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


Propagating a default route

Verifying OSPF configuration

Troubleshooting OSPF

Configuration example: Single area OSPF

Configuring OSPF


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 ...

Get CCNA Routing and Switching Portable Command Guide, Third Edition now with the O’Reilly learning platform.

O’Reilly members experience live online training, plus books, videos, and digital content from nearly 200 publishers.