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3
POST and boot specifications
TABLE 1
LED Name
Port Status
POST and boot specifications
When the switch is turned on or rebooted, the switch performs POST. Total boot time with POST can
be several minutes. POST can be omitted after subsequent reboots by using the fastboot command
or entering the diagDisablePost command to persistently disable POST.
For more information about these commands, refer to the Fabric OS Command Reference Manual.
POST
The success or failure results of the diagnostic tests that run during POST can be monitored
through the error log or the command line interface.
POST includes the following tasks:
1. Conducts preliminary POST diagnostics.
2. Initializes the operating system.
3. Initializes hardware.
20
Brocade 5100 LED Patterns During Normal Operation (Continued)
LED Color
Status of Hardware
No light
No signal or light carrier (media or
cable) detected.
Slow flashing
Port is online but segmented
green (flashing in
because of a loopback cable or
two-second
incompatible switch connection.
intervals)
Fast flashing green
Port is online and an internal
(flashing in
loopback diagnostic test is running.
half-second
intervals)
Flickering green
Port is online and frames are flowing
(steady with
through the port.
random flashes)
Steady green
Port is online (connected to external
device) but has no traffic.
Slow flashing
Port is disabled (because of
amber (flashing in
diagnostics or the portDisable
two-second
command).
intervals)
Fast flashing
Port is faulty.
amber (flashing in
half-second
intervals)
Steady amber (for
Port is receiving light or signal carrier
more than five
at 4 Gbps; but is not yet online.
seconds)
Recommended Action
Check transceiver and cable.
No action required.
No action required.
No action required.
No action required.
Verify the diagnostic tests are not
running. Reenable the port using the
portEnable command.
Check the management interface
and the error log for details on the
cause of status.
Contact Technical Support if
required.
No action required.
Brocade 5100 Hardware Reference Manual
53-1000854-02
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