of this writing the zone of advantage for most use cases is able to support 10 Gbps user network interface (UNI) speeds with multiple 10 Gbps customers being served on a single server. This is an important milestone because, as of this writing, more than 95% of AT&T end customers attach to the network with UNI's less than 10 GE and hence more than 95% of AT&T packet service custom- ers can be served with software-based routers over time as their deployment expands. With new servers and continuously improved and optimized software 100 Gbps port speeds are now being attained in test bed configurations and will move into production over the coming year. Currently, enterprise Internet and VPN services utilize this new vPE technology, while resi- dential BNG service and metro switch Ethernet services are being certified for production vPE operation. The implications of being able to serve the vast majority of AT&T customers with software rout- ers are many. The shift from vertically integrated routers to a new disaggregated router architecture finally manifests the vision of making packet edges multiservice fungible without compromises. In addition, new value added on-demand services are now made possible. With on-demand services truck rolls and long turn up cycles are replaced with software service chain of VNFs in conjunction with the vPE to provide greater service velocity than was ever possible before. With the new capabilities provided by vPE VNFs it became necessary to rethink the architecture for interconnecting vPE and traditional PNF PEs using modern fabric technologies. Ethernet VPN (EVPN) is emerging as a unifying construct within cloud networking (Sajassi et al. 2016). 12.5 EVPN: FLEXIBLE ACCESS GROOMING AND UNIVERSAL CLOUD OVERLAY The cloud architecture for hosting edge services in VNFs provides flexibility in the placement of VNFs (see Chapter 3) within a data center or among a set of data centers. The VM software orchestration and VNF hardware independence allow the VNFs to be moved as needed for capac-