A single LAN with several switches and computers exist within a single VLAN behind each router. There are no more routers behind the ones describe on the image. OSPF Area 0 already exists. Router CBA already exists with static routes. LM and RH are new routers (sites) added to the network. IG site holds the main computer center. Router RH will provide communications for RH site computers and will become a disaster recovery site with a replica of servers from IG. Router LM will provide communications for LM site computers and a redundant link for RH and IG.
I need to add LM, RH and CBA to the OSPF "cloud"
What will be the advantage if I define OSPF Area X as part of area 0? Is it better to define Area X with a different area number? Why? How should I add CBA to the OSPF cloud? As part of area 0? as a separate area? as part of area X? If Area X is define as a different area, Will there be any advantage if Area X is define as a stub area? Why? Do you have any other recommendations before adding those routers to the OSPF domain?