: Clients seem to randomly lose access

If you look at the ARM history you'll see that a lot of channel-switches are occuring (by ARM), those can be disruptive.

 

Questions:

 

- Are there muching AP's on the same channel active?

- What is the noise-floor the AP's are reporting?

 

If you have lots AP's on the same channel (at least for 5GHz), you could consider moving to 20MHz channels (instead of 40MHz as it seems to be know).


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Frequent Contributor I

Re: Clients seem to randomly lose access

Hello,

 

Where do I check the noise floor?

 

We have a dozen APs so yes they are all on 1, 6 or 11.   There isn't a lot of switching between channels but there is some.


Can you let me know where to go to change from 20 to 40hz?

Highlighted
Guru Elite

Re: Clients seem to randomly lose access


@boe wrote:

Hello,

 

Where do I check the noise floor?

 

We have a dozen APs so yes they are all on 1, 6 or 11.   There isn't a lot of switching between channels but there is some.


Can you let me know where to go to change from 20 to 40hz?


The noise should be a column on the AP display in the GUI.

 

You can change from 40 to 20 by going to RF> Advanced and Change "Wide Channel Bands" to "None".  Did you change the "Min Transmit Power" on that page to 9?

 


*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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Frequent Contributor I

Re: Clients seem to randomly lose access

Thanks,

 

In the RF Dashboard section I see

All access points - utilization, noise and errors with only 1 green bar at the bottom of each.

 

In RF advanced, ARM, I see

Band steering mode - prefer 5GHz

Airtime fairness - fair access

Client match - enabled

CM Calculating interval 3 sec

CM neighboring match 75%

CM threshold 5

SLB mode Channel,

min transmit 3

Max 21

Client Aware disabled

Scanning Enabled

Wide Channel bands and my choices are 5GHz, none, all, 2.4GHz

I have 80MHz support and my choices are disabled, enabled

 

RADIO

2.4GHz band

legacy only diabled

802.11d/802.11h disabled

beacon interval 100ms

Interference immunity level 2

Channel switch announcement 0

Background spectrum monitoring disabled

Custom Arm power range (unchecked)

 

5GHz band

legacy only disabled

802.11d/802.11h disabled

beacon interval 100ms

Interference immunity level 2

Channel switch announcement 0

Background spectrum monitoring disabled

Custom Arm power range (unchecked)

Highlighted
Guru Elite

Re: Clients seem to randomly lose access

Why is max transmit as high as 21?  That causes roaming issues an disconnects..

 

On the SSID portion of that SSID, do you have "Broadcast Filter ARP" enabled?

 

 


*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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Frequent Contributor I

Re: Clients seem to randomly lose access

Someone recommended I set a max earlier to help with the disconnects.  I'm happy to try anything to stop the clients from having issues.

 

Currently ARP broadcast filtering is set for disabled - would you suggest enabling it?

 

Currently I have

Broadcast filtering disabled

DTIM interval 1 beacon

Multicast transmission optimization disabled

Dynamic multicast optimization disabled

DMO Channel utilization threshold 90%

 

Transmit Rates

2.4GHz min 12, max 54

5GHz min 12, max 54

Highlighted
Guru Elite

Re: Clients seem to randomly lose access

They recommended a max of 15 or 18. Power is logarothmic, so the power at 18 is half that of 21. 15 is a quarter of that.

*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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Frequent Contributor I

Re: Clients seem to randomly lose access

I tried setting it to 18 and the clients complained they had even more issues.

Highlighted
Guru Elite

Re: Clients seem to randomly lose access

I would open a tac case in parallel, because it seems we are not getting the full picture.

*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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Frequent Contributor I

Re: Clients seem to randomly lose access

Thanks - I've opened a case... Trying to get any info at all from the client e.g. computer name, when they drop, are they stationary or moving...

 

In the mean time would you suggest turning on arp filtering?

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