Configure OSPF as follows; do not create any nonspecified OSPF areas:
■ Configure the OSPF backbone over the Frame Relay network between Routers R2, R4, and R7.
■ The ISDN link between R1 and R4 resides in the area 0.0.0.0.
Basic ISDN Configuration (0.5 Hour) 649
■ The Ethernet segment between R1 and R2 resides in area 1.
■ The Ethernet segment on R4 resides in area 0.0.0.40.
■ Make sure all OSPF routes are redistributed and reachable in the IS-IS, RIP, and EIGRP domains.
■ Ensure that the OSPF backbone in the Frame Relay cloud is authenticated.
■ Ensure that R1 is never the designated router (DR) on all segments.
■ Make sure R4 is the DR in the OSPF backbone network.
■ 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 R4 to 25 seconds.
■ Set the hello interval on the R2 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.
■ Make sure area 0.0.0.40 is configured so that excessive CPU resources are not consumed on Router R4. You can assume that no other areas or routers are attached to this segment.
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