Switch Self Reset; Cannot Connect To A Switch Through The Console Port - Cisco Catalyst 9400 Series Hardware Installation Manual

Troubleshooting
• Make sure that these configurations are synchronized between the active and redundant supervisor
If a software upgrade is performed on both the active and standby supervisor module, verify that both supervisor
modules are running the same new software image. If the software images are not the same, upgrade the
software image. Use the procedure in the software configuration guide for your release.
If the standby supervisor still does not come on line, create a service request with Cisco Technical Support.
Use the log of the switch output that you collected from the previous troubleshooting steps.

Switch Self Reset

If the switch has reset or rebooted on its own, verify that the power source for the switch did not fail. If you
use an uninterruptable power supply (UPS), make sure that the UPS does not have any problems.
The switch might have had a software crash. Enter the more crashinfo:data command to display the crash
information including date and time of the last time that the switch crashed. To display the standby supervisor
engine crash data, enter the more slavecrashinfo:data command. Crash data is not present if the switch has
not crashed.
If the output indicates a software crash at the time that you suspect that the switch rebooted, the problem can
be something other than a hardware failure. Contact Cisco Technical Support with the output of these
commands:
• show tech-support
• show logging
• more crashinfo:data

Cannot Connect to a Switch Through the Console Port

Make sure you are using the correct type of cable and that the cable pinouts are correct for your supervisor
module
Make sure the terminal configuration matches the switch console port configuration—default console port
settings are 9600 baud, 8 data bits, no parity, 1 stop bit.
To access the switch through the console port, the following must match
• The BAUD environment variable in the ROMMON
In order to determine whether the standby supervisor module is faulty, enter the redundancy reload
peer command from the active supervisor and through the console to the standby supervisor. Observe
the bootup sequence in order to identify any hardware failures. Currently, the active supervisor module
cannot access the power-on diagnostics results of the standby supervisor module.
modules:
• Startup configuration
• Boot variable
• Configuration register
• Calendar
• VLAN database
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
Switch Self Reset
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