Implementation of Border Nodes for EVPN VXLAN External Connectivity Border nodes or border VTEPs are the devices through which you establish a connection between an EVPN VXLAN network and an external network. The border nodes sit on the periphery of the EVPN VXLAN network and remain a part of the BGP EVPN VXLAN fabric. To enable external connectivity, you can implement the border nodes of an EVPN VXLAN network as either border leaf or border spine switches. Connectivity Through a Border Leaf Switch Leaf switches deployed as border nodes support the required control plane and data plane functionalities.
Border leaf deployment ensures that the configuration on the spine switches is much simpler. Border leaf switches only allow communication between the external network and the VXLAN network, also known as north-south communication. A border leaf switch can also be multiple switches functioning as a single logical system with Cisco StackWise Virtual configured. Note The following figure shows border leaf external connectivity of an EVPN VXLAN network with external Layer 2 and Layer 3 networks: Configuring EVPN VXLAN External Connectivity Implementation of Border Nodes for EVPN VXLAN External Connectivity Configuring EVPN VXLAN External Connectivity 2