IPv4 Routing with OSPF

Task - OSPF Router Identifiers

All routers 1 through 10 have been pre-configured with IP addresses.
Configure OSPF Process-ID 1 on all routers with all interfaces with an IP address configured being in Area 0.
Ensure that any new interface added that has an IP address configured should not have OSPF activated automatically.
Loopback 0 must be advertised without using the network statement under the OSPF process-id 1.
Ensure each router is configured with the router-id as X.X.X.X, where X is the router number.
Verify the OSPF adjacency and the routing table.
Also verify the router-ID of the routers.

Solutions:

R1:

router ospf 1
 router-id 1.1.1.1
 network 172.16.12.1 0.0.0.0 area 0
 network 172.16.13.1 0.0.0.0 area 0

interface Loopback0
 ip ospf 1 area 0

R2:

router ospf 1
 router-id 2.2.2.2
 network 172.16.12.2 0.0.0.0 area 0
 network 172.16.23.2 0.0.0.0 area 0
 network 172.16.24.2 0.0.0.0 area 0
 network 172.16.25.2 0.0.0.0 area 0

interface Loopback0
 ip ospf 1 area 0

R3:

router ospf 1
 router-id 3.3.3.3
 network 172.16.13.3 0.0.0.0 area 0
 network 172.16.23.3 0.0.0.0 area 0
 network 172.16.34.3 0.0.0.0 area 0
 network 172.16.36.3 0.0.0.0 area 0
 network 172.16.103.3 0.0.0.0 area 0

interface Loopback0
 ip ospf 1 area 0

R4:

router ospf 1
 router-id 4.4.4.4
 network 172.16.24.4 0.0.0.0 area 0
 network 172.16.34.4 0.0.0.0 area 0
 network 172.16.45.4 0.0.0.0 area 0
 network 172.16.46.4 0.0.0.0 area 0

interface Loopback0
 ip ospf 1 area 0

R5:

router ospf 1
 router-id 5.5.5.5
 network 172.16.25.5 0.0.0.0 area 0
 network 172.16.45.5 0.0.0.0 area 0
 network 172.16.56.5 0.0.0.0 area 0
 network 172.16.57.5 0.0.0.0 area 0

interface Loopback0
 ip ospf 1 area 0

R6:

router ospf 1
 router-id 6.6.6.6
 network 172.16.36.6 0.0.0.0 area 0
 network 172.16.46.6 0.0.0.0 area 0
 network 172.16.56.6 0.0.0.0 area 0
 network 172.16.68.6 0.0.0.0 area 0
 network 172.16.106.6 0.0.0.0 area 0

interface Loopback0
 ip ospf 1 area 0

R7:

router ospf 1
 router-id 7.7.7.7
 network 172.16.57.7 0.0.0.0 area 0
 network 172.16.78.7 0.0.0.0 area 0
 network 172.16.79.7 0.0.0.0 area 0

interface Loopback0
 ip ospf 1 area 0

R8:

router ospf 1
 router-id 8.8.8.8
 network 172.16.68.8 0.0.0.0 area 0
 network 172.16.78.8 0.0.0.0 area 0
 network 172.16.89.8 0.0.0.0 area 0

interface Loopback0
 ip ospf 1 area 0

R9:

router ospf 1
 router-id 9.9.9.9
 network 172.16.79.9 0.0.0.0 area 0
 network 172.16.89.9 0.0.0.0 area 0

interface Loopback0
 ip ospf 1 area 0

R10:

router ospf 1
 router-id 10.10.10.10
 network 172.16.103.10 0.0.0.0 area 0
 network 172.16.106.10 0.0.0.0 area 0

interface Loopback0
 ip ospf 1 area 0

Verification:

R1#sh ip ospf  neighbor 

Neighbor ID     Pri   State           Dead Time   Address         Interface
3.3.3.3           1   FULL/DR         00:00:38    172.16.13.3     GigabitEthernet0/1
2.2.2.2           1   FULL/DR         00:00:38    172.16.12.2     GigabitEthernet0/0

R1#sh ip route ospf
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 29 subnets, 2 masks
O        172.16.2.2/32 [110/2] via 172.16.12.2, 00:02:46, GigabitEthernet0/0
O        172.16.3.3/32 [110/2] via 172.16.13.3, 00:02:36, GigabitEthernet0/1
O        172.16.4.4/32 [110/3] via 172.16.13.3, 00:02:36, GigabitEthernet0/1
                       [110/3] via 172.16.12.2, 00:02:46, GigabitEthernet0/0
O        172.16.5.5/32 [110/3] via 172.16.12.2, 00:02:46, GigabitEthernet0/0
O        172.16.6.6/32 [110/3] via 172.16.13.3, 00:02:36, GigabitEthernet0/1
O        172.16.7.7/32 [110/4] via 172.16.12.2, 00:01:48, GigabitEthernet0/0
O        172.16.8.8/32 [110/4] via 172.16.13.3, 00:01:38, GigabitEthernet0/1
O        172.16.9.9/32 [110/5] via 172.16.13.3, 00:01:28, GigabitEthernet0/1
                       [110/5] via 172.16.12.2, 00:01:28, GigabitEthernet0/0
O        172.16.10.10/32 [110/3] via 172.16.13.3, 00:01:58, GigabitEthernet0/1
O        172.16.23.0/24 [110/2] via 172.16.13.3, 00:02:36, GigabitEthernet0/1
O        172.16.24.0/24 [110/2] via 172.16.12.2, 00:02:46, GigabitEthernet0/0
O        172.16.25.0/24 [110/2] via 172.16.12.2, 00:02:46, GigabitEthernet0/0
O        172.16.34.0/24 [110/2] via 172.16.13.3, 00:02:36, GigabitEthernet0/1
O        172.16.36.0/24 [110/2] via 172.16.13.3, 00:02:36, GigabitEthernet0/1
O        172.16.45.0/24 [110/3] via 172.16.13.3, 00:02:36, GigabitEthernet0/1
                        [110/3] via 172.16.12.2, 00:02:46, GigabitEthernet0/0
O        172.16.46.0/24 [110/3] via 172.16.13.3, 00:02:36, GigabitEthernet0/1
                        [110/3] via 172.16.12.2, 00:02:46, GigabitEthernet0/0
O        172.16.56.0/24 [110/3] via 172.16.13.3, 00:02:36, GigabitEthernet0/1
                        [110/3] via 172.16.12.2, 00:02:46, GigabitEthernet0/0
O        172.16.57.0/24 [110/3] via 172.16.12.2, 00:01:48, GigabitEthernet0/0
O        172.16.68.0/24 [110/3] via 172.16.13.3, 00:01:38, GigabitEthernet0/1
O        172.16.78.0/24 [110/4] via 172.16.13.3, 00:01:38, GigabitEthernet0/1
                        [110/4] via 172.16.12.2, 00:01:38, GigabitEthernet0/0
O        172.16.79.0/24 [110/4] via 172.16.12.2, 00:01:28, GigabitEthernet0/0
O        172.16.89.0/24 [110/4] via 172.16.13.3, 00:01:28, GigabitEthernet0/1
O        172.16.103.0/24 [110/2] via 172.16.13.3, 00:02:36, GigabitEthernet0/1
O        172.16.106.0/24 [110/3] via 172.16.13.3, 00:02:36, GigabitEthernet0/1

R1# sh ip ospf 
 Routing Process "ospf 1" with ID 1.1.1.1
 Start time: 06:47:21.880, Time elapsed: 00:05:13.817
 Supports only single TOS(TOS0) routes
 Supports opaque LSA
 Supports Link-local Signaling (LLS)
 Supports area transit capability
 Supports NSSA (compatible with RFC 3101)
 Supports Database Exchange Summary List Optimization (RFC 5243)
 Event-log enabled, Maximum number of events: 1000, Mode: cyclic
  router is not originating router-LSAs with maximum metric
 Initial SPF schedule delay 5000 msecs
 Minimum hold time between two consecutive SPFs 10000 msecs
 Maximum wait time between two consecutive SPFs 10000 msecs
 Incremental-SPF disabled
 Minimum LSA interval 5 secs
 Minimum LSA arrival 1000 msecs
 LSA group pacing timer 240 secs
 Interface flood pacing timer 33 msecs
 Retransmission pacing timer 66 msecs
 EXCHANGE/LOADING adjacency limit: initial 300, process maximum 300
 Number of external LSA 0. Checksum Sum 0x000000
 Number of opaque AS LSA 0. Checksum Sum 0x000000
 Number of DCbitless external and opaque AS LSA 0
 Number of DoNotAge external and opaque AS LSA 0
 Number of areas in this router is 1. 1 normal 0 stub 0 nssa
 Number of areas transit capable is 0
 External flood list length 0
 IETF NSF helper support enabled
 Cisco NSF helper support enabled
 Reference bandwidth unit is 100 mbps
    Area BACKBONE(0)
        Number of interfaces in this area is 3 (1 loopback)
 Area has no authentication
 SPF algorithm last executed 00:02:58.328 ago
 SPF algorithm executed 9 times
 Area ranges are
 Number of LSA 19. Checksum Sum 0x08C946
 Number of opaque link LSA 0. Checksum Sum 0x000000
 Number of DCbitless LSA 0
 Number of indication LSA 0
 Number of DoNotAge LSA 0
 Flood list length 0

R10#sh ip ospf 
 Routing Process "ospf 1" with ID 10.10.10.10
 Start time: 06:49:01.543, Time elapsed: 00:05:21.795
 Supports only single TOS(TOS0) routes
 Supports opaque LSA
 Supports Link-local Signaling (LLS)
 Supports area transit capability
 Supports NSSA (compatible with RFC 3101)
 Supports Database Exchange Summary List Optimization (RFC 5243)
 Event-log enabled, Maximum number of events: 1000, Mode: cyclic
  router is not originating router-LSAs with maximum metric
 Initial SPF schedule delay 5000 msecs
 Minimum hold time between two consecutive SPFs 10000 msecs
 Maximum wait time between two consecutive SPFs 10000 msecs
 Incremental-SPF disabled
 Minimum LSA interval 5 secs
 Minimum LSA arrival 1000 msecs
 LSA group pacing timer 240 secs
 Interface flood pacing timer 33 msecs
 Retransmission pacing timer 66 msecs
 EXCHANGE/LOADING adjacency limit: initial 300, process maximum 300
 Number of external LSA 0. Checksum Sum 0x000000
 Number of opaque AS LSA 0. Checksum Sum 0x000000
 Number of DCbitless external and opaque AS LSA 0
 Number of DoNotAge external and opaque AS LSA 0
 Number of areas in this router is 1. 1 normal 0 stub 0 nssa
 Number of areas transit capable is 0
 External flood list length 0
 IETF NSF helper support enabled
 Cisco NSF helper support enabled
 Reference bandwidth unit is 100 mbps
    Area BACKBONE(0)
        Number of interfaces in this area is 3 (1 loopback)
 Area has no authentication
 SPF algorithm last executed 00:04:46.209 ago
 SPF algorithm executed 4 times
 Area ranges are
 Number of LSA 19. Checksum Sum 0x08C946
 Number of opaque link LSA 0. Checksum Sum 0x000000
 Number of DCbitless LSA 0
 Number of indication LSA 0
 Number of DoNotAge LSA 0
 Flood list length 0