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Re: Cogent/Level 3 depeering

  • From: Micheal Patterson
  • Date: Wed Oct 05 16:59:28 2005

----- Original Message ----- From: "Daniel Roesen" <[email protected]>
To: <[email protected]>
Sent: Wednesday, October 05, 2005 2:11 PM
Subject: Re: Cogent/Level 3 depeering

On Wed, Oct 05, 2005 at 02:08:01PM -0400, Richard A Steenbergen wrote:
You can only be a "tier 1" and maintain global reachability if you peer
with every other tier 1. Level 3 is obviously the real thing, and Cogent
is "close enough" (at least in their own minds :P) that they won't buy
real transit, only spot routes for the few things that they are missing
(ATDN and Sprint basically). There is no route "filtering" going on, only
the lack of full propagation due to transit purchasing decisions, or in
this case the lack thereof.
Exactly. And this is why Cogent's statement to the public (and their
customers) is an outright lie. Level 3 isn't "denying Level 3's
customers access to Cogent's customers and denying Cogent's customers
access to Level 3 customers.". It's just that they deny Cogent
settlement-free direct peering anymore. Cogent can get the L3 and L3
customer routes elsewhere if they want. But Cogent doesn't. It's Cogents
decision to break connectivity, not L3's.

If I would be a Cogent customer, I would have a _very_ warm word with my
sales rep why they are trying to bs me with those kind of statements and
think that I actually am dumb enough to believe that.

Some would argue about Cogent being a tier 1 carrier. I honestly don't know anymore. All I do know, is that when I was still provisioning circuits within PSINet years ago, PSINet was on the verge of being a tier 1 as they had bilateral peering with the majority of the other tier 1 carriers at the time. Now, when Cogent took over the PSINet fiber backbone, I've no idea if they kept those peering points hot or not. If they did, then they should have plenty of pathing to L3 even with the direct peer being down. As you also said, I would think that if that traffic isn't getting through from Cogent's net to L3, there's an issue with Cogent's routing of that traffic unless L3 has placed a direct acl prohibiting any Cogent IP space from entering their network. That's a big if though simply because of the amount of traffic that will get just blown away by doing that.


Micheal Patterson
Senior Communications Systems Engineer

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