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Re: [netmod] 6021 ipv4-prefix

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Thu, 18 April 2019 10:26 UTC

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Date: Thu, 18 Apr 2019 12:26:04 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Mikael Abrahamsson <swmike@swm.pp.se>
CC: netmod@ietf.org
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Subject: Re: [netmod] 6021 ipv4-prefix
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On Thu, Apr 18, 2019 at 11:43:05AM +0200, Mikael Abrahamsson wrote:
 
> 2001:db8::/64 and 2001:db8::1/64 are NOT the same if you use them.

Why are they not the same if you define a prefix?
 
> https://tools.ietf.org/html/rfc6020#section-9.1
> 
> "   For most types, there is a single canonical representation of the
>    type's values.  Some types allow multiple lexical representations of
>    the same value, for example, the positive integer "17" can be
>    represented as "+17" or "17".  Implementations MUST support all
>    lexical representations specified in this document."
> 
> I don't know what the word "lexical" representation means here. Let's take
> another example.
> 
> If I commit "+17.4" into an integer, should I expect the netconf server to
> round this down to 17 and commit that? This is effectively the same thing as
> the above example. When I tried this just now, I got that 17.4 is not a
> valid integer from the software I am using. Is this software doing the wrong
> thing?

+17.4 is not an integer, so this is an error (not because of the + but
because of the . followed by additional digits). +17 is I think a
valid integer value but the + will be dropped in the canonical
representation.

/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/>

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