Design recommendations for Dual BGP MPLS network

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I am trying to come up with a way to properly implement a dual MPLS to the branch network. I would like to use both networks simultaneously. Most of my traffic goes from the head ends to the branches.


Most branches have 2 networks. A voice network and a data network. What I am thinking of doing is advertising 1 network to each MPLS cloud and conditionally advertising the other network in the case of a network outage. This should allow me to utilized both networks.


Does this seem like a good idea? Would enhanced object tracking be a better way of doing that? Can you use EOT with BGP advertisements? Can anyone think of a better way to utilize both networks at the same time?


Attached is a basic diagram.



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carenas123 Tue, 07/03/2007 - 10:13
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One advantage of dual MPLS networks vs. using an Internet option is the ability to retain end-to-end, bi-directional QoS (quality of service) markings and support. This may be difficult or impossible to achieve across random topology. Another advantage of a dual MPLS network is the need to support modern streaming and voice applications.

jkillion Tue, 07/03/2007 - 11:26
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Rather than a conditional advertisement, I would use AS prepending. Have one router advertise the data subnet w/ no prepends and the other router advertises it with 5 (and vice versa for the voice). You could also use MED if you are peering with the same provider to achieve similar results.

quistn Tue, 07/24/2007 - 05:47
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advertise both subnets out across both carriers using eBGP. Redistribute eBGP into your IGP (i use EIGRP) on your WAN edge.

out of your head-end, advertise only your needed network (I simply need to advertise a 0.0.0.0 out of the head-end for my remote locations).

Hopefully you have a L3 LAN presence; if so, you now have two equal cost paths for both subnets.


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