circling back on this, i guess my case with cogent has been escalated to vp engineering, and i've had a few people reply on and off list citing the same problems. i encourage you to open up cases to help demonstrate further examples (ie: it's not just me!)
thx everyone. ryan On Thu, Oct 2, 2014 at 9:03 AM, ryanL <ryan.lan...@gmail.com> wrote: > hi. relatively new cogent customer. is what i've stated in my subject line > kinda standard fare with them? > > i've discovered that when i advertise a /24 from inside a larger /22 to > XO, (who peers with cogent), and then pull the /24 some time later, that > cogent holds onto the /24 and then bounces packets around in their network > a bunch of times for upwards of 8-10 minutes until they finally yank it. > this effectively blackholes traffic to my /24 for anyone that is using a > path thru cogent. > > example: http://ryry.foursquare.com/image/0e0K1K0t0W2M > > it's been a bit of a frustrating experience talking to their noc to > demonstrate it, but i'm able to duplicate it on demand. even pushing routes > using their communities to offload the circuit takes forever to propagate > even on their own looking-glasses. > > thx > > ryan >