Re: [ippm] Magnus Westerlund's Discuss on draft-ietf-ippm-initial-registry-14: (with DISCUSS and COMMENT)

"MORTON, ALFRED C (AL)" <acm@research.att.com> Thu, 05 December 2019 13:24 UTC

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From: "MORTON, ALFRED C (AL)" <acm@research.att.com>
To: Magnus Westerlund <magnus.westerlund@ericsson.com>, "iesg@ietf.org" <iesg@ietf.org>
CC: "draft-ietf-ippm-initial-registry@ietf.org" <draft-ietf-ippm-initial-registry@ietf.org>, "ietf@trammell.ch" <ietf@trammell.ch>, "ippm-chairs@ietf.org" <ippm-chairs@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>
Thread-Topic: Magnus Westerlund's Discuss on draft-ietf-ippm-initial-registry-14: (with DISCUSS and COMMENT)
Thread-Index: AQHVq1RHVx36x7bdVEWE4GseipRv76erd4DAgABhh4D//6yJ4A==
Date: Thu, 05 Dec 2019 13:24:15 +0000
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Subject: Re: [ippm] Magnus Westerlund's Discuss on draft-ietf-ippm-initial-registry-14: (with DISCUSS and COMMENT)
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> -----Original Message-----
> From: Magnus Westerlund [mailto:magnus.westerlund@ericsson.com]
> Sent: Thursday, December 5, 2019 8:15 AM
> To: MORTON, ALFRED C (AL) <acm@research.att.com>; iesg@ietf.org
> Cc: draft-ietf-ippm-initial-registry@ietf.org; ietf@trammell.ch; ippm-
> chairs@ietf.org; ippm@ietf.org
> Subject: RE: Magnus Westerlund's Discuss on draft-ietf-ippm-initial-
> registry-14: (with DISCUSS and COMMENT)
> 
> Hi Al,
> 
> > [acm]
> > Please see the e-mail exchange on
> > Éric Vyncke's DISCUSS (cleared)
> > (now listed as a Comment to keep it in the record) where he raised
> identical
> > issues, and we quickly proposed solutions for the working version of the
> > text.
> >
> 
> So clarifying that one is to set flow ID to zero and not use any next
> headers for this specific metrics likely work in most cases.
> 
> Do you agree that a measurement with varying flow ID or source ports over
> a measurement would be a different measurement that would then measure
> over the full set of potential paths that ECMP and similar mechanism may
> produce based on a specific set of source and destination IP address pair?
[acm] 
Yes, very much so.

> 
> Which measurements registrations are you implementing these changes into?
[acm] 
Almost all of them, I believe ICMP Echo-Request Echo-Reply 
was a special case.

> 
> Have we now created a situation where the text in the registry becomes
> crucial for correctly doing a measurement? 
[acm] 
No

> Or was that already the case
> prior to this change? What I mean is that the references do not define the
> metric to the detail level and consistency that the IANA registry does.
[acm] 
Your DISCUSS and Comment is on the Initial registry entries draft, 
and will apply to the registered metrics.  
I don't see a cross-reference problem here,
unless I am mistaken.

Al

> 
> Cheers
> 
> Magnus
> 
>