Continuing on from Lab 5 - Part 1 - Configuring a Simple Multi Area OSPF Network, we'll now add a few more routers to the network in preperation for some more advanced OSPF features in Part 3.

We'll first configure our router interfaces:

R2(config-if)#int f1/0
R2(config-if)#no ip address
R2(config-if)#ip address 10.2.3.1 255.255.255.252
R2(config-if)#int fa2/0
R2(config-if)#no ip address
R2(config-if)#ip address 10.2.4.1 255.255.255.252
R2(config-if)#no shut

R3(config)#int f0/0
R3(config-if)#ip address 10.2.3.2 255.255.255.252
R3(config-if)#no shutdown
R3(config-if)#interface fa2/0
R3(config-if)#ip address 10.3.5.1 255.255.255.252
R3(config-if)#no shutdown
R3(config-if)#interface fa3/0
R3(config-if)#ip address 10.3.6.1 255.255.255.252
R3(config-if)#no shutdown
R3(config-if)#interface loopback 0
R3(config-if)#ip address 172.16.3.1 255.255.255.0
R3(config-if)#ip ospf network point-to-point

R4(config)#interface fa0/0
R4(config-if)#ip address 10.2.4.2 255.255.255.252
R4(config-if)#no shut
R4(config-if)#int fa1/0
R4(config-if)#ip address 10.4.5.1 255.255.255.252
R4(config-if)#no shut
R4(config-if)#int l0
R4(config-if)#ip address 172.16.4.1 255.255.255.0
R4(config-if)#ip ospf network point-to-point

R5(config)#interface fastethernet 0/0
R5(config-if)#ip address 10.3.5.2 255.255.255.252
R5(config-if)#no shut
R5(config-if)#interface fastethernet 1/0
R5(config-if)#ip address 10.4.5.2 255.255.255.252
R5(config-if)#no shut
R5(config-if)#interface loopback 0
R5(config-if)#ip address 172.16.5.1 255.255.255.0
R5(config-if)#ip ospf network point-to-point

R6(config)#interface fastethernet 0/0
R6(config-if)#ip address 10.3.6.2 255.255.255.252
R6(config-if)#no shutdown
R6(config-if)#interface loopback 0
R6(config-if)#ip address 172.16.6.1 255.255.255.0
R6(config-if)#ip ospf network point-to-point

Next we'll configure OSPF on our new routers:

R2(config)#router ospf 1
R2(config-router)#no network 10.2.2.0 0.0.0.15 area 20
R2(config-router)#network 10.2.3.0 0.0.0.3 area 20
R2(config-router)#network 10.2.4.0 0.0.0.3 area 20
R2(config-router)#router-id 2.2.2.2

R3(config-if)#router ospf 1
R3(config-router)#network 10.0.0.0 0.255.255.255 area 20
R3(config-router)#network 172.16.3.0 0.0.0.255 area 20
R3(config-router)#router-id 3.3.3.3

R4(config-if)#router ospf 1
R4(config-router)#network 10.0.0.0 0.255.255.255 area 20 
R4(config-router)#network 172.16.4.0 0.0.0.255 area 20
R4(config-router)#router-id 4.4.4.4

R5(config-if)#router ospf 1
R5(config-router)#network 10.0.0.0 0.255.255.255 area 20
R5(config-router)#network 172.16.5.0 0.0.0.255 area 20
R5(config-router)#router-id 5.5.5.5

R6(config-if)#router ospf 1
R6(config-router)#network 10.0.0.0 0.255.255.255 area 20
R6(config-router)#network 172.16.6.0 0.0.0.255 area 20
R6(config-router)#router-id 6.6.6.6

Now that all our routers are configured lets verify our setup:

R0's routing table:

Gateway of last resort is not set

     172.16.0.0/24 is subnetted, 4 subnets
O IA    172.16.4.0 [110/4] via 10.0.0.2, 01:18:05, FastEthernet0/0
O IA    172.16.5.0 [110/5] via 10.0.0.2, 00:25:56, FastEthernet0/0
O IA    172.16.6.0 [110/5] via 10.0.0.2, 00:26:26, FastEthernet0/0
O IA    172.16.3.0 [110/4] via 10.0.0.2, 00:25:25, FastEthernet0/0
     10.0.0.0/30 is subnetted, 7 subnets
O IA    10.1.1.0 [110/2] via 10.0.0.2, 01:18:05, FastEthernet0/0
C       10.0.0.0 is directly connected, FastEthernet0/0
O IA    10.4.5.0 [110/4] via 10.0.0.2, 01:18:05, FastEthernet0/0
O IA    10.2.3.0 [110/3] via 10.0.0.2, 01:18:05, FastEthernet0/0
O IA    10.3.5.0 [110/4] via 10.0.0.2, 01:18:05, FastEthernet0/0
O IA    10.2.4.0 [110/3] via 10.0.0.2, 01:18:05, FastEthernet0/0
O IA    10.3.6.0 [110/4] via 10.0.0.2, 01:17:22, FastEthernet0/0
C    192.168.1.0/24 is directly connected, Loopback0

Ping from the left edge router R0 to the right edge router R6:

R0#ping 172.16.6.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.6.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/44/64 ms

We'll run a traceroute, again from R0 - R6:

R0#traceroute 172.16.6.1

Type escape sequence to abort.
Tracing the route to 172.16.6.1

  1 10.0.0.2 8 msec 12 msec 28 msec
  2 10.1.1.2 44 msec 56 msec 12 msec
  3 10.2.3.2 16 msec 32 msec 32 msec
  4 10.3.6.2 24 msec *  44 msec

Routing table on R5:

Gateway of last resort is not set

     172.16.0.0/24 is subnetted, 4 subnets
O       172.16.4.0 [110/2] via 10.4.5.1, 00:27:39, FastEthernet1/0
C       172.16.5.0 is directly connected, Loopback0
O       172.16.6.0 [110/3] via 10.3.5.1, 00:27:39, FastEthernet0/0
O       172.16.3.0 [110/2] via 10.3.5.1, 00:27:39, FastEthernet0/0
     10.0.0.0/30 is subnetted, 7 subnets
O IA    10.1.1.0 [110/3] via 10.4.5.1, 00:27:39, FastEthernet1/0
                 [110/3] via 10.3.5.1, 00:27:39, FastEthernet0/0
O IA    10.0.0.0 [110/4] via 10.4.5.1, 00:27:39, FastEthernet1/0
                 [110/4] via 10.3.5.1, 00:27:39, FastEthernet0/0
C       10.4.5.0 is directly connected, FastEthernet1/0
O       10.2.3.0 [110/2] via 10.3.5.1, 00:27:39, FastEthernet0/0
C       10.3.5.0 is directly connected, FastEthernet0/0
O       10.2.4.0 [110/2] via 10.4.5.1, 00:27:40, FastEthernet1/0
O       10.3.6.0 [110/2] via 10.3.5.1, 00:27:40, FastEthernet0/0
O IA 192.168.1.0/24 [110/5] via 10.4.5.1, 00:27:40, FastEthernet1/0
                    [110/5] via 10.3.5.1, 00:27:40, FastEthernet0/0

We'll ping from R5 - R0 which has two equal cost routes to the 192.168.1.0/24 network:

R5#ping 192.168.1.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/44/88 ms

We'll then run a traceroute, again from R5 - R0:

R5#traceroute 192.168.1.1

Type escape sequence to abort.
Tracing the route to 192.168.1.1

  1 10.4.5.1 24 msec
    10.3.5.1 8 msec
    10.4.5.1 8 msec
  2 10.2.3.1 4 msec
    10.2.4.1 28 msec
    10.2.3.1 8 msec
  3 10.1.1.1 4 msec 40 msec 44 msec
  4 10.0.0.1 32 msec *  40 msec