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?
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?
In BGP (Border Gateway Protocol) route selection, the path with the highest local preference is chosen first. In this case, ISP 3 and ISP 4 both have the highest local preference value of 150. When there is a tie in local preference, the next criterion is the shortest AS path. ISP 3 has an AS path length of 4 (64599 65532 65520 65512), and ISP 4 has an AS path length of 2 (65000 65512). Since ISP 4 has a shorter AS path length, it will be selected as the active path.
Local preference default value is 100. The higher the LOCAL_PREF value, the more preferred the route is.
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
C is correct
C is correct