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[Detnet] AD Review of draft-ietf-detnet-mpls-over-ip-preof-07

Roman Danyliw <rdd@cert.org> Fri, 27 October 2023 21:05 UTC

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From: Roman Danyliw <rdd@cert.org>
To: "detnet@ietf.org" <detnet@ietf.org>
Thread-Topic: AD Review of draft-ietf-detnet-mpls-over-ip-preof-07
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Archived-At: <https://mailarchive.ietf.org/arch/msg/detnet/uOfa3pPOQmUqk1LGktfSxqdDwe4>
Subject: [Detnet] AD Review of draft-ietf-detnet-mpls-over-ip-preof-07
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Hi!

I performed an AD review of draft-ietf-detnet-mpls-over-ip-preof-07 stepping in as the responsible AD to help load-balance the PubReq queue.  Thanks for the document.

Begging your patience not being a RTG AD, I have difficulty understanding the basic encapsulation semantics being proposed.  I tried following the references, but wasn’t able to understand how to construct the basic encapsulation.  See below:

** Section 4.2.  Figure 3 is describing an encapsulation header built on fields and processes based on [RFC8964] and [RFC9025].  The UDP payload appears to be an S-Label + dCW + Detnet payload.  Section 4.2.1 of RFC8964 describes the d-CW format and semantics. Section 4.2.2 of RFC8964 has significant text describing S-Labels, but where is the very basic description: how many bits is it?  What are the semantics?

** Section 4.4. 
-- No objection to this text.  However, this behavior seems like an expansion of the PREOF scope I understand the document be.  Is there narrative text that can bridge how aggregation is a building block for replication, elimination and ordering?  I could perhaps speculate on replication and elimination. Less so on ordering.

-- I’m missing a basic understanding of layering.  How do I know the header in UDP is “S-Label + dCW” vs. “A-Label + dCW + S-Label + dCW”?

** Section 5.
   The minimum set of information for the configuration of the DetNet
   service sub-layer is summarized as follows:

   *  App-flow identification information.

How do I specify that?

...
   *  PREOF + related Service-ID(s).

Does that mean to have PREOF “information” for configuration?  Does that mean choosing the algorithms?

** Section 6.
   There are no new DetNet related security considerations introduced by
   this solution.

Please cite by reference which security considerations apply.

** Idnits reports:

  == Unused Reference: 'RFC2119' is defined on line 427, but no explicit
     reference was found in the text

  == Unused Reference: 'RFC8174' is defined on line 432, but no explicit
     reference was found in the text

Regards,
Roman

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