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6.1 | |
Starting the Switch | |
| 6.1.3 | |
Verifying port LEDs during switch POST |
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Once the power cable is connected, the
switch initiates a series of tests called the power-on self test
(POST). POST runs automatically to verify that the switch functions
correctly. The System LED indicates the success or failure of POST. If
the System LED is off but the switch is plugged in, then POST is
running. If the System LED is green, then POST was successful. If the
System LED is amber, then POST failed. POST failure is considered to
be a fatal error. Reliable operation of the switch should not be
expected if POST fails.
The Port Status LEDs also change during
switch POST. The Port Status LEDs turn amber for about 30 seconds as
the switch discovers the network topology and searches for loops. If
the Port Status LEDs turn green, the switch has established a link
between the port and a target, such as a computer. If the Port Status
LEDs turn off, the switch has determined that nothing is plugged into
the port.
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