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Re: [netmod] diffserv model questions

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Tue, 19 May 2015 20:39 UTC

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Date: Tue, 19 May 2015 22:39:29 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: "Aseem Choudhary (asechoud)" <asechoud@cisco.com>
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Subject: Re: [netmod] diffserv model questions
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On Tue, May 19, 2015 at 07:57:26PM +0000, Aseem Choudhary (asechoud) wrote:
> Hi Juergen,
> 
> Please find the replies inline.
> 
> -thanks,
> Aseem
> 
> On 5/18/15, 10:20 AM, "Juergen Schoenwaelder"
> <j.schoenwaelder@jacobs-university.de> wrote:
> 
> >Hi,
> >
> >what is the purpose of the feature policy-template-support in
> >draft-asechoud-netmod-diffserv-model-01.txt? Can I use the model
> >without this feature?
> >
> >I also note that no implementable object is left in
> >ietf-diffserv-policy if I do not support the feature
> >policy-template-support. Is this useful?
> 
> [AC] ietf-diffserv-policy module defines policy as a template. The other
> option is to configure & apply it directly under target as defined in
> ietf-diffserv-target module.

OK, but why is there a feature since this 'policy' is an extension
defined in a separate YANG model?

> >Is it a bug or a feature to support inline classifier definitions? Is
> >it correct that actions are always 'inline' so to say? Is this a bug
> >or a feature?
> 
> [AC] Classifier can be defined inline or can be defined as a separate
> template and referred in the policy definition.

Yes, but is this a bug or a feature? From an implementation
perspective, this sounds like extra cost. So what is the benefit of
having both options?

> All the actions are defined inline. This is the most common use-case.

Hm. Why are classifiers and actions treated differently? Perhaps some
discussion of the design decisions somewhere in the document would be
useful.

/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/>

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