cogent update suppression, and routing loops

Fri Oct 3 18:51:00 UTC 2014

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.landry at 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
>