Re: [ippm] Call for adoption for draft-mirsky-ippm-hybrid-two-step

I agree that this type of work is in-charter.

I can't speak to whether this answers a big need or anyone would deploy it,
but I don't see a fundamental problem with adoption, assuming there are
satisfactory answers to the questions below.

I can see how something like this could go haywire, with followon packets
getting misrouted, reordered, or lost, and wonder if we have enough
experience with it to be a standard, or if we should instead aim for
experimental.

Some more minor comments:

I found the motivation in the introduction to be a bit hard to understand,
and the abstract could use a sentence or two explaining what this protocol
specifically does.

IIUC since the last major presentation @IETF 113, the model seems to have
evolved from each intermediate node generating its own followon packet,
instead the ingress node generates one and each intermediate node appends
to the followup. I hope that's right?

It's also disturbing to me that there doesn't seem to be strong wire-image
synchronization between the trigger packet and followon packet via a common
sequence number or something else. This could lead to confusion at the
egress.

What assurances are there that the followon packet followed the same path
from ingress to egress as the trigger packet? What are the consequences of
this not happening and remaining undetected?

This is not very important, but I find "hybrid two-step" to be a
nondescriptive name, and might prefer something like "IOAM Followon".

Martin

On Tue, Sep 19, 2023 at 11:28 AM Haoyu Song <haoyu.song@futurewei.com>
wrote:

> IPPM WG,
>
>
>
> As a coauthor, I support the adoption of the draft as the WG document. The
> hybrid approach complements with the other IOAM approaches well and has its
> own merits.  Thanks!
>
>
>
> Best,
>
> Haoyu
>
>
>
> *From:* ippm <ippm-bounces@ietf.org> *On Behalf Of * Tommy Pauly
> *Sent:* Wednesday, September 13, 2023 9:22 AM
> *To:* IETF IPPM WG <ippm@ietf.org>
> *Subject:* [ippm] Call for adoption for draft-mirsky-ippm-hybrid-two-step
>
>
>
> Hello IPPM,
>
>
>
> This email starts a call for adoption for
> draft-mirsky-ippm-hybrid-two-step. This draft has been around for a while
> and discussed several times on list and in WG meetings.
>
>
>
> https://datatracker.ietf.org/doc/draft-mirsky-ippm-hybrid-two-step/
>
> https://www.ietf.org/archive/id/draft-mirsky-ippm-hybrid-two-step-15.html
>
>
>
> Please review the document and email the list with your comments, and if
> you think IPPM should adopt this work.
>
>
>
> This call for adoption will last three weeks and end on *October 4th*.
>
>
>
> Best,
>
> Tommy
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>