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:[email protected]] Sent: Thursday, August 02, 2012 6:41 AM To: [email protected] Subject: Re: Level3 (3356/3549) changes routing policy On Thu, 2 Aug 2012 10:33:38 +0200 Fredy Kuenzler <[email protected]> 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.
