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1. http://www.acit.in OSPF (Open Shortest Path First)

5. http://www.acit.in/ OSPF - Network Diagram LAN - 192.168.1.0/24 LAN – 192.168.2.0/24 LAN - 192.168.3.0/24 AREA 0 E0 192.168.1.1/24 E0 192.168.2.1/24 E0 192.168.3.1/24 10.0.0.1/8 S0 S1 10.0.0.2/8 11.0.0.1/8 S0 S1 11.0.0.2/8 CHE HYD BAN

8. How OSPF Works http://www.acit.in HYD CHE 10.0.0.1/8 SO 10.0.0.2/8 S1 Ex-Start STATE Exchange State No, I will start exchange because I have a higher router ID I will start exchange because I have router ID 172.16.0.1 Here is a summary of my link-state database Here is a summary of my link-state database

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11. Naveen Patel exit Hyderabad(config-if)# Hyderabad(config)# telnet 192.168.1.1 ================================ Welcome to Hyderabad Router ================================ User Access Verification password : **** **** enable configure terminal interface serial 0 ip address 10.0.0.1 255.0.0.0 no shut clockrate 64000 encapsulation hdlc Hyderabad> password : Hyderabad# Enter configuration commands, one per line. End with CNTL/Z. Hyderabad(config)# Hyderabad(config-if)# Hyderabad(config-if)# Hyderabad(config-if)# Hyderabad(config-if)# Microsoft Windows 2000 [Version 5.00.2195] (C) Copyright 1985-2000 Microsoft Corp. C:gt; Connecting ..... Directly Connected Networks on HYDERABAD Router 192.168.1.0 10.0.0.0

12. Naveen Patel Hyderabad(config)# router ospf 1 Hyderabad(config-router)# Hyderabad(config-router)# network 192.168.1.0 0.0.0.255 area 0 Hyderabad(config-router)# network 10.0.0.0 0.255.255.255 area 0 no ip routing Hyderabad(config)# Hyderabad(config)# ip routing Configuring OSPF Router(config)# router ospf <pid> Router(config-router)# network <Network ID> <wildcard mask> area <area id>

13. Naveen Patel show ip route Hyderabad# 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 11.0.0.0/8 [110/128] via 10.0.0.2, 00:00:36, Serial0 C 192.168.1.0/24 is directly connected, Ethernet0 O 192.168.2.0/24 [110/74] via 10.0.0.2, 00:00:36, Serial0 O 192.168.3.0/24 [110/138] via 10.0.0.2, 00:00:36, Serial0 Hyderabad# ^ Z O – for OSPF routes 110 is nothing but Administrative Distance Metric of OSPF Cost Hyderabad(config)# router ospf 1 Hyderabad(config-router)# Hyderabad(config-router)# network 192.168.1.0 0.0.0.255 area 0 Hyderabad(config-router)# network 10.0.0.0 0.255.255.255 area 0 no ip routing Hyderabad(config)# Hyderabad(config)# ip routing

14. Naveen Patel show ip ospf database Hyderabad# OSPF Router with ID (192.168.1.1) (Process ID 1) Router Link States (Area 0) Link ID ADV Router Age Seq# Checksum Link 192.168.1.1 192.168.1.1 790 0x80000003 0x897B 3 192.168.2.1 192.168.2.1 234 0x80000005 0x542 5 192.168.3.1 192.168.3.1 232 0x80000003 0xD328 3 Hyderabad# show ip ospf neighbor Neighbor ID Pri State Dead Time Address 192.168.2.1 1 FULL/ - 00:00:36 10.0.0.2 Hyderabad#

15. Naveen Patel Chennai(config-if)# Chennai(config-if)# ================================ Welcome to Chennai Router ================================ User Access Verification password : **** **** enable configure terminal ip address 10.0.0.2 255.0.0.0 no shut encapsulation hdlc interface serial 0 Chennai> password : Chennai# Enter configuration commands, one per line. End with CNTL/Z. Chennai(config)# Chennai(config-if)# Chennai(config-if)# Chennai(config-if)# Chennai(config-if)# Microsoft Windows 2000 [Version 5.00.2195] (C) Copyright 1985-2000 Microsoft Corp. C:gt; Connecting ..... Chennai(config-if)# telnet 192.168.2.1 interface serial 1 ip address 11.0.0.1 255.0.0.0 no shut encapsulation hdlc Directly Connected Networks on CHENNAI Router 192.168.2.0 10.0.0.0 11.0.0.0

16. Naveen Patel Chennai(config)# router ospf 2 Chennai(config-router)# 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 0 no ip routing Chennai(config)# Chennai(config)# ip routing network 11.0.0.0 0.255.255.255 area 0 Chennai(config-router)# Configuring OSPF Router(config)# router ospf <pid> Router(config-router)# network <Network ID> <wildcard mask> area <area id>

17. Naveen Patel show ip route Chennai# 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, 00:01:33, Serial1 C 192.168.2.0/24 is directly connected, Ethernet0 O 192.168.3.0/24 [110/74] via 11.0.0.2, 00:01:33, Serial0 Chennai# ^ Z O – for OSPF routes 110 is nothing but Administrative Distance Metric of OSPF Cost Chennai(config)# router ospf 2 Chennai(config-router)# 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 0 no ip routing Chennai(config)# Chennai(config)# ip routing network 11.0.0.0 0.255.255.255 area 0 Chennai(config-router)#

18. Naveen Patel show ip ospf database Chennai# OSPF Router with ID (192.168.2.1) (Process ID 2) Router Link States (Area 0) Link ID ADV Router Age Seq# Checksum Link 192.168.1.1 192.168.1.1 1253 0x80000003 0x897B 3 192.168.2.1 192.168.2.1 695 0x80000005 0x542 5 192.168.3.1 192.168.3.1 693 0x80000003 0xD328 3 Chennai # show ip ospf neighbor Neighbor ID Pri State Dead Time Address 192.168.3.1 1 FULL/ - 00:00:35 11.0.0.2 192.168.1.1 1 FULL/ - 00:00:32 10.0.0.1 Chennai#

19. Naveen Patel exit Banglore(config-if)# Banglore(config)# ================================ Welcome to Banglore Router ================================ User Access Verification password : **** **** enable configure terminal ip address 11.0.0.2 255.0.0.0 no shut clockrate 64000 encapsulation hdlc Banglore> password : Banglore# Enter configuration commands, one per line. End with CNTL/Z. Banglore(config)# Banglore(config-if)# Banglore(config-if)# Banglore(config-if)# Banglore(config-if)# Microsoft Windows 2000 [Version 5.00.2195] (C) Copyright 1985-2000 Microsoft Corp. C:gt; Connecting ..... telnet 192.168.3.1 interface serial 1 Directly Connected Networks on Banglore Router 192.168.3.0 11.0.0.0

20. Naveen Patel Banglore(config)# router ospf 1 Banglore(config-router)# Banglore(config-router)# network 192.168.3.0 0.0.0.255 area 0 Banglore(config-router)# no ip routing Banglore(config)# Banglore(config)# ip routing network 11.0.0.0 0.255.255.255 area 0 Configuring OSPF Router(config)# router ospf <pid> Router(config-router)# network <Network ID> <wildcard mask> area <area id>

21. Naveen Patel show ip route Banglore# 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 10.0.0.0/8 [110/128] via 11.0.0.1, 00:02:09, Serial1 C 11.0.0.0/8 is directly connected, Serial1 O 192.168.1.0/24 [110/138] via 11.0.0.1, 00:02:09, Serial1 O 192.168.2.0/24 [110/74] via 11.0.0.1, 00:02:09, Serial1 C 192.168.3.0/24 is directly connected, Ethernet0 Banglore# ^ Z O – for OSPF routes 110 is nothing but Administrative Distance Metric of OSPF Cost Banglore(config)# router ospf 1 Banglore(config-router)# Banglore(config-router)# network 192.168.3.0 0.0.0.255 area 0 Banglore(config-router)# no ip routing Banglore(config)# Banglore(config)# ip routing network 11.0.0.0 0.255.255.255 area 0

22. Naveen Patel show ip ospf database Banglore# OSPF Router with ID (192.168.3.1) (Process ID 1) Router Link States (Area 0) Link ID ADV Router Age Seq# Checksum Link 192.168.1.1 192.168.1.1 1506 0x80000003 0x897B 3 192.168.2.1 192.168.2.1 948 0x80000005 0x542 5 192.168.3.1 192.168.3.1 944 0x80000003 0xD328 3 Banglore# show ip ospf neighbor Neighbor ID Pri State Dead Time Address 192.168.2.1 1 FULL/ - 00:00:37 11.0.0.1 Banglore#

23. Naveen Patel ping 192.168.3.10 Hyderabad# Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.3.10, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms Hyderabad# !!!!! ping 192.168.2.10 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.2.10, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms Hyderabad# !!!!!

24. Naveen Patel ping 192.168.1.10 Chennai# Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.10, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms Chennai# !!!!! ping 192.168.3.10 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.3.10, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms Chennai# !!!!!

25. Naveen Patel ping 192.168.1.10 Banglore# Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.10, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms Banglore# !!!!! ping 192.168.2.10 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.2.10, timeout is 2 seconds: Success rate is 100 percent (5/5), round-trip min/avg/max = 40/43/44 ms Banglore# !!!!!