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POST and boot specifications
POST and boot specifications
When the device is turned on or rebooted, the device performs a power-on, self-test (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 no diag post command to
persistently disable POST.
For more information about these commands, refer to the Extreme Network OS Command Reference.
POST
The success or failure results of the diagnostic tests that run during POST can be monitored through LED activity, the error log, or the
command line interface.
POST includes the following tasks:
•
Conducts preliminary POST diagnostics.
•
Initializes the operating system.
•
Initializes hardware.
•
Runs diagnostic tests on several functions, including circuitry, port functionality, memory, statistics counters, and serialization.
Boot
In addition to POST, boot includes the following tasks after POST is complete:
•
Performs port configuration.
•
Initializes links.
•
Analyzes fabric. If any ports are connected to other devices, the device participates in a fabric configuration.
•
Obtains a domain ID and assigns port addresses.
•
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.
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ExtremeSwitching VDX 6740 Hardware Installation Guide
9036108-00
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