Re: [netconf] Defaults and NP containers in YangPush

["Rob Wilton (rwilton)" <[e-mail]>]

Hi Martin,

I've not thought deeply about this, but I also probably agree with you.

However, I'm not sure that your position is necessarily obvious.  Hence, it might be nice if this was formally specified somewhere.  I also think that the "with-defaults" behaviours shouldn't necessary apply the same way to all datastores.  E.g. a server might want to choose "explicit" mode for <running>, but perhaps "trim" or "report-all" for <intended>.

Maybe there should be a bis version of RFC 6243 ... covering datastores and YANG push.

Thanks,
Rob


-----Original Message-----
From: netconf <[e-mail]> On Behalf Of Martin Bjorklund
Sent: 12 December 2019 08:57
To: balazs.lengyel=[e-mail]
Cc: [e-mail]; [e-mail]
Subject: Re: [netconf] Defaults and NP containers in YangPush

Hi,


Balázs Lengyel <balazs.lengyel=[e-mail]> wrote:
> Hello,
> 
> If I have the data model
> 
>  
> 
> container cont1 {
> 
> presence “xx”;
> 
>   container cont2 {
> 
>     leaf leaf1 {
> 
>       type string;
> 
>       default ddd;
> 
> }}}
> 
>  
> 
> And I create cont1
> 
> *	should Yang-Push report cont2 or leaf1 as created?
> *	Is this affected by with-default ?

Great question!

I think it must be affected by the server's basic-mode for with-defaults.

My assumption is that we want the subscriber to be able to keep a copy of the data on the publisher, and we must allow different default handling strategies in this copy - i.e., allow different implementation strategies.

[Another way of viewing this is that if we pass the data in the notif back to the server in an edit-config, it should effectively be a no-op.]

So, a 'report-all' server will send 'leaf1' in the notif, but an 'explicit' or 'trim' server will not send it.

Here's another case.  After your operation above, suppose a client sets 'leaf1' to 'ddd'.  A 'trim' server will not include 'leaf1' in the notis, but an 'explicit' will include it.  (And a 'report-all'
server will not see a change at all, since 'leaf1' already had 'ddd').

This means that the subscriber may need to be aware of the server's basic-mode, in order to be able to correctly interpret the notifs.


/martin
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