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Re: [netmod] Question on intefaces-state model

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Mon, 12 June 2017 17:21 UTC

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Date: Mon, 12 Jun 2017 19:21:42 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: "Bogaert, Bart (Nokia - BE/Antwerp)" <bart.bogaert@nokia.com>
Cc: "netmod@ietf.org" <netmod@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/eQ0fPzsSSj8Lb_aeJOjpMtNzB0o>
Subject: Re: [netmod] Question on intefaces-state model
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On Fri, Jun 09, 2017 at 10:55:20AM +0000, Bogaert, Bart (Nokia - BE/Antwerp) wrote:
> 
> We have a question regarding the statistics container as defined in the
> interfaces-state model.  This container defines one mandatory leaf
> (discontinuity-time) while all other leafs are optional.  What is the
> rationale behind this leaf being mandatory and not an optional field?
> 
> It does not make a lot of sense to return a discontinuity-time value and no
> counters if none of the counters are relevant for a specific interface.
> 
> Another alternative could be to add, via a deviation, a when clause to the
> container indicating for which ifType(s) the container is (or is not)
> present. But that would lead to not supporting the IETF interfaces model to
> the full extent.
>

The discontinuity-time is relevant for _any_ counter associated with
an interface, regardless whether the counter is defined in the
interfaces model or elsewhere. I have a hard time to imagine an
interface that has zero counters.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <http://www.jacobs-university.de/>

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