AR271

[pc_evans]

The Router-ID is the tie breaker in the AS Path Selection. Path 6 wins because of its lowest Router-ID. Path 5 (RID 10.77.255.57) comes in second.

1. Weight - not a factor... no option mentions weight
2. Local Preference - Same value (100) on all paths
3. Origin Code - Same value (learned) on all paths.
4. Path Length - Same on all devices (1) an AS_Set counts as one
5. Origin ID - Same on all Devices (IGP)
6. MED - Same on all devices (0)
7. Prefer eBGP over iBGP - all paths are internal There is no distinction between Conferderation External and Confederation Internal.
8. IGP Metric - Same value (20645) on all paths.
9. Multipath - not used
10. if both paths are external, choose oldest path. not used
11. Lowest Router-ID Path 6 wins,  Path 5 is second.

Changing the Local_Pref could have the desired effect but the wording is incorrect.  Lowering the LOCAL_PREF does not select AS THE BEST PATH, you would need to raise the LOCAL_PREF for this to happen.  

Prepending the AS_PATH for the current best path would move path 6 from first to worst.  Path 5 would become the new best path. 

https://www.cisco.com/c/en/us/support/do...753-25.pdf