EVPNVXLAN

EVPNVXLAN, often termed EVPN-VXLAN, refers to an architecture that combines Ethernet VPN (EVPN) with VXLAN encapsulation to extend Layer 2 and Layer 3 networks over an IP underlay. In this model, VXLAN provides the data plane encapsulation, wrapping Ethernet frames in UDP/VXLAN headers and using a VXLAN Network Identifier (VNI) to distinguish tenant segments. EVPN provides the control plane, typically using MP-BGP to advertise MAC and IP reachability, as well as route targets, between VTEPs.

VTEPs are typically edge switches or routers that terminate VXLAN tunnels and perform MAC learning. The underlay is a routed IP fabric that offers IP connectivity between VTEPs. EVPN uses BGP to distribute MAC/IP information, enabling devices to learn reachability without flooding and providing scalable control of broadcast and unknown unicast traffic.

EVPN supports multipoint services such as active-active multihoming, MAC mobility, and efficient handling of unknown unicast frames. It enables Layer 2 VPNs with VXLAN overlays and can extend Layer 2 domains across data centers while allowing Layer 3 routing between sites. This flexibility supports scalable, multi-tenant networks and seamless workload mobility across locations.

Key advantages include improved scalability for large multi-tenant deployments, reduced broadcast and unknown-unicast flooding, and more predictable traffic engineering through EVPN routes. Tenants are logically isolated using mechanisms such as route distinguishers and route targets, enabling clean separation in shared data centers.

Common deployment patterns include data center interconnect, campus fabrics, and cloud-provider networks seeking flexible Layer 2 and Layer 3 extensions and smoother migrations from traditional VLAN/STP-based architectures.