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Re: [babel] Babel-RTT information model and example parameters

"STARK, BARBARA H" <bs7652@att.com> Fri, 26 July 2019 21:11 UTC

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From: "STARK, BARBARA H" <bs7652@att.com>
To: Baptiste Jonglez <baptiste.jonglez@imag.fr>
CC: Mahesh Jethanandani <mjethanandani@gmail.com>, "babel@ietf.org" <babel@ietf.org>
Thread-Topic: Babel-RTT information model and example parameters
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Date: Fri, 26 Jul 2019 21:11:19 +0000
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Subject: Re: [babel] Babel-RTT information model and example parameters
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Hi Baptiste,
I think you ask an excellent question. We have one case in the current info model of an implementation-specific parameter (the Hello history). After much discussion, we agreed it was useful and easy enough for others to implement — so we kept it. 

But in general — you’re absolutely right that we want to avoid implementation-specific parameters. 

I also think it’s unlikely that people will want to be configuring such parameters (assuming this is all wildly successful and being used by “average” people). 

The only parameter I think is definitely needed is one to enable/disable use of RTT in metric calculations. 

If we ended up with just that, I wouldn’t be upset. But if there is more, that’s fine. I do like the idea of not introducing implementation-specific parameters. 

Thx,
Barbara 

> On Jul 25, 2019, at 11:13 AM, Baptiste Jonglez <baptiste.jonglez@imag.fr> wrote:
> 
> Hi Barbara, Mahesh,
> 
> The discussion about the information model yesterday and Juliusz' email on
> policies got me thinking about the parameters of the babel-rtt extension.
> 
> Should the information model specify parameters that are not really part
> of the spec?  I'm thinking of the example function for metric computation
> and its 3 parameters rtt-min, rtt-max, max-rtt-penalty:
> 
>  https://tools.ietf.org/html/draft-ietf-babel-rtt-extension-00#section-2.2.1
> 
> This metric function is just an example: an implementation is free to do
> something totally different.  So, does it make sense to add the
> corresponding parameters (as ro or rw) to the information model?
> 
> Sorry if this is a dumb question, I'm quite new to this information model / YANG thing.
> 
> Thanks,
> 
> -- 
> Baptiste Jonglez
> PhD student
> Univ. Grenoble Alpes <https://www.univ-grenoble-alpes.fr/>
> LIG lab <https://www.liglab.fr/>
> Drakkar team <http://drakkar.imag.fr/>  |  Polaris team at INRIA <https://team.inria.fr/polaris/>

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