Fabric Lab

One Linux box, a pile of QEMU VMs, and a bridge per cable. Sizing the host, the overcommit that makes it affordable, image conventions, and driving it all from the API.

A build series: from an empty hypervisor to a real app on a routed VXLAN/EVPN fabric with Kubernetes and Cilium BGP, every config shown. Part 1 is the map: the whole architecture, the addressing plan, and why BGP runs at literally every layer.