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?

The correct answer is C. ISP 4. In BGP, the path selection process is based on a set of attributes. The process starts by preferring the path with the highest weight, then the highest local preference, then the locally originated routes, and so on. If all these attributes are the same, then it prefers the…

BGP

Question

Exhibit

Options

AISP 1
BISP 3
CISP 4
DISP 2

How the community answered

(41 responses)

A
15% (6)
B
10% (4)
C
73% (30)
D
2% (1)

Explanation

In BGP, the path selection process is based on a set of attributes. The process starts by preferring the path with the highest weight, then the highest local preference, then the locally originated routes, and so on. If all these attributes are the same, then it prefers the path with the shortest AS path. Referring to the exhibit, all four ISPs have the same weight, local preference, and origin. However, ISP 4 has the shortest AS path. Therefore, ISP 4 will be selected as the active path. So, option C is correct.

Topics

#BGP path selection#best path algorithm#BGP attributes#multipath ISP

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