Re: [netmod] rfc6991bis: yang:percentage

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Thu, 30 July 2020 13:26 UTC

Return-Path: <j.schoenwaelder@jacobs-university.de>
X-Original-To: netmod@ietfa.amsl.com
Delivered-To: netmod@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E2B7B3A1130 for <netmod@ietfa.amsl.com>; Thu, 30 Jul 2020 06:26:02 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.899
X-Spam-Level:
X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ygI6tJzYPwSk for <netmod@ietfa.amsl.com>; Thu, 30 Jul 2020 06:26:01 -0700 (PDT)
Received: from atlas5.jacobs-university.de (atlas5.jacobs-university.de [212.201.44.20]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B589B3A112D for <netmod@ietf.org>; Thu, 30 Jul 2020 06:26:00 -0700 (PDT)
Received: from localhost (demetrius5.irc-it.jacobs-university.de [10.70.0.222]) by atlas5.jacobs-university.de (Postfix) with ESMTP id 9632482F; Thu, 30 Jul 2020 15:25:58 +0200 (CEST)
X-Virus-Scanned: amavisd-new at jacobs-university.de
Received: from atlas5.jacobs-university.de ([10.70.0.198]) by localhost (demetrius5.jacobs-university.de [10.70.0.222]) (amavisd-new, port 10032) with ESMTP id irxzB5AgCRb1; Thu, 30 Jul 2020 15:25:58 +0200 (CEST)
Received: from hermes.jacobs-university.de (hermes.jacobs-university.de [212.201.44.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hermes.jacobs-university.de", Issuer "DFN-Verein Global Issuing CA" (verified OK)) by atlas5.jacobs-university.de (Postfix) with ESMTPS; Thu, 30 Jul 2020 15:25:58 +0200 (CEST)
Received: from localhost (demetrius5.irc-it.jacobs-university.de [10.70.0.222]) by hermes.jacobs-university.de (Postfix) with ESMTP id 3660520154; Thu, 30 Jul 2020 15:25:58 +0200 (CEST)
X-Virus-Scanned: amavisd-new at jacobs-university.de
Received: from hermes.jacobs-university.de ([212.201.44.23]) by localhost (demetrius5.jacobs-university.de [10.70.0.222]) (amavisd-new, port 10028) with ESMTP id i7zFo2k7hsXp; Thu, 30 Jul 2020 15:25:57 +0200 (CEST)
Received: from localhost (anna.jacobs.jacobs-university.de [10.50.218.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by hermes.jacobs-university.de (Postfix) with ESMTPS id B204E200E4; Thu, 30 Jul 2020 15:25:57 +0200 (CEST)
Date: Thu, 30 Jul 2020 15:25:57 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Benoit Claise <bclaise@cisco.com>
Cc: netmod@ietf.org
Message-ID: <20200730132557.n473s7layuruib3l@anna.jacobs.jacobs-university.de>
Reply-To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
Mail-Followup-To: Benoit Claise <bclaise@cisco.com>, netmod@ietf.org
References: <20200717191638.6wl3dqktcrnghuyl@anna.jacobs.jacobs-university.de> <87d04qzgpa.fsf@nic.cz> <820fc6fe-9c50-9cb1-9666-6efbacd7f200@cisco.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: inline
In-Reply-To: <820fc6fe-9c50-9cb1-9666-6efbacd7f200@cisco.com>
Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/Ivvvxhokme-HD36qnSBGiEowqeQ>
Subject: Re: [netmod] rfc6991bis: yang:percentage
X-BeenThere: netmod@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: NETMOD WG list <netmod.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/netmod>, <mailto:netmod-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/netmod/>
List-Post: <mailto:netmod@ietf.org>
List-Help: <mailto:netmod-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/netmod>, <mailto:netmod-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 30 Jul 2020 13:26:03 -0000

On Thu, Jul 30, 2020 at 02:58:22PM +0200, Benoit Claise wrote:
> On 20/07/2020 11:19, Ladislav Lhotka wrote:
> > Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> writes:
> > 
> > >    - Percentages are frequently used in YANG models but usages differ a
> > >      lot in precision and range. It is not clear what the proper
> > >      generic definition of a percentage type would be and whether it is
> > >      worth having it.
> > > 
> > >      RFC 7950 example:
> > > 
> > >           typedef percent { type uint8 { range "0 .. 100"; } }
> > > 
> > >      RFC 8294:
> > > 
> > >           typedef percentage { type uint8 { range "0..100"; } }
> > > 
> > >      I-Ds:
> > >           typedef percentage { type decimal64 { fraction-digits 5; } }
> > >           typedef percentile { type decimal64 { fraction-digits 2; } }
> > > 
> > >      The yang catalogue seems to be down. :-(
> > > 
> > >    - Proposal: do not add a percentage type since it is trivial to
> > >      define a context specific percentage type that matches range and
> > >      precision requirements (and there is already a definition in RFC
> > >      8294 for those who need exactly that definition).
> > I agree with this proposal. It is also possible to use
> > 
> >     units percent;
> > 
> > where necessary.
> On the other hand, when I look at the numerous percent/percentage
> occurrences in YANG model, it doesn't hurt to define that typedef.
> 
> https://yangcatalog.org/yang-search/ => search on "node name" and typedef
> only
> We can find 56 entries from IETF, IEEE, BBF, OC, MEF, vendors
> Most of them points to:
> 
>    *typedef*  percent {
>    	*type*  uint8 {
>    		*range*  "0 .. 100";
> 
>    	}
>    }
>

But that one is already defined in RFC 8294 in ietf-routing-types.
Does it make sense to define it again in yang-types?

/js

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