ACI supports three routing protocols: BGP, OSPF, and EIGRP. We will start by looking at BGP.
As we go forward, we will see that the steps taken to implement OSPF and EIGRP are very similar. The steps, from a 10,000-foot view, are to create an "external routed network," configure an interface, and associate this interface to a bridge domain. To get a visualization of the type of deployment we would be looking at, refer to this figure: