An engineer is preparing an implementation plan in which the configuration needs to
influence BGP’s choice of best patH. Which of the following is least likely to be used by the
configuration in this implementation plan?
A.
Weight
B.
Origin code
C.
AS_Path
D.
Local_Pref
Explanation:
Weight and Local_Pref were created for the purpose of giving engineers tools to influence
the BGP best path choicE. AS_Path was created for loop avoidance, but AS_Path length
can also be manipulated (for instance, with AS_Path prepend) to influence the best path
choicE. Although the Origin PA can be changed by configuration for the purpose of
influencing the best path decision, the intent of this PA is to identify the source from which
the route was introduced into BGP. Additionally, the best path algorithm considers the Origin
PA after the other PAs listed in the answers, making Origin the least useful of these answers
for influencing path choicE.