One campus IOS XE router has two BGP paths to the same AWS prefix. Only this router should prefer the first path. Other campus routers must keep their own choices. Which attribute does that?
Select an answer to reveal the explanation.
Short Explanation
You want a private note on this desk, not a memo to the whole campus. You set weight on this router for the first path, and weight is not advertised. Local preference can be passed to other iBGP speakers, and a shorter IKE lifetime does not become a BGP attribute.
Full Explanation
Weight is a Cisco BGP attribute that is local to the router where it is configured. It is considered before local preference, and it is not advertised to any neighbor. Setting a higher weight on the first path makes only this campus router prefer it. Other campus routers keep whatever they already decided. Local preference is passed to iBGP peers in the same autonomous system, so using it can change those other routers, which the requirement forbids. MED advertised toward AWS influences how AWS returns traffic. It does not select only this router's outbound path. The IKE lifetime does not set BGP weight. Exam caveat: weight disappears on reboot unless it is in the saved configuration, and a route map is the usual way to set it so it survives. Operational check: show ip bgp on this router should mark the first path best because of weight, and the same prefix on another campus router should be unchanged.