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List:       bird-users
Subject:    Re: Best route selection
From:       Olivier Benghozi <olivier.benghozi () wifirst ! fr>
Date:       2014-11-04 0:50:13
Message-ID: 6F963424-5BBC-4DA8-8853-7CE5305E07F4 () wifirst ! fr
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> Le 3 nov. 2014 à 17:13, Ondrej Zajicek <santiago@crfreenet.org> a écrit :
> On Mon, Nov 03, 2014 at 04:42:55PM +0100, Olivier Benghozi wrote:
> > Firstly, in classical BGP implementations (but not in BIRD), for eBGP \
> > connections, router-id is never used as tie-break. Instead, route age is used \
> > (the oldest one wins) as tie-break. It avoids frequent route changes and probably \
> > improves a little routes distribution. You'd better use "prefer older on".
> > 
> > Secondly, a radical solution is (for incoming prefixes):
> > - upstream 1: match net ~ 0.0.0.0/1 and set MED at 1, set MED at 0 for everything \
> >                 else;
> > - upstream 2: match net ~ 128.0.0.0/1 and set MED at 1, set MED at 0 for \
> > everything else.
> 
> Note that you should use 'med metric' option in this case (if your
> uplinks are from different ASes).

That's right, forgot to specify that, I always use deterministic and always compare \
med (med metric on, for BIRD) features on my networks :)


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