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Troubleshooting the configuration system failures
If the router operates properly after being powered on, the boot information is displayed on the
configuration terminal. If the configuration system is faulty, the configuration terminal displays garbled
characters or does not display anything.
No display on the configuration terminal
Symptom
After the router is powered on, the console terminal does not display anything.
Solution
Follow these steps to troubleshoot the configuration system failures first:
1. Verify that the power supply system is operating properly.
2. Verify that the console cable is properly connected.
If the cause cannot be located in the steps above, the possible reasons are as follows:
The console cable is connected to an incorrect serial port (the serial port in use is not the one set on
the configuration terminal).
The properties of the configuration terminal are incorrect. You must configure the configuration
terminal as follows: set Bits per second to 9600, Data bits to 8, Parity to None, Stop bits to 1, Flow
control to None, and Terminal Emulation to VT100.
The console cable is broken.
Garbled characters on the configuration terminal
Symptom
After the router is powered on, the configuration terminal displays garbled characters.
Solution
Verify that the Data bits field is set to 8 for the configuration terminal. If the Data bits field is set to 5 or
6, the configuration terminal displays garbled characters.
No response from the serial port
Symptom
No boot information is displayed on the configuration terminal when the router starts up or restarts up.
Solution
Verify that the serial cable is in good condition and the serial port properties are correct.
Troubleshooting user password loss
Symptom
If you lose your user password, you cannot log in to the system.
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