In the case of Layer 3, all VRFs in the data center are terminated
on the border leaf and traffic is routed towards the WAN, as shown in the following
figure. Similarly, Layer 3 traffic received from the WAN is routed and forwarded
over tunnels in the data center. Because Layer 3 routes across multiple VRFs can be
imported into a single (interconnecting) VRF, all possible VRFs in a given data
center do not have to be configured on the border leaf.
