Re: [RTG-DIR] [Detnet] Rtgdir last call review of draft-ietf-detnet-mpls-04

Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> Mon, 27 January 2020 19:42 UTC

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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, Lou Berger <lberger@labn.net>
CC: Routing Directorate <rtg-dir@ietf.org>, =?gb2312?B?QmFsqKJ6cyBWYXJnYSBB?= <balazs.a.varga=40ericsson.com@dmarc.ietf.org>, "detnet@ietf.org" <detnet@ietf.org>, "draft-ietf-detnet-mpls.all@ietf.org" <draft-ietf-detnet-mpls.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>
Thread-Topic: [Detnet] Rtgdir last call review of draft-ietf-detnet-mpls-04
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Date: Mon, 27 Jan 2020 16:19:34 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rtg-dir/agxHnKYj46foqDqxqlUwzxVALKA>
Subject: Re: [RTG-DIR] [Detnet] Rtgdir last call review of draft-ietf-detnet-mpls-04
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Hi all,
I fully agree with Carlos about a "one-liner explanation" that would not hurt.
IMHO and FWIW it would be even better if the such an explanation would also cover:
- the rationale for three MUST to support sequence number spaces
- added value of the sequence number space with zero bits in DetNet (one of these three).

My 2c.

Get Outlook for Android<https://aka.ms/ghei36>

________________________________
From: rtg-dir <rtg-dir-bounces@ietf.org> on behalf of Carlos Pignataro (cpignata) <cpignata@cisco.com>
Sent: Monday, January 27, 2020, 17:08
To: Lou Berger
Cc: Routing Directorate; Bal¨¢zs Varga A; detnet@ietf.org; draft-ietf-detnet-mpls.all@ietf.org; last-call@ietf.org
Subject: Re: [RTG-DIR] [Detnet] Rtgdir last call review of draft-ietf-detnet-mpls-04

Hi, Lou,

> 2020/01/27 ÎçÇ°9:41¡¢Lou Berger <lberger@labn.net>¤Î¥á©`¥ë¥á©`¥ë:
>
> Hi,
>
> Bal¨¢zs thank you for the clarification -- see below for one comment.
>
> On 1/10/2020 8:56 AM, Bal¨¢zs Varga A wrote:
>> Yes, but why not the Preferred CW?
>>
>> <Balazs>/<Stewart> Sum of mailing + proposed fixing:
>> The PCW only supports a 16bit sequence number and it has the skip zero auto-signaling of active S/N feature.
>> This was a problem for DetNet because:
>> - We were worried about S/N rollover frequency in some applications and so we wanted the option of a larger S/N.
>> - We wanted to have the option to propagate the S/N from the payload to the transport to simplify the implementation
>> in some cases. These applications have a non-skip zero S/N. Skip zero is an irritation to implement and we should probably
>> have signaled in in PWs.
>> As you note in is only a preferred design for PWs, DetNet is not constrained by that and there were good reasons to adopt
>> this alternate approach.
>> We assume to fix this with adding above information to the text.
>> NEW text to be added in section 4.2.1:
>>     "This format of the d-CW was created in order (1) to allow larger S/N space to
>>     avoid S/N rollover frequency in some applications and (2) to allow non-skip
>>     zero S/N what simplifies implementation."
>
> While I completely agree with the rational and validity of the good question, I don't think such motivation belongs in the document.  We generally don't document every design decision in a specification.  I don't feel strongly about this so if others do, I'll defer to their opinion...
>
> Bal¨¢zs, Carlos, Do you think it should stay?
>

I have no strong feelings either way, but I believe if this is a departure from a ¡°preferred¡± format from a BCP, then a one-liner explanation would not hurt. I¡¯d leave this one in.

Thanks,

Carlos.

> Thanks,
>
> Lou (as contributor)
>



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