Troubleshooting; About This Section; System Boot Verification - Cisco Catalyst 9400 Series Hardware Installation Manual

Troubleshooting

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About this Section

This chapter describes how to perform basic troubleshooting on Cisco Catalyst 9400 Series Switches. Problems
with the initial startup are often caused by a switching module that has become dislodged from the backplane
or a power cord that is disconnected from the power supply.
Although temperature conditions above the maximum acceptable level rarely occur at initial startup, some
environmental monitoring functions are included in this chapter because they also monitor power supply
output voltages.
Note This chapter covers only the chassis component hardware aspects of troubleshooting. For software configuration
issues, refer to the software configuration guide

System Boot Verification

When the initial system boot is complete, verify the following:
• That the system software boots successfully
About this Section, on page 129
System Boot Verification, on page 129
Using LEDs to Identify Startup Problems, on page 130
System Messages, on page 131
Troubleshooting with Software , on page 131
Troubleshooting a Power Supply Module, on page 132
Troubleshooting the Fan Tray Assembly, on page 135
Troubleshooting High Temperature Alarms , on page 137
Troubleshooting the Switching Module, on page 138
Troubleshooting Supervisor Modules, on page 138
Contacting the Cisco Technical Assistance Center, on page 142
C H A P T E R
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
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