Configure OSPF as follows; do not create any nonspecified OSPF areas:
■ Configure the OSPF backbone over the Frame Relay network between Routers R1, R2, and R3.
■ The ISDN link between R2 and R3 resides in the area 0.0.0.0.
■ The link between R1 and R2 resides in area 4 (note that this VLAN also runs EIGRP).
■ The loopbacks on R1, R2, and R3 can reside in the most appropriate area. Do not configure any network in area 0 unless required.
■ Make sure all OSPF routes are redistributed and reachable in the RIPv2 and EIGRP domains.
■ Ensure that the OSPF backbone in the Frame Relay cloud is authenticated.
■ Ensure that R1 or R2 is the designated router (DR) on all segments.
■ Ensure that the router ID of all OSPF-enabled routers is the loopback address.
■ Do not create any additional areas.
■ Set the hello interval between links R1 and R2 to 20 seconds.
■ Set the hello interval on the R3 Ethernet segment to 20 seconds.
■ Ensure that all loopbacks appear as /24-bit networks on all IP routing tables. Do not use the redistribute connected command on any router to accomplish this.
■ Ensure that any rogue devices running multicast OSPF do not impact any router resources.
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