[174815] in North American Network Operators' Group
Re: cogent update suppression, and routing loops
daemon@ATHENA.MIT.EDU (ryanL)
Thu Oct 2 12:41:33 2014
X-Original-To: nanog@nanog.org
In-Reply-To: <542D7860.7060701@winterei.se>
Date: Thu, 2 Oct 2014 09:41:25 -0700
From: ryanL <ryan.landry@gmail.com>
To: "Paul S." <contact@winterei.se>
Cc: North American Network Operators Group <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
as stated, yep. i was on the phone with them for over three hours yesterday=
.
On Thu, Oct 2, 2014 at 9:08 AM, Paul S. <contact@winterei.se> wrote:
> First time I'm seeing it, and I've been a Cogent client for quite a while=
.
>
> Have you tried getting in touch with their NOC yet? They're one of the
> most responsive in the industry.
>
>
> On 10/3/2014 =E5=8D=88=E5=89=8D 01:03, ryanL wrote:
>
>> hi. relatively new cogent customer. is what i've stated in my subject li=
ne
>> 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 propagat=
e
>> even on their own looking-glasses.
>>
>> thx
>>
>> ryan
>>
>
>
