How to handle the hardware failure of the rack switch

"Common Failure One": Power supply module does not power

"Fault description"

The line card status light is not lit, the power led on the fan disk is not lit, the fan does not rotate, and the Supply module panel light is not lit.

"Probable cause."

Power module damaged, room power not open

"Troubleshooting Method"

1, first of all the power supply module switch to off state. Check that the cabinet wiring is correct.

2, detect the power supply in the, out, fail three LEDs, in and out is usually green (light on the normal), fail is usually red (light to indicate power failure)

3, check the cabinet power outlet and power cord connection is loose;

4, check the power supply module and power cord connection is loose;

5, check the Power module is installed in place, if necessary, unplug the power module;

6, check the power system back plate with the connectors whether the phenomenon of loose;

"Common fault Two": The main engine after the line card led abnormal

"Fault description"

The card status light is not lit or has been flashing or red, the card link/act light is long lit without inserting a connecting cable or fiber.

"Probable cause."

The line card is not plugged in place, the card or the chassis connector falls off

"Troubleshooting Method"

1, check whether the card has been inserted tight, or did not plug in place;

2, if not plugged, reinstall the line card, and ensure that the plug in place, and then tighten the fixed screws;

3, if the plug is still unable to work, check the slot corresponding back plate connectors whether there is loose phenomenon;

4, if there is, you can switch to other slots to test;

5, if not slot and installation problems, need to replace the line card;

"Common fault Three": Management board LED abnormal

"Fault description"

An abnormal behavior occurs when the management board LED is up or running for a period of time, such as status flashing or off, and the Alarm LED is red

"Probable cause."

Management board not plugged in, fan failure

"Troubleshooting Method"

1, check whether the management has been loose, or did not plug in place;

2, if not plugged, reinstall the management card, and ensure that the plug in place, and then tighten the fixed screws;

3, if the plug is still unable to work, check the slot corresponding to the back of the connectors whether there is loose phenomenon and check the groove of the Guide is deformation;

4, if there is, you can switch to other slots to test.

5, if not slot and installation problems, need to replace the management card;

6, for the occurrence of the alarm LED is red phenomenon when there are problems with other modules of the system, you can observe other modules (such as wire cards, fans, power and the temperature of the system is too high) whether there is a fault alarm, if you should first exclude other modules of the fault. You can also verify the failure by logging in to the management software.

"Common fault four": Fan tray all fans do not turn

"Fault description"

The fan tray fan is not working or the power LED is not lit after the system is started.

"Probable cause."

Fan is damaged, fan is loose

"Troubleshooting Method"

1, to confirm the fan plate and backplane connection is reliable, the connection of the plug-in is loose;

2, if the connection is reliable, you need to replace the fan plate;

"Common failure Five": Serial console no output

"Fault description"

The serial console does not display any information after the system starts

"Probable cause."

Serial line mismatch, serial line damage, super terminal parameters are incorrect

"Troubleshooting Method"

1, the first to confirm whether the serial line has been connected, the serial line is disconnected, the serial line is able to apply the equipment;

2, the connection of the serial port and HyperTerminal on the configuration of the serial port is consistent;

3, observe HyperTerminal serial port configuration, and the equipment described in the same configuration parameters, such as the need to change the serial port configuration parameters;

4, confirm that the PC's control port can be used normally;

5, if the above determination can not be used, need to replace the board card;

"Common failure Six": Serial console output garbled

"Fault description"

Serial control console display garbled, unable to identify

"Probable cause."

Serial line mismatch, serial line damage, super terminal parameters are incorrect

"Troubleshooting Method"

1, the first to confirm whether the serial line has been connected, the serial line is disconnected, the serial line is able to apply the equipment;

2, the connection of the serial port and HyperTerminal on the configuration of the serial port is consistent;

3, observe HyperTerminal serial port configuration, and the equipment described in the same configuration parameters, such as the need to change the serial port configuration parameters;

4, confirm that the PC's control port can be used normally;

5, if the above determination can not be used, need to replace the board card

"Common failure Seven": New insert business Card module can not power

"Fault description"

The system is running normally, the newly inserted business Card module panel LED is all out and the port is not working properly

"Probable cause."

The business card is not plugged in, the host slot is damaged, and the power supply is insufficient

"Troubleshooting Method"

1, first confirm business card module is inserted into place;

2, the calculation of the newly inserted business card module plus the original system of all the modules of the total power to exceed the system power supply can provide maximum power;

3, if more than, please increase the Power module to provide sufficient power supply;

4, if the detection of all normal, the new Insert Business Card module still can not work, the new business card replacement slot on the test to see if it can be used;

5, if the replacement to other slots can not work properly, you need to replace the board card

"Common fault Eight": optical mouth can not link

"Fault description"

The system is running normally, the optical port inserts the light module, the fiber optic cable is connected well, cannot link

"Probable cause."

Incorrect configuration, wavelength of optical module at both ends, type inconsistency, cable damage

"Troubleshooting Method"

1, the first confirmation is photoelectric multiplexing mouth, if it is photoelectric multiplexing mouth, need to configure in the light port mode, you can show int view port status;

2, to confirm that the receiving and sending of fiber-optic cable is connected to the reverse, the port of the sender of the interface needs to be connected to another light port of the receiving end, if not confirmed, you can exchange two optical fiber lines in the optical module in the connection order to confirm;

3. Confirm that the wavelength of the optical module is consistent between the two sides, such as the optical module of 1310nm wavelength and the optical module of 1550nm wavelength is wrong;

4. Confirm whether the distance between the two sides exceeds the length of the optical module identification.

5, to confirm the speed of interconnection between the matching, fiber type compliance requirements, in addition, for the support of different rates of ports, you also need to verify that the port rate mode is configured correctly.

"Common failure Nine": POE part of the Port power supply, some ports do not power

"Fault description"

Line Kadangkou with Poe equipment, partial port power supply, partial port does not power

"Probable cause."

Configuration is incorrect, power supply is insufficient

"Troubleshooting Method"

1, verify that the port is not powered by the software manual shutdown;

2, to confirm Poe power supply is sufficient power, if not enough, the system will only be high priority port power supply;

3, if the following confirmation has no effect, need to replace the line card;

"Common failure 10": Power led appears normal, but system alarms

"Fault description"

Host two power supplies are powered up, the power LED is displayed normally, but through the system show POW shows one of the power is off and the management engine's warning light

"Probable cause."

Power supply is not plugged in, power supply and host socket, hole damage

"Troubleshooting Method"

1, confirm the power supply is not completed into the power slot;

2, unplug the power supply to detect the insertion part of the needle is broken, crooked and so on;

3, check the chassis power supply slot inside whether there is a hole plug phenomenon;

4, if none of the above problems, the need to replace the power module;

"Common failure 11": Fan Error

"Fault description"

The fan-disk fan power indicator is normal and all fans are spinning, but show fan shows that individual fans are not work states;

"Probable cause."

Fan disk, chassis back panel

"Troubleshooting Method"

1, to confirm the fan plate and backplane connection is reliable, the connection of the plug-in is loose;

2, the fan disk to another operation of the normal host test, if the system show fan results or error, indicating that the fan disk damage, otherwise the chassis backplane or line damage;

"Common failure 12": Engine has no output

"Fault description"

Power supply Normal, but not working, HyperTerminal without any output

"Probable cause."

Engine, Wire card

"Troubleshooting Method"

1, check whether the management engine is loose, not plugged in place;

2, observe the engine status indicator is bright red (normal should be green light), if bright red to determine engine failure;

3, observe the chassis on-line card status indicator is in the flashing or red state, if there is the first wire card pull-out, and then detect whether the equipment can be normal operation;

4, if the above three kinds of conditions are not abnormal, can be judged as a management engine failure;