Abstract: There is provided a system that comprises an IP-routed interregional distribution network, and a user-network interface (UNI) that employs (a) a first virtual broadcast domain (VBD), (b) a second VBD, (c) a virtual extensible local area network (VXLAN), and (d) a protocol transformation stack. The UNI is adapted for layer 2 connection to a user device via the first VBD, and adapted for layer 3 communication over the IP-routed interregional distribution network via the VXLAN. The protocol transformation stack is adapted to convert a layer 2 broadcast domain to/from an IP-routable form by mapping the first VBD to the second VBD, and encapsulating the second VBD into the VXLAN.