10-17-2018 04:40 PM - edited 07-05-2021 09:19 AM
I have inherited a 5 year old WLAN deployment where clients have never successfully roamed. There is a 10 - 20 second delay when moving between AP. During this break the wifi icon disappears from devices and connectivity is lost. We have a mix of iOS, Android, SurfacePro and the odd laptop on the network and all encounter the same issue. I do not see any disassociation events in the debug when this happens.
Where do I troubleshoot from here to track down the root cause? have attached a debug log
5508 (8.2.151.0) controller and mix of 3502 & 3602 AP. Dual 2.4/5Ghz
10-19-2018 06:46 AM
10-19-2018 07:12 AM - edited 10-19-2018 07:13 AM
Thanks. Seems to be kind of normal then I guess as there a multiple threads out there discussing this. Its not an issue that causes problems in real life however since data rates are high enough for most workloads in our environment these days.
btw - just updated the driver of a Intel wireless NIC from mid 2017 to mid 2018 and data rates nearly doubled on that client. It is unbelivable that the driver on the client device always have that much impact.
10-19-2018 07:24 AM
10-19-2018 06:00 AM
The Corp SSID is 5Ghz only. Guest was previously 2.4 only. The drop happened roaming on both these as well as the dual. Happens to all devices on all sites which led me to think it maybe a config problem
10-19-2018 06:44 AM
10-19-2018 07:31 PM
10-19-2018 02:16 PM
No, still no change for our problem. We have mixed device network not just laptops like the other person asking questions in this thread
10-21-2018 12:47 PM
Upgraded to 8.2.170.0.
Still seeing the 30-60 second connection loss when roaming
10-21-2018 11:43 PM
10-22-2018 12:42 AM
3 SSID. Corp/Employee BYOD both WPA2 Enterprise and a guest with portal.
These are across multiple sites, most with multiple floors. Single WLC. Issue is constant across all out sites with all devices. .
5Ghz seems is good signal, noise and coverage wise, 2.4 has lots of snr/channel overlap due to density used for 5ghz, Going to disable a few of the 2.4 radios to try and help that. Mixed devices seem to steer to 5ghz without problem so 2.4 isnt highly utilized but it usable. Everything works fine unless they roam (on either 2.4 or 5).
Another thing I have noticed is EDRRM seems to change up channels on 2.4 often and power on 2.4/5 more often. Power ranges go from 1 to 7 and I have seen it put Channel 1 on 3 adjacent AP's before which doesn't help things.
When roaming the client device stops, signal icon disappears like signal has gone. WLCdoesnt log anything then 30+ sec then burst in to life and reassociates client on the new AP. Not seeing any authentication errors in WLC or RADIUS server.
10-22-2018 01:24 AM
10-22-2018 01:52 AM
you have roaming issues in building A, floor A (this is an example)? Yes (happens on any floor, any building, any site)
The client has just 1 company SSID configured? Yes. Multiple SSID available but testing device has only 1 configured
Everywhere where the client walks (and has the roaming issue) he never drops below -75 dbi signal strength? Unknown. On the device signal appears to dissapear (iphone and android signal icon disappear). Reconnects 30+ sec later. - couldnt see a way to see signalstrength on either device
How is the SSID configured in regards to security, what is enabled on Layer 2? WPA2 enterprise. AD (RADIUS) & Cert
All the APs in building A floor A are on the same WLC? Yes
10-22-2018 02:13 AM
10-22-2018 07:26 AM
10-22-2018 08:03 AM
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