OSPF Lab 8

Tasks:

1. Enable OSPF on the routers according to the network diagram.
R2 should be elected designated router. If R2 is down then R3 should be elected designated router. Use few network statements on R4.

2. R4’s loopback interfaces should appear with a mask of /24 in OSPF domain.

3. R1, R2, and R3 should have one route in their routing tables to reach R4’s loopback interfaces.

4. Redistribute loopback 0 interface on R1into OSPF. R4 should reach the R1’s, R2’s, and R3’s F0/1 interfaces. R2 and R3 should not be configured to accomplish the task. You allowed to add one static route.

Lab Diagram:

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

Solutions:

Task 1

R1:
interface FastEthernet0/0
ip ospf priority 0

router ospf 1
network 111.111.14.1 0.0.0.0 area 0
network 111.111.123.1 0.0.0.0 area 1

R2:
router ospf 1
network 111.111.123.2 0.0.0.0 area 1

R3:
interface FastEthernet0/0
ip ospf priority 10

router ospf 1
network 111.111.123.3 0.0.0.0 area 1

R4:
router ospf 1
network 111.111.4.0 0.0.3.255 area 2
network 111.111.14.4 0.0.0.0 area 0

Verification:

R1#show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface
111.111.6.4 1 FULL/BDR 00:00:33 111.111.14.4 FastEthernet0/1
111.111.123.2 1 FULL/DR 00:00:34 111.111.123.2 FastEthernet0/0
111.111.123.3 10 FULL/BDR 00:00:29 111.111.123.3 FastEthernet0/0

R1#show ip route ospf
111.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
O IA 111.111.4.4/32 [110/2] via 111.111.14.4, 00:00:15, FastEthernet0/1
O IA 111.111.5.4/32 [110/2] via 111.111.14.4, 00:00:15, FastEthernet0/1
O IA 111.111.6.4/32 [110/2] via 111.111.14.4, 00:00:00, FastEthernet0/1

R2#show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface
111.111.1.1 0 FULL/DROTHER 00:00:38 111.111.123.1 FastEthernet0/0
111.111.123.3 10 FULL/BDR 00:00:37 111.111.123.3 FastEthernet0/0

R2#show ip route ospf
111.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
O IA 111.111.4.4/32 [110/3] via 111.111.123.1, 00:00:27, FastEthernet0/0
O IA 111.111.5.4/32 [110/3] via 111.111.123.1, 00:00:27, FastEthernet0/0
O IA 111.111.6.4/32 [110/3] via 111.111.123.1, 00:00:13, FastEthernet0/0
O IA 111.111.14.0/24 [110/2] via 111.111.123.1, 00:07:55, FastEthernet0/0

R3#show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface
111.111.1.1 0 FULL/DROTHER 00:00:35 111.111.123.1 FastEthernet0/0
111.111.123.2 1 FULL/DR 00:00:39 111.111.123.2 FastEthernet0/0

R3#show ip route ospf
111.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
O IA 111.111.4.4/32 [110/3] via 111.111.123.1, 00:01:00, FastEthernet0/0
O IA 111.111.5.4/32 [110/3] via 111.111.123.1, 00:01:00, FastEthernet0/0
O IA 111.111.6.4/32 [110/3] via 111.111.123.1, 00:00:45, FastEthernet0/0
O IA 111.111.14.0/24 [110/2] via 111.111.123.1, 00:08:27, FastEthernet0/0

R4#show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface
111.111.1.1 1 FULL/DR 00:00:33 111.111.14.1 FastEthernet0/0

R4#show ip route ospf
111.0.0.0/24 is subnetted, 5 subnets
O IA 111.111.123.0 [110/2] via 111.111.14.1, 00:00:53, FastEthernet0/0

Task 2

R4:
interface Loopback0
ip ospf network point-to-point

interface Loopback1
ip ospf network point-to-point

interface Loopback1
ip ospf network point-to-point

Verification:

R1#show ip route ospf
111.0.0.0/24 is subnetted, 6 subnets
O IA 111.111.4.0 [110/2] via 111.111.14.4, 00:00:11, FastEthernet0/1
O IA 111.111.5.0 [110/2] via 111.111.14.4, 00:00:01, FastEthernet0/1
O IA 111.111.6.0 [110/2] via 111.111.14.4, 00:00:01, FastEthernet0/1

Task 3:

R4:
router ospf 1
area 2 range 111.111.4.0 255.255.252.0

Verification:

R1#show ip route ospf
111.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
O IA 111.111.4.0/22 [110/2] via 111.111.14.4, 00:03:16, FastEthernet0/1

R2#show ip route ospf
111.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
O IA 111.111.4.0/22 [110/3] via 111.111.123.1, 00:03:30, FastEthernet0/0
O IA 111.111.14.0/24 [110/2] via 111.111.123.1, 00:27:00, FastEthernet0/0

R3#show ip route ospf
111.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
O IA 111.111.4.0/22 [110/3] via 111.111.123.1, 00:03:33, FastEthernet0/0
O IA 111.111.14.0/24 [110/2] via 111.111.123.1, 00:27:02, FastEthernet0/0

Task 4:

R1:
ip route 111.111.0.0 255.255.252.0 f0/0
router ospf 1
redistribute connected subnets
summary-address 111.111.0.0 255.255.252.0

Verification:

R4#ping 111.111.2.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 111.111.2.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/34/84 ms

R4#ping 111.111.3.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 111.111.3.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/36/68 ms