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Troubleshooting
Troubleshooting methods
When your switch fails, you can use the following methods to troubleshoot the switch:
•
Command line interface (CLI) provided by the switch. At the CLI, you can use the related commands
to display the hardware information, and locate the hardware failures.
The main processing unit (MPU) provides the LEDs for the fans and cards. You can locate the failures
•
according to the LED status on the MPU. For more information about the LED status on the MPU, see
"Appendix C LEDs."
The MPU or LPU of the switch provides the port status LEDs, with which you can detect port failures.
•
For more information about the LED status on the LPU, see "Appendix C LEDs."
NOTE:
If you cannot locate failures by following the guidelines in this chapter, contact the local agents or
technical support engineers. For more information, see
TIP:
Clean your switch periodically because the noncompliant operating environments of switches may cause
switch failures. At the same time, examine the installation environments against the requirements in
"Preparing for installation." Make sure the switch operates in a compliant environment. Additionally,
periodically perform the power-on test for the spare switches.
Troubleshooting the system
Configuration terminal problems
If the configuration environment setup is correct, the configuration terminal displays boot information
when the switch is powered on. If the setup is incorrect, the configuration terminal displays nothing or
garbled text.
No terminal display
If the configuration terminal displays nothing when the switch is powered on, verify the following items:
The power supply system is operating correctly.
•
•
The MPU is operating correctly.
The console cable has been connected to the console port of the MPU.
•
If no problem is found, the following failure reasons may apply:
The console cable is connected to an incorrect serial interface. (The serial interface in use is not the
•
one set on the terminal.) To solve this problem, select a correct serial interface.
The console cable fails. To solve this problem, replace the console cable.
•
"Technical
support."
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Table of Contents
Troubleshooting
