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[Sidrops] IXP Route Server question

"Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram@nist.gov> Tue, 08 March 2022 19:36 UTC

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From: "Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram@nist.gov>
To: "grow@ietf.org" <grow@ietf.org>
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Thread-Topic: IXP Route Server question
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Date: Tue, 8 Mar 2022 19:36:33 +0000
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Subject: [Sidrops] IXP Route Server question
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This question has relevance to the ASPA method for route leak detection.

Is it possible that an ISP AS A peers with a customer AS C via a non-transparent IXP AS B? 
IOW, the AS path in routes propagated by the ISP A for customer C's prefixes looks like this:  A B C.
I.e., can the AS of a non-transparent IXP/RS appear in an AS path in the middle between an ISP and its customer?

Sriram

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