H3C Technologies H3C S7500E Series Switches - Manual (Page 86)

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Troubleshooting
Troubleshooting methods
When an S7500E 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. For more information about
the CLI, see "
Hardware management and maintenance ."
• The switching and routing processing unit (SRPU) provides the LEDs for the power supply system,
fans, SRPUs, line processing units (LPUs), CF cards, and ports. You can locate the failures according
to the LED status on the SRPU. For more information about the LED status on the SRPU, see
" Appendix C LEDs ."
• The 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 "
Technical support ."
TIP:
Clean your switch periodically because the noncompliant operating environments of switches might cause
switch failures. At the same time, check 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
Troubleshooting on startup
After you power on the switch, if the switch operates correctly, the startup information appears on the
console terminal. If the console terminal displays nothing or garbled characters, use the following
methods to troubleshoot the switch.
No display on the terminal
If the console terminal displays nothing after you power on the switch, verify the following items:
• The power supply system is operating correctly.
• The SRPU is operating correctly.
• The console cable has been connected to the console port of the SRPU.
If no problem is found, the following failure reasons might 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.