[166378] in North American Network Operators' Group
Re: Fundamental questions of backbone design
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Sun Oct 20 10:56:31 2013
To: Matthew Petach <mpetach@netflight.com>
In-Reply-To: Your message of "Sat, 19 Oct 2013 12:43:49 -0700."
<CAEmG1=qT8dGqqD84gAwOvvbzTW+AgiK36CFdUw=EPMQ_rzO4mg@mail.gmail.com>
From: Valdis.Kletnieks@vt.edu
Date: Sun, 20 Oct 2013 10:55:43 -0400
Cc: NANOG Mailing List <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Sat, 19 Oct 2013 12:43:49 -0700, Matthew Petach said:
> Think about it; if network A prepends 10x to network B, and not at all to
> network C; but network B is a free peer of mine, and network C is a transit
> network I pay money to; following the typical convention of "routes learned
> from network B get localpref'd to 5000, routes learned from transit are
> localpref'd at 1000", you'd end up pushing the traffic along the 10x prepended
> pathway.
Thanks. Due to the way our private peering works, the only routes we learn
from our "network B"'s are ones that wouldn't prepend because they want to talk
to us over the peer. So all our prepends show up via our C's. And I was
insuffiently caffienated to consider the case that we'd see prepends on our B
side...
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