[101005] in North American Network Operators' Group
Re: Re: Connections among ASes
daemon@ATHENA.MIT.EDU (Chengchen Hu)
Thu Nov 29 23:12:17 2007
Date: Thu, 29 Nov 2007 22:11:01 -0600
From: "Chengchen Hu" <huc@ieee.org>
To: "nanog" <nanog@merit.edu>
Errors-To: owner-nanog@merit.edu
Thanks.
Although they are not absolute cases, are they "typical" cases, i.e., do
they apply to most of the cases? I know "typical" is not well defined, but
I am kind of curious about the likelihood of the happening.
A related question. Is there any sources I can look more about such
issues?
Chengchen
2007-11-29
-------------------------------------------------------------
From: Randy Bush
Data: 2007-11-29 19:24:12
To: Chengchen Hu
CC: nanog
Subject: Re: Connections among ASes
> 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
