This pneumonic will help you memorize how BGP selects best route.
"We Love Oranges AS Oranges Mean Pure Refreshment!"
We === Weight (Highest)
Love === LOCAL_PREF (Highest)
Oranges === Originate (local)
AS === AS_PATH (shortest)
Oranges === ORIGIN Code (IGP > EGP > Incomplete)
Mean === MED (lowest)
Pure === Paths (External > Internal)
Refreshments === RID (lowest)
Routing policy is based on the following attributes:
Prefer the highest weight attribute (local to router)
Prefer the highest local preference attribute (global with AS)
Prefer route originated by the local router (next hop = 0.0.0.0)
Prefer the shortest AS path (least number of autonomous systems in AS-path attribute)
Prefer the lowest origin attribute (IGP < EGP < incomplete)
Prefer the lowest MED attribute (exchanged between autonomous systems)
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