Had a roaming issues with Symbol MC9090 RF scanners on a Cisco virtual WLC (AIR-CTVM-K9) but weirdly only at one site, even though the same setting were applied across all sites.
The issue was the scanners would drop their SSH connection when moving between APs.
Here’s all my findings:
- Update the scanner firmware, do this, it’s a pain but the newer firmware has so many features that are beneficial.
- Some Scanner firmware would not allow them to connect using the security method WPA2, so enable WPA /TKIP or a better option, update the scanner firmware.
- Secondly change the Scanners to CAM Mode = constant awake mode.
- Thirdly, Cisco TAC recommended using these settings:
Ensure the fast transition is set to adaptive (if you don’t see this then update the code on your WLC):
The Symbol RF scanners support CCKM according to the manual so enable this:
Weird one this one, Cisco told us to disable “Enable Session Timeout” (also disable Aironet IE)