IPv4 Routing with OSPF

Task - Implementing OSPF Authentication

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.
Use the network statement to activate OSPF.
Any new interface added must have OSPF activated automatically.
Ensure the neighborship between R3 and R10 is authenticated and the password uses a clear-text method.
Ensure the neighborship between R6 and R10 is authenticated and the password is md5 protected.
R1, R2, and R3 must enable md5 authentication for area 0, however, R1, R2, and R3 must only authenticate links to each other using the md5 method and not authenticate other links.
All passwords must be set to �cisco�.
Verify the OSPF adjacency and the routing table.
Also verify the authentication method.

Solutions:

R1-R10:

router ospf 1
 network 0.0.0.0 255.255.255.255 area 0

R3:

interface GigabitEthernet0/0
 ip ospf authentication
 ip ospf authentication-key cisco

router ospf 1
 area 0 authentication message-digest

interface GigabitEthernet0/1
 ip ospf message-digest-key 1 md5 cisco

interface GigabitEthernet0/7
 ip ospf message-digest-key 1 md5 cisco

interface GigabitEthernet0/5
 ip ospf authentication null 

interface GigabitEthernet0/6
 ip ospf authentication null

R6:

interface GigabitEthernet0/1
 ip ospf authentication message-digest
 ip ospf message-digest-key 1 md5 cisco

R10:

interface GigabitEthernet0/0
 ip ospf authentication
 ip ospf authentication-key cisco

interface GigabitEthernet0/1
 ip ospf authentication message-digest
 ip ospf message-digest-key 1 md5 cisco

R2:

router ospf 1
 area 0 authentication message-digest

interface GigabitEthernet0/0
 ip ospf message-digest-key 1 md5 cisco

interface GigabitEthernet0/7
 ip ospf message-digest-key 1 md5 cisco

interface GigabitEthernet0/5
 ip ospf authentication null 

interface GigabitEthernet0/6
 ip ospf authentication null


R1:

router ospf 1
 area 0 authentication message-digest

interface GigabitEthernet0/0
 ip ospf message-digest-key 1 md5 cisco

interface GigabitEthernet0/1
 ip ospf message-digest-key 1 md5 cisco

Verification:

R1#sh ip ospf neighbor 

Neighbor ID     Pri   State           Dead Time   Address         Interface
172.16.3.3        1   FULL/DR         00:00:38    172.16.13.3     GigabitEthernet0/1
172.16.2.2        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

R3#sh ip ospf  interface g0/0
GigabitEthernet0/0 is up, line protocol is up 
  Internet Address 172.16.103.3/24, Area 0, Attached via network Statement
  Process ID 1,  router ID 172.16.3.3, network Type BROADCAST, Cost: 1
  Topology-MTID    Cost    Disabled    Shutdown      Topology Name
        0           1         no          no            Base
  Transmit Delay is 1 sec, State WAITING, Priority 1
  No designated router on this network
  No backup designated router on this network
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:00
    Wait time before Designated router selection 00:00:31
  Supports Link-local Signaling (LLS)
  Cisco NSF helper support enabled
  IETF NSF helper support enabled
  Index 1/1/1, flood queue length 0
  Next 0x0(0)/0x0(0)/0x0(0)
  Last flood scan length is 0, maximum is 0
  Last flood scan time is 0 msec, maximum is 0 msec
 neighbor Count is 0, Adjacent neighbor count is 0 
  Suppress hello for 0 neighbor(s)
  Simple password authentication enabled

R3#sh ip ospf  interface g0/1
GigabitEthernet0/1 is up, line protocol is up 
  Internet Address 172.16.13.3/24, Area 0, Attached via network Statement
  Process ID 1,  router ID 172.16.3.3, network Type BROADCAST, Cost: 1
  Topology-MTID    Cost    Disabled    Shutdown      Topology Name
        0           1         no          no            Base
  Transmit Delay is 1 sec, State DR, Priority 1
  Designated  router (ID) 172.16.3.3, Interface address 172.16.13.3
  No backup designated router on this network
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    oob-resync timeout 40
    Hello due in 00:00:07
  Supports Link-local Signaling (LLS)
  Cisco NSF helper support enabled
  IETF NSF helper support enabled
  Index 1/2/2, flood queue length 0
  Next 0x0(0)/0x0(0)/0x0(0)
  Last flood scan length is 0, maximum is 0
  Last flood scan time is 0 msec, maximum is 0 msec
 neighbor Count is 0, Adjacent neighbor count is 0 
  Suppress hello for 0 neighbor(s)
  Cryptographic authentication enabled
    Youngest key id is 1