On Wed, 5 Oct 2005, Matthew Crocker wrote: > > I'm curious where in your contract you think Cogent guaranteed you > > connectivity to Level 3? > > My original contract was with NTT/Verio which Cogent purchased last year when > Verio nuked their Boston POP. I'm having the contract dug out of the > archives to look at what it says. IMHO I pay Cogent for Transit to the whole > Internet, If I wanted partial transit or local peering I would order/contract > and pay for that. Cogent is not currently providing me full transit service. > I really don't care who pulled the plug, it is Cogents job to fix it for me as > I am their customer.
"Isn't BGP supposed to work around this sort of thing?" This comes down to a little more than just "depeering" -- at least in the BGP sense. There's active route filtering going on as well if connectivity is dead; after all, I can bet the house that at least one of Cogent's network edge peers has connectivity to Level3, and vice versa. >From where I sit, I can see a plethora of routes that transit more than one tier1. And a few that transit three before hitting the origin. From a couple locations I see 3356 and 174 visible in *all* paths to the prefixes containing Level3 and Cogent in the path, respectively. So perhaps the question you should be asking is: Why didn't routes for these networks fall over to the other upstream peers which *are* capable of moving the packets? Surely MCI, AT&T, Sprint, and others would carry the packets to the right place. I can see the paths right here.... > > Most transit contracts only guarantee packet delivery to the edge of their > > own networks. I'm pretty sure Cogent is doing that. (Hell, they have lots > > of spare capacity now. :) > > Most also have a clause to cover the inter-AS links, making sure that they are > not overloaded. What nature of clause? I consider deliberately filtering prefixes or origin ASs to be a violation of common backbone BGP use. Too bad there aren't Equal Access laws for tier1s. <slyly evil grin> -- -- Todd Vierling <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> <[EMAIL PROTECTED]>