Re: [netmod] Questions about how to assign default values with YANG

[Juergen Schoenwaelder <[e-mail]>]

On Wed, Jan 20, 2021 at 10:51:09AM +0000, Italo Busi wrote:
> 
> Does it mean that a server may not use/implement in the operational datastore a leaf for which a YANG default statement has been defined?
>

RFC 7950 section 7.6.1 mentions describes situations where a leaf is
conditional, i.e., there is when condition or an if-feature expression
or the leaf is a case node.

> What would be the value of defining a YANG default statement for  config false leaf?
>

Technically, this can happen because a type has a defined default
value and this type may be used by config false leafs.

An example is the zero-based-counter32 typedef in RFC 6991. However,
this style may be debated since it (mis)uses a default statement to
define an initial value. I am not sure whether the pattern of using
default statements for specifying intial values is a good one.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: [phone]         Campus Ring 1 | 28759 Bremen | Germany
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