Troubleshooting guide

2. Troubleshooting Switch Failures
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Table 2-4: Isolating the cause of power failures
2.2.2 Isolating the cause of external redundant power unit failures
Use the procedure described below to isolate the cause of the failure if a failure occurs on an EPU.
5 • The red ST1 LED of the switch blinks.
• The LINK LED (10GBASE-R or
1000BASE-X port) and the 1-48 LED
(10/100/1000BASE-T port) of ports on
the switch are lit in orange or off.
A problem has occurred on the switch or line.
1. For a redundant power model, check the status of the power
supply unit and fan unit. If a fault is found, replace the
applicable unit.
- If the ALM LED of the fan unit is lit in red, replace the fan
unit.
- If the ALM1 LED or ALM2 LED of the power supply unit is
lit in red, replace the power supply unit.
- If the POWER LED of the power supply unit is off, follow
the instructions in Table 2-4: Isolating the cause of power
failures to take action regarding the power failure. If the
POWER LED is still off, replace the power supply unit.
2. If step 1 above does not apply, check the error message and
take action accordingly. Use the
show logging command to
check the failure information and take action.
>show logging | grep ERR
If a fault has occurred on an external redundant power unit
(EPU), identify the problem by referring to 2.2.2 Isolating the
cause of external redundant power unit failures.
6 LED indications of the switch and EPU
show no abnormality, but the device
administrator command displays
EPU:Disconnect.
Make sure that the cable is properly connected between the switch
and EPU. If the cable is disconnected, follow the procedure below
to restart the switch:
1. Turn off the switch.
2. Properly connect the disconnected cable.
3. Turn on the switch.
No. Problem Action
1 The power switch of the switch (or of the power
supply unit for a redundant power model) is off.
Turn the power switch on.
2 The power cable is disconnected or loose. Perform the following procedure:
1. Turn the power switch off.
2. Connect the power cable correctly.
3. Turn the power switch on.
3 When a redundant power model is used, the
power supply unit is not firmly installed and is
unstable.
Perform the following procedure:
1. Turn the power switch off.
2. Install the power supply unit correctly.
3. Turn the power switch on.
4 The measured input power supply is outside the
following range:
For 100 V AC: 90 to 127 V AC
For 200 V AC: 180 to 254 V AC
For -48 V DC: -40.5 to -57 V DC
Note: Take this action only if the input power
supply can be measured.
Ask the person responsible for the facility where the switch is
housed to take action regarding the input power supply.
No. Problem Action