Locally stored controller IPv4 or IPv6 address discovery-If the access point was previously associated to a controller, the IPv4 or IPv6 addresses of the primary, secondary, and tertiary controllers are stored in the access point's nonvolatile memory. This process of storing controller IPv4 or IPv6 addresses on an access point for later deployment is called priming the access point. https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-6/config- guide/b_cg86/ap_connectivity_to_cisco_wlc.html