Re: [netmod] Question on draft-wu-netmod-factory-default

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Tue, 26 March 2019 07:22 UTC

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Date: Tue, 26 Mar 2019 08:22:42 +0100
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Joe Clarke <jclarke@cisco.com>
CC: Qin Wu <bill.wu@huawei.com>, "netmod@ietf.org" <netmod@ietf.org>
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Subject: Re: [netmod] Question on draft-wu-netmod-factory-default
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On Tue, Mar 26, 2019 at 03:12:26AM -0400, Joe Clarke wrote:
> On 3/26/19 01:51, Juergen Schoenwaelder wrote:
> > Qin,
> > 
> > the idea should be to make things simpler, not more complex. Perhaps
> > it is not necessary to expose N options to reset a device. Perhaps a
> > simple "factory-reset" RPC which resets all relevant datastores in an
> > implementation specific manner is sufficient. Why expose more details
> > to the management client?
> 
> This would certainly make it simpler from the RPC standpoint.  However,
> if one can <get-data> from the factory-default DSes, I still think there
> is a need to know what factory-default DS maps to what other DS (in the
> case where there might be multiple that are different).
>

The notion of multiple factory-default datastores sounds complex. And
what is a management application going to do with them? How would a
management application know which sets of datastores to reset together
in a meaningful way?

My naive interpretation of the factory default DS (a single one) would
be that it exposes the content you will find in <running> after the
factory-reset has been executed. An extended version of Figure 2 of
RFC 8342 would look like this:

     +-------------+                 +-----------+        +-----------+
     | <candidate> |                 | <startup> |        | <factory> |
     |  (ct, rw)   |<---+       +--->| (ct, rw)  |        | (ct, ro)  |
     +-------------+    |       |    +-----------+        +-----------+
            |           |       |           |                   |
            |         +-----------+         |                   |
            +-------->| <running> |<--------+                   |
                      | (ct, rw)  |<----------------------------+
                      +-----------+

And exposing such a factory default datastore would be optional I
think.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>