We could use a few type of frame-relay network (NBMA or point-to-multipoint). Let's go with point-to-multipoint, it's like a collection of point-to-point network from each sites. This is not going to be a Hub and Spokes network because each site have it's own DLCI to others. So it's a full mesh network.
Add below command on all WAN interfaces to make a point-to-multipoint Frame-relay network.
ip ospf network point-to-multipoint
configure OSPF area 0 for the WAN interfaces and Loopbacks, do the same for the rest of the Net
router ospf 1
network 10.9.9.1 0.0.0.0 area 0
network 126.96.36.199 0.0.0.0 area 0
make sure neighbor are formed between the three WAN routers. below are a few useful command to get some information and troubleshoot.
show ip route
show ip route ospf
sh ip ospf interface serial 0/1
show ip protocols
show ip ospf
show ip ospf neighbor
next we will configure routing on the LAN using EIGRP and redistribute it to the OSPF so that the other side of the network can reach it.