When importing a Brownfield fabric, the same concept and rules apply for the switch roles. Nexus 9300 switches will default to the leaf role while Nexus 9500 switches will default to the spine role. There is no border leaf switch in this fabric, but there is a border gateway leaf switch that needs its role set appropriatly.
Set the role of the border gateway leaf, Site2-BGW1, correctly:
Review the switch roles that were automatically assigned by NDFC and the role you set. Again, each switch role will serve a purpose in the type and amount of exact configuration required to be deployed to a given switch.
Continue to the next section for the initial Recalculate and Deploy from NDFC to your Brownfield Site2 fabric.