1. 1

2. OSPF - Network Diagram
AREA 1 10.0.0.1/8
S0
HYD
AREA 2
11.0.0.1/8
S0
S1
10.0.0.2/8
CHE
E0
192.168.1.150/24
S1
BAN
11.0.0.2/8
E0
E0
192.168.2.150/24
192.168.3.150/24
AREA 0
LAN - 192.168.1.0/24
LAN - 192.168.2.0/24
LAN - 192.168.3.0/24
2

3. 3

4. Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:> telnet 192.168.1.150
Connecting .....
================================
Welcome to Hyderabad Router
================================
User Access Verification
password : ****
Directly Connected Networks on
Directly Connected Networks on
Hyderabad> enable
HYDERABAD Router
password : ****
HYDERABAD Router
Hyderabad# configure terminal
192.168.1.0
192.168.1.0
Enter configuration commands, one per line. End with CNTL/Z.
10.0.0.0
10.0.0.0
Hyderabad(config)# interface serial 0
Hyderabad(config-if)# ip address 10.0.0.1 255.0.0.0
Hyderabad(config-if)# no shut
Hyderabad(config-if)# clockrate 64000
Hyderabad(config-if)# encapsulation hdlc
Hyderabad(config-if)# exit
Hyderabad(config)#
4

5. Hyderabad(config)# no ip routing
Hyderabad(config)# ip routing
Hyderabad(config)# router ospf 1
Hyderabad(config-router)# network 192.168.1.0 0.0.0.255 area 1
Hyderabad(config-router)# network 10.0.0.0 0.255.255.255 area 1
Hyderabad(config-router)# Configuring OSPF
Configuring OSPF
Router(config)# router ospf <pid>
Router(config)# router ospf <pid>
Router(config-router)# network <Network ID>
Router(config-router)# network <Network ID>
<wildcard mask> area <area id>
<wildcard mask> area <area id>
5

6. Hyderabad(config)# no ip routing
Hyderabad(config)# ip routing
Hyderabad(config)# router ospf 1
Hyderabad(config-router)# network 192.168.1.0 0.0.0.255 area 1
Hyderabad(config-router)# network 10.0.0.0 0.255.255.255 area 1
Hyderabad(config-router)# ^Z
Hyderabad# show ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i- IS-IS, L1-IS-IS level-1, L2-IS-IS level-2,*- candidate default
U - per-user static route, o - ODR
Gateway of last resort is not set
C
10.0.0.0/8 is directly connected, Serial0
O IA 11.0.0.0/8 [110/128] via 10.0.0.2, 00:01:03, Serial0
C
192.168.1.0/24 is directly connected, Ethernet0
O IAO IA – for OSPF [110/74] via ofOSPF
192.168.2.0/24 110 isnothing OSPF
Metric 10.0.0.2, 00:01:03, Serial0
O IA – for OSPF 110 isMetricof but
nothing but
Administrative Distance
O IAInterArea routes [110/138] via 10.0.0.2, 00:00:13, Serial0
192.168.3.0/24
Inter Area routes
Cost
Administrative Distance
Cost
Hyderabad#
6

7. Hyderabad# show ip ospf database
OSPF Router with ID (192.168.1.150) (Process ID 1)
Router Link States (Area 1)
Link ID
192.168.1.150
192.168.2.150
ADV Router
192.168.1.150
192.168.2.150
Age
272
273
Seq#
Checksum Link
0x80000003 0xA163
3
0x80000002 0xBACC
2
Summary Net Link States (Area 1)
Link ID
11.0.0.0
192.168.2.0
192.168.3.0
ADV Router
192.168.2.150
192.168.2.150
192.168.2.150
Age
273
273
208
Seq#
0x80000001
0x80000001
0x80000001
Checksum
0xDA15
0x8441
0xFB88
Hyderabad# show ip ospf neighbor
Neighbor ID
192.168.2.150
Hyderabad#
Pri
1
State
FULL/
-
Dead Time
00:00:32
Address
10.0.0.2
7

8. Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:> telnet 192.168.2.150
Connecting .....
================================
Welcome to Chennai Router
================================
User Access Verification
password : ****
Directly Connected Networks on
Chennai> enable Directly Connected Networks on
CHENNAI Router
password : ****
CHENNAI Router
Chennai# configure terminal
192.168.2.0
192.168.2.0
Enter configuration commands, one per line. End with CNTL/Z.
10.0.0.0
10.0.0.0
Chennai(config)# interface serial 1
11.0.0.0
11.0.0.0
Chennai(config-if)# ip address 10.0.0.2 255.0.0.0
Chennai(config-if)# no shut
Chennai(config-if)# encapsulation hdlc
Chennai(config-if)# interface serial 0
Chennai(config-if)# ip address 11.0.0.1 255.0.0.0
Chennai(config-if)# no shut
Chennai(config-if)# encapsulation hdlc
8

9. Chennai(config)# no ip routing
Chennai(config)# ip routing
Chennai(config)# router ospf 2
Chennai(config-router)# network 192.168.2.0 0.0.0.255 area 0
Chennai(config-router)# network 10.0.0.0 0.255.255.255 area 1
Chennai(config-router)# network 11.0.0.0 0.255.255.255 area 2
Configuring OSPF
Configuring OSPF
Chennai(config-router)#
Router(config)# router ospf <pid>
Router(config)# router ospf <pid>
Router(config-router)# network <Network ID>
Router(config-router)# network <Network ID>
<wildcard mask> area <area id>
<wildcard mask> area <area id>
9

10. Chennai(config)# no ip routing
Chennai(config)# ip routing
Chennai(config)# router ospf 2
Chennai(config-router)# network 192.168.2.0 0.0.0.255 area 0
Chennai(config-router)# network 10.0.0.0 0.255.255.255 area 1
Chennai(config-router)# network 11.0.0.0 0.255.255.255 area 2
Chennai(config-router)# ^Z
Chennai# show ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i- IS-IS, L1-IS-IS level-1, L2-IS-IS level-2,*- candidate default
U - per-user static route, o - ODR
Gateway of last resort is not set
C
10.0.0.0/8 is directly connected, Serial1
C
11.0.0.0/8 is directly connected, Serial0
O
192.168.1.0/24 [110/74] via 10.0.0.1, 00:01:04, Serial1
C
192.168.2.0/24 is directly connected, Ethernet0
O
192.168.3.0/24 [110/74] isMetricof OSPF 00:00:09, Serial0
Metric of OSPF
110 isnothing but
110 via 11.0.0.2,
nothing but
O – for OSPF routes
O – for OSPF routes Administrative Distance
Chennai#
Cost
Administrative Distance
10
Cost

11. Chennai# show ip ospf database
OSPF Router with ID (192.168.2.150) (Process ID 2)
Router Link States (Area 0)
Link ID
192.168.2.150
ADV Router
192.168.2.150
Age
472
Seq#
Checksum Link
0x80000002 0xEFC7
1
Summary Net Link States (Area 0)
Link ID
10.0.0.0
11.0.0.0
192.168.1.0
192.168.3.0
ADV Router
192.168.2.150
192.168.2.150
192.168.2.150
192.168.2.150
Age
462
472
452
396
Seq#
0x80000001
0x80000001
0x80000001
0x80000001
Checksum
0xE709
0xDA15
0x1274
0xFB88
Router Link States (Area 1)
Link ID
192.168.1.150
192.168.2.150
--More—-
ADV Router
192.168.1.150
192.168.2.150
Age
463
462
Seq#
Checksum Link
0x80000003 0xA163
3
0x80000002 0xBACC
2
11

12. Summary Net Link States (Area 1)
Link ID
11.0.0.0
192.168.2.0
192.168.3.0
ADV Router
192.168.2.150
192.168.2.150
192.168.2.150
Age
462
465
400
Seq#
0x80000001
0x80000001
0x80000001
Checksum
0xDA15
0x8441
0xFB88
Router Link States (Area 2)
Link ID
192.168.2.150
192.168.3.150
ADV Router
192.168.2.150
192.168.3.150
Age
415
416
Seq#
Checksum Link
0x80000003 0xDAA8
2
0x80000003 0xD328
3
Summary Net Link States (Area 2)
Link ID
10.0.0.0
192.168.1.0
192.168.2.0
ADV Router
192.168.2.150
192.168.2.150
192.168.2.150
Chennai# show ip ospf
Neighbor ID
Pri
192.168.3.150
1
192.168.1.150
1
Chennai#
neighbor
State
FULL/ FULL/ -
Age
465
455
475
Seq#
0x80000001
0x80000001
0x80000001
Dead Time
00:00:35
00:00:32
Checksum
0xE709
0x1274
0x8441
Address
11.0.0.2
10.0.0.1
12

13. Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:> telnet 192.168.3.150
Connecting .....
================================
Welcome to Banglore Router
================================
User Access Verification
password : ****
Directly Connected Networks on
Banglore> enableDirectly Connected Networks on
Banglore Router
password : ****
Banglore Router
Banglore# configure terminal
192.168.3.0
192.168.3.0
Enter configuration commands, one per line. End with CNTL/Z.
11.0.0.0
11.0.0.0
Banglore(config)# interface serial 1
Banglore(config-if)# ip address 11.0.0.2 255.0.0.0
Banglore(config-if)# no shut
Banglore(config-if)# clockrate 64000
Banglore(config-if)# encapsulation hdlc
Banglore(config-if)# exit
Banglore(config)#
13

14. Banglore(config)# no ip routing
Banglore(config)# ip routing
Banglore(config)# router ospf 1
Banglore(config-router)# network 192.168.3.0 0.0.0.255 area 2
Banglore(config-router)# network 11.0.0.0 0.255.255.255 area 2
Banglore(config-router)#
Configuring OSPF
Configuring OSPF
Router(config)# router ospf <pid>
Router(config)# router ospf <pid>
Router(config-router)# network <Network ID>
Router(config-router)# network <Network ID>
<wildcard mask> area <area id>
<wildcard mask> area <area id>
14

15. Banglore(config)# no ip routing
Banglore(config)# ip routing
Banglore(config)# router ospf 1
Banglore(config-router)# network 192.168.3.0 0.0.0.255 area 2
Banglore(config-router)# network 11.0.0.0 0.255.255.255 area 2
Banglore(config-router)# ^Z
Banglore# show ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i- IS-IS, L1-IS-IS level-1, L2-IS-IS level-2,*- candidate default
U - per-user static route, o - ODR
Gateway of last resort is not set
O IA 10.0.0.0/8 [110/128] via 11.0.0.1, 00:02:26, Serial1
C
11.0.0.0/8 is directly connected, Serial1
O IAO IA – for OSPF [110/138] via OSPF
192.168.1.0/24
Metric of 11.0.0.1, 00:02:26, Serial1
O IA – for OSPF 110 isMetricof but
110 isnothing OSPF
nothing but
O IA 192.168.2.0/24 [110/74] viaDistance
Administrative Distance 00:02:26, Serial1
Inter Area routes
Cost
Administrative 11.0.0.1,
Inter Area routes
Cost
C
192.168.3.0/24 is directly connected, Ethernet0
Banglore#
15

16. Banglore# show ip ospf database
OSPF Router with ID (192.168.3.150) (Process ID 1)
Router Link States (Area 2)
Link ID
192.168.2.150
192.168.3.150
ADV Router
192.168.2.150
192.168.3.150
Age
935
934
Seq#
Checksum Link
0x80000003 0xDAA8
2
0x80000003 0xD328
3
Summary Net Link States (Area 2)
Link ID
10.0.0.0
192.168.1.0
192.168.2.0
ADV Router
192.168.2.150
192.168.2.150
192.168.2.150
Age
985
975
995
Seq#
0x80000001
0x80000001
0x80000001
Checksum
0xE709
0x1274
0x8441
Banglore# show ip ospf neighbor
Neighbor ID
192.168.2.150
Banglore#
Pri
1
State
FULL/
-
Dead Time
00:00:36
Address
11.0.0.1
16

17. Hyderabad# ping 192.168.3.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.3.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms
Hyderabad# ping 192.168.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms
Hyderabad#
17

18. Chennai# 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 = 40/43/44 ms
Chennai# ping 192.168.3.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.3.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms
Chennai#
18

19. Banglore# 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 = 40/43/44 ms
Banglore# ping 192.168.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms
Banglore#
19