To set the record straight, no peering agreements were violated between L3 and Cogent. There is also no confirmed evidence that L3 is blocking Cogent traffic through Cogent's Verio transit (which Cogent pays $$ for.) It appears that Cogent is unwilling to use this route because it would force them to pay (Verio) per Mb/s for the information sent to/from L3's network. The de-peering was consistent with the peering agreement between L3 and Cogent according to http://status.cogentco.com/
Current NANOG consensus (whatever that's worth) is that both companies are equally responsible for correcting their reachability issues, but L3 initiated the de-peering process. Peering (or Settlement Free Interconnection, SFI) is an extremely complicated subject often involving millions of dollars to the carriers involved. The current NANOG thread on the subject contains a great deal of information (and mis-information) and is a good read for those interested in the subject. I tend to weight the arguments made by Patrick, Leo, Randy, Vijay, and Richard higher than most others. Best, Tony On 10/6/2005 11:16 AM, Tom DeReggi created: > For those that are not aware, Level-3 vilolated its inplace agreements, > and blocked all peering connections from Cogent communications yesterday > (October 5th), and rumor has it that they are also now blocking all > Cogent assigned IP ranges, so that routing diverse paths won't be > effective. Not much I can say about peering disputes, but blocking IPs > without cause (meaning violation of AUP) is crossing the line, and > clearly anti-competitive and a law sute soon to happen. > > Level3 VOIP provider just lost our business over this one. Can't risk > using a provider that demonstrates such practices. > > If using Level3 for servers, call to complain, because otherwise you are > going to have lots of unsatisfied customers that can't get to the > servers that reside on the Cogent network. Level 3 is doing the blocking. > > For those of you using Level3 and looking to become multi-homed, nows > the chance to save. Cogent is offering FREE one years transit service > at the same capacity as the level 3 connection. > > Tom DeReggi > RapidDSL & Wireless, Inc > IntAirNet- Fixed Wireless Broadband > > > -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/