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CHAPTER
3-1
Cisco uBR10012 Universal Broadband Router Troubleshooting Guide
OL-1237-01
3
Troubleshooting PRE-1 Modules
This chapter describes how to troubleshoot Performance Routing Engine (PRE-1) modules. It provides
information on troubleshooting PRE-1 fault states, the management Ethernet port, and the serial port.
• Information Required for Troubleshooting PRE-1 Modules, page 3-1
• PRE Module Not Supported, page 3-2
• PRE-1 Module Status Screen, page 3-2
• Booting Up with Redundant PRE-1 Modules, page 3-3
• PRE-1 Module Faults, page 3-4
• Ethernet Connection Problems, page 3-6
• Console Port Serial Connection Problems, page 3-7
• Troubleshooting Common System Problems, page 3-8
Information Required for Troubleshooting PRE-1 Modules
The PRE-1 module is the primary processor for the Cisco uBR10012 router, and any problems with the
PRE-1 module affect all operations. If you suspect a problem with the PRE-1 module, please collect the
following information before proceeding further, to aid in troubleshooting the problem:
Step 1 Capture all console logs and system messages.
Step 2 Capture the output of the show tech-support command. Registered users on Cisco.com can decode the
output of this command by using the Output Interpreter tool, which is at the following URL:
https://www.cisco.com/cgi-bin/Support/OutputInterpreter/home.pl
Step 3 Capture the complete bootup sequence, especially if the router is reporting errors at bootup.
Step 4 If the router is unresponsive, or if it refuses to boot to the Cisco IOS prompt, reboot the router to the
ROMMON prompt and capture a stack trace, using the stack ROMMON command. For more
information on this procedure, see the Obtaining a Stack Trace from ROM Monitor section in the
Troubleshooting Router Hangs document, at the following URL:
http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a0080106fd7.shtml