EVPN-VXLAN: IPv4 IRB (IPv4 L3GW)

This feature introduces basic support for integrated routing and bridging (IRB) with IPv4 addressing (IPv4 Layer 3 gateway) in EVPN-VXLAN. An EVPN-based IRB solution provides optimum unicast and multicast forwarding for both intra-subnets and inter-subnets within and across data centers. The EVPN IRB feature is useful for service providers operating in an IP/MPLS network that provides both Layer 2 VPN or VPLS services and Layer 3 VPN services who want to extend their service to provide cloud computation and storage services to their existing customers.