Chapter 8

1	The OSPF configurations are RTA: router ospf 1 network 10.0.0.0 0.0.255.255 area 0 RTB: router ospf 1 network 10.0.0.0 0.0.255.255 area 0 network 10.5.0.0 0.0.255.255 area 5 area 5 virtual-link 10.100.100.9 RTC: router ospf 1 network 10.0.0.0 0.0.255.255 area 0 network 10.10.0.0 0.0.255.255 area 10 network 10.30.0.0 0.0.255.255 area 30 RTD: router ospf 1 network 10.0.0.0 0.0.255.255 area 0 network 10.20.0.0 0.0.255.255 area 20 RTE: router ospf 1 network 10.0.0.0 0.0.255.255 area 0 network 10.15.0.0 0.0.255.255 area 15 RTF: router ospf 1 network 10.5.0.0 0.0.255.255 area 5 RTG: router ospf 1 network 10.10.1.58 0.0.0.0 area 10 RTH: router ospf 1 network 10.20.100.100 0.0.0.0 area 20 network 10.20.1.0 0.0.0.255 area 20 RTI: router ospf 1 network 10.5.0.0 0.0.255.255 area 5 network 10.35.0.0 0.0.255.255 area 35 area 5 virtual-link 10.100.100.2 RTJ: router ospf 1 network 10.15.0.0 0.0.255.255 area 15 RTK through RTN have Frame Relay interfaces. The four interfaces to the Frame Relay network are all on the same subnet, so the OSPF network type must be either broadcast or point-to-multipoint: RTK: interface Serial0 encapsulation frame-relay ip address 10.30.254.193 255.255.255.192 ip ospf network point-to-multipoint ! router ospf 1 network 10.30.0.0 0.0.255.255 area 30 RTL: encapsulation frame-relay ip address 10.30.254.194 255.255.255.192 ip ospf network point-to-multipoint ! router ospf 1 network 10.30.0.0 0.0.255.255 area 30 RTM: encapsulation frame-relay ip address 10.30.254.195 255.255.255.192 ip ospf network point-to-multipoint ! router ospf 1 network 10.30.0.0 0.0.255.255 area 30 RTN: encapsulation frame-relay ip address 10.30.254.196 255.255.255.192 ip ospf network point-to-multipoint ! router ospf 1 network 10.30.0.0 0.0.255.255 area 30
2	The ABR configurations are RTB: router ospf 1 network 10.0.0.0 0.0.255.255 area 0 network 10.5.0.0 0.0.255.255 area 5 area 5 virtual-link 10.100.100.9 area 0 range 10.0.0.0 255.255.0.0 area 5 range 10.5.0.0 255.255.0.0 RTC: router ospf 1 network 10.0.0.0 0.0.255.255 area 0 network 10.10.0.0 0.0.255.255 area 10 network 10.30.0.0 0.0.255.255 area 30 area 0 range 10.0.0.0 255.255.0.0 area 10 range 10.10.0.0 255.255.0.0 area 30 range 10.30.0.0 255.255.0.0 RTD: router ospf 1 network 10.0.0.0 0.0.255.255 area 0 network 10.20.0.0 0.0.255.255 area 20 area 0 range 10.0.0.0 255.255.0.0 area 20 range 10.20.0.0 255.255.0.0 RTE: router ospf 1 network 10.0.0.0 0.0.255.255 area 0 network 10.15.0.0 0.0.255.255 area 15 area 0 range 10.0.0.0 255.255.0.0 area 15 range 10.15.0.0 255.255.0.0 RTI: router ospf 1 network 10.5.0.0 0.0.255.255 area 5 network 10.35.0.0 0.0.255.255 area 35 area 5 virtual-link 10.100.100.2 area 0 range 10.0.0.0 255.255.0.0 area 5 range 10.5.0.0 255.255.0.0 area 35 range 10.35.0.0 255.255.0.0
3	The configurations are RTE: router ospf 1 network 10.0.0.0 0.0.255.255 area 0 network 10.15.0.0 0.0.255.255 area 15 area 15 stub RTJ: router ospf 1 network 10.15.0.0 0.0.255.255 area 15 area 15 stub
4	The configurations are RTC: router ospf 1 network 10.0.0.0 0.0.255.255 area 0 network 10.10.0.0 0.0.255.255 area 10 network 10.30.0.0 0.0.255.255 area 30 area 0 range 10.0.0.0 255.255.0.0 area 10 range 10.10.0.0 255.255.0.0 area 30 stub no-summary area 30 range 10.30.0.0 255.255.0.0 RTK: router ospf 1 network 10.30.0.0 0.0.255.255 area 30 area 30 stub RTL: router ospf 1 network 10.30.0.0 0.0.255.255 area 30 area 30 stub RTM: router ospf 1 network 10.30.0.0 0.0.255.255 area 30 area 30 stub RTN: router ospf 1 network 10.30.0.0 0.0.255.255 area 30 area 30 stub
5	The configurations are RTD: router ospf 1 network 10.0.0.0 0.0.255.255 area 0 network 10.20.0.0 0.0.255.255 area 20 area 20 nssa RTH: router ospf 1 network 10.20.100.100 0.0.0.0 area 20 area 20 nssa
6	Only one end of a point-to-point circuit needs to be configured as a demand circuit. In this solution, RTC is chosen: interface Serial0 ip address 10.30.255.249 255.255.255.252 ip ospf demand-circuit ! router ospf 1 network 10.0.0.0 0.0.255.255 area 0 network 10.10.0.0 0.0.255.255 area 10 network 10.30.0.0 0.0.255.255 area 30 area 0 range 10.0.0.0 255.255.0.0 area 10 range 10.10.0.0 255.255.0.0 area 30 range 10.30.0.0 255.255.0.0