Level3 (3356/3549) changes routing policy

Thu Aug 2 13:53:38 UTC 2012

Thanks David, you hit the nail on the head on both points. 

Level 3 made the routing policy change last November, roughly 6 weeks after the acquisition of Global Crossing.

Dave

-----Original Message-----
From: David Reader [mailto:david.reader at zeninternet.co.uk] 
Sent: Thursday, August 02, 2012 6:41 AM
To: nanog at nanog.org
Subject: Re: Level3 (3356/3549) changes routing policy

On Thu, 2 Aug 2012 10:33:38 +0200
Fredy Kuenzler <kuenzler at init7.net> wrote:

>  From my observation Level3 has recently changed their routing policy. 
> It seems that 3356 always prefers customer prefixes of 3549, 
> regardless of the AS path length. Example (seen from 3356):
> 
> 3549_13030_[Customer1]_[Customer2]
> 
> is preferred over
> 
> 2914_[Customer1]_[Customer2]
> 
> Considering that both 2914 and 3549 are peers of 3356, and 13030 is a 
> customer of 3549, 3356 seems to give higher local-pref on the longer 
> AS-path, likely to increase traffic and revenue of their sister network 3549.

Hi Fredy,

Level 3 owns both 3356 and 3549.
They're simply preferring to have their customers pay them, rather than a 3rd party.

I don't think it's suprising at all that they're doing it. If, as you think, it's only happened recently then what is suprising is that it didn't happen sooner IMO.

d.