Contents

6 Troubleshooting· 6-1

Troubleshooting methods· 6-1

General guidelines· 6-1

Configuration terminal display issues· 6-2

No display on the configuration terminal 6-2

Garbled display on the configuration terminal 6-2

Power module failure· 6-2

Fan tray failure· 6-3

MPU failure· 6-3

Service module failure· 6-4

Interface failure· 6-5

Technical support 6-5

 

6 Troubleshooting

This chapter describes how to troubleshoot your switch.

 

	TIP: Noncompliant operating environments might cause switch failures. To ensure correct operation of the switch, regularly clean the switch and check the ambient operating environment against the requirements in "Preparing for installation." For the spare switches in storage, regularly perform power-on tests.

 

Troubleshooting methods

When your switch fails, you can use the following methods to troubleshoot the switch:

·          You can use related commands at the CLI to display device information, and locate the failures. If any configuration error is found, re-configure the switch or restore the factory-default settings.

·          The MPU provides the LEDs for the fans and modules. You can locate the failures according to the LED status on the MPU. For more information about the LED status on the MPU, see "MPU LEDs."

·          The MPU or service module of the switch provides port status LEDs, with which you can detect port failures. For more information about the LED status on the service module, see "Service module LEDs."

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."

General guidelines

	IMPORTANT: To prevent an issue from causing loss of configuration, save the configuration each time you finish configuring a feature. For configuration recovery, regularly back up the configuration to a remote server.

 

When you troubleshoot the switch, follow these general guidelines:

·          To help identify the cause of the issue, collect system and configuration information, including:

¡  Symptom, time of failure, and configuration.

¡  Network topology information, including the network diagram, port connections, and points of failure.

¡  Log messages and diagnostic information.

¡  Physical evidence of failure:

-      Photos of the hardware.

-      Status of the LEDs.

¡  Steps you have taken, such as reconfiguration, cable swapping, and reboot.

¡  Output from the commands executed during the troubleshooting process.

·          To ensure safety, wear an ESD wrist strap when you replace or maintain a hardware component.

Configuration terminal display issues

No display on the configuration terminal

Symptom

The configuration terminal has no display when the switch is powered on.

Solution

To resolve the issue:

1.        Verify that the power system is operating correctly.

2.        Verify that the MPU is operating correctly.

3.        Verify that the console cable is connected correctly to the console port on the MPU.

4.        Verify that the console cable is connected to the serial port that has been specified and set on the terminal.

5.        Verify that the console cable is in good condition.

6.        If the issue persists, contact H3C Support.

Garbled display on the configuration terminal

Symptom

The configuration terminal has a garbled display.

Solution

To resolve the issue:

1.        Verify that the configuration terminal settings match those of the console port on the MPU, as follows:

¡  Baud rate—9,600.

¡  Data bits—8.

¡  Parity—None.

¡  Stop bits—1.

¡  Flow control—None.

If you modify the settings for the console port, modify the terminal settings accordingly.

2.        If the issue persists, contact H3C Support.

Power module failure

Symptom

One or more LEDs on a power module are off or red. (On the MPU, the PWR OK LED is off or the PWR OK/FAIL LED is red or off.)

For the LED descriptions, see "Appendix C LEDs."

Solution

To resolve the issue:

1.        Use the LED indications to assess the power module status and resolve the issues accordingly.

For the LED descriptions, see "Appendix C LEDs."

 

	NOTE: After a power module is disconnected from its power source, it is normal that the power module LEDs stay ON for several seconds.

 

2.        Examine the power module.

¡  Verify that the power module is compatible with the switch.

¡  Verify that the power module is operating correctly.

Use the display power command to display the power module status. If the power module status is Absent, the power module is not present or not securely installed in the slot. If the power module status is Fault, the power module cannot provide power input.

3.        Verify that the power cord is connected correctly and is in good condition.

4.        Verify that the power source is operating correctly and provides a voltage in the acceptable range.

5.        If the switch has empty power module slots, remove the power module, and install it in an empty power module slot after all its LEDs are off. Verify that the power module can operate correctly.

6.        Install a new power module of the same model in the same slot, and connect it to the same power source. If the new power module can operate correctly, the old power module is faulty. Replace the old power module.

7.        If the issue persists, collect the operating information of the switch, and contact H3C Support.

Fan tray failure

Symptom

The RUN/ALM LED on a fan tray is red or off. (On the MPU, the FAN OK LED is off or the FAN OK/FAIL LED is red or off.)

For the LED descriptions, see "Appendix C LEDs."

Solution

To resolve the issue:

1.        Use the LED indications to assess the fan tray status and resolve the issues accordingly.

For the LED descriptions, see "Appendix C LEDs."

2.        Execute the display fan command to display the operating state of the fan tray.

¡  If the state is Absent, no fan tray is present or the fan tray is not securely installed. Reinstall the fan tray to be sure the fan tray is installed securely.

¡  If the state is Fault, go to the next steps.

3.        Verify that the ambient temperature is in the acceptable range.

4.        Ensure adequate ventilation for the switch.

¡  Make sure no objects block the air inlet and outlet vents.

¡  If the switch has air filters, remove and clean the air filters.

¡  Verify that filler panels are installed in empty slots.

5.        If the issue persists, collect the operating information of the switch, and contact H3C Support.

MPU failure

Symptom

The LEDs for the MPU indicate a failure.

For the LED descriptions, see "MPU LEDs."

Solution

To resolve the issue:

1.        Use the LED indications to access the MPU status and resolve the issues accordingly.

For the LED descriptions, see "MPU LEDs."

2.        Verify that the power modules operate correctly. For more information, see "Power module failure."

3.        Verify that the system software image is present and correct.

Log in to the MPU through the console port and restart the MPU. If BootWare reports that a CRC error has occurred or that no system software image is available, reload the system software image.

4.        Examine the MPU.

a.    Verify that the MPU is compatible with the switch.

b.    Verify that the MPU is installed securely on the switch. You can remove and reinstall the MPU to make sure the MPU is installed securely.

c.    Press the RESET button on the MPU to reset the MPU.

5.        If the switch has an empty MPU slot, install the MPU in the slot to verify that the MPU can operate correctly.

6.        If the issue persists, collect the operating information of the switch, and contact H3C Support.

Service module failure

Symptom

On the MPU, the LEDs for a service module indicate a failure.

For the LED descriptions, see "MPU LEDs."

Solution

To resolve the issue:

1.        Use the LED indications to access the service module status and resolve the issues accordingly.

For the LED descriptions, see "MPU LEDs."

2.        Verify that the MPU is operating correctly. For more information, see "MPU failure."

3.        Examine the service module.

a.    Verify that the service module is compatible with the switch.

b.    Verify that the service module is installed securely.

You can remove and reinstall the service module to be sure the service module is installed securely in the slot.

4.        Verify that the software version supports the module. If the software version does not support the module, upgrade the software to a compatible version.

5.        Examine the power system of the switch.

a.    Verify that the power modules operate correctly. For more information, see "Power module failure."

b.    Calculate the total power consumption to verify that the power modules can provide enough power to support the switch. For more information, see "Power modules."

6.        If the switch has an empty slot, install the service module in an empty slot, and verify that it can operate correctly.

7.        If the issue persists, collect the operating information of the switch, and contact H3C Support.

Interface failure

Symptom

The LED for an interface connected to the network is off.

 

	NOTE: A management Ethernet interface or XFP interface each has two LEDs, LINK and ACT. The LED mentioned in this section for such an interface refers to the LINK LED. Each interface of any other type has only one LED.

 

Solution

To resolve the issue:

1.        Verify that the MPU or the service module where the interface resides operates correctly. For more information, see "MPU failure" or "Service module failure."

2.        Examine the cable.

a.    Verify that the cable is connected correctly.

For the cable connection procedure, see "Connecting the switch to the network."

b.    Verify that the cable is in good condition.

Use the cable to connect two interfaces of the same type that operate correctly. If the LEDs for the two interfaces are on, the cable is normal. If the LEDs for the two interfaces are off, the cable is faulty. Use a compliant cable to connect the interface. For more information about the compliant cables, see "Appendix D Cables."

3.        Examine the interface.

a.    Verify that the interface and its peer are the same in speed and duplex settings.

b.    If the interface uses a transceiver module, verify that the transceiver module type is compatible with the interface and the cable. You can also replace the transceiver module to be sure a correctly operating transceiver module is used.

c.    If the interface is a combo interface, make sure the port used for connection is activated.

 

NOTE: ·      A combo interface is a logical interface that contains one fiber port (Gigabit/100-Mbps SFP port) and one copper port (10/100/1000BASE-T GE port). The two ports share one interface view and cannot work simultaneously. You can use the combo enable { copper | fiber } command to activate one port. The other port is disabled automatically. ·      If the interface is brought down by the shutdown command, use the undo shutdown command to bring up the interface. ·      If the interface is found to be faulty, you can connect the cable to an idle interface of the same type, if any.

 

4.        If the issue persists, collect the operating information of the switch, and contact H3C Support.

Technical support

If the failures still exist, contact the agents or technical support engineers. Before contacting the customer service, prepare the following information to help the agents solve the problem as quickly as possible:

·          Arrival time of the switch

·          Serial number of the chassis (located on a label on the right of the rear panel)

·          Software version (Which you can view by using the display version command.)

·          Maintenance agreement or warranty card

·          Brief problem description

·          Brief explanation of the troubleshooting measures that have been taken

You can contact the customer service through the H3C website, or email.

Website: http://www.h3c.com

E-mail: service@h3c.com