Re: [netmod] Quirky YANG

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Wed, 03 October 2018 16:43 UTC

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Date: Wed, 03 Oct 2018 18:43:29 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: tom petch <ietfc@btconnect.com>
CC: "netmod@ietf.org" <netmod@ietf.org>
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Subject: Re: [netmod] Quirky YANG
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Well, make sure you send your comments to softwire since they have to
sort this out.

/js

On Wed, Oct 03, 2018 at 04:11:13PM +0000, tom petch wrote:
> I wonder if anyone else on this list has looked at
>  https://datatracker.ietf.org/doc/draft-ietf-softwire-yang/
> currently in IETF Last Call.
> 
> It provides management for three tunnel types, Lw4o6, MAP-E and MAP-T
> betweeen CPE and Border Relay.  It defines a CPE module, a BR module and
> a module of common definitions.
> 
> It does not provide identities for the three tunnel types; rather, where
> it augments "/if:interfaces/if:interface" it specifies
>     when "if:type = 'ianaift:tunnel'";
> which to me says that a MAP-E (e.g.) specific object will get added to
> each and every tunnel of whatever type, which seems excessive.
> 
> Second, it defines four features, softwire-ce:algorithm (i.e.
> MAP-E/MAP-T) and softwire-ce:binding (i.e. Lw4o6) in the CPE module and
> then again softwire-br:algorithm and softwire-br:binding in the BR
> module.  It is unclear to me, from the I-D, whether support is for MAP-T
> and MAP-E; or either MAP-T or MAP-E - I find the I-D ambiguous on that
> point - but I would have expected there to be either two - Lw4o6 and
> MAP-ET - or three - Lw4o6, MAP-E and MAP-T features, not four; and for
> the features to be defined, along with tunnel identities, in the common
> module.
> 
> Odd, IMHO.
> 
> Tom Petch
> 
> _______________________________________________
> netmod mailing list
> netmod@ietf.org
> https://www.ietf.org/mailman/listinfo/netmod

-- 
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/>