Which protocol is the Cisco SD-Access data plane based on?

The Cisco SD-Access data plane is based on VXLAN. This duplicate item tests the same fabric-plane distinction: LISP handles endpoint-to-location mapping in the control plane, while VXLAN transports encapsulated user traffic in the data plane. Cisco describes SD-Access as using a routed underlay with an overlay in which VXLAN encapsulation carries endpoint traffic between fabric nodes. VXLAN supports the fabric’s virtual network separation and policy transport, allowing the enterprise to move beyond VLAN-only segmentation while keeping the underlay simple and routed. OMP is not part of SD-Access data-plane forwarding; it belongs to Cisco SD-WAN. NHRP is used in DMVPN to resolve next-hop tunnel addresses. LISP is not the answer here because it tells a fabric node where an endpoint is located, while VXLAN is the encapsulation method used to forward the traffic there. Reference topics: Cisco SD-Access architecture, VXLAN, LISP, data plane, control plane, endpoint mobility.