OSPF Lab 9

Tasks:

1. Configure OSPF area 0 on the subnet 111.111.12.0/24, area 12 on the subnet 111.111.0.0/24,area 1 on the subnet 111.111.2.0/24, and area 2 on R1’s loopback interfaces.

2. R2 should not have reachability to R1’s loopback interfaces. Do not use area filter-list command.

3. Configure R1 to advertise a default route to R2

4. Configure the network so that reachability is maintained in the case of the Ethernet link failure between R1 and R2.

5. Configure Type-1 authentication on area 0.

Lab Diagram:

NB: Click here to download the .net file and the initial configuration files.

Solutions:

Task 1:

R1:
router ospf 1
network 111.111.0.1 0.0.0.0 area 12
network 111.111.4.0 0.0.3.255 area 2
network 111.111.12.1 0.0.0.0 area 0

R2:
router ospf 1
network 111.111.0.2 0.0.0.0 area 12
network 111.111.2.2 0.0.0.0 area 1
network 111.111.12.2 0.0.0.0 area 0

Verification:

R1#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
111.111.2.2 1 FULL/BDR 00:00:37 111.111.12.2 FastEthernet0/0
111.111.2.2 1 FULL/BDR 00:00:38 111.111.0.2 FastEthernet0/1

R1#show ip route ospf
111.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
O IA 111.111.2.2/32 [110/2] via 111.111.12.2, 00:02:03, FastEthernet0/0

R2#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
111.111.6.1 1 FULL/DR 00:00:34 111.111.12.1 FastEthernet0/1
111.111.6.1 1 FULL/DR 00:00:35 111.111.0.1 FastEthernet0/0

R2#show ip route ospf
111.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
O IA 111.111.5.1/32 [110/2] via 111.111.12.1, 00:02:00, FastEthernet0/1
O IA 111.111.4.1/32 [110/2] via 111.111.12.1, 00:02:00, FastEthernet0/1
O IA 111.111.6.1/32 [110/2] via 111.111.12.1, 00:02:00, FastEthernet0/1

Task 2:

R1:
router ospf 1
area 2 range 111.111.4.0 255.255.252.0 not-advertise

Verification:

R2#ping 111.111.4.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 111.111.4.1, timeout is 2 seconds:
…..
Success rate is 0 percent (0/5)

R2#ping 111.111.5.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 111.111.5.1, timeout is 2 seconds:
…..
Success rate is 0 percent (0/5)

R2#ping 111.111.6.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 111.111.6.1, timeout is 2 seconds:
…..
Success rate is 0 percent (0/5)

Task 3:

R1:
router ospf 1
default-information originate always

Verification:

R2#show ip route ospf
O*E2 0.0.0.0/0 [110/1] via 111.111.12.1, 00:00:51, FastEthernet0/1
[110/1] via 111.111.0.1, 00:00:51, FastEthernet0/0

Task 4:

R1:
router ospf 1
area 12 virtual-link 111.111.2.2

R2:
router ospf 1
area 12 virtual-link 111.111.6.1

Verification:

R1# show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
111.111.2.2 0 FULL/ – 00:00:36 111.111.0.2 OSPF_VL0
111.111.2.2 1 FULL/BDR 00:00:30 111.111.12.2 FastEthernet0/0
111.111.2.2 1 FULL/BDR 00:00:36 111.111.0.2 FastEthernet0/1

R1#sh ip ospf virtual-links
Virtual Link OSPF_VL0 to router 111.111.2.2 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 12, via interface FastEthernet0/1, Cost of using 1
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:05
Adjacency State FULL (Hello suppressed)
Index 1/2, retransmission queue length 0, number of retransmission 1
First 0×0(0)/0×0(0) Next 0×0(0)/0×0(0)
Last retransmission scan length is 1, maximum is 1
Last retransmission scan time is 0 msec, maximum is 0 msec

R2#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
111.111.6.1 0 FULL/ – 00:00:36 111.111.0.1 OSPF_VL0
111.111.6.1 1 FULL/DR 00:00:32 111.111.12.1 FastEthernet0/1
111.111.6.1 1 FULL/DR 00:00:33 111.111.0.1 FastEthernet0/0

R2#sh ip ospf virtual-links
Virtual Link OSPF_VL0 to router 111.111.6.1 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 12, via interface FastEthernet0/0, Cost of using 1
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:09
Adjacency State FULL (Hello suppressed)
Index 1/2, retransmission queue length 0, number of retransmission 1
First 0×0(0)/0×0(0) Next 0×0(0)/0×0(0)
Last retransmission scan length is 1, maximum is 1
Last retransmission scan time is 4 msec, maximum is 4 msec

Task 5:

R1:
interface FastEthernet0/0
ip ospf authentication-key Cisco

router ospf 1
area 0 authentication
area 12 virtual-link 111.111.2.2 authentication-key Cisco

R2:
interface FastEthernet0/1
ip ospf authentication-key Cisco

router ospf 1
area 0 authentication
area 12 virtual-link 111.111.6.1 authentication-key Cisco