Multi-regional deployment

This design can be extended to multiple regions by configuring Hub-to-Hub EBGP sessions per overlay. However, due to the complexity and route duplication caused by readvertisement of multiple BGP NHs with BGP ADD-PATH, we have decided not to describe this option in detail in this document.

For a multi-regional deployment, we recommend considering the newer BGP on loopback design. Please also see Choosing the routing design for more details.