Interconnect EVPN-VXLAN in a data center to an EVPN-VXLAN control plane in a WAN using a gateway model

We support Data Center Interconnect (DCI) stitching for EVPN-VXLAN gateway tunnels. The gateway connects the data center and the WAN, and both data center and WAN gain forwarding states for route distinguishing, route targeting, and interconnect Ethernet segment identifier (I-ESI) support. 

DCI control plane stitching also supports multihoming, extends the Layer 2 connectivity required for some tenants in a data center, and uses the unknown MAC route to prevent MAC scale issues on data center network virtualization edge (NVE) devices.