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[Sidrops] Any credence to AS_SET in the *middle* between AS_SEQUENCEs?

"Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram@nist.gov> Tue, 19 July 2022 21:24 UTC

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From: "Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram@nist.gov>
To: "sidrops@ietf.org" <sidrops@ietf.org>, GROW WG <grow@ietf.org>
CC: "draft-ietf-sidrops-aspa-verification@ietf.org" <draft-ietf-sidrops-aspa-verification@ietf.org>, Jeffrey Haas <jhaas@pfrc.org>
Thread-Topic: Any credence to AS_SET in the *middle* between AS_SEQUENCEs?
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Date: Tue, 19 Jul 2022 21:24:15 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/sidrops/XWLfOXoGbZuo7IAzgMM0Va9DTlY>
Subject: [Sidrops] Any credence to AS_SET in the *middle* between AS_SEQUENCEs?
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Question: Operationally, is an AS_SET ever used in the *middle* between AS_SEQUENCEs? Or, should one simply give zero credence to it?

[Even as I was composing this post, Jeff has already given a helpful answer/suggestion to this in the other thread :) Please see:
https://mailarchive.ietf.org/arch/msg/sidrops/E-SS_hUgxuS5PmjToUC96UEWluU/ ]

Of course, additional thoughts/comments are welcome.

The ASPA verification algorithm gets slightly more complicated if we should bother to accommodate the case of AS_SET in the middle between AS_SEQUENCEs. (Note: AS_SET at the beginning (rightmost and towards the origin) is OK. We include it in our consideration.) 

As I recall, our (NIST) measurements based on Routeviews/RIPE-RIS data in the past did not show any AS_SETs in the middle. 

WG/operator inputs on the above question would help decide to either keep or avoid the above-mentioned additional complication (AS_SET in the middle) in the ASPA algorithm.

Thank you.

Sriram

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