APs drop clients, slow connections or no connections....

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Have a mix of 230 and 320 APs - 78 in total, in a school environment.  Issue is dropping or no connection, or slow internet, for some.  Bascially unreliable to the point where staff are not using wifi devices for lessons.  APs run on 6.1r6 Enterprise.  One suggestion was an excess of tx data (44% on one AP, 174% on another) was causing issues.  Dropped the 2.4ghz signal strength or turned off on alternate APs in one dense location. This has not had any noticeable effect on the issue.  WIPS is not enabled.  I'm at a loss and am currently waiting on an engineer visit to help solve.  Any other thoughts?  

I can add that we did just this past summer replace our HP switchgear with new Cisco 2960 and 3850 switches.

Thank you.
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Domain Admin

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Posted 4 years ago

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Sjoerd de Jong, Employee

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Far fetched maybe... But is it possible that your Cisco Switches have port security enabled? This can cause AP's to (based on the cisco port security settings) have a max of 3 clients that can connect.

Where are you situated?
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Domain Admin

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CT, USA
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Domain Admin

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And thank you, I will check on this tomorrow. Chris
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Gary Smith, Official Rep

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A few of questions for you.

1 - Are the AP models mixed in the areas that they are deployed? E.g. AP230 in same areas as AP320?
2 - Are you using default Radio Profiles for the AP230's? They will use 80MHz wide channels and this may have an adverse affect on the 5GHz spectrum if not properly planned.
3 - Does you have issues on both 2.4GHz and 5GHz radios or is the issue specific to one band?
4 - Are connectivity issues seen on all AP models or just one model? Are the issues the same?

Kind Regards,
Gary Smith
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Domain Admin

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Gary,

1 - Yes, they are a mix of 320s and 230s.  Newer 230s were added at a later date to fill holes.
2 - Yes default radio profiles on all.    Should high density WLAN be enabled on all radio profiles?  I noticed there are 18 profiles on the config page.  We do see high CPU usage on some APs every day, up to 100%.  I understand certain APs can be interfering with neighbors, and I have seen tx retry rates on average of 44% but on one as high as 174%.
3 - I am not sure, but both bands are enabled.  I have since turned down to a level 2 or 4 2.4GHz radios on every other AP (classroom), or others which are considered close.
4 - Connectivity issues:  dropped internet service, but client stays connected. Sometimes a disconnect and reconnect will return inet service.  Some clients slow if impossible to connect.  Service sometimes ok for several hours, then increasingly worse as the day progresses.  Can occur at all hours, but worse in high traffic.  Oddly, network printers seem to cease printing when wifi issue first erupts, then they self correct.

Checking on port security on new Cisco switches, though we are fine on the wired side.  Have an engineer experienced with Aerohive scheduled for an on site visit this Tuesday, which is not soon enough...

Thank you,
Chris
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Domain Admin

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Created new radio profiles at reduced rates and applying globally....
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Gary Smith, Official Rep

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Hi Chris,

You have described 2 potential issues.

1 - being RF which you are addressing right now.
2 - High CPU. If the CPU goes to 100% there is a good chance that the AP will not service clients. This should be looked at by Aerohive support.

For the high CPU can you collect "show cpu detail" and "show system processes state" when the CPU is high. We can then look at what might be the process which is using the CPU.

Kind Regards,
Gary Smith
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phil stokes

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I'm experiencing very similar issues, I haven't checked on RF/CPU yet but I will certainly get in and do that now. We have almost 200 AP's ranging from 120/121-330's and have users complaining of these same things. The issues I notice seem to relate to the 120's which we are currently in the process of upgrading to the 230's and eliminating most of our 120's.
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Crowdie, Champ

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Gentlemen, did either of you get a resolution to your performance issues?
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Domain Admin

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I believe at this point the issue lies on our wired side.  We are implementing vlans as soon as possible on our new switches and anticipate seeing an improvement.  Thank you. Chris
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cabrower

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Were you able to find a resolution to this issue? We are experiencing a similar issue in our environment and have traced it down to the wired side as well. We are seeing a ton of multicast traffic to our AP121s which is causing the CPU to hit 100%. Our AP 330s are able to handle the additional multicast traffic. When we turn off the Bonjour gateway it brings the APs down to normal CPU levels.

We have about 1200 ipads and 50-100 AirPlay devices (AppleTV, AirServer)
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Domain Admin

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We recently upgraded our infrastructure with the installation of all new Cisco 3850 and 2960 switches.  What we lacked was a solid vlan design to suit our environment.  Bringing in a new engineer was our solution.  It appears we simply had an excess of broadcast traffic and sheer volume for the original design.  While we are not yet complete in the vlan implementation, parts of the plan have been implemented and yes, Aerohive does now simply work, and work well.  

That said, we do have two APs (out of our 78 total) which drop connection or simply will not issue an IP and hold it.  They share a common POE switch.  However, there are maybe 6 others AP populating the switch which are ok.  I am going to cause it to the vlans again, but have not had this verified yet.  It will be addressed soon.  I have ruled out the wiring and APs themselves, have cabled directly into the switch and trying a few known good mobile APs we have, with same results.
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cabrower

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What is the CPU % on your APs?
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Domain Admin

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I chose six at random, and they all are within 5% and 12% usage. Prior to implementing new vlans, they are maxing out at 100%.
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cabrower

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What does your new VLAN Layout look like?
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Chris Gapske

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I am beginning to think this issue is related to Aerohive as a whole. Never before have I had so many problems with wireless.  An Asus AP for 1/5th the price does circles around this equipment.  We have had nothing but regret and tears using Aerohive.   From the over p[riced equipment to the under preforming software. I truly do not know how they got off the ground. 
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Mike Kouri, Official Rep

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You joined the forum just to say this? 
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Chris Gapske

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Nope I joined it to look at a solution to this problem. When I have found  so many comments with this problem it appears  I am not the only one. 
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Bill W.

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If this is your problem, then you should see that the resolution had to do with poor configuration of the switches and not with Aerohive.

If you haven't dealt with enterprise wireless solutions before, you may think that Aerohive is over priced and the software may not be as "simple" to use as consumer products.  But if you have dealt with enterprise wireless solutions, you will find that it isn't over priced and the software is not under performing.

I've used Alcatel, Meru Wireless, Aruba Wireless, and Xirrus (not really enterprise though) solutions, and Aerohive has been much better for us than any of those.

And our deployment is over 10,000 APs spread over 170+ sites.

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Chris Gapske

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We may only have 1700 currently but I have managed networks with far more.  Gui is a little slow but better but the hardware 120,121 so many issues with ver of software over the last 3 years. Every one we have to check and always find something.  It has been huge growing pains. 
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Eddie Klaczko

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Not sure what specific issues you were having, but I've found their Support Engineers and TAC to be very responsive and helpful when we first started rolling out.  No enterprise gear will have the ease of initial configuration as consumer products do.  So I find it tough to make comparisons between these products.  Don't get frustrated and reach out to your sales team and/or TAC.  Enterprise level support is one of the benefits you receive for the price you pay.  I've found Aerohive's support as good and even better in some cases that other vendor's I've dealt with.
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John Fabry

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So reading through the string. I take it that the fix is related to broadcast traffic and the solution is setting up VLANs on the wired side. In what way (methodology) did you use VLANs. Did you separate students from staff or did you segment IP numbers to cut down the collision domains?
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Abou Ammar Alyahyai

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i have problem in our wireless (loss packet )
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Crowdie, Champ

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It has become very obvious over the last twelve months that there is a large difference between the supported features on enterprise access points and commonly deployed wireless clients.  This commonly creates wireless performance issues and I have found that disabling the advanced features on the access points improves this.

Here are some of my recommendations:

  1. If your access point supports the 6.5 firmware line then use it.  The AP1130, in particular, performs better with 6.5r8 than the 8.x firmware versions. 
  2. Disable all data rates lower than 12 Mbps.  Have a single basic (mandatory) data rate of 12 Mbps.  All data rates higher than 12 Mbps should be optional.
  3. Disable DFS channels (unless you absolutely need them).
  4. Have the smallest 5 GHz channel width possible.  The 2.4 GHz channel width should always be 20 MHz.
  5. Disable Frame Burst, Transmit Beamforming and MU-MIMO (if applicable).
  6. Disable load balancing.
  7. Disable "selective response to probe requests".
  8. Disable all high-density WLAN settings.
  9. Drop the maximum clients from 100 to 20 or 30.
  10. Deny 802.11b clients.
  11. Ensure the SLA Settings in the radio profile are correct for your deployment.
  12. If you are using IP Policies (the access point firewall) keep the rule list of short as possible.  If you don't really need a rule don't have it.
  13. Don't enable a Bonjour Gateway unless you actually need one.
(Edited)