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Chapter 8

Troubleshooting
This chapter contains suggestions on how to troubleshoot the switch if a
problem occurs.
Note
For further assistance, please contact Allied Telesis Technical
Support. Refer to “Contacting Allied Telesis” on page 15.
Problem 1: The Stack ID LED on the front of the switch is off.
Solutions: The unit is not receiving power. Try the following:
Verify that the power cord is securely connected to the power
source and to the AC connector on the back panel of the switch.
Verify that the power outlet has power by connecting another
device
to it.
Try connecting the unit to another power source.
Try a different power cord.
Verify that the voltage from the power source is within the required
levels for your region.
Problem 2: The SHOW STACK command does not display all the
switches in the stack:
Solutions: You may have connected the stacking cables incorrectly or
switches may have duplicate stack ID numbers. To correct the problem, try
the following:
Verify that the stacking cables are properly connected to the S1
and S2 ports such that they crossover to different ports. For
instructions, refer to “Cabling the Stacking Ports” on page 87.
Examine the stack ID LEDs to verify that each switch is assigned a
unique ID number, in the range of 1 to 8. If there are switches with
duplicate numbers, power off the stack and perform the procedures
in Chapter 5, “Assigning the Stack ID Numbers and Cabling the
Stacking Ports” on page 79. (The stack ID number must be set
while the switch is functioning as a stand-alone unit.)