Is there a limitation to the amount of SSIDs allowed on an AP upgraded from an autonomous system to LWAAP? I thought I'd read somewhere that there is a limit of 10 SSIDs but I can't find the documentation.
Unfortunately the support is for SSID 1-8 only. Here are a couple of docs that reference this fact;
APs that are converted to LWAPP mode support eight basic service set identifiers (BSSIDs) per radio and a total of eight WLANs per AP.
When a converted AP associates to a WLC, only the WLANs with IDs 1 through 8 are pushed to the AP.
From this good Q & A doc;
Access Points Converted to LWAPP Support 8 BSSIDs per Radio
Access points converted to LWAPP mode support 8 BSSIDs per radio and a total of 8 wireless LANs per access point. (Cisco 1000 series access points support 16 BSSIDs per radio and 16 wireless LANs per access point.) When a converted access point associates to a controller, only wireless LANs with IDs 1 through 8 are pushed to the access point.
From this AP 1230 doc;
Hope this helps!