HP 7500 Series - Troubleshooting; Troubleshooting Methods; Troubleshooting the System; Troubleshooting on Startup

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Troubleshooting
Troubleshooting methods
When an HP 7500 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."
• T
he main processing unit (MPU) provides the LEDs for the power supply system, fan assembly, MPUs,
line processing units (LPUs), CF cards, and ports. 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 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, see "Support and other
resour
ces."
TIP:
Clean your switch periodically because the noncompliant operating environments of switches might 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
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 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 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.
• The console cable fails. To solve this problem, replace the console cable.