Cisco Systems UBR10012 manual Troubleshooting PRE-1 Modules

C H A P T E R 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-supportcommand. 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

Cisco uBR10012 Universal Broadband Router Troubleshooting Guide

OL-1237-01 3-1