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

mohamed.boucadair@orange.com Wed, 27 April 2022 08:16 UTC

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From: <mohamed.boucadair@orange.com>
To: Shwetha Bhandari <shwetha.bhandari@thoughtspot.com>, James Guichard <james.n.guichard@futurewei.com>, "sfc-chairs@ietf.org" <sfc-chairs@ietf.org>
CC: "sfc@ietf.org" <sfc@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>
Thread-Topic: [sfc] WGLC for https://datatracker.ietf.org/doc/draft-ietf-sfc-ioam-nsh/
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Date: Wed, 27 Apr 2022 08:16:13 +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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Hi Shwetha, all,

The changes look great. Thanks.

There is one specific point not addressed in previous replies. This is related to this text:

      Next Protocol:  8-bit unsigned integer that determines the type of
         header following IOAM.  The semantics of this field are
         identical to the Next Protocol field in [RFC8300].


This means the new requested TBD_IOAM value will also be a valid next protocol. However, I wonder whether IOAM in IOAM in NSH is really something you want to have. If not, I suggest the text is updated to exclude it from the allowed value in the above excerpt.

Other than that, I think that the draft is ready to move forward.

Cheers,
Med

De : Shwetha Bhandari <shwetha.bhandari@thoughtspot.com>
Envoyé : mercredi 27 avril 2022 10:06
À : James Guichard <james.n.guichard@futurewei.com>om>; sfc-chairs@ietf.org
Cc : BOUCADAIR Mohamed INNOV/NET <mohamed.boucadair@orange.com>om>; Frank Brockners (fbrockne) <fbrockne=40cisco.com@dmarc.ietf.org>rg>; sfc@ietf.org; ippm@ietf.org; Tal Mizrahi <tal.mizrahi.phd@gmail.com>om>; draft-ietf-sfc-ioam-nsh@ietf.org; Greg Mirsky <gregimirsky@gmail.com>
Objet : Re: [sfc] WGLC for https://datatracker.ietf.org/doc/draft-ietf-sfc-ioam-nsh/

Dear SFC chairs,

A new version of the draft I-D.ietf-sfc-ioam-nsh has been submitted per the discussion in this thread.
https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-ioam-nsh-09
Can we please progress this draft to IESG if there are no further comments?

Thanks,
Shwetha

On Thu, Apr 14, 2022 at 6:41 PM Greg Mirsky <gregimirsky@gmail.com<mailto:gregimirsky@gmail.com>> wrote:
Hi Shwetha,
thank you for the proposed resolution. I agree with Med, direct normative reference to I-D.ietf-sfc-oam-packet seems like the logical conclusion of our discussion of the use of the NSH O bit. Please note that we're referring to I-D.ietf-sfc-oam-packet in the Active SFC OAM draft, e.g.,:
The O bit in NSH MUST be set, according to [I-D.ietf-sfc-oam-packet].

Regards,
Greg

On Thu, Apr 14, 2022 at 4:27 AM <mohamed.boucadair@orange.com<mailto:mohamed.boucadair@orange.com>> wrote:
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: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/<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-ietf-sfc-ioam-nsh/__;!!MZ3Fw45to5uY!LWQuxxxKpUum5gUoK44-znjehj2YRtlGMOATxfRVSc-7JOrPsk4BA4iP0oLQE4d0rObPhOCG_1iiipywftwMIMOEWh8lJI4$>

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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