Hi Guys, I'm currently researching the possibility of the implementation of OSPF in our core network. First, let me share a topology. It basically concerns traffic from the subnets connected to firewall cluster 1 that is going to firewall cluster 2. That traffic passes through the core router. Currently, the core router is configured using static routes. Although that's working fine, we don't want to have this administrative overhead anymore and are therefore considering the implementation of OSPF. Since OSPF uses the concept of areas, the information and discussion I haven't been able to find, is, what would be a good approach to the network design of this OSPF implementation. For example: -> Should we go with one "big" area 0 or should we put the router in area 0, the firewall cluster 1 in area 1 and the firewall cluster 2 in area 2? This part of the network (basically our core) can be considered stable, we will expect low convergence there. The main advantage of multiple areas is that convergence is limited to a single area. -> Since the firewalls have the default gateway pointed at the edge cluster, a stub area cannot be used. I'd love to hear your takes on this.
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