Figure 2: EVPN VXLAN External Connectivity Through a Border Spine Switch External Connectivity with Layer 3 Networks Layer 3 external connectivity or handoff is established by connecting the border nodes of a BGP EVPN VXLAN fabric with an edge router from the external Layer 3 network. The border node acts as a VTEP to perform VXLAN encapsulation and decapsulation, but it also routes the traffic towards the edge routing device. The VXLAN-facing interface on the external Layer 3 network can be a switch virtual interface (SVI), or a Layer 3 interface, or a Layer 3 subinterface. You can use Layer 3 external connectivity to achieve any of the following:
• Extend the logical isolation between VRFs or VLANs within the EVPN VXLAN network into the externally routed network. The external routed network can be a traditional non-VXLAN campus network, a datacenter, or a WAN. • Provide shared access within the EVPN VXLAN network to a common external service such as the internet. BGP EVPN VXLAN fabric supports Layer 3 external connectivity with VRF-Lite and MPLS Layer 3 VPN networks. Configuring EVPN VXLAN External Connectivity External Connectivity with Layer 3 Networks Configuring EVPN VXLAN External Connectivity 4