Is the export policy selective under valley-free?

Paul Wall pauldotwall at gmail.com
Tue Sep 2 19:23:43 CDT 2008


Kai,

That's correct.  A network purchasing transit will advertise its
internally-originated prefixes, as well as those it's learning from
downstream customers, to its provider.

(At least that's the theory.  It's not terribly uncommon for transit
purchasers to advertise a full table, or for their providers to have
lax or non-existent filters, but that's neither here nor there. :)

I'm not sure what "valley-free" means in this context.  You might want
to try the Rosetta Stone patches and make sure your copy is up to
date.

Drive Slow,
Paul Wall
http://www.linkedin.com/in/paulwall

On Tue, Sep 2, 2008 at 7:45 PM, Kai Chen <kch670 at eecs.northwestern.edu> wrote:
> Just want to ask a direct question. Will an AS export all it gets from
> its customers and itself to its providers? Or even under valley-free,
> the BGP export policy is also selective?
>
> Thanks a lot,
> --
> -Kai
>
>




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