Boot Tasks; Interpreting Led Activity; Led Indicators - Cisco MDS 8/12c User Manual

3. Review the switch system log for errors. Any errors detected during POST are written to the system log,
accessible through the show logging logfile command. For information about all referenced
commands and accessing the error log and error messages, see the Cisco NX-OS System Messages
Reference.

Boot tasks

Boot completes in approximately three minutes if POST is run. Boot includes the following tasks after POST
completes:
• Universal port configuration
• Links initialized
• The fabric is analyzed, and if any ports are connected to other switches, the switch participates in a
fabric configuration
• The switch obtains a domain ID and assigns port addresses
• Unicast routing tables constructed
• Normal port operation enabled

Interpreting LED activity

You can monitor switch activity and status by checking the switch LEDs.
There are three possible LED states: no light, a steady light, or a flashing light. The steady lights and
flashing lights can be green or amber.
The LEDs flash any of these colors during boot, POST, or other diagnostic tests. This is normal and does
not indicate a problem unless the LEDs do not indicate a healthy state after all boot processes and
diagnostic tests are complete. A healthy state is indicated by a steady green light.

LED indicators

All the LEDs are located on the port side
Figure 7 Identifying LEDs
1 Unit ID (UID) LED
These LEDs are controlled by the OA and are used to indicate certain types of errors. The OA displays
any errors indicated by a LED. For more information about the OA, see the HP BladeSystem Onboard
Administrator User Guide.
24 4 Managing the Switch
(Figure
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2 Health ID LED
7).
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