CHAPTER
3-1
Cisco 10000 Series Router Troubleshooting Guide
OL-0439-02
3
Troubleshooting PREs
Troubleshooting PREs
This section describes how to troubleshoot Performance Routing Engines (PREs). It provides
information on troubleshooting PRE fault states, the management Ethernet port, and the serial port.
PRE Module Faults
The PRE provides the IP routing and forwarding functionality in the Cisco 10000 series router. Thus, in
a nonredundant PRE configuration, a PRE failure is a system failure. A redundant PRE configuration is
recommended.
If the PRE fails, the yellow PRE STATUS LED lights. Try rebooting the Cisco 10000 series router,
moving the card to a different PRE slot, or replacing the PRE with another one. In any event, you should
capture any error messages that appear on the console, as well as the state of the PRE LEDs and
alphanumeric display. Then you should contact the Cisco Technical Assistance Center (TAC).
Figure 3-1 describes the LED indicators on the PRE faceplate. Use these descriptions to verify the
operation of the PRE.
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