Will anything happen to the devices already connected on the existing VLAN or will new users connecting start taking addresses from the new VLAN and old devices keep running like nothing has changed?
Nothing will happen to the old devices. They will run as usual.
However this depends on the way you add vlan.
Let me explain,
If you add it as follows
Wlan virtual-ap <your vap profile>
Vlan <new vlan>
This will replace your existing vlan and all the users will get disconnected.
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The following method is how it should be done.
Wlan virtual-ap <your vap profile>
Vlan <old vlan> , <new vlan>
The comma is VERY important.
The size of the new vlan does not matter. It can be larger than the old one.
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