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@zeninternet.co.uk] Sent: Thursday, August 02, 2012 6:41 AM To: nanog@nanog.org Subject: Re: Level3 (3356/3549) changes routing policy On Thu, 2 Aug 2012 10:33:38 +0200 Fredy Kuenzler <kuenzler@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.