Which control plane protocol is responsible for ElD-to-RLOC mapping concerning SO-Access Architecture?

LISP is the control-plane protocol responsible for Endpoint Identifier to Routing Locator mapping in Cisco SD-Access. In the SD-Access architecture, an endpoint address is treated as an EID, and the fabric node location is represented by an RLOC. The fabric control-plane node performs LISP map-server and map-resolver functions so edge nodes can register local endpoints and resolve the current location of remote endpoints. This separation allows the overlay to support host mobility, anycast gateway behavior, and segmentation without depending only on traditional subnet-bound forwarding. VXLAN is the fabric data-plane encapsulation used to carry traffic across the fabric and preserve policy information, but it does not provide the EID-to-RLOC mapping function. CEF is the local forwarding mechanism inside Cisco devices, and GBAC is not the SD-Access mapping protocol. Therefore, LISP is the correct answer because it provides the SD-Access fabric control plane. Reference topics: Cisco SD-Access control plane, LISP, EID, RLOC, map-server, map-resolver.