JN0-661 · Question #25
Click the Exhibit button. AS 100 is originating and sending EBGP routes to AS 200. AS 200 is acting as a transit provider and sending those routers to AS 300. AS 200 is using the confederation…
The correct answer is A. 200 100. To avoid routing loops, a sub-AS uses a confederation sequence, which operates like an AS path but uses only the privately assigned sub-AS numbers. The following applies to BGP Confederations…
Question
Click the Exhibit button. AS 100 is originating and sending EBGP routes to AS 200. AS 200 is acting as a transit provider and sending those routers to AS 300. AS 200 is using the confederation topology shown in the exhibit. What will the AS path of AS 100's routes be when they are received on the AS 300 router?
Exhibit
Options
- A200 100
- B200 (65200 65100) 100
- C(65200 65100) 100
- D({65200 65100}) 100
How the community answered
(53 responses)- A70% (37)
- B4% (2)
- C9% (5)
- D17% (9)
Explanation
To avoid routing loops, a sub-AS uses a confederation sequence, which operates like an AS path but uses only the privately assigned sub-AS numbers. The following applies to BGP Confederations https://jncie.files.wordpress.com/2008/09/350010_differences-between-bgp-route-reflectors-and- confederations.pdf
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