The Cisco SD-Access control plane characteristic is that it stores remote routes in a centralized database server. This is achieved through the use of the Locator/ID Separation Protocol (LISP), which allows the control plane to map between endpoints and their locations within the network. LISP acts as the control plane for Cisco's Software-Defined Access (SD-Access), resolving endpoint-to-VTEP mappings and enabling scalable host mobility across the network. References: Cisco SD-Access Architecture : Control, Data & Policy Plane