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Interpreting POST results
• Constructs unicast routing tables.
• Enables normal port operation.
Interpreting POST results
POST is a system check that is performed each time the device is powered on, rebooted, or reset.
During POST, the LEDs flash either amber or green. Any errors that occur during POST are listed in
the error log.
Complete the following steps to determine whether POST completed successfully and whether any
errors were detected.
1. Verify that the device LEDs indicate that all components are healthy.
Refer to "LED patterns" for descriptions and interpretations of LED patterns.
2. Verify that the device prompt displays on the terminal of a computer workstation connected to the
device.
If there is no device prompt when POST completes, press Enter. If the device prompt still does not
display, try opening a Telnet session or accessing the device through another management tool. If
this is not successful, the device did not successfully complete POST. Contact your service provider
for repair.
3. Review the device system log for errors. Any errors detected during POST are written to the system
log, accessible through the show logging raslog command.
For information about all referenced commands, and on accessing the error log, refer to the
Network OS Administration Guide. For information about error messages, refer to the Network OS
Message Reference.
Diagnostic tests
In addition to POST, the Network OS includes diagnostic tests to help you troubleshoot the hardware
and firmware. This includes tests of internal connections and circuitry, fixed media, and the
transceivers and cables in use.
The tests are implemented by command, either through a Telnet session or through a console set up
to the serial connection to the device. Some tests require the ports to be connected by external cables
to allow diagnostics to verify the serializer/deserializer interface, transceiver, and cable. Some tests
require loopback plugs. Refer to the Network OS Administration Guide and the Network OS Command
Reference for more details about diagnostic tests and commands.
Diagnostic tests run at link speeds of 1 or 10 Gbps depending on the speed of the link being tested
and the type of port.
NOTE
Diagnostic tests may temporarily lock the transmit and receive speed of the links during diagnostic
testing.
To monitor the transceivers, the show media command output provides transceiver information for all
interfaces on the device. Any unqualified transceiver is disabled and a log message is generated.
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Brocade VDX 6940 Hardware Installation Guide
53-1003495-02
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