Wednesday, April 25, 2018

Multi-homed routes took a new path to Level3 yesterday, preferring Century Link now.

We are multi-homed to Century Link and Cogent, both sides are burstable to 10GB, typically we would see a daily peak of about 1GB on Century Link and 1.7GB on Cogent. Currently billed at a base of 1GB on CL and 2GB on Cogent, so that has actually worked out very well for us as far as not seeing overage charges etc.

Yesterday, something change.

Cogent was essentially carrying all of our Level3 traffic and CL was carrying a significant portion of everything else, as of 4:15 UTC yesterday AS209 took over as path to all AS3356 (Level3). Using the Level3 looking glass, AS174 doesn't even appear as an available path anymore. We are now seeing about 2GB on CL and 800MB on Cogent, so we are going to get hammered in overages from CL every month unless this changes back.

Not sure if this is related to the CL/LVL3 merger or if there is a peering issue with Cogent/LVL3 (which would not surprise).

We are connected to POPs in Pittsburgh. Not really looking for anything specifically here, just a bit of a gripe, although I would love to hear any thoughts if anybody knows why this happened or any information about the situation. Going to have to explain to management why our Internet costs just went up $20k/year if this maintains.

Edit - We are in Western PA and we connect to POPs in Pittsburgh for both CL and Cogent.



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