local_preference for transit traffic?

Keegan Holley keegan.holley at sungard.com
Thu Dec 15 07:24:13 UTC 2011

 I always assumed that taking in more traffic was a bad thing.  I've heard
about one sided peering agreements where one side is sending more traffic
than the other needs them to transport. Am I missing something?  Would this
cause a shift in their favor allowing them to offload more customer traffic
to their peers without complaint?

2011/12/15 Jeff Wheeler <jsw at inconcepts.biz>

> On Thu, Dec 15, 2011 at 1:07 AM, Keegan Holley
> <keegan.holley at sungard.com> wrote:
> > Had in interesting conversation with a transit AS on behalf of a customer
> > where I found out they are using communities to raise the local
> preference
> That sounds like a disreputable practice.
> While not quite as obvious, some large transit ASes, like Level3,
> reset the origin to I (best) sometime between when they learn it and
> when they announce it to their customers and peers.  This similarly
> causes them to suck in a bit more traffic than they might otherwise.
> --
> Jeff S Wheeler <jsw at inconcepts.biz>
> Sr Network Operator  /  Innovative Network Concepts

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