Re: [netmod] I-D Action: draft-ietf-netmod-entity-02.txt

["Bogaert, Bart (Nokia - BE)" <[e-mail]>]

On Wed, Mar 08, 2017 at 02:48:15PM +0000, Bogaert, Bart (Nokia - BE) wrote:
> Hi,
> 
> > If we pick the former, it will not be possible to configure a 
> > component with a system controlled parent (unless you also add the 
> > system controlled parent to the configuration).
> > [Bart Bogaert] Is there a reason to only have this parent in the 
> > state tree and not in the config tree?
> 
> I am not sure I understand the question.  Suppose the config tree is 
> empty, and the system boots and populates the state tree with all 
> detected harwdare.  Next, a client would like to pre-provision a 
> module in a chassis that exists in state.  If the leafref is to the 
> config tree, the client would have to create both the chassis and the 
> module in the config tree, since the leafef would otherwise fail to
validate.
> 
> [Bart Bogaert] Ok, so you are looking for a solution that refers to an 
> entry in the state tree.  I always thought that one could not refer 
> from config to state but it seems I misunderstood this since this is 
> exactly what you are proposing.
> 
> > If we pick the latter you will not get any validation (since it has 
> > to be require-instance false).
> >
> > It is fine w/ me to change the type string to a leafref of the 
> > former
> type.
> 
> Correction: I am fine with changing the string to a leafref to state.
> 
> > [Bart Bogaert] If we leave it as a string it would mean that an 
> > external application would have to check whether the value of the 
> > string actually corresponds to a component that should exist (in the 
> > case of a non-system-controlled parent)?
> 
> So are you ok with a leafref to state?
> 
> [Bart Bogaert] Since that seems possible this would solve the problem.  
> I'm checking this with our people.

Are you discussing leafref to a config false node with require instance
false? I am not sure this is valid YANG.

[Bart Bogaert] Well this is what I was thinking too but this was suggested
by Martin.

Regards, Bart
/js

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Juergen Schoenwaelder           Jacobs University Bremen gGmbH
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