External connectivity from data centers is a prime requirement. VXLAN EVPN based data center fabrics, like your Greenfield and Brownfield, are providing east-west connectivity by distributing IP-MAC reachability information. In your Greenfield fabric, the border leaf switch, Site1-BL1, is in place to provide external Layer 3 connectivity using VRF Lite or simply put, connecting out of the fabric. These steps show you how to create the External Fabric required by Nexus Dashboard to extend a VRF to an external fabric device.
Nexus Dashboard can create External Fabrics and manage the external devices if they are Nexus Devices or ASR9000 series or NCS5500 series routers. Nexus Dashboard will not only generate and push the configuration required for the leaf switch(es) acting in the Border Leaf role, but also these platforms maintaining configuration compliance.
At this point you should be back to the Fabrics main page. You should now see Site1 and present.
In the Settings page:
Once the External Fabric has been built, the GUI will take you to the All Done!
Continue to the next section to discover and import your external device into your ExtL3 fabric.