[100999] in North American Network Operators' Group
Re: Connections among ASes
daemon@ATHENA.MIT.EDU (Randy Bush)
Thu Nov 29 20:22:53 2007
Date: Thu, 29 Nov 2007 17:19:03 -0800
From: Randy Bush <randy@psg.com>
To: Chengchen Hu <huc@ieee.org>
CC: nanog <nanog@merit.edu>
In-Reply-To: <200711291909204469680@ieee.org>
Errors-To: owner-nanog@merit.edu
> 1) there is no such a direct link between two routers located in two
> Internet eXchange Points-IXPs (even in same city) if they are from
> different ASes. For example, a router A belongs to AS x located in
> IXP1, and router B belongs to AS y located in IXP2, there is no link
> between A and B.
it is not safe to assume that routers A & B, each belonging to a
different isp and each in a different colo in the same city are not
otherwise interconnected.
> 2) small AS will not use one router to connect to 2 different
> providers in differnet IXPs. It is much cheaper using one router to
> connect with different ASes in a same IXP.
what if the two providers to which i want to connect are not at the same
ix but i can get a cheap L2 transport to the second ix?
randy
