Re: [netmod] rfc6991bis: yang:percentage

Benoit Claise <bclaise@cisco.com> Thu, 30 July 2020 12:58 UTC

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To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>, netmod@ietf.org
References: <20200717191638.6wl3dqktcrnghuyl@anna.jacobs.jacobs-university.de> <87d04qzgpa.fsf@nic.cz>
From: Benoit Claise <bclaise@cisco.com>
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Date: Thu, 30 Jul 2020 14:58:22 +0200
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Subject: Re: [netmod] rfc6991bis: yang:percentage
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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";

    	}
    }
          

Regards, Benoit


>
> Lada
>
>> -- 
>> 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/>
>>
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