Here is my network, I'm hoping the diagram makes sense. I'm trying to figure out what routing protocol to use in the red circle. I have a couple of choices here:
Option 1 - On the internet firewall, use OSPF Process 1 Area 0, which means that the internet routers will receive the 10.1.0.0/24 , 10.2.0.0/24 and 10.3.0.0/24 networks. I don't think this is a big issue though right?
Option 2 - On the internet firewall, use OSPF Process 1 Area 1, which means I can filter the 10.X.X.X routes between areas. More secure, but much more complex.
Option 3 - On the internet firewall, use OSPF Process 2 Area 0, which means I can filter the 10.X.X.X routes between areas. More secure, but much more complex.
Option 4 - Use iBGP or eBGP between the internet firewall and the routers. This seems dirty and complex.
Thoughts? What would you use and why? Something I'm missing?
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