[mpls] Re: Poll: IOAM and PSD

[Greg Mirsky <[e-mail]>]

Hi Michael,
I don't think that "IOAM requires mutable data" is an accurate statement. RFC
9326 IOAM Direct Export <https://datatracker.ietf.org/doc/rfc9326/> indeed
defines optional parameters, Flow ID and Sequence Number, to ease the
correlation process of collected telemetry data. For some applications,
e.g., DetNet over MPLS <https://datatracker.ietf.org/doc/rfc8964/>, both
these parameters already are present as part of the DetNet MPLS
encapsulation as S-label (Service) and Sequence Number in d-CW or d-ACH,
respectively. Furthermore, the IPPM WG draft on collecting telemetry data
<https://datatracker.ietf.org/doc/draft-ietf-ippm-hybrid-two-step/> can be
used without the use of the optional IOAM-DEX fields, i.e., Flow-ID and
Sequence Number.

Regards,
Greg

On Sat, Aug 3, 2024 at 6:43 AM Michael Menth <[e-mail]> wrote:

> Hi all,
>
> we're not operators but researchers who implemented some IOAM flavors in
> combination with SR using P4 on Tofino. We've presented some results at an
> interim meeting before:
> https://datatracker.ietf.org/meeting/interim-2024-mpls-01/session/mpls
>
> IOAM requires mutable data. In combination with multiple labels, e.g., for
> SR, these mutable data need to be near the bottom of the stack, otherwise
> they get popped along the way. Moving them to PSD makes encoding more
> efficient without increasing the effective header length that needs  to be
> parsed. Therefore, we think PSD is the better option for applications like
> IOAM.
>
> Regards
>
> Michael
>
> Am 30.07.2024 um 17:25 schrieb Tony Li:
>
> [WG chair hat: on]
>
>
>
> Hi all,
>
>
>
> We’ve had many discussions about IOAM and PSD over the last few years. We
> need to reach consensus on the problems that need to be addressed in these
> areas. Therefore, we would like to hear from everyone, especially
> independent operators:
>
>
>
>    1.
>
>    There are many flavors of IOAM.  Which ones would you like to
>    deploy/implement with MNA?
>    2.
>
>    Do you have other applications of MNA that have not been proposed yet?
>
>
>
>  This poll will close in two weeks, at 9am PDT, Aug 13.
>
>
>
> Regards,
>
> MPLS chairs
>
> _______________________________________________
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>
> --
> Prof. Dr. habil. Michael Menth
> University of Tuebingen
> Faculty of Science
> Department of Computer Science
> Chair of Communication Networks
> Sand 13, 72076 Tuebingen, Germany
> phone: [phone]mailto:[e-mail] <[e-mail]>http://kn.cs.uni-tuebingen.de
>
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