Cisco Catalyst 9400 Series Troubleshooting Manual
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Cisco Catalyst 9400 Series Troubleshooting Manual

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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
System Messages, on page 3
Troubleshooting
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Summary of Contents for Cisco Catalyst 9400 Series

  • Page 1: Table Of Contents

    Contacting the Cisco Technical Assistance Center, on page 14 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.

  • Page 2: Using Leds To Identify Startup Problems

    Watch for any system messages after startup. • That the power supplies are supplying power to the system The power supply’s LED should be green. Use the show environment Cisco IOS command to view power supply activity. • That the system fan assembly is operating Listen for fan activity.

  • Page 3: System Messages

    “Troubleshooting Switching Modules” section. If you determine that the switching module is not operating, contact Cisco TAC as described in the “Some Problems and Solutions” section. • If the boot information and system banner are not displayed, verify that the terminal is set for 9600 baud, 8 data bits, no parity, and 1 stop bit and connected properly to the console port.

  • Page 4: Troubleshooting A Power Supply Module

    Troubleshooting a Power Supply Module Troubleshooting a Power Supply Module Useful Cisco IOS Commands - Power Supply You may use the following Cisco IOS commands in the priviledged EXEC mode, to monitor the status, load, and activity of a power supply module. •...
  • Page 5 Troubleshooting Troubleshooting a DC-Input Power Supply may lie with the first power supply bay and not the power supply module. Call Cisco Technical Assistance Center (Cisco Support) for further instructions. b) If a second power supply is available, install it in the second power supply bay.
  • Page 6 If there is no damage, try installing it in another empty power supply bay, if available. Do not touch the back of the power supply module during this inspection. If the OUTPUT LED turns green, the problem may lie with the first power supply bay and not the power supply module. Call Cisco Technical Assistance Center (Cisco Support) for further instructions.

  • Page 7: Troubleshooting The Fan Tray Assembly

    Troubleshooting Troubleshooting the Fan Tray Assembly Condition Action Required to Restore Default Mode of the Power Button Only one power supply module 1. Switch off the DC circuit breaker for at least three seconds. is configured, and it is a 2.
  • Page 8 Verify that all fans are operating. You should hear the fans at system start. What to do next If the system is still detecting a fan assembly failure, check for details using the Cisco IOS commands, save the logs, and contact the Cisco TAC for assistance.

  • Page 9: Troubleshooting High Temperature Alarms

    Useful Cisco IOS Commands - Fan Tray Assembly Useful Cisco IOS Commands - Fan Tray Assembly You may use the following Cisco IOS commands in the priviledged EXEC mode, to diagnose fan tray problems. • To turn the blue beacons on:...

  • Page 10: Troubleshooting The Switching Module

    Each switching module has one STATUS LED that provides information about the module and one numbered PORT LINK LED for each port on the module. Refer to Cisco Catalyst 9400 Series Switching Module LEDs to determine the status of the LEDs.
  • Page 11 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.
  • Page 12 1. Ensure that the terminal configuration matches the switch console port speed configuration. The following example uses a Cisco switch as the console, and the console port number is 8. Enter the appropriate console port number when you configure the console port speed.
  • Page 13 Further, the current console port session speed is still set to 115200 and you still have access. 2. Boot the image—Cisco IOS boots the image normally. The line console speed is initially retrieved from BAUD (9600), but Cisco IOS parses the startup-configuration, and the speed is changed to 115200. This matches the current console port speed.

  • Page 14: Contacting The Cisco Technical Assistance Center

    If you are unable to solve a startup problem after using the troubleshooting suggestions in this chapter, contact a Cisco TAC representative for assistance and further instructions. Before you call, have the following information ready to help the Cisco TAC assist you as quickly as possible: • Date you received the switch •...

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