[Sidrops] Multiple publication points in certificate

"Hove, K.W. van (Koen, Student M-CS)" <k.w.vanhove@student.utwente.nl> Wed, 27 July 2022 20:17 UTC

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From: "Hove, K.W. van (Koen, Student M-CS)" <k.w.vanhove@student.utwente.nl>
To: "sidrops@ietf.org" <sidrops@ietf.org>
Thread-Topic: Multiple publication points in certificate
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Date: Wed, 27 Jul 2022 20:17:03 +0000
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Subject: [Sidrops] Multiple publication points in certificate
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Dear all,

Recently I investigated strategies to make ROAs more resilient to outages by publishing them at multiple publication points. During the discussion, I noticed that the SIA AccessDescription extension on certificates, specifically the id-ad-rpkiNotify accessMethod referenced in RFC 8182 section 3.2, does not mention that there can only be one. As far as I can see, there is no restriction in the standard that there must be at most one for each type. In theory multiple RRDP URIs (or rsync URIs for that matter) should be possible. Is this correct, or did I overlook something? And if so, what is the expected behaviour when multiple are defined? 

Cordially,
Koen van Hove