Re: [netmod] How to constrain a leaf to a read-only list of supported values?

[Andy Bierman <[e-mail]>]

Hi,

We keep having discussions about YANG conformance related issues.
The only unit of conformance is the YANG module, so it is possible to
think the way to solve the conformance/discovery problem is to put every
definition
in its own module. This is operationally absurd of course, so someday YANG
is going to need a real conformance model.


Andy


On Thu, Sep 1, 2016 at 12:48 AM, Balazs Lengyel <[e-mail]
> wrote:

> Hello,
>
> The proposed iana-entity.yang seems to take the same approach: one file
> defining 28 identities.
>
> And I share all your concerns about iana-if-type.
>
> Balazs
>
>
> On 2016-08-31 14:16, Vladimir Vassilev wrote:
>
>> On 08/31/2016 12:38 PM, Ladislav Lhotka wrote:
>>
>>> On 31 Aug 2016, at 11:10, Vladimir Vassilev <[e-mail]>
>>>> wrote:
>>>>
>>>> If you design your models using identityref and define the identities
>>>> in separate modules e.g. compression-zip.yang, compression-gzip.yang, etc.
>>>> you can just chose not to load the particular YANG models containing the
>>>> identities not supported when your device starts.
>>>>
>>> Right, and I have proposed this approach several times in the past.
>>> However, some people prefer that the modules defining identities mirror
>>> IANA and similar registries. In the case of iana-interface-types it also
>>> means that implementations have to deal with obsolete, obscure and
>>> experimental interface types that happen to be in the IANA registry but
>>> nobody will ever want to use.
>>>
>>> Lada
>>>
>> +1
>>
>> The 275 identities defined in iana-if-type.yang appearing as possible
>> /interfaces/interface/type tab completion options in a YANG aware cli or
>> drop-down menu in gui is annoying and stands out as an obvious problem.
>>
>> It is not late to split the file. No standard RFC YANG model includes
>> iana-if-type.yang yet. The actually referenced identities in current drafts
>> is less then 16 (grep-ing in my known YANG model archive) {ethernetCsmacd,
>> l2vlan, ieee8023adLag, ifPwType, pos, atm, atmSubInterface, sonet, otnOtu,
>> frameRelay, bridge, macSecControlledIF, fastdsl}
>>
>> If not single instance per file maybe dividing the file into categories
>> so if your device is atm aware you import iana-if-type-atm.yang and get
>> {atm, atmSubInterface}.
>>
>> However we can probably agree the iana-if-type.yang exception is not a
>> valid excuse for new models like the one in the example where there are 3
>> compression methods to not modularize the identity definitions into
>> separate files and not load identities the implementation does not support
>> but instead resolve to workaround solutions.
>>
>> Vladimir
>>
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>>
> --
> Balazs Lengyel                       Ericsson Hungary Ltd.
> Senior Specialist
> Mobile: [phone]              email: [e-mail]
>
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