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Redundant Routes, BGP with MPLS provider
From: "Tribble, Wesley" <WTribble () sterneagee com>
Date: Thu, 30 Aug 2012 13:17:55 -0500

Hello all,

I am an Network Operator working in an Enterprise environment with offices all over the country(mostly connected via 
MPLS).  We are currently working towards building a Disaster Recovery Site that will host some of our vendor routers 
and provide the capability to access these vendors from both our primary and backup data center locations.  The 
routes(as advertised by the vendor's routers) will be the same at both locations.  I would like to advertise the routes 
from multiple locations at the same time, rather than suppress the routes and advertise conditionally.

What is the best method to Instruct the provider's network to prefer the Primary Data Center routes over the DR site?  
Keep in mind that I am only peering with the provider over BGP and I have no visibility to the underlying MPLS 
architecture or configuration.  Although if you have specific questions  about their architecture, I can work to get 
answers.

Discussing in house, we have gone over a few different options:

-Advertise specific routes from primary site and summary routes from the DR site.  Most specific will always be chosen.
-Prepend the routes from the DR site so that they will have a longer AS-path than the Primary location
-Use Community Strings to influence local preference.(Still working to find out if Provider will pass our community 
strings)

Just looking for some ideas and best practices.  Any thoughts or insight would be much welcomed and appreciated.  This 
is my first message on NANOG, so please be gentle.  I apologize in advance if I have done something incorrectly.


Wes


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