[Babel-users] CRXN/DN42: interconnecting overlay networks with Babel and BGP

[Marek Küthe]

On Mon, 20 Feb 2023 16:51:52 +0100
Juliusz Chroboczek <jch at irif.fr> wrote:

> > I think the answer should be that no matter how you mess with the metrics
> > babel should still remain loop-free, right?  
> 
> Both Babel and BGP should remain loop-free whatever you do.  However, when
> you redistribute routes between protocols, there's no guarantee that the
> union of the two graphs remains loop-free.
> 
> So if you're not careful you could end up in a situation where Babel
> maintains a loop-free forwarding graph, BGP maintains a loop-free
> forwarding graph, but there exists a loop that goes Babel -> BGP -> Babel.
> 
> -- Juliusz

We almost experienced such a situation as well. Bird
always prefers Babel over BGP, unfortunately.

> 
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-- 
Marek Küthe
m.k at mk16.de
er/ihm he/him
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