Cogent revisited

Mon Aug 17 13:02:13 UTC 2015

There is also the problem with multi-homed customers where Cogent is in the mix. The dropped packets at Cogent's peering points to eyeball networks break certain protocols that are packet loss sensitive (VoIP, IPSEC, etc...).

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-----Original Message-----
From: NANOG [mailto:nanog-bounces at nanog.org] On Behalf Of Justin M. Streiner
Sent: Sunday, August 16, 2015 11:27 PM
To: nanog at nanog.org
Subject: Re: Cogent revisited

On Wed, 12 Aug 2015, James Bensley wrote:

> Perhaps that depends on were are you in the world and your traffic types.
>
> I have worked with two UK ISPs that have Cogent as one of their
> transit providers, neither have had any problems in the 5+ years
> they've both had the Cogent transit, it has always "just worked".

And for the most part, that will be the case.  If you're multi-homed, it's 
really not a major issue.  It's more when someone is:
1. single-homed to Cogent and they get into a peering/transit/pay-us spat 
with one of the DFZ carriers, and Cogent gets de-peered. Single-homed 
customers of $de-peering_carrier disappear from your view of the Internet.
2. single-homed to one of said DFZ carriers and a peering/transit/pay-us 
spat arises with Cogent, and Cogent gets de-peered.  Single-homed customers
of Cogent's disappear from your view of the Internet.

jms