nanog mailing list archives
RE: valley free routing?
From: "Siegel, David" <David.Siegel () Level3 com>
Date: Wed, 5 Mar 2014 21:48:26 +0000
I can't think of any circumstances where the business "B" would be content transit traffic between A and C without some form of compensation. That compensation may not involve payment for bits, however. In theory, the compensation might be derived from something occurring at the application layer, but even in those cases that business relationship is probably not apparent from looking at prefix advertisements. Business B is probably using b2b user agents, gre encap or some other method that makes both legs look like independent IP flows to network A and B. Interesting question, though. Dave -----Original Message----- From: William Herrin [mailto:bill () herrin us] Sent: Wednesday, March 05, 2014 2:08 PM To: Valdis Kletnieks Cc: nanog () nanog org Subject: Re: valley free routing? On Wed, Mar 5, 2014 at 4:00 PM, <Valdis.Kletnieks () vt edu> wrote:
On Wed, 05 Mar 2014 15:23:55 -0500, William Herrin said: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.
Hi Valdis, It's that business deal I want to hear about. When A-B and B-C are free peering but the traffic goes A-B-C for some reason other than a misconfiguration or deliberate abuse. On or off list, I'd like to know about real-life use cases where folks do this on purpose. Regards, Bill Herrin -- William D. Herrin ................ herrin () dirtside com bill () herrin us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004
Current thread:
- valley free routing? William Herrin (Mar 05)
- Re: valley free routing? Valdis . Kletnieks (Mar 05)
- Re: valley free routing? William Herrin (Mar 05)
- RE: valley free routing? Siegel, David (Mar 05)
- Re: valley free routing? Blake Dunlap (Mar 05)
- Re: valley free routing? Valdis . Kletnieks (Mar 05)
- Re: valley free routing? JÁKÓ András (Mar 06)
- Re: valley free routing? William Herrin (Mar 05)
- Re: valley free routing? Valdis . Kletnieks (Mar 05)
- Re: valley free routing? Joel Maslak (Mar 05)
- Re: valley free routing? Iljitsch van Beijnum (Mar 06)
- Re: valley free routing? Randy Bush (Mar 06)
- RE: valley free routing? Siegel, David (Mar 07)
- Re: valley free routing? William Herrin (Mar 07)
- Re: valley free routing? Randy Bush (Mar 07)
- Re: valley free routing? William Herrin (Mar 07)
- RE: valley free routing? Siegel, David (Mar 07)