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Re: [homenet] Dynamic metrics in IS-IS [was: Info about IS-IS demo from Bits N Bites Prague]

Henning Rogge <hrogge@gmail.com> Sun, 20 September 2015 12:58 UTC

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References: <55FA3EF5.6000704@opensourcerouting.org> <87mvwjprwl.wl-jch@pps.univ-paris-diderot.fr>
From: Henning Rogge <hrogge@gmail.com>
Date: Sun, 20 Sep 2015 14:57:34 +0200
Message-ID: <CAGnRvure=W90ZYpaVSJBLoTzq=6ypE3ef-XEmHSzLPZdV+BT-Q@mail.gmail.com>
To: Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr>
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Cc: "homenet@ietf.org Group" <homenet@ietf.org>, Christian Franke <chris@opensourcerouting.org>
Subject: Re: [homenet] Dynamic metrics in IS-IS [was: Info about IS-IS demo from Bits N Bites Prague]
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On Fri, Sep 18, 2015 at 7:18 PM, Juliusz Chroboczek
<jch@pps.univ-paris-diderot.fr> wrote:
>> - Dynamic IS-IS Route Metric updating based on WiFi QualityInfo
>
> This is interesting.  Could you please share your experimental data?
>
> Getting dynamic metrics right in link-state is tricky, and using them in
> a reliably flooded link-state routing protocol has never been done before
> to my knowledge.  I have no doubt that you and David are highly competent
> engineers, but since this is something that has never been done before,
> I think it is essential that you share your experimental data.
>
> I refer you to [1] that compares an early version of babeld with an early
> version of OLSR-ETX.  Henning is a highly competent engineer, at it took
> him years of hard work to get ETX right in OLSR.

I would also be interested in this...

a few years ago I wrote a variant of OLSR (v1) with a semi-reliable
transport (some linklocal retransmission scheme) but stopped working
on the thing because ETX routing metric I had contained too much
change/noise anyways.

Reliability is not that useful if the metric has changed in a relevant
way between two iterations of the update.

Henning Rogge

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