1 © 2003, Cisco Systems, Inc. All rights reserved. CCNA 3 v3.0 Module 2 Single-Area OSPF

222 © 2003, Cisco Systems, Inc. All rights reserved. Objectives Link-state routing protocol Single-area OSPF concepts Single-area OSPF configuration

333 © 2003, Cisco Systems, Inc. All rights reserved. Overview of Link-State and Distance Vector Routing

444 © 2003, Cisco Systems, Inc. All rights reserved. Link-State Routing Features

555 © 2003, Cisco Systems, Inc. All rights reserved. How Routing Information Is Maintained

666 © 2003, Cisco Systems, Inc. All rights reserved. Link-State Routing Protocol Algorithms

777 © 2003, Cisco Systems, Inc. All rights reserved. Advantages and Disadvantages of Link- State Routing

888 © 2003, Cisco Systems, Inc. All rights reserved. Comparing Distance Vector and Link-State Routing

999 © 2003, Cisco Systems, Inc. All rights reserved. OSPF Overview OSPF is becoming the preferred IGP protocol when compared with RIPv1 and RIPv2 because it is scalable.

10 © 2003, Cisco Systems, Inc. All rights reserved. OSPF Terminology

11 © 2003, Cisco Systems, Inc. All rights reserved. More OSPF Terminology

12 © 2003, Cisco Systems, Inc. All rights reserved. Comparing OSPF Link State with Distance Vector Routing Protocols

13 © 2003, Cisco Systems, Inc. All rights reserved. Shortest Path Algorithm The best path is the lowest-cost path.

14 © 2003, Cisco Systems, Inc. All rights reserved. OSPF Network Types

15 © 2003, Cisco Systems, Inc. All rights reserved. OSPF Hello Protocol

16 © 2003, Cisco Systems, Inc. All rights reserved. Steps in the Operation of OSPF Discover neighbors

17 © 2003, Cisco Systems, Inc. All rights reserved. Steps in the Operation of OSPF Elect DR and BDR on Multi Access Network

18 © 2003, Cisco Systems, Inc. All rights reserved. Steps in the Operation of OSPF Selecting the Best Route

19 © 2003, Cisco Systems, Inc. All rights reserved. Basic OSPF Configuration

20 © 2003, Cisco Systems, Inc. All rights reserved. Basic OSPF Configuration

21 © 2003, Cisco Systems, Inc. All rights reserved. Configuring OSPF Loopback Address and Router Priority

22 © 2003, Cisco Systems, Inc. All rights reserved. Setting OSPF Priority The priorities can be set to any value from 0 to 255. A value of 0 prevents that router from being elected. A router with the highest OSPF priority will win the election for DR.

23 © 2003, Cisco Systems, Inc. All rights reserved. Modifying OSPF Cost Metric

24 © 2003, Cisco Systems, Inc. All rights reserved. Configuring OSPF Authentication

25 © 2003, Cisco Systems, Inc. All rights reserved. Configuring OSPF Timers

26 © 2003, Cisco Systems, Inc. All rights reserved. OSPF - Propagating a Default Route

27 © 2003, Cisco Systems, Inc. All rights reserved. Common OSPF Configuration Issues

28 © 2003, Cisco Systems, Inc. All rights reserved. Verifying OSPF Configuration show ip protocol show ip route show ip ospf interface shop ip ospf show ip ospf neighbor detail show ip ospf database

29 © 2003, Cisco Systems, Inc. All rights reserved. The debug and clear Commands for OSPF Verification