01-20-2015 08:56 AM
I was visiting a customer today and saw a very odd behavior.
The network is a school with 32 instant APs one 225 iAP as the preferred VC and the rest 105 iAPs.
My customer tested walking aroud in the building and sometimes his iPad would not roam from AP to AP, sometimes it just took some time before the iPad connected again sometimes he had to shut the WIFI on the iPad and turn it on again and sometimes the iPad connected and got an IP address but had no internet connection.
We also saw the last behavior when sitting at a table not moving around. His iPad was connected but had no internet connection. Around him was 2 iPhones, an iPad and a Surface PRO3 witch had no problem in connecting to the same SSID, and had internet access.
The setup is 4 SSID´s one for school equipment (PSK) one for the students own equipment (PSK), one Guest network with clearpass guest authentication and one SSID for AppleTV´s (PSK)
all of these SSID's has seperate VLANs on the wired network witch consists of 2 Aruba s2500 in stack mode as core and some Cisco SG300 in the 3 other wiring closets.
They are seing alot of problems with roaming on that network mostly on iPads on different software levels.
The instant cluster is running 220.127.116.11-18.104.22.168_46936 software.
We have the whole system on airwave but the only thing i could se when his client was connected without internet was that his MAC address was connected and had an IP address but without any visible hostname.
Airwave stated that his client had a high noise floor (-89) and a lot of lost frames.
I am pretty certain that the problem is on the iPad but how do i start troubleshooting a iPad ?? or could thier be some setting on an instant network that will enable iPads to roam better
Best Regards Jens W
01-20-2015 01:39 PM
Which SSID is suffering from the roaming issue?
ACDX #420 | ACMP
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01-22-2015 01:54 AM
The Client match feature is on.
They are only seeing the problem on the one SSID but that is the mission critical one.
So the problem can also be on the on the other SSID but they just have any focus one them.
The AppleTV's that are wireless also is experiencing some problems though.
01-22-2015 10:05 AM
With roaming issues the two big things we should always check for is ClientMatch and the ARM TX power. Typically the TX power should be set at minimum 12 and maximum 18, unless a specific use case exists for something different. If the power is too high the client will sometimes become "sticky" and refuse to roam to a better AP.
01-22-2015 04:00 PM
MAX and MIN TX is actually set as low as 9 and 6 respectivly.
This is because the AP sits in such close proximity to each other.
There is one AP in every class room and they are no more than 5-7 Meters apart.
01-28-2015 01:00 AM
I'd rather have some clues to how to troubleshoot such a problem with IPads, what could be wrong and what can one do on an IPad in regards to trouble shooting.
01-29-2015 12:37 AM
Hi the setting are as shown in the screenshots.
The customer has on his own set all 5Ghz channels to statinary channels after reading this:
I have only read some of this loooong discussion and can't find any solid evidence that shows that this should be a viable solution.
Anyway I would never set any channel manually neither on 2,4 or 5 Ghz.
I dont know about you ?
01-29-2015 12:48 AM
Apple have som issues with 802.11.r & k (fastroaming) please remove the options on the SSID.
in the first screenshot under Broadcast, set it to ALL or ARP, this will reduce the traffic on the APs.