Zebra Omnii XT15 disconection problems with AP3800 at roaming?

[fsotelov1979@gmail.com]

Hi,

here is part of our configuration with what we currently facing disconnection roaming around the warehouse. Any recommendation would be greatly appreciated.

Zebra Omnii XT15 Configuration

SSID test#1
Auth Mode WPA2-Personal (PSK)
Encryption AES
PSK ****************
Network Type b/g
Country U.S
11n – Mode Enable
11n – Block Ack Disable
Power Save Mode Disable
Roaming – RSSI Threshold -70
Roaming AP Discovery Fast
Roaming Packet Loss Aggressive
2.4 GHz Channel Selection 1,6,11


WLC Software Version 8.5.140

Wlan#1
Auth Mode: WPA2-Personal
Only 2.4 GHz radio enable
AP3800 installed 24 units Each one assign to specific channel depending of less congested (1,6, and 11)
Different power levels
QoS Silver
Fastlane Disable
Enable rates 1 – 54 Mbps (Mandatory 1)

config wlan disable 1
config wlan ccx aironetIeSupport disable 1
config wlan wmm disable 1
config wlan security ft disable 1
config wlan enable 1


802.11k Disable
802.11r Disable
802.11v Disable

Client Band Select Disable
Client Load Balancing Disable

Thank you

[Leo Laohoo]

Is Flexible Radio Assignment enabled?

[fsotelov1979@gmail.com]

Hi Leo,
Yes the Flexible Radio Assignment is enabled.

Thank you

[Leo Laohoo]

If FRA is enabled, look at how many 2.4 Ghz are operating.
I've seen a high-density deployment with FRA enabled and 95% of the 2.4 Ghz switched to 5.0 Ghz.
You could be seeing the same thing.

[Haydn Andrews]

have you done a site survey to rule out coverage related?

TAC recommended version is 8.5.151.0 (https://www.cisco.com/c/en/us/support/docs/wireless/wireless-lan-controller-software/200046-tac-recommended-aireos.html)

Issue happening on 2.4 or 5GHz or both?

Seen in warehouses that 2.4 is quite often has large amounts of interference, can you try 5Ghz

[fsotelov1979@gmail.com]

Hi Haydn,
Initially we try to work the 5GHz the disconnection were more often, When we switch with the 2.4Ghz became more stable. However, we have some delay in the XT15.

Thank you

[Mikey Boy]

On the XT15 under the power save option, do you have the choice to set it to CAM?

I have seen in the past where if you disable the setting, the device follows the power options generic to the device. So for example if the screen sleeps after 30 seconds it will sleep the radio as well. 

If you are using an old style "telnet" application with no session persistence it can cause chaos for the end users. Also if the device moves in the building during a screen power save when it powers back up it then does a full re association to the wireless rather than a "roam" 

CAM mode will never allow the radio to shut down unless the battery is dead. Other processes can be asleep on the device but the radio will always be on.

[fsotelov1979@gmail.com]

Hi Mikey,
Yes, we review the setting and everything is in place. For the application we are using wavelink.

Thank you