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Re: [netmod] draft-ietf-softwire-yang-13

tom petch <ietfc@btconnect.com> Thu, 27 December 2018 15:06 UTC

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From: tom petch <ietfc@btconnect.com>
To: Martin Bjorklund <mbj@tail-f.com>
CC: "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: draft-ietf-softwire-yang-13
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Date: Thu, 27 Dec 2018 15:06:01 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/I_YTzT2uSOPOutA3nyzaLrItcc0>
Subject: Re: [netmod] draft-ietf-softwire-yang-13
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----- Original Message -----
From: "Martin Bjorklund" <mbj@tail-f.com>
To: <ietfc@btconnect.com>
Cc: <netmod@ietf.org>
Sent: Thursday, December 27, 2018 12:08 PM

> tom petch <ietfc@btconnect.com> wrote:
> > Martin
> >
> > The Acknowledgements for
> > draft-ietf-softwire-yang-13
> > thank you for your work on this I-D (on the IESG Telechat for 10th
> > January 2019) so can you tell me where my YANG is going wrong.
> >
> > The module has
> >   augment "/if:interfaces/if:interface" {
> >     when "derived-from(if:type, 'iana-tunnel-type:aplusp')";
> > and defines aplusp as a tunnel type in section 10.
> >
> > A suggestion I made last October was to have a base for the three
> > protocols covered here - MAP-E, MAP-T, Lw406 - and then derive three
> > separate entities therefrom for the three protocols; I can see no
> > derivation.  In which case, when is
> >
> >     when "derived-from(if:type, 'iana-tunnel-type:aplusp')";
> >
> > going to be true?
>
> Right; either they have to define derived identities as you suggested,
> or this need to change to 'derived-from-or-self'.

.. or drop the 'derived' altogether; if there is only 'aplusp', as at
present, then I see no need for 'derived' and inserting one
unnecessarily leaves scope for a future addition to be true when it is
not wanted.  I can see it either way.

Tom Petch

>
> /martin
>

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