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Re: using IRR tools for BGP route filtering
From: <dhudes () hudes org>
Date: Mon, 19 Jun 2000 18:18:47 -0400 (EDT)

Communities. Ask sprint (or look in the IRR) about the communities they
have configured in their announcements.
At least they probably have
*backbone -- their own network

a transit customer, such as you, would get all 3. A peer would get the 1st
two. You configure the local-pref for the sprint customer community to go
to sprint. Ditto for BBN if you have their service.

On Mon, 19 Jun 2000, Peter Francis wrote:

My mistake in the original post.

I am looking for the list of (for instance) customers of Sprint that are purely "downstream" of Sprint.

Now that I think about there may not be any easy way to distinguish between a small ISP that is multi-homed to Sprint 
and some other provider (their traffic I would want to send to Sprint) and BBN (who also appear to be one AS hop 
behind Sprint from my networks perspective and whose traffic I do not want to send to Sprint.)

I know I can come up with a list of "major" backbone AS's and filter their traffic off by hand but I was looking for 
a "cleaner" solution by using the IRR.

I hope that clarifies what I am trying to accomplish.


At 2:35 PM -0700 6/19/00, Joe Rhett wrote:
How would one extract the following information from the IRR:

the list of AS's which are non-transit customers of a given backbone provider

Wish upon a star?

If they are non-transit customers, then their networks won't be announced
outside of that provider's own network. So unless you can access that
provider's own BGP tables directly you can't know this information.

Joe Rhett                                         Chief Technology Officer
JRhett () ISite Net                                      ISite Services, Inc.

PGP keys and contact information:          http://www.noc.isite.net/Staff/

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