Cisco 1751 - Manual (Page 48)

Chapter 3 Troubleshooting
Problem Solving
3-6
Cisco 1751 Router Hardware Installation Guide
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Router(config)# Ctrl-Z
Step 5 Save your configuration changes:
Router# copy running-config startup-config
Resetting the Configuration Register Value
Follow these steps once you have recovered or reconfigured a password:
Step 1 Enter the configure terminal command to enter configuration mode:
Router# configure terminal
Step 2 Enter the config-register command and the original configuration register value
that you recorded in
Step 5 .
Step 3 Press Ctrl-Z to exit configuration mode:
Router(config)# Ctrl-Z
Step 4 Reboot the router, and enter the recovered password.
Problem Solving
The key to problem solving is to isolate the problem to a specific subsystem by
comparing what the router is doing to what it should be doing.
When problem solving, consider the following subsystems of the router:
• WICs and VICs—Refer to the LEDs on the cards and the LEDs on the router
front panel to help identify a failure. For more information on WICs and
VICs, refer to the Cisco WAN Interface Cards Hardware Installation Guide
that comes with each card.
• Cables—Check all the external cables that connect the router to the network.
• Power system—Check the external power source, power cable, router power
supply, and circuit breaker. Check for inadequate ventilation or air circulation
that might cause overheating.