Oxygen 78-6896-01 User Manual

Troubleshooting Tools

This chapter describes the tools available to assist you in troubleshooting your ATM switch router and
contains the following sections:

• Using Diagnostic Commands

• Third-Party Troubleshooting Tools

Using Diagnostic Commands

You can use the show, debug, ping, and traceroute commands to monitor and troubleshoot your
internetwork.

show Commands

CHAPTER

2

You can use the show commands to perform many functions:

• Monitor switch router behavior during initial installation

• Monitor normal network operation

• Isolate problem interfaces, nodes, media, or applications

• Determine when a network is congested

• Determine the status of servers, clients, or other neighbors

Following are some of the most commonly used show commands:

Command Purpose

show interfaces
show interfaces atm
show interfaces atm-p
show interfaces cbr
show line

show controllers
show controllers atm
show controllers ethernet

show lane Displays the LAN emulation configuration.
show running-config Displays the switch router configuration currently running.

Displays statistics for the network interfaces.

Displays statistics for port adapter interface controllers.

78-6896-01

ATM Switch Router Troubleshooting Guide

2-1

Using Diagnostic Commands

Command Purpose

show startup-config Displays the switch router configuration stored in

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

show processes Displays information about the active processes on the switch router.
show stacks Displays information about the stack utilization of processes and

show version Displaysthe configuration of the system hardware, the software version,

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

Chapter 2 Troubleshooting Tools

nonvolatile RAM (NVRAM).

statistics.

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

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

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 debugcommands 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.

2-2

ATM Switch Router Troubleshooting Guide

78-6896-01