Re: [netmod] Clarification Question on draft-dsdt-nmda-guidelines-01

[Robert Wilton <[e-mail]>]

Hi Xufeng,


On 14/06/2017 14:01, Xufeng Liu wrote:
> Hi Juergen,
>
> Thanks for the confirmation.
> As for the distinction between applied configuration and operational, I think that it has been determined to be useful in some use cases. We can create a separate leaf in such a case.
Yes, I think that this is exactly the right approach.

In the general case, a single leaf for applied configuration and the 
operational value is normally sufficient.

But in some cases (e.g. where a value could be configured and/or 
negotiated via protocol) then it sometimes useful to both see the input 
into the protocol negotiation and also the resultant output value.

Here, there is a choice to be made to decide whether the extra config 
false leaf represents the input value into the negotiation, or the 
output value.  I think that the decision probably depends on the 
protocol semantics, but all things being equal, there is a benefit if 
the configured value and actual operational value end up being 
represented by the same leaf/path (since this in the case in the 
mainline case where extra config false leaves are not required).

Thanks,
Rob


>
> Regards,
> - Xufeng
>
>> -----Original Message-----
>> From: Juergen Schoenwaelder [mailto:[e-mail]]
>> Sent: Tuesday, June 13, 2017 4:10 PM
>> To: Xufeng Liu <[e-mail]>
>> Cc: [e-mail]; [e-mail]
>> Subject: Re: Clarification Question on draft-dsdt-nmda-guidelines-01
>>
>> Hi,
>>
>> the typical -state tree consists of config false nodes and hence it represents
>> operational state. This is not a transitioning period question, this is how -state
>> trees were designed. Note also that the applied configuration is part of the
>> operational state in NMDA - for config true objects, there is no difference
>> between the applied configuration value and the operationally used value - they
>> are the same.
>>
>> /js
>>
>> On Tue, Jun 13, 2017 at 07:53:32PM +0000, Xufeng Liu wrote:
>>> During discussing the adoption of this guidelines, a question came up w.r.t. the
>> semantics of the non-NMDA "-state" module during the transitioning period:
>>> What kind of state do the leaves in the "-state" module represent? The applied
>> configuration or the actually used operational data?
>>> Since only of the two types can be represented, what is the guideline to model
>> the other type?
>>> Thanks,
>>> - Xufeng
>> --
>> Juergen Schoenwaelder           Jacobs University Bremen gGmbH
>> Phone: [phone]         Campus Ring 1 | 28759 Bremen | Germany
>> Fax:   [phone]         <http://www.jacobs-university.de/>
> .
>