We need a better understanding of the topology of this network, especially we need to understand more about the topology of area 0. It is quite possible for a router in area 1 to connect to 2 routers in area 0. We do that all the time and call it redundancy and consider it a good thing. And it is not necessarily required for the 2 area 0 routers to be connected to each other. What is required, as Paul indicates, is that area 0 is contiguous. This means that the 2 area 0 routers have a way to communicate that goes through area 0. For example if there is a third router in area 0 and that third router connects to both of the 2 area 0 routers then things are good. But if the network is really literally as the original poster describes it
area 0 <--> area 1 <--> area 0
then Paul is correct that this is a discontiguous backbone and would be a broken implementation of OSPF.
Note that saying that it is a broken implementation does not mean that if you try to configure it that you would get error messages. You could configure it and the routers would accept the configuration. But you would find unexpected behaviors.
HTH
Rick
HTH
Rick
