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

[Juergen Schoenwaelder <[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.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: [phone]         Campus Ring 1 | 28759 Bremen | Germany
Fax:   [phone]         <http://www.jacobs-university.de/>