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Re: [netmod] instance data new backward compatibility text

Balázs Lengyel <balazs.lengyel@ericsson.com> Mon, 25 March 2019 21:59 UTC

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From: Balázs Lengyel <balazs.lengyel@ericsson.com>
To: "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: [netmod] instance data new backward compatibility text
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Date: Mon, 25 Mar 2019 21:59:43 +0000
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Subject: Re: [netmod] instance data new backward compatibility text
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Hello Jurgen,

You are right that this is important mostly for instance data prepared 
as a design/implementation activity; while not relevant for data coming 
from the node.
I will add it.

However in the first case it is vital!

For config files, and also for file documenting server capabilities we 
have had MANY problems with people changing the key values/identities of 
list entries.
They think it is a nice idea to provide better, more meaningful key 
values; however the NMS designers use these key values to detect 
changes; also during an upgrade process if a default configuration file 
is loaded again with slightly changed key values, then e.g. access 
control rules become duplicated.

regards Balazs

On 2019. 03. 25. 14:19, Juergen Schoenwaelder wrote:
> Hi,
>
> I am not sure why we have this new section. The notion of backwards
> compatibility for instance data is somewhat dubious. There text that
> is there now is potentially even harmful or it needs to be ignored. If
> I dump datastore content into an instance file, I get what I get. The
> text that is there may help with maunally edited instance files but
> this is where it ends. My proposal is to simply drop section 6 again.
>
> /js
>
-- 
Balazs Lengyel                       Ericsson Hungary Ltd.
Senior Specialist
Mobile: +36-70-330-7909              email: Balazs.Lengyel@ericsson.com

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