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Re: [netmod] Adding system configuration to running [was: Re: Comments on NMDA-04]

Robert Wilton <rwilton@cisco.com> Thu, 14 September 2017 17:08 UTC

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To: Balazs Lengyel <balazs.lengyel@ericsson.com>, Martin Bjorklund <mbj@tail-f.com>
Cc: netmod@ietf.org
References: <9ec6b2e4-36a7-87e6-59fa-828855235835@ericsson.com> <20170914.163239.143365521945928900.mbj@tail-f.com> <4ce3efcd-6e88-9390-1241-21fb89985a9a@ericsson.com>
From: Robert Wilton <rwilton@cisco.com>
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Date: Thu, 14 Sep 2017 18:08:36 +0100
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Subject: Re: [netmod] Adding system configuration to running [was: Re: Comments on NMDA-04]
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On 14/09/2017 16:35, Balazs Lengyel wrote:
>
> See below!
>
> On 2017-09-14 16:32, Martin Bjorklund wrote:
>> Hi Balazs,
>>
>> Thanks for your review.  Comments inline.
>>
>> Balazs Lengyel<balazs.lengyel@ericsson.com>  wrote:
>>> Hello,
>>>
>>> Reading the draft-ietf-netmod-revised-datastores-04 some comments:
>>>
>>> General) The system often adds data to the <running> or <intended>
>>> datastore already not just to <operational>: e.g.
>>>
>>> UC1: I have a server configured in running. I need to bind it to an
>>> ip-address. The ip-address might be the local loopback address,
>>> however if that is only added to <operational>, validation will
>>> fail indicating that the server is bound to a non-existent
>>> address. How to handle this?
>>>
>>> UC2: I have a set of capabilities set by the system
>>> e.g. supported-reporting-intervals. I need to configure a job that
>>> MUST use one of these intervals. If the supported-reporting-intervals
>>> are only added to <operational> I can not validate the
>>> selected-interval in my configured job.
>>>
>>> My proposal is to allow the system to add data to running as
>>> well. Actually I think that is a more relevant case then adding
>>> configuration just to <operation>.
>> I think the consensus is that in general it is a bad idea if servers
>> (spontaneously) add data to <running>.  However, there is nothing in
>> the new or old architectures that prohibits this.
> BALAZS: I strongly disagree.  I know others are also adding stuff to 
> running as well.
> IMHO the above use cases are real and used and actually important for us.
> I would like to see them included in some way.
I basically agree with Martin here.

The architecture is cleaner if <running> is only written by the client.  
This avoid requiring clients tracking unexpected changes to running, and 
opens up the possibility of validating configuration off the box.  
Ideally extra stuff should be added into <intended> and then become 
visible in <operational>.

I understand that some systems add data to <running>, and this is fine.  
But I think that it is better for an architecture document to be silent 
on this point.

Thanks,
Rob


>
> regards Balazs
> -- 
> Balazs Lengyel                       Ericsson Hungary Ltd.
> Senior Specialist
> Mobile: +36-70-330-7909              email:Balazs.Lengyel@ericsson.com  
>
>
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