Re: [netmod] Adam Roach's No Objection on draft-ietf-netmod-entity-07: (with COMMENT)

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Thu, 11 January 2018 09:13 UTC

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Date: Thu, 11 Jan 2018 10:12:59 +0100
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Martin Bjorklund <mbj@tail-f.com>
Cc: adam@nostrum.com, iesg@ietf.org, netmod-chairs@ietf.org, draft-ietf-netmod-entity@ietf.org, netmod@ietf.org
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Subject: Re: [netmod] Adam Roach's No Objection on draft-ietf-netmod-entity-07: (with COMMENT)
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On Thu, Jan 11, 2018 at 09:49:24AM +0100, Martin Bjorklund wrote:

> Will do.  As it happens, I always just look into the MIBs distributed
> by libsmi, and it seems the MIB is not updated there ;-)

OK. My fault.

> Which leads
> to an interesting issue - the errata for the MIB not only changes the
> description in the comment, but it also changes the *value*.  I will
> thus do the same in the YANG module:
> 
>       enum peta {
>         value 14;
>         description
>           "Data scaling factor of 10^15.";
>       }
>       enum exa {
>         value 15;
>         description
>           "Data scaling factor of 10^18.";
>       }
> 
> This matches the verified MIB Errata, but since the original MIB is
> probably present in most distributions, I wouldn't be surprised if
> this object is not correctly implemented in real code...  When I
> googled for the MIB I found several instances of NON-updated MIBs, and
> zero instances of an updated MIB.

Yes. This is very subtle. Not changing the value would also have been
somewhat odd since tera and exa are then 'out of natural order'. But
it might have been more robust. Anyway, the errata says what it says
and all we can do now is likely to hope that people running into this
at the end find the errata linked to the RFC. Hence, I will commit the
errata fix to the libsmi repository now.

/js

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