Which role does the router ID (RID) have in the BGP route selection process?
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A. B. C. D.C
In BGP, the Router ID (RID) is a unique identifier assigned to each BGP router. The RID is used as a tie-breaker when multiple routes have the same attributes, such as the same Autonomous System Path (AS_PATH) length, origin code, and MED.
The BGP route selection process follows a predefined set of rules to select the best path from among the multiple available paths. These rules are known as the BGP path selection algorithm. The BGP path selection algorithm evaluates various attributes of each path and selects the best path based on a predetermined order of priority.
The RID is evaluated in the last step of the BGP path selection algorithm, after all other path attributes have been considered. Specifically, the RID is used to break a tie between two or more paths that have the same attributes, including the same local preference, AS_PATH length, origin code, and MED.
Therefore, answer B, "The router ID is evaluated last in the route selection process" is the correct answer. The RID is not evaluated immediately after MED (answer A), after the cluster length (answer C), or after analyzing the IGP metric cost (answer D) in the BGP route selection process.