On a municipal hospital campus, engineers set Cisco Weight on one border router to prefer an ISP. Why does that choice fail to steer the rest of the ASN the same way?
Select an answer to reveal the explanation.
Short Explanation
Weight is a sticky note glued to one router’s monitor—nobody else in the hospital ASN can see it. If you need the whole campus to prefer an ISP, use LOCAL_PREF, which actually travels over iBGP.
Full Explanation
Cisco Weight is the first BGP best-path criterion but exists only in local router configuration; it is never sent to peers. Therefore a Weight preference on one border does not influence other routers’ path selection. LOCAL_PREF is the AS-wide attribute for consistent outbound preference. Weight remains useful for per-router exceptions, not campus-wide policy.