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TRANSCRIPT
www.ciscopress.comCopyright 2003
CCNA 3 Chapter 3
Single-Area OSPF
By
Your Name
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Objectives
• Link-state routing protocol
• Single-area OSPF concepts
• Single-area OSPF configuration
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Overview of Link-State and Distance Vector Routing
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Link-State Routing Features
• Respond quickly to network changes
• Send triggered updates only when a network change has occurred
• Send periodic updates known as link-state refreshes
• Use a hello mechanism to determine the reachability of neighbors
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How Routing Information Is Maintained
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Link-State Routing Algorithms
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Advantages and Disadvantages of Link-State Routing
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Comparing Distance Vector and Link-State Routing
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Single-Area OSPF Concepts
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OSPF Overview
OSPF is becoming the preferred IGP protocol when compared with RIPv1 and RIPv2 because it is scalable.
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OSPF Terminology
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Comparing OSPF with Distance Vector Routing Protocols
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Shortest Path Algorithm
The best path is the lowest-cost path.
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OSPF Network Types
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OSPF Hello Protocol
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Steps in the Operation of OSPF
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Single-Area OSPF Configuration
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Configuring the OSPF Routing Process
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Configuring OSPF Loopback Address and Router Priority
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Configuring Router 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.
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Modifying OSPF Cost Metric
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Configuring OSPF Authentication
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Configuring OSPF Timers
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OSPF, Propagating a Default Route
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Common OSPF Configuration Issues
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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
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The debug and clear Commands for OSPF Verification