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Re: Level 3's side of the story

  • From: Richard A Steenbergen
  • Date: Sat Oct 08 17:06:34 2005

On Sat, Oct 08, 2005 at 04:37:29PM -0400, Patrick W. Gilmore wrote:
> You mention at least twice (here and in the FT depeering paragraph)  
> that Cogent "accepts" the routes.
> It is entirely possible, and in fact likely IMHO, that the prefixes  
> were never offered by Verio to Cogent.  Cogent pays Verio for partial  
> transit, why would Verio give Cogent more ASes than they paid for?   
> If Verio doesn't announce the prefixes, how can Cogent filter them?
> Of course, I do not have enable on Cogent or Verio border routers, so  
> I cannot say for certain.  Would anyone who _knows_ care to enlighten  
> us?

Because FT and Teleglobe are both full transit customers of Sprint, with 
full global routes in, and full propagation out (this is verifiable via 
many looking glasses). You aren't seriously going to claim that Cogent has 
a contract with Verio which says "We will give you partial transit aka 
only Sprint routes, but not Sprint routes to certain Sprint customers like 
FT and Teleglobe", and that Cogent is throwing up its hands and saying 
"sorry our contract doesn't give us routes to you, Verio won't let us 
change it, what are we going to do?" are you?

But while we're on the subject, how do you think Sprint feels about Verio 
selling Cogent "Sprint routes only"? I of course am not privy to exact 
wording of the peering contract between Verio and Sprint (and if I was I 
sure as hell wouldn't be talking about it on NANOG), but on many peering 
agreements there is usually a clause that contains words like "shall not 
give or sell nexthop to others". At the very least, it is down-right 
unfriendly. Verio peers with FT and Teleglobe directly already, which 
means that in order for them to send Cogent those routes via Sprint (which 
Cogent now clearly still uses, 174 2914 1239 5511), they must have Cogent 
directly connected on the same routers as their Sprint interconnections, 
and have a virtual RIB set up, into which they import only the Sprint 
routes. That does raise some interesting questions about how the contract 
is written. But I agree, we're just speculating, and I'm certain no one is 
going to give us an answer publicly.

Richard A Steenbergen <[email protected]>
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)