What is the easiest way to enable SD-Access for all your remote sites after you have your campus SD-Access fabric up and running?

Extending the campus SD-Access fabric as a single logical domain over the existing traditional physical network (such as a routed WAN or MPLS) minimizes new infrastructure deployment and configuration overhead, making it the simplest integration path. This approach allows the LISP control plane and VXLAN data plane of the fabric to span across the existing WAN infrastructure, simplifying overall management.

Managing separate fabric domains for each remote site increases administrative complexity and operational overhead compared to a single unified fabric domain.

Deploying a separate SD-WAN solution as an underlay for each remote site's separate fabric domain introduces significant additional complexity and management burden, making it far from the easiest approach.

While a single fabric domain simplifies management, introducing a new SD-WAN solution specifically to act as the underlay for the SD-Access fabric adds a new layer of technology and deployment effort that may not be simpler than leveraging an existing traditional physical underlay.