Update: WLC Upgrade Issue Affects 11n Data Rates

Update Sep. 20, 2010: Cisco has created new bug ID CSCti89945 for this issue. See my original post on this issue here.

CSCti89945 Bug Details

wlc upgrade to, N breaks requires wlan deletion-readdition.


when a wlc is upgrade from say or later to the wlans do not work with the N rates. a/b/g regular rates work on N capable clients


Issue is seen specifc to N rates when upgrade from lower versions to


Delete the WLAN and recreate or add the WLANs back for N rates to start working on wlc.