Pre-requisites for Deploying Mobility Express Solution
You must not have other Cisco Wireless LAN Controllers; neither appliance nor virtual in the same network during set up or during daily operation of a Cisco Mobility Express network. The Mobility Express controller cannot interoperate or co-exist with other Wireless LAN Controllers in the same network.
Decide on the first Access Point to be configured as a Primary Access Point. This Access Point should be capable of supporting the Wireless LAN Controller function.
DHCP Server: A DHCP server must be configured so that Access Points and clients can obtain an IP Address and gateway assigned is reachable at all times.