A VPC prefix arrives by OMP from the cloud gateway and again from a data center that learned it on the side. Users follow the data-center copy. They should follow the cloud gateway. What should policy prefer?
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Short Explanation
The same prefix is on the board twice, and you have been following the photocopy. You prefer the OMP route that originates at the cloud gateway. A strict loss class does not delete the data-center copy from the overlay.
Full Explanation
Centralized control policy can prefer an OMP route by where it originated. The data center is re-advertising a copy it learned on the side, and that copy is winning. Prefer the route that originates at the cloud gateway so users follow the gateway. Preferring the data-center copy keeps the path they are trying to leave. A strict SLA does not remove an OMP route. It acts on forwarding for a matched application. A guest zone pair does not set the OMP originator. Exam caveat: if the data-center copy is preferred with a higher preference value, your new preference has to beat that value. Matching the originator and then losing on preference changes nothing. Operational check: the installed OMP route should show the cloud gateway as the origin, and the data-center copy should remain only as a backup if you still want it.