Re: [yang-doctors] IANA full-registry definition

Jürgen,
> Benoit,
>
> I think Ruediger's problem is a BGP module where they modeled BGP
> capabilities as identities and they wanted to report the negotiated
> capabilities as config false data.
Bingo.

> This is problematic since not all
> capability numbers have an identity defined and the set of known
> identities may differ from implementation to implementation.  It would
> be much easier and more robust to simply report the capability
> numbers. Yes, this is less readable for a human, but much more robust
> for automation since clients know they always get a number.
>
> An alternative would be to create a union of an identity and a uint8
> but this does not address the problem that the set of identities known
> by different implementations can differ. One could fix this problem by
> moving from identities to enums since an enum fixes the set of known
> enums. Whether it is worth to have a union of enums and numbers needs
> to be decided by BGP people. I would suggest to simply define (in
> ietf-bgp-types) a
>
> typedef capability {
>    type uint8;
>    description
>      "BGP capability as maintained by IANA in the BGP capability
>       code registry";
>    reference
>      "RFC 5492: Capabilities Advertisement with BGP-4";
> }
>
> and then use bt:capability that instead of the much more complicated
> identityref { base bt:BGP_CAPABILITY; } to report the BGP capabilities.
Thanks, B.
>
> /js
>
> On Sat, Mar 30, 2019 at 02:44:06PM +0100, Benoit Claise wrote:
>> Hi Doctors,
>>
>> I was approached by Ruediger with this problem statement. I'll let Ruediger
>> extend the problem description if necessary.
>>
>> When we model an IANA registry with YANG, we model the entries one by one as
>> new values are assigned by IANA.
>> There are some IANA registries with clear ranges. For example, fields with a
>> couple of bits.
>> Would it be possible to have a generic way (YANG
>> typedef/identities:whatever) that would report all entries, even the ones
>> not yet assigned. The latter would report the observed values.
>>
>> Regards, Benoit
>>
>>
>>
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