This Article will discuss the critical system failures that can arise from fan failures.

• The customer has encountered the following critical error.

switch> show chassis alarms

3 alarms currently active

Alarm time Class Description

2024-11-12 11:08:47 UTC Major FPC 0 Fan 2 not spinning

2024-11-21 11:08:47 UTC Major FPC 0 Fan 1 not spinning

2024-11-21 11:08:47 UTC Major FPC 0 Fan 0 not spinning

• After the major error, switch power cycled unexpectedly. Alarms have cleared:-

Fans FPC 0 Fan Tray 0 OK Spinning at normal speed

FPC 0 Fan Tray 1 OK Spinning at normal speed

FPC 0 Fan Tray 2 OK Spinning at normal speed

• However, still shows with Failure status:

switch> show chassis fan

Nov 21 11:33:42

Item Status RPM Measurement

FPC 0 Tray 0 Fan 0 OK 7648 Failure

FPC 0 Tray 1 Fan 0 OK 7397 Failure

FPC 0 Tray 2 Fan 0 OK 7407 Failure

FPC 1 Tray 0 Fan 0 OK 5294 Spinning at normal speed

FPC 1 Tray 1 Fan 0 OK 5263 Spinning at normal speed

FPC 1 Tray 2 Fan 0 OK 5299 Spinning at normal speed

Reseated the fan. If the issue persists, determine if the fault lies with the fan itself or its slot. Swap the suspect fan with a known-working unit. If the issue follows the fan, the fan is faulty. If the issue remains with the slot, the slot may be defective. Open a TAC case for further assistance