- Scaleway uses VXLAN with BGP EVPN to build an overlay fabric on their network infrastructure. This provides multi-tenancy, encapsulation of Ethernet frames over UDP, and support for both bridging and routing. - The underlay fabric uses Clos topology with IPv4 and eBGP for high bandwidth and resilience. Edge devices run as VTEPs to connect virtual networks over the overlay. - A virtual route reflector provides the control plane for the overlay fabric, decoupling it from the underlying hardware. This allows routing between subnets and multi-homing of hosts between VTEPs.