To interconnect two Cisco SD-Access Fabric sites, two methods can be utilized: SD-Access transit and IP-based transit. SD-Access transit leverages a native Cisco SD-Access fabric for domain-wide communication, while IP-based transit uses traditional IP-based networks like VRF-LITE or MPLS, requiring remapping of VRFs and SGTs between sites3. References := Cisco Live - Cisco SD-Access Connecting Multiple Sites in a Single Fabric Domain