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Switch 4500 — Front View Detail 17
Unit LED The Unit LED is a seven segment display visible on the front of the Switch.
The Unit LED can be used to indicate the unit number in a fabric, POST
test ID and software upgrade information. In the unlikely event of a
hardware fault occurring, the Unit LED may be used to help diagnose the
problem. For information on using the Unit LED for problem solving, see
“Solving Problems Indicated by LEDs” on page 64
LEDs Table 4 lists LEDs visible on the front of the Switch, and how to read their
status. For information on using the LEDs for problem solving, see
“Solving Problems Indicated by LEDs” on page 64.
Table 4 LED Behavior
LED Color Indicates
Unit LED
Green Power On Self Test (POST) is in progress. During POST a the
test ID number appears in the Unit LED (seven segment
display).
or
Software download is in progress. During software
download, a clockwise cycling bar appears in the Unit LED.
Green flashing The Switch has failed POST. The Unit LED flashes the
number of the test that has failed.
Green flashing ‘f’ There has been a fan failure.
Green flashing ‘t’ The Switch is over temperature and unit temperature is
critical.
PWR LED
Green The Switch is powered-up and operating normally.
Green flashing Self Test (POST) or Software Download is in progress.
Yellow flashing One or more ports have failed POST.
Red The Switch has failed its Power On Self Test.
Off The Switch is not receiving power or there is a fault with the
Power Supply Unit.
Mode LED (3CR17571-91 and 3CR17572-91 only)
Speed Green 10/100 Port Speed and Activity, 1000 SFP Status and
Activity, or Stack Status and Activity.
Duplex Yellow 10/100 Duplex and Activity, 1000 SFP Duplex and Activity,
or Stack Activity
PoE Red 10/100 Port showing PoE Information