Routers Hardware Installation Guide

A-1
Cisco 3700 Series Routers Hardware Installation Guide
OL-2180-08
APPENDIX A
Troubleshooting
Your Cisco 3700 series router goes through extensive testing and burn-in before leaving the factory. If
you encounter problems, use the information in this appendix to help isolate problems or to eliminate
the router as the source of the problem.
This appendix includes the following sections:
• Solving Problems, page A-2
• Reading Front-Panel LEDs, page A-4
• Reading Rear Panel LEDs, page A-6
• Error Messages, page A-8
• Recovering a Lost Password, page A-12
Note To troubleshoot a network module, see the online Cisco Network Modules Hardware Installation Guide;
to troubleshoot interface cards, see the online Cisco Interface Cards Installation Guide.
If you cannot locate the source of the problem, contact a customer service representative for information
on how to proceed. For information about obtaining technical support, see the “Obtaining Technical
Assistance” section on page xvii. Before you call, have the following information ready:
• Chassis type and serial number
• Maintenance agreement or warranty information
• Type of software and version number
• Date you received the new chassis
• Brief description of the problem
• Brief explanation of the steps you have taken to isolate the problem