Strawman #2: Rank Routes, Pick the Best One


Problem
Incorrect answer!

Two Artifacts of Border Gateway Protocol (BGP)

Impossible to impose a complete ranking of routes at a single router.
Ranking between two routes can depend on presence (or absence) of other routes.
All routes may not be visible at every router.
Set of routes learned at one router depend on route selection at other routers.

Note: These "artifacts" provide flexibility and scalability!