[169601] in North American Network Operators' Group
Re: valley free routing?
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Wed Mar 5 16:01:47 2014
To: William Herrin <bill@herrin.us>
In-Reply-To: Your message of "Wed, 05 Mar 2014 15:23:55 -0500."
<CAP-guGWyjkuXpzbe0BuaC1iZv_kRaMxQLkLg9gHz=+7MhVvO+g@mail.gmail.com>
From: Valdis.Kletnieks@vt.edu
Date: Wed, 05 Mar 2014 16:00:44 -0500
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Wed, 05 Mar 2014 15:23:55 -0500, William Herrin said:
> Hi folks,
>
> Can anyone tell me about a situation in which a route which was not
> valley free was not a result of a misconfiguration or a bad actor? For
> those who don't recall the terminology, a network path is valley free
> if it crosses exactly zero or one free peering links when traveling
> between the two endpoints.
Assume 3 providers A B and C, where you have a single-homed customer on A and a
single-homed customer on C, and A and C don't peer. Traffic may end up going
thorugh an A-B peering and a B-C peering. And whether A-B and B-C are a free
peering or a paid transit is a business deal, outside the scope of BGP, unless
you want to abuse communities...
Are A and/or C "bad actors" for not peering? Jury is still out on that one.
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