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Re: Level3 (3356/3549) changes routing policy
From: David Reader <david.reader () zeninternet co uk>
Date: Thu, 2 Aug 2012 13:41:29 +0100

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.


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