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Re: [babel] Last-minute tightening in rfc6126bis

David Schinazi <dschinazi.ietf@gmail.com> Mon, 29 April 2019 00:21 UTC

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From: David Schinazi <dschinazi.ietf@gmail.com>
Date: Sun, 28 Apr 2019 17:20:55 -0700
Message-ID: <CAPDSy+4UZdm9ia=PUuEM7eGA-APgpwUKfn7d+Qd-1JbJdkWVeQ@mail.gmail.com>
To: Juliusz Chroboczek <jch@irif.fr>
Cc: Babel at IETF <babel@ietf.org>
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Subject: Re: [babel] Last-minute tightening in rfc6126bis
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Hi Juliusz,

I can confirm that my former implementation did not use seqnos for route
selection.

I support this change to the document.

David

On Fri, Apr 26, 2019 at 3:07 AM Juliusz Chroboczek <jch@irif.fr> wrote:

> Dear all,
>
> Joao Sobrinho has sent me his observations about convergence of a certain
> class of routing protocols in the presence of metrics that are not
> left-distributive.  In short, it turns out that protocols such as DSDV can
> cause persistent blackholes in some topologies if the metric being used is
> not left-distributive.
>
> Happily enough, Babel does not belong to the class of protocols that are
> problematic.  However, the current text describes the relevant property in
> non-normative language.  Thanks to Sobrinho's explanation, I've decided to
> make the relevant property into a MUST.  I believe that all existent
> implementations already have the right property.
>
> I've just committed the relevant changes to the github repository:
>
>
> https://github.com/jech/babel-drafts/commit/5b038542a765b550cec487878f9f0acc2c2f82b0
>
> I'll let them simmer for a few days, then push a new revision to the
> datatracker.
>
> -- Juliusz
>
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