Re: [Int-dir] Intdir early review of draft-ietf-opsawg-tsvwg-udp-ipfix-03

[[e-mail]]

Hi Joe,

The very short introduction to SAFE/UNSAFE is there to help reader digest the difference between EXP and UEXP introduced right after and understand the rationale for having two IPFIX IEs.

Of course, the authoritative reference for implementers is the TSVWG base spec; the exact section citations are provided.

I still prefer maintaining that text for now.

Thank you.

Cheers,
Med

De : [e-mail] <[e-mail]>
Envoyé : mardi 16 janvier 2024 18:30
À : BOUCADAIR Mohamed INNOV/NET <[e-mail]>
Cc : [e-mail]; [e-mail]; [e-mail]
Objet : Re: [Int-dir] Intdir early review of draft-ietf-opsawg-tsvwg-udp-ipfix-03

I’d actually like to suggest this doc avoid repeating information in other docs, notably the UDP options spec.

In particular:
- there is no need to replicate Fig 1
- there is no need to replicate the definitions of SAFE or UNSAFE

All these things can be “as defined in X”. That avoids any issues if there are subtle changes to these, notably the definitions.

Joe

—
Dr. Joe Touch, temporal epistemologist
www.strayalpha.com<http://www.strayalpha.com/>


On Jan 16, 2024, at 12:28 AM, [e-mail]<mailto:[e-mail]> wrote:

Hi Joe,

Thanks for the follow-up.

Please see inline.

Cheers,
Med

De : [e-mail]<mailto:[e-mail]> <[e-mail]<mailto:[e-mail]>>
Envoyé : lundi 15 janvier 2024 17:17
À : BOUCADAIR Mohamed INNOV/NET <[e-mail]<mailto:[e-mail]>>
Cc : [e-mail]<mailto:[e-mail]>; [e-mail]<mailto:[e-mail]>; [e-mail]<mailto:[e-mail]>
Objet : Re: Intdir early review of draft-ietf-opsawg-tsvwg-udp-ipfix-03

Please see below.

—
Dr. Joe Touch, temporal epistemologist
www.strayalpha.com<http://www.strayalpha.com/>



On Jan 15, 2024, at 12:26 AM, [e-mail]<mailto:[e-mail]> wrote:

Hi Joe,

Thanks for the review.

Please see inline.

Cheers,
Med



-----Message d'origine-----
De : Joseph Touch via Datatracker <[e-mail]<mailto:[e-mail]>>
Envoyé : samedi 13 janvier 2024 05:03
À : [e-mail]<mailto:[e-mail]>
Cc : [e-mail]<mailto:[e-mail]>;
[e-mail]<mailto:[e-mail]>
Objet : Intdir early review of draft-ietf-opsawg-tsvwg-udp-ipfix-
03

Reviewer: Joseph Touch
Review result: Ready with Issues

This review is performed as part of the INTAREA cross-area
review.

There do not appear to be any INTAREA issues in this document.

NOTE: as author of the UDP options on which this document is
based, I have some other concerns noted below, which are the
"issues" indicated in the review result (ready with issues).

There are some misconceptions about UDP options that should be
corrected in this document:

Regarding SAFE options:
-       “Such options can be silently ignored by receivers
without affecting
the meaning of the UDP user data” -       Should be “Such options
can be
silently ignored by legacy receivers because they do not alter
the UDP user data”

Regarding UNSAFE options:
-       “Such options are not safe to ignore”
-       Should be “Such options are not safe tor legacy receivers
to ignore
because they alter the UDP user data”

[Med] Fixed.

It would be useful to use a consistent phrase to describe the "UDP user data" (e.g., as per your Fig 1), i.e., rather than also “UDP data payload”.
[Med] Updated the text to use consistent wording for both safe/unsafe text.



The document should be more clear that UDP options occur per-
packet within a flow and can be introduced at any time in the
flow (unlike TCP).

[Med] Added a new statement to echo this. The export process covers any option that is observed in a flow.




Sec 4.1 needs to indicate use of a field with 256 possible
values; it currently is defined for only 32 or 64 values.



[Med] 32/64 are provided as examples to illustrate the use of reduced encoding. The full 256 range is covered in the spec. Thanks.

“Unsigned” without numeric qualifiers is not an IPFIX data type, per RFC7011 Sec 6.1.1.

Sec 6.2 indicates the specific encoding types where reduced encoding applies, and also uses unsigned only with numeric qualifiers.

[Med] You are right. Updated the text to use a new abstract data type defined in another ongoing opsawg-ipfix spec.

Joe



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