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Chapter 9: Troubleshooting
206
Problem 6: The SHOW STACK command is not displaying all the
switches in the stack.
Solutions: The switches are unable to form the stack. Try the following:
The switch might have an earlier version of the management
software that does not support the stacking feature. The feature
requires v5.4.8-0.2 or later. To view the version number, use the
SHOW VERSION command.
Review the information in "Stacking Guidelines" on page 43 to
verify that the trunk complies with all rules and restrictions.
If the trunk is using fiber optic transceivers, verify that they are fully
inserted into the transceiver slots.
Verify that the transceivers are from Allied Telesis.
Verify that the fiber optic cables are securely connected to the
ports on the transceivers.
Verify that VCStack is activated on the switches. Refer to
"Verifying the Master Switch" on page 154 and "Verifying a
Member Switch" on page 161.
Problem 7: A line card port that was functioning as a stacking port is not
forwarding regular Ethernet traffic after the stacking function is removed.
You have to reboot the switch after changing a stacking port to a
regular Ethernet port.
Problem 8: The switch functions intermittently.
Solutions: Check the hardware status through the management software:
Use the SHOW SYSTEM ENVIRONMENT command in the
Privileged Exec mode to verify that the input voltage from the
power source to the switch is stable and within the approved
operating range. The unit will shut down if the input voltage
fluctuates above or below the approved operating range.
Use the SHOW SYSTEM ENVIRONMENT command in the
Privileged Exec mode to verify that the fan is operating correctly.
Verify that the location of the switch allows for adequate airflow.
The unit will shut down if it is overheating.
Problem 9: The Switch ID LED on the front panel is flashing the letter "F."
Solutions: One or more of the following problems has occurred:
A cooling fan has failed.
The internal temperature of the switch has exceeded the normal
operating range and the switch might have to shut down.
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