L3 routers can be configured in centralized mode or distributed mode.
In centralized mode, routing is configured only on the border leaf pairs. In contrast, for distributed mode, routing is configured on the corresponding leaf nodes where the endpoints reside.
openstack router create R1 --distributed openstack router create R2 --centralized
openstack router create R2
The L3 service plugin passes this information to EFA. Then, the EFA Tenant Service configures VRF or routing on border leafs or on leaf nodes, based on the configuration mode.