BGP
Is next hop reachable?
Ignore iBGP routes that are not synchronized
Highest weight Default: 0 (Local To Router)
Highest Local Preference Default: 100 (Global within AS)
Route originated by local router (next hop 0.0.0.0)
Shortest AS Path
Lowest Origin code (IGP-EGP-incomplete)
Lowest MED
prefer external (eBGP) paths over internal (iBGP)
for IGP routes, prefer path through the closest IGP neighbor
foe EGP routes, prefer oldest (most stable) path
path with the lowset neighbor BGP router ID
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