Chapter 2 Troubleshooting Tools

Using Diagnostic Commands

Command

Purpose

 

 

show startup-config

Displays the switch router configuration stored in

 

nonvolatile RAM (NVRAM).

 

 

show flash

Displays the layout and contents of Flash memory.

 

 

show buffers

Displays statistics for the buffer pools on the switch router.

 

 

show memory

Shows statistics about the switch router memory, including free pool

 

statistics.

 

 

show processes

Displays information about the active processes on the switch router.

 

 

show stacks

Displays information about the stack utilization of processes and

 

interrupt routines, and the reason for the last system reboot.

 

 

show version

Displays the configuration of the system hardware, the software version,

 

the names and sources of configuration files, and the boot images.

 

 

For further information about show commands, refer to the ATM Switch Router Command Reference publication for your specific software version.

debug Commands

The debug privileged EXEC commands provide a wealth of information about the traffic seen (or not seen) on an interface, error messages generated by nodes on the network, protocol-specific diagnostic packets and cells, and other useful troubleshooting data.

Caution Exercise care when using debug commands. Many of these commands are processor intensive and can cause serious network problems (such as degraded performance or loss of connectivity) if they are enabled on an already heavily loaded switch router. When you finish using a debug command, remember to disable it with its specific no debug command (or use the no debug all command to turn off all debugging).

Appendix A, “Debugging an ATM Switch Router,” provides an overview of debug commands including how to use them when you are troubleshooting the ATM switch router.

In many situations, third-party diagnostic tools can be more useful and less intrusive than using debug commands. For more information, see the “Third-Party Troubleshooting Tools” section on page 2-3.

ping Commands

To check host reachability and network connectivity, use the ping user EXEC or privileged EXEC command. This command can be used to confirm basic network connectivity on IP networks.

For IP, the ping command sends Internet Control Message Protocol (ICMP) echo messages. If a station receives an ICMP echo message, it sends an ICMP echo reply message back to the source.

Using the extended command mode of the ping command, you can specify the supported IP header options, which allow the switch router to perform a more extensive range of test options. To enter ping extended command mode, enter yes at the extended commands prompt of the ping command.

ATM Switch Router Troubleshooting Guide

2-2

78-6896-01

 

 

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Oxygen 78-6896-01 manual Debug Commands, Ping Commands
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