Re: [ippm] [sfc] WGLC for https://datatracker.ietf.org/doc/draft-ietf-sfc-ioam-nsh/

mohamed.boucadair@orange.com Thu, 14 April 2022 12:38 UTC

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From: <mohamed.boucadair@orange.com>
To: "Frank Brockners (fbrockne)" <fbrockne@cisco.com>, Shwetha Bhandari <shwetha.bhandari@thoughtspot.com>, Greg Mirsky <gregimirsky@gmail.com>
CC: "Frank Brockners (fbrockne)" <fbrockne=40cisco.com@dmarc.ietf.org>, "sfc-chairs@ietf.org" <sfc-chairs@ietf.org>, "sfc@ietf.org" <sfc@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>, James Guichard <james.n.guichard@futurewei.com>, Tal Mizrahi <tal.mizrahi.phd@gmail.com>, "draft-ietf-sfc-ioam-nsh@ietf.org" <draft-ietf-sfc-ioam-nsh@ietf.org>
Thread-Topic: [sfc] WGLC for https://datatracker.ietf.org/doc/draft-ietf-sfc-ioam-nsh/
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Date: Thu, 14 Apr 2022 12:38:38 +0000
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Subject: Re: [ippm] [sfc] WGLC for https://datatracker.ietf.org/doc/draft-ietf-sfc-ioam-nsh/
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Re-,

draft-ietf-sfc-ioam-nsh includes OAM data (likely with user data) but there is an ambiguity in 8300 to whether this is considered as an OAM packet. Please refer to the SFC archives where this was discussed.

Cheers,
Med

De : Frank Brockners (fbrockne) <fbrockne@cisco.com>
Envoyé : jeudi 14 avril 2022 14:29
À : BOUCADAIR Mohamed INNOV/NET <mohamed.boucadair@orange.com>om>; Shwetha Bhandari <shwetha.bhandari@thoughtspot.com>om>; Greg Mirsky <gregimirsky@gmail.com>
Cc : Frank Brockners (fbrockne) <fbrockne=40cisco.com@dmarc.ietf.org>rg>; sfc-chairs@ietf.org; sfc@ietf.org; ippm@ietf.org; James Guichard <james.n.guichard@futurewei.com>om>; Tal Mizrahi <tal.mizrahi.phd@gmail.com>om>; draft-ietf-sfc-ioam-nsh@ietf.org
Objet : RE: [sfc] WGLC for https://datatracker.ietf.org/doc/draft-ietf-sfc-ioam-nsh/

Forgot to add: A clause like " The O-bit MUST be handled following the rules in and any updates to [RFC8300]“ simply states the obvious. draft-ietf-sfc-ioam-nsh does not touch or redefine the O-bit – hence the statement is at best optional. The reader might even wonder why the obvious is re-stated in the document. My preference is still to avoid any mentioning of the O-bit in draft-ietf-sfc-ioam-nsh.

Frank

From: Frank Brockners (fbrockne)
Sent: Thursday, 14 April 2022 14:24
To: mohamed.boucadair@orange.com<mailto:mohamed.boucadair@orange.com>; Shwetha Bhandari <shwetha.bhandari@thoughtspot.com<mailto:shwetha.bhandari@thoughtspot.com>>; Greg Mirsky <gregimirsky@gmail.com<mailto:gregimirsky@gmail.com>>
Cc: Frank Brockners (fbrockne) <fbrockne=40cisco.com@dmarc.ietf.org<mailto:fbrockne=40cisco.com@dmarc.ietf.org>>; sfc-chairs@ietf.org<mailto:sfc-chairs@ietf.org>; sfc@ietf.org<mailto:sfc@ietf.org>; ippm@ietf.org<mailto:ippm@ietf.org>; James Guichard <james.n.guichard@futurewei.com<mailto:james.n.guichard@futurewei.com>>; Tal Mizrahi <tal.mizrahi.phd@gmail.com<mailto:tal.mizrahi.phd@gmail.com>>; draft-ietf-sfc-ioam-nsh@ietf.org<mailto:draft-ietf-sfc-ioam-nsh@ietf.org>
Subject: RE: [sfc] WGLC for https://datatracker.ietf.org/doc/draft-ietf-sfc-ioam-nsh/

IMHO it would be better to refer to directly RFC8300 – since this is a stable reference; and it allows us to finish up draft-ietf-sfc-ioam-nsh and get the code points allocated. I-D.ietf-sfc-oam-packet is early stages and still evolving.

Cheers, Frank

From: mohamed.boucadair@orange.com<mailto:mohamed.boucadair@orange.com> <mohamed.boucadair@orange.com<mailto:mohamed.boucadair@orange.com>>
Sent: Thursday, 14 April 2022 13:28
To: Shwetha Bhandari <shwetha.bhandari@thoughtspot.com<mailto:shwetha.bhandari@thoughtspot.com>>; Greg Mirsky <gregimirsky@gmail.com<mailto:gregimirsky@gmail.com>>
Cc: Frank Brockners (fbrockne) <fbrockne=40cisco.com@dmarc.ietf.org<mailto:fbrockne=40cisco.com@dmarc.ietf.org>>; sfc-chairs@ietf.org<mailto:sfc-chairs@ietf.org>; sfc@ietf.org<mailto:sfc@ietf.org>; ippm@ietf.org<mailto:ippm@ietf.org>; James Guichard <james.n.guichard@futurewei.com<mailto:james.n.guichard@futurewei.com>>; Tal Mizrahi <tal.mizrahi.phd@gmail.com<mailto:tal.mizrahi.phd@gmail.com>>; draft-ietf-sfc-ioam-nsh@ietf.org<mailto:draft-ietf-sfc-ioam-nsh@ietf.org>
Subject: RE: [sfc] WGLC for https://datatracker.ietf.org/doc/draft-ietf-sfc-ioam-nsh/

Hi Shwetha,

I prefer we go for an explicit reference to I-D.ietf-sfc-oam-packet rather than “any update to RFC8300”. This is consistent with the usage in the other OAM draft.

Thank you.

Cheers,
Med

De : Shwetha Bhandari <shwetha.bhandari@thoughtspot.com<mailto:shwetha.bhandari@thoughtspot.com>>
Envoyé : jeudi 14 avril 2022 12:06
À : Greg Mirsky <gregimirsky@gmail.com<mailto:gregimirsky@gmail.com>>
Cc : BOUCADAIR Mohamed INNOV/NET <mohamed.boucadair@orange.com<mailto:mohamed.boucadair@orange.com>>; Frank Brockners (fbrockne) <fbrockne=40cisco.com@dmarc.ietf.org<mailto:fbrockne=40cisco.com@dmarc.ietf.org>>; sfc-chairs@ietf.org<mailto:sfc-chairs@ietf.org>; sfc@ietf.org<mailto:sfc@ietf.org>; ippm@ietf.org<mailto:ippm@ietf.org>; James Guichard <james.n.guichard@futurewei.com<mailto:james.n.guichard@futurewei.com>>; Tal Mizrahi <tal.mizrahi.phd@gmail.com<mailto:tal.mizrahi.phd@gmail.com>>; draft-ietf-sfc-ioam-nsh@ietf.org<mailto:draft-ietf-sfc-ioam-nsh@ietf.org>
Objet : Re: [sfc] WGLC for https://datatracker.ietf.org/doc/draft-ietf-sfc-ioam-nsh/

Hi Med, Greg,

How about this text :

“The O-bit MUST be handled following the rules in and any updates to [RFC8300] ."

Given that I-D.ietf-sfc-oam-packet  will update RF8300 and there could be others in future?

Thanks,
Shwetha

On Tue, Apr 12, 2022 at 9:24 PM Greg Mirsky <gregimirsky@gmail.com<mailto:gregimirsky@gmail.com>> wrote:
Hi Shwetha,
I believe that the text you've quoted is helpful. I would suggest changing references from [RFC8300] to [I-D.ietf-sfc-oam-packet] throughout that paragraph.

Regards,
Greg

On Tue, Apr 12, 2022 at 7:56 AM Shwetha Bhandari <shwetha.bhandari@thoughtspot.com<mailto:shwetha.bhandari@thoughtspot.com>> wrote:
Med,

Thanks for the details: this is exactly what we had before the latest revision:

4.2<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/html/draft-ietf-sfc-ioam-nsh-06*section-4.2__;Iw!!MZ3Fw45to5uY!NBsrzhHEf0Y_-Sindy74K4QDA6EWJjx35STSH-UxEi3eYIX0GVli9Sn1azrOPJVcI2qUzWfezK_1D2RpyFB_FOIpJPfzrvI$>I$>.  IOAM and the use of the NSH O-bit



   [RFC8300] defines an "O bit" for OAM packets.  Per [RFC8300<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/html/rfc8300__;!!MZ3Fw45to5uY!NBsrzhHEf0Y_-Sindy74K4QDA6EWJjx35STSH-UxEi3eYIX0GVli9Sn1azrOPJVcI2qUzWfezK_1D2RpyFB_FOIpEB5AbbE$>] the O

   bit must be set for OAM packets and must not be set for non-OAM

   packets.  Packets with IOAM data included MUST follow this

   definition, i.e. the O bit MUST NOT be set for regular customer

   traffic which also carries IOAM data and the O bit MUST be set for

   OAM packets which carry only IOAM data without any regular data

   payload.

This was removed as per the discussion in this thread. Please check https://mailarchive.ietf.org/arch/msg/sfc/srMit5zE8UseNOhxknAw_dqvj6M/<https://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/sfc/srMit5zE8UseNOhxknAw_dqvj6M/__;!!MZ3Fw45to5uY!NBsrzhHEf0Y_-Sindy74K4QDA6EWJjx35STSH-UxEi3eYIX0GVli9Sn1azrOPJVcI2qUzWfezK_1D2RpyFB_FOIp-CeLfeA$>

It looks like we are going in a loop here. This definition of SFC OAM packet to include the OAM data that comes in inner packets via the next protocol header chain is introduced in draft-ietf-sfc-oam-packet to update the RFC8300.
Jim, What are you thoughts on this? Should we reintroduce the above text ?

Thanks,
Shwetha


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