Customers can work with AWS Direct Connect Delivery Partners to extend the AWS DX connection at Layer2 in which case BGP session would be from AWS router and customer on-premises router Or Layer3 (Network layer) from the DX location to the customer location. In this case the the AWS Direct Connect Partner provides a router within the DX location that will form a BGP session with the AWS equipment. The DX partner then establishes another BGP with the customer, e.g. over an MPLS.
If the customer is located in a data center or colo facility that is not a DX location, it is best to check with that data center or colo facility for a list of preferred AWS Direct Connect Delivery Partners that can provide DX connectivity into this particular data center or colo facility.
Hope this helps
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