Field Notice: FN74406 - Nexus N9K-C93108TC-FX3 Fails to Boot After Reload(s) or Keeps Rebooting - Hardware Upgrade Available

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Updated:November 4, 2026
Document ID:FN74406

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High
Impact Rating:
High
First Published:
2026-Nov-04
Last Published:
2026-Nov-04
Revision:
1.0
Cisco Bug IDs:

Notice

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Products Affected


Affected Product Name Description Comments
N9K-C93108TC-FX3 Nexus 9300 with 48p 100M/1/10GT & 6p 40/100G QSFP28+  




Defect Information


Defect IDHeadline
CSCwu08325Nexus N9K-C93108TC-FX3 switch fails to boot after reload or reloads intermittently

Problem Description


Cisco Nexus N9K-C93108TC-FX3 Switches may fail to boot after unexpectedly reloading or continue to reload multiple times. When affected switches do not reload and complete the bootup process, no output is observed on the console. The device remains unresponsive and does not proceed to the loader prompt, BIOS prompt, or NX-OS boot sequence.

The system cannot be recovered through software remediation, patch installation, or a Cisco ACI or NX-OS software upgrade.


Background


Once this issue occurs, standard troubleshooting methods such as reload attempts, software recovery, or boot variable validation do not restore functionality.

Note: The overall observed failure rate for the switches deployed in the field is considered low.


Problem Symptom


Cisco Nexus N9K-C93108TC-FX3 Switches may fail to boot up after a reload or may continue to reload unexpectedly. In these situations, no console output is observed. This causes failure of operations such as normal switch startup, access to the loader prompt, BIOS initialization visibility, console-based troubleshooting, and NX-OS boot sequence recovery.

Customers may observe:

  • Blank console after reload
  • No POST messages
  • No loader prompt
  • No BIOS prompt

If the switch continues to reload unexpectedly, the following reset reason will display during the short time that the switch is up:

  "show system reset-reason"
  ----- reset reason for module 1 (from Supervisor in slot 1) ---
  
             1) At 637162 usecs after <date + time will show here>
                   Reason: Module PowerCycled 
                  Service: HW check by card-client 
                  Version:

Workaround/Solution


Workaround:
There is no software, configuration, or firmware workaround available. Repeated power cycling will not permanently restore the device.

Solution:
Customers with an affected switch exhibiting this failure signature must replace the unit through the standard Return Material Authorization (RMA) process once verified by the Cisco Technical Assistance Center (TAC). Open a service request with Cisco Support Case Manager (SCM) referencing this Field Notice and defect tracking information.

Note: Software upgrades/downgrades, BIOS re-flashing, or Solid State Drive (SSD) replacements do not resolve this hardware failure.

Defective material should be returned within 10 days of receipt of replacement material.


How to Identify Affected Products


To identify affected products, use the Serial Number Validator.

For PID validation, the affected PID is N9K-C93108TC-FX3.


Additional Information


Before proceeding with the RMA, confirm the following:

  • There is no console output after the switch has reloaded unexpectedly, or the switch is unexpectedly rebooting multiple times with the reset reason that is mentioned in the Problem Symptoms section of this field notice.
  • The issue is on PID N9K-C93108TC-FX3.
  • Standard recovery methods have been unsuccessful.

Once confirmed, proceed with hardware replacement.

No software remediation is available.


Serial Number Validation


The Cisco AI Assistant for Support can help verify whether a device is impacted by the issue that is described in this Field Notice. To check the device, enter the serial number in the following URL: Cisco AI Assistant for Support

Upgrade Program Information


Support Case Manager (SCM) must be used for ordering replacement parts for this Field Notice. To open SCM in a new tab, click the following link:
https://mycase.cloudapps.cisco.com/fieldnotice?fn=FN74406

SCM will validate eligibility and ensure that a request for a particular serial number has not already been submitted. If there is already a request, SCM will indicate that an RMA has already been submitted and NOT eligible for replacement.

Provide the following information:

  1. Affected serial numbers. Note that a serial number entitlement check may be performed.
  2. One ship-to address per request.
  3. Service Request number (SR#). This is not required, but if one exists, enter it for better tracking purposes.

Order entry supports up to 50 serial numbers per request. For more than 50, submit additional requests.

For questions about order status, see the Field Notice Affected Hardware Replacement FAQ.

Revision History


VersionDescriptionSectionDate
1.0Initial Release—2026-NOV-04

For More Information

For further assistance or for more information about this field notice, contact the Cisco Technical Assistance Center (TAC) using one of the following methods:

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