Level3 (3356/3549) changes routing policy

Siegel, David Dave.Siegel at level3.com
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.


-----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.


More information about the NANOG mailing list