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Ubiquity UNify UAP problem with link flapping

Posted on 2016-10-17
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Last Modified: 2016-10-24
We have a customer that has a number of Ubiquity Unify UAP WIFI APs installed.  They are all experiencing the same issue.  The laptops stay connected to the WIFI and signal strength is strong.  But they are dropping their RDP and Client/Server sessions intermittently.  Ping tests show that the latency comes and goes in waves (sometimes 9ms, sometimes 400ms) and it is dropping packets (15%).  Then it will be good for a few minutes, then bad again.

Looking at the switch, the port is set to Auto.  The connection speed is 100 half duplex.  Setting the switch port to 100 Full does not help.  In fact, the problem gets a little worse.

We took a laptop, disabled WIFI, and plugged it in hardwire to the port that the AP is on, and the laptop preformed flawlessly.
We took the AP and plugged it into another switch port, and the problems continued.

This problem seemed to start about several weeks after upgrading the controller software and unit firmware to the latest versions.  But because it didn't start happening immediately, I'm dubious as to that being the cause.  And I've heard that downgrading firmware on these can easily brick the unit.

Anyone have a better idea before we warm up the Kiln?

Thanks.
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Question by:cef_soothsayer
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Expert Comment

by:masnrock
ID: 41846817
What type of switch do you have, and is everything with it up to date?
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Author Comment

by:cef_soothsayer
ID: 41847294
Firmware & controller software on UAPs has been updated.
Switches are manageable HP Smart Stack 2810a-48G
Have already tried different ports.
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Accepted Solution

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masnrock earned 500 total points
ID: 41847332
I'm wondering if it's something about the switch or the controller. Could you put a small switch on the side and see what happens? But also, are you noticing anything in the UniFi controller itself?
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Author Comment

by:cef_soothsayer
ID: 41848198
>> Could you put a small switch on the side and see what happens?

Already recommended that the other day.  Client is remote, and is buying a small workgroup switch to try it with.

>>But also, are you noticing anything in the UniFi controller itself?

Nope.  Eerily calm.
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Expert Comment

by:masnrock
ID: 41851980
Just writing to see if you've heard anything from the client.
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Author Comment

by:cef_soothsayer
ID: 41852166
Nothing yet.  Expect to talk with him today.
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Expert Comment

by:masnrock
ID: 41857141
Hopefully at least most of those APs are still under warranty. I'd be going after Ubiquiti assuming using the other switch doesn't help.
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Author Comment

by:cef_soothsayer
ID: 41857903
We put the UAP APs on a small 8 port work-group class gigabit switch and then connected the work-group switch to the  HP stack in the original port that the AP was in. (unmanageable work-group switch is set to auto obviously)

Works Great.  No more dropped packets.  No more lost connections.

Client is looking at replacing the six HP stack 48 port manageable switches on the upcoming annual budget, as the HPs are almost 10 years old anyway.

Thanks.
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Author Closing Comment

by:cef_soothsayer
ID: 41857905
Just a band-aid solution, but found the issue.
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Expert Comment

by:masnrock
ID: 41857914
Great to hear that helped your issue dramatically. You might be able to get the client to even look into a switch that can power the APs, which would cut out the need for injectors if that's what you're using.
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