Troubleshooting guide

2. Troubleshooting Switch Failures
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Table 2-2 Action to take when the Switch stops and the PWR LED turns off
No. Failure description Action
1 The power button of the Switch is off. Turn on the Switch.
2 The power cable is disconnected or
loose.
Perform the following procedure:
1. Turn off the Switch.
2. Connect the power cable correctly.
3. Turn on the Switch.
3 The measured input voltage is outside
the following range:
For 100 V AC: 90 to 127 V AC
For 200 V AC: 180 to 254 V AC
Note: Take this action only if the input
voltage can be measured.
This is a power facility failure (not a Switch failure). Ask the
person responsible for the facility to take action.
(2) Action to take when the red ST1 LED blinks and the LINK LED turns off
Take action according to the following table.
Table 2-3 Action to take when the red ST1 LED blinks and the LINK LED is off
No. Failure description Action
1 When failure information can
be checked by executing the
show logging operation
command as follows:
>show logging
Take action according to the failure information (see the manual
Message Log Reference). More specifically, take the following actions:
1. Replace the Switch.
2. Replace the transceiver (SFP).
3. Modify the configuration.
4. Replace the software.
5. Check the cable connection.
6. Check the status of the installed transceiver (SFP).
7. Additional Information
2 When failure information
cannot be checked
Replace the Switch.