i am trying to understand whether it is possible to have newly provisioned AP's boot up with NO SSID's assigned to them by default.
As i understand it, all APs & the first 16 SSIDs all join the default group.
This is a pain as it means that we will have to have an AP properly physically installed before we are able to join it to a controller. We do not want AP's on our workbenches having live clients associated to them.
No, you cannot change the WLAN ID without deleting & creating it again.
If you are using default settings (ie broadcast SSID, WPA2/AES-802.1x, QoS profile-Silver, WMM-allow, CHd-enable,P2P-disabled) you can simply use following CLI context to do that (assuming WLAN ID 1 to be deleted & recreated as ID 17)
config wlan delete 1
config wlan create 17 ABC ABC
config wlan interface 17
config wlan enable 17
If any other features configured for this WLAN then you need to enable them via GUI or CLI. Below post should help you to understand more CLI commands to do this.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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