Hi Tony,
I would argue that YANG is a data modeling language. Another disadvantage of
the bits type that it isn't augmentable with new bits. Hence, usage of unused
bits requires a new version of the module as opposed to an augmentation. For
that reason, we greatly limited their usage in routing modules and used
identities instead.
Thanks,
Acee
On 4/2/21, 12:14 PM, "netmod on behalf of Tony Li" <netmod-boun...@ietf.org on
behalf of tony...@tony.li> wrote:
Hi Lada,
Thanks for your reply. At heart, I guess I’m asking a more fundamental
question: is YANG intended as a data modelling language or as a data structure
modelling language?
Your reply suggests the former: structure is irrelevant to YANG. If that’s
true, then what’s the point in ‘position’? And why do you need ‘bits’ when you
have ‘binary’?
Confused,
Tony
> On Apr 2, 2021, at 1:27 AM, Ladislav Lhotka <ladislav.lho...@nic.cz>
wrote:
>
> Tony Li <tony...@tony.li> writes:
>
>> Hi,
>>
>> I have some basic questions about YANG. I’m pretty certain this is NOT
the right place to ask them, so please feel free to redirect me.
>>
>>
>> 1) Is there a way to define the width of an enumeration? Suppose I had
an enumeration that was in a 16 bit field, how do I describe that?
>
> In the description, if necessary. However, this should be an
implementation detail, as long as the underlying numeric type can accommodate
all enums.
>
> You could perhaps also define and enum for the highest possible value and
make in reserved.
>
>>
>> 2) How do I model a non-octet sized multi-bit field? For example, if
there is a 5 bit numeric value as part of some ‘bits’? Position only takes a
single value, I can’t really say ‘position 3-7’.
>
> In this case, I would question whether the 'bits' type is really
appropriate. It might be useful to split the value into multiple items in YANG.
>
> Lada
>
>>
>> Thanks,
>> Tony
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>
> --
> Ladislav Lhotka
> Head, CZ.NIC Labs
> PGP Key ID: 0xB8F92B08A9F76C67
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