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Chapter 10: Troubleshooting
118
— 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.
If the PSU LED is not lit, then for DC power supply modules:
— Verify whether the PSU is receiving power. For example, listen
for whether the fan is running, or measure the voltage.
— Verify that the PSU has been correctly wired to the power
source. See “Power Wiring to a DC AT-PWR250R-80 Power
Supply Module” on page 69.
— Verify that the voltage from the power source is within the
required levels for the PSU.
Problem 2: All the port LEDs are off even though the ports are connected
to active network devices.
Solution: The switch may be operating in the low power mode. To toggle
on the LEDs, press the eco-friendly button on the front panel of the switch.
You may also toggle the LEDs off and on with the ECOFRIENDLY LED
and NO ECOFRIENDLY LED commands in the command line interface.
Problem 3: The SHOW STACK command is not displaying all the
switches in the stack.
Solutions: One or more switches cannot join the stack. Try the following:
Verify that the stacking transceivers in the S1 and S2 slots of the
switches are properly cabled. The stacking cables must crossover
to different slots on the switches. For instructions, refer to Chapter
7, “Cabling the Stacking Ports” on page 91.
Verify that the transceivers are fully inserted into the S1 and S2
slots.
Verify that VCStack is activated on the switches. For instructions,
refer to Chapter 6, “Verifying the Status of VCStack and Activating
VCStack” on page 85.
It could be that the switches have incompatible versions of the
management software. When a stack forms or a new switch is
added to an existing stack, the master switch downloads its
management software to member switches that do not have the
same version. If the master switch encounters a problem
downloading the management software to a member switch, it
does not allow the device to join the stack.