As mentioned in Chapter 15, "Troubleshooting the Network Layer," there are two types of IOS commands to help you diagnose problems with the operation of your Cisco router. These are the show family of commands and the debug family of commands. The show commands display information in a formatted output and give a high to medium level of information. The debug commands display information about the actual interworkings of the IOS. This information can be about the packets that the router is processing or the actual IOS operation.
There are numerous commands in the show family that can be used to diagnose routing problems. Because the IOS commands exist in a hierarchical nature, there are many individual ...