Chapter 3. Troubleshooting Tools

Cisco IOS has a number of ways to extract data about the state of the machine. Understanding the capabilities of the operating system and how to use them effectively can reduce time-to-repair and the stress of a network outage.

IOS Filtering Tools

Most of the commands for pulling information from a router are familiar to anyone with Cisco IOS experience. Many people are not familiar with the filtering techniques that enable a troubleshooter to quickly focus.

Some of these filters are command-specific. Consider show ip route, which is a familiar command. When used, this command shows a complete routing table (as shown here):

The output for this command can continue over many ...

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