Controllerless Networks

I have 1 controller and 100 IAPs. Is there a way to mass convert all to a campus AP?

You could split them 50 / 50  on two different subnets and then you could make the change from the Virtual controller and that should make the change to all the IAPs in that particular subnet .

Thanks. Is that the only option you know of? There are several subnets that will be used.

I'm not sure if it is still the case but there was a limitation on the cluster size to 64 they might have increased it.

That's probably the best way, but maybe somebody may have another idea

Only the IAP-9x series has a limitation on the number of IAPs per group (16).   The 64 IAP per group was an old "suggestion".  

You can have all 100 in the same group (must be in the same vlan) then log into the VC, check to see that all 100 are represented in the UI, go to Maintenance, Convert, point to the IP of the controller, then click convert now.   The controller should push controller based FW to all the IAPs.

Remember, now that they are controller based you will need licensing on the controller.