Chapter 9. Single-Area OSPF

This chapter provides information and commands concerning the following topics:

Configuring OSPF

Using wildcard masks with OSPF areas

Loopback interfaces

Router ID

DR/BDR elections

Modifying cost metrics

Authentication: Simple

Authentication: Using MD5 encryption

Timers

Propagating a default route

Verifying OSPF configuration

Troubleshooting OSPF

Configuration example: Single area OSPF

Configuring OSPF

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Using Wildcard Masks with OSPF Areas

When compared to an IP address, a wildcard mask identifies which addresses get matched for placement into an area:

A 0 (zero) in a wildcard mask means ...

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