I work for a small company with 8/9 POPs in various locations all connected via Ethernet back to our central locations.
We're at the stage of integrating 2 disparate networks at the moment (one running EIGRP, one OSPF, the greater number of devices on the OSPF network) and as I'm going to have to go through the pain of choosing what to do with the integration, just looking for some advice.
I've heard of people doing this in a number of ways, and am interested in what people are doing in the real world in the way are you running OSPF for connected routes and establishing BGP neighborships based on this? Just running OSPF/your IGP throughout?
We will also be looking to roll out some MPLS features such as TE, L2/L3 VPN's and look to your experiences of the best way to go about the overall network so I don't get 3 months down the line and find an absolute error that I have made which means I have to change everything to something else.
Trying to get a feel for what people are doing in practice.
If you are going to implement MPLS TE there is little choice, as it is only supported with link-state protocols. In your case this means: replace EIGRP with OSPF everywhere you like to have MPLS TE.
Throughout your entire AS try to use only one IGP mainly for your NMS and BGP next hops. Depending on the size you might look into setting up different areas. If possible use only one area, as this again will simplify MPLS TE implementation quite a bit.
All customer routes should be in BGP either for Internet or for MPLS L3VPNs. So the IGP should provide for fast convergence under failure conditions and provide BGP next-hop connectivity.
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