Which process allows continuous IP address retention in a wireless network during roaming?

Layer 3 roaming is the process that allows a wireless client to retain its original IP address when roaming across different Layer 3 client subnets or controller client VLAN contexts. Cisco describes intercontroller Layer 3 roaming as occurring when wireless LAN interfaces are on different IP subnets. During this roam, the controllers exchange mobility messages, but instead of simply moving the client database entry, the original controller marks the client as anAnchor, while the new controller marks the copied client entry asForeign. Cisco explicitly states that the roam remains transparent to the wireless client and that the client maintains its original IP address.