nanog mailing list archives

Re: Comcast route server not reflecting their reality


From: Ross Tajvar <ross () tajvar io>
Date: Wed, 11 Sep 2019 13:05:11 -0400


IIRC, Comcast uses "local-as 7922" path rewriting for all enterprise EDI
customers
running BGP off of regional CRANs, unless I'm mistaken.  So if your
regional CRAN
is as7015 (for New England), even if your physical circuit and BGP session
land
on a local SUR in your area, you have to use remote-as 7922 to setup the
session
with Comcast ENS, regardless of the fact that actual peer's router is
using as7015.


This totally makes sense, thanks for the explanation!

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