![]() The show stacks output is one of the most indispensable sources of information to collect when the router crashes. The show stacks EXEC command is used to monitor the stack usage of processes and interrupt routines. This command first appeared in Cisco IOS Software Release 10.0. IMPORTANT: If the router is reloaded after the crash (for example, if it has been power-cycled or the reload command has been issued), this information will be lost, so try to collect it before reloading! The show version EXEC command displays the configuration of the system hardware, the software version, the names and sources of configuration files and software images, the router uptime, and information on how the system has been restarted. This command first appeared in Cisco IOS ® Software Release 10.0. In order to use Cisco CLI Analyzer, you must be a registered customer, be logged in, and have JavaScript enabled. ![]() If you have the output of a show version, show stacks, show context, or show tech support command from your Cisco device, you can use Cisco CLI Analyzer to display potential issues and fixes. These outputs give some indication and information on the crash. All information about the crash, except that which has been successfully stored in the crashinfo file, is lost after a manual reload or power-cycle. ![]() When the router crashes, it is extremely important to gather as much information as possible about the crash before you manually reload or power-cycle the router. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. The ROM monitor identifies the error, prints a message, saves information about the failure, and restarts the system. A "system crash" is a situation where the system has detected an unrecoverable error and has restarted itself. The errors that cause crashes are typically detected by processor hardware, which automatically branches to special error handling code in the ROM monitor. This document describes how to troubleshoot router crashes.
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