You are receiving the BGP route shown in the exhibit from four different upstream ISPs. Referring to the exhibit, which ISP will be selected as the active path?
Why Other Options Are Incorrect:
A. ISP 1: Eliminated due to lower Local Preference (100).
C. ISP 4: Has a shorter AS-Path but loses to ISP 3 due to tiebreaker (or missing info in exhibit).
D. ISP 2: Eliminated due to lower Local Preference (100).
ISP 3 wins because:
Highest Local Preference (150).
Tiebreaker (if any) likely favored ISP 3 (e.g., lower router ID).
Local Preference is the strongest BGP attribute for outbound traffic control.
Always check:
Local Pref → AS-Path → Origin → MED → Other tiebreakers.
It the next-hop can be resolved, BGP Path Selection check Local Preference Value: so we can ignore answer A and B. Next, Shortest AS Path is preferred - answer C - ISP4
Local preference default value is 100. The higher the LOCAL_PREF value, the more preferred the route is.
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