BGP multihoming with two address spaces

Wed Jan 29 14:20:32 UTC 2014

Perhaps L3 is preferring the routes it hears from TW over the ones it hears
from you. Perhaps there is a community string you can attach to your
announcements to one or both providers which can help you further manipulate
what they do with your routes ...

-----Original Message-----
From: Joseph Jenkins [mailto:joe at breathe-underwater.com] 
Sent: Wednesday, January 29, 2014 7:45 AM
Cc: nanog at nanog.org
Subject: Re: BGP multihoming with two address spaces

I am announcing two separate /24s.  8.37.93.0 and 207.114.212.0.

Joe

On Jan 29, 2014, at 4:21 AM, Sasa Ristic <ristic.sasa at gmail.com> wrote:

> How are you announcing your address space now?
> 
> On Wed, Jan 29, 2014 at 12:32 PM, Joseph Jenkins 
> <joe at breathe-underwater.com> wrote:
>> I am seeking some feedback/help with my BGP configuration.  I am peering
with two providers level3 and tw.  Unfortunately all of my address spaces
are preferring the route over tw rather than level3.  I have tried
Prepending my AS and the carriers AS to the path on the tw side and I see
those update being accepted by internet routers, but everyone is still
preferring to install the tw routes rather than level3.  I was trying to
advertise each provider's address space out their connections and then use
the other for backup.  Now however everything is coming in through tw and no
one seems to like level3.
>> 
>> 
>> Thanks in advance for any guidance or assistance.
>> 
>> Joe
>> 
> 
> 
> 
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> Ristic Sasa
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