Re: [Detnet] WG Last Call: draft-ietf-detnet-bounded-latency-02

Lou Berger <lberger@labn.net> Mon, 22 March 2021 15:56 UTC

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To: Mohammadpour Ehsan <ehsan.mohammadpour@epfl.ch>
Cc: DetNet WG <detnet@ietf.org>, "draft-ietf-detnet-bounded-latency@ietf.org" <draft-ietf-detnet-bounded-latency@ietf.org>
References: <d38af2a0-843f-e117-3368-570f4e26c105@labn.net> <371c2363-4f15-b32f-4c96-483a31ae1c77@labn.net> <8608941F-AD44-4098-83DF-416FBD2DFEA3@epfl.ch>
From: Lou Berger <lberger@labn.net>
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Date: Mon, 22 Mar 2021 11:56:40 -0400
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Archived-At: <https://mailarchive.ietf.org/arch/msg/detnet/vl0jGUyCvap77G6gDVaGNeO1wDM>
Subject: Re: [Detnet] WG Last Call: draft-ietf-detnet-bounded-latency-02
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Ehsan

Thank you for the update.  I did a quick skim and it looks much 
improved.  I found one bit of new language confusing:

    Section 6.4

    In the considered queuing model, we considered the four traffic
    classes (Definition 3.268 of [IEEE8021Q]): control-data traffic
    (CDT), class A, class B, and best effort (BE) in decreasing order of
    priority.  Flows of classes A and B are together referred as AVB
    flows.  This model is a subset of Time-Sensitive Networking as
    described next.

    ....

    Then,
    the input flows are identified using the information in (Section 5.1
    of [RFC8939]).  Then they are aggregated into eight macro flows based
    on their traffic classes.  We refer to each macro flow as a class.

So in the first paragraph, you say "traffic classes" is defined by 
802.1Q.  in the second, you say "their traffic classes" is defined based 
on [RFC8939].  I believe these are inconsistent definitions.  I think 
you are trying to say that

     Then they are aggregated into eight macro flows based on their 
*DetNet flow aggregate.*

This is assuming that the node isn't doing some sort of independent 
mapping of micro-flows to macro-flows.

Please let me know if I'm missing something.

Lou

On 3/22/2021 11:33 AM, Mohammadpour Ehsan wrote:

> Dear WG,
>
> We submitted a new version of the Bounded Latency draft that addresses 
> the comments received in the list 
> (https://datatracker.ietf.org/doc/html/draft-ietf-detnet-bounded-latency-04 
> <https://tools.ietf.org/html/draft-ietf-detnet-bounded-latency-03>); 
> it is now ready for submission to the IESG for publication.
>
> Thanks Lou for his comments. In the new version, we address the 
> comments as follows:
>
>> - Abstract
>> I think the abstract should to be updated to match the current 
>> content of the document. I suggest just copying the 4th and 5th 
>> paragraphs from the Introduction section.
>>
>
> Thanks for the suggestion. The new version is updated accordingly.
>
>> - general comment: classes of (DetNet) Service
>>
>> The document states that it uses terminology from RFC8655, it also 
>> uses the terms "Classes of DetNet Service", " DetNet Classes of 
>> Service"  and other similar forms of these terms.  RFC8655 uses this 
>> term in one place " Class-of-Service schemes (e.g., DiffServ)" and 
>> also mentions "classes of DetNet flows"  in two places.  The data 
>> plane documents [RFC8964] and [RFC8934] also describe Class of 
>> Service in the context of DiffServ (and not DetNet).
>>
>> In reading the document it seems that it is not using CoS in the 
>> typical way used in the IETF  or the other DetNet RFCs, and is 
>> introducing a new definition for CoS.   II think having a document 
>> specific definition of CoS probably isn't helpful. It would be best 
>> to use existing DetNet terminology.  I suspect  "flow aggregate" is 
>> the closest, but perhaps I'm missing something.
>>
>
> Thanks for your comment. In the new version, we used the term 
> “aggregate” instead of class in section 3.1 and classes of DetNet 
> flows. Section 6.4 uses the term “traffic class” as in IEEE802.1Q.
>
>> - alignment with the Data Plane RFCs
>>
>> The lists in section 3.1 and in section 6.4 are not well aligned with 
>> the Data plane documents.  These sections should be aligned with the 
>> provisioning of IP flows, as summarized in Section  6 of RFC8939, and 
>> MPLS as summarized in Section 5 of RFC8964.
>>
> Thanks for your comment. Section 3.1 is about flow admission paradigm 
> and not "flow creation”. The title is changed to “flow admission” to 
> avoid possible confusion. In fact, this section is aligned with the 
> DataPlane RFCs and in parallel with provisioning of IP flows. We 
> modified section 6.4 to follow the Data plane documents.
>
>
>> - minor comment service vs frame preemption
>>
>> Section 3.1 uses the term "un-provisioning", I read the text as 
>> meaning "service preemption".
>>
>> In the rest of the document preemption refers to "frame preemption" 
>> and this should be clarified.
>
> Thanks for the suggestion. In the new version, we use the term 
> “service preemption” and update the term “preemption” to “frame 
> preemption”.
>
>>
>> - id nits, please ensure the document passes idnits without errors, see
>>
>> https://www6.ietf.org/tools/idnits?url=https://www.ietf.org/archive/id/draft-ietf-detnet-bounded-latency-02.txt 
>> <https://www6.ietf.org/tools/idnits?url=https://www.ietf.org/archive/id/draft-ietf-detnet-bounded-latency-02.txt>
>
> Thanks for your comment about idnits. We added the missing sections, 
> i.e., “security considerations” and “IANA considerations” to the 
> draft. Also resolved other comments by idnits.
>
> Best,
> Ehsan
>
>
>
>
> --
> Ehsan Mohammadpour
> PhD Candidate at Swiss Federal Institute of Technology (EPFL)
> EPFL EDIC PhD student representative
> IC IINFCOM, LCA2, INF 011, Station 14, 1015 Lausanne, Switzerland
> https://people.epfl.ch/ehsan.mohammadpour 
> <https://people.epfl.ch/ehsan.mohammadpour?lang=en>
>
>
>> On 21 Feb 2021, at 23:15, Lou Berger <lberger@labn.net 
>> <mailto:lberger@labn.net>> wrote:
>>
>> All,
>>
>> The WG last call is complete.
>>
>> Authors,
>>
>> Please bring any resolutions to comments received to the list. Once 
>> all comments are addressed please update the draft and let the WG 
>> know that it is ready for submission to the IESG for publications.
>>
>> Thank you!
>>
>> Lou
>>
>> On 2/5/2021 8:30 AM, Lou Berger wrote:
>>> All,
>>>
>>> This starts working group last call on 
>>> draft-ietf-detnet-bounded-latency-02
>>> https://datatracker.ietf.org/doc/draft-ietf-detnet-bounded-latency/ 
>>> <https://datatracker.ietf.org/doc/draft-ietf-detnet-bounded-latency/>
>>>
>>> The working group last call ends on February 19th.
>>> Please send your comments to the working group mailing list.
>>>
>>> Please note, there was an IPR disclosure against this document
>>> submitted on January 14, 2021, see 
>>> https://datatracker.ietf.org/ipr/4581/
>>> While this disclosure came very late in the document life cycle,
>>> it appears the filing was also relatively recent (2019-10-16) and
>>> after the pre adoption IP call:
>>> https://mailarchive.ietf.org/arch/msg/detnet/1mwYdadDzTLudcuH5T5O7R_KlDs
>>>
>>> Positive comments, e.g., "I've reviewed this document
>>> and believe it is ready for publication", are welcome!
>>> This is useful and important, even from authors.
>>>
>>> Thank you,
>>> Lou (DetNet Co-Chair & doc Shepherd)
>>>
>>>
>>>
>>> _______________________________________________
>>> detnet mailing list
>>> detnet@ietf.org
>>> https://www.ietf.org/mailman/listinfo/detnet
>