Understanding Path-ID: The BGP Path Identifier (Path-ID) is a concept used in BGP to support the advertisement of multiple paths for the same prefix without requiring multiple BGP sessions.
Path-ID Details:
Option A: Incorrect because the Path-ID is not pre-pended to the NLRI (Network Layer Reachability Information) field of a BGP update. It is part of the BGP Multipath feature and used to uniquely identify different paths.
Option B: Correct. Path-ID is an optional transitive attribute that allows for the advertisement of multiple paths.
Option C: Correct. Path-ID uniquely identifies each path advertised to a neighbor.
Option D: Correct. A BGP speaker that re-advertises a route must generate its own Path-ID.
Conclusion: Option A is false because it incorrectly describes the placement of the Path-ID.
References:
Nokia Border Gateway Protocol Fundamentals
RFC 7911 - Advertisement of Multiple Paths in BGP
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