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Re: [ippm] Ignas Bagdonas' Discuss on draft-ietf-ippm-twamp-yang-11: (with DISCUSS and COMMENT)

"MORTON, ALFRED C (AL)" <acm@research.att.com> Thu, 21 June 2018 21:17 UTC

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From: "MORTON, ALFRED C (AL)" <acm@research.att.com>
To: Mahesh Jethanandani <mjethanandani@gmail.com>, Ignas Bagdonas <ibagdona@gmail.com>
CC: "ippm-chairs@ietf.org" <ippm-chairs@ietf.org>, "draft-ietf-ippm-twamp-yang@ietf.org" <draft-ietf-ippm-twamp-yang@ietf.org>, The IESG <iesg@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>
Thread-Topic: [ippm] Ignas Bagdonas' Discuss on draft-ietf-ippm-twamp-yang-11: (with DISCUSS and COMMENT)
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Date: Thu, 21 Jun 2018 21:17:30 +0000
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Subject: Re: [ippm] Ignas Bagdonas' Discuss on draft-ietf-ippm-twamp-yang-11: (with DISCUSS and COMMENT)
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Hi Ignas and Mahesh,

> -----Original Message-----
> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Mahesh Jethanandani
> Sent: Thursday, June 21, 2018 4:47 PM
> To: Ignas Bagdonas <ibagdona@gmail.com>
> Cc: ippm-chairs@ietf.org; draft-ietf-ippm-twamp-yang@ietf.org; The IESG
> <iesg@ietf.org>; ippm@ietf.org
> Subject: Re: [ippm] Ignas Bagdonas' Discuss on draft-ietf-ippm-twamp-yang-
> 11: (with DISCUSS and COMMENT)
> 
> Hi Ignas,
> 
> > On Jun 20, 2018, at 8:50 AM, Ignas Bagdonas <ibagdona@gmail.com> wrote:
> >
...
> >
> > ----------------------------------------------------------------------
> > DISCUSS:
> > ----------------------------------------------------------------------
> >
> > I have three large areas of questions related to this model. They are not
> > related to the contents of the module itself but to the broader scope of where
> > this model can and should fit in the overall context of practical manageability
> > and usability.
> >
> > 1. Operational state. Section 2 defines operational aspects of the configured
> > TWAMP mechanisms as being out of scope. How does that relate to the motivation
> > goals in section 1? Having no common machine readable mechanism for retrieving
> > measurement results and verifying the operation of measurement processes does
> > not seem to help in reducing the need for proprietary mechanisms.
> 
> The idea behind describing operational part of the model as out of scope,
> particularly as they relate to measurement results, relates the work that
> is currently going on in the “Registry of Performance Metrics (PM)”,
> something the IPPM WG is trying to finish. Once that work is complete,
> this model can be enhanced or another one written to provide the data
> needed for PM.
[acm] 

One clarification on the response above. The TWAMP measurement protocol
is completely agnostic to *what* metrics are measured, but we made an 
exception in one case to take advantage of other IPPM work on the PM Registry.

It would be straightforward to build an independent model for the performance 
metrics/results in future, because the parameter and output formats are 
heavily specified in the Registry now, and that model would be applicable 
beyond TWAMP and available for any users of the Registry.

Al


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