BGP Best Path Selection Algorithm

Check if the next-hop is reachable. If yes, then proceed
The path which has the highest WEIGHT
The path which has the highest LOCAL_PREF
The path which has been locally originated via a “network” or “aggregate” BGP command or through redistribution from an IGP
The path which has the shortest AS_PATH
The path which has the lowest origin type
The path which has the lowest MED
EBGP is preferred over IBGP
Prefer the path which has lowest IGP metric to the BGP next hop
Determine if multiple paths require installation in the routing table for “BGP multipath”
In case both the paths are external, prefer the path which was received first (the oldest one)
Prefer the route which comes from the BGP router with the lowest router ID
If the originator or router ID is the same for multiple paths, prefer the path which has minimum cluster list length. (This is only present in BGP RR environments. It allows clients to peer with RRs or clients in other clusters. In this scenario, the client must be aware of the RR-specific BGP attribute.)
Prefer the path which comes from the lowest neighbor address.

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