Field Notice: FN74002 – Fans with new EEPROMs may not show up in Cisco 8000 Series Fixed Routers – Software Upgrade Recommended

Problem Description
Fans with new EEPROMs will not be recognized or function properly in Cisco 8000 Series Fixed Routers that are running older software. The fans in Cisco 8000 Series Fixed Routers use the EEPROM to store the product IDs (PIDs) of the fans and the description of the type of fan unit, such as port-side exhaust or air intake. These fans are field-replaceable units (FRUs).

The fans will not show in Cisco IOS XR Software if the EEPROM is not available or is incompatible. The fans in Cisco 8000 Series Fixed Routers require software SMU(s) to support the new EEPROM type. The fans with the new EEPROMs will not function until the SMU is loaded in the router. The fans that include this new EEPROM type will ship in April 2023. All new fans will ship from Manufacturing and will be stocked in the RMA Depots.

The PID for fans will remain the same. The new fans will use Hardware Version V02 IDs.

The fix is available by SMU or in Cisco IOS XR releases 7.8.2 and later as well as releases 7.9.1 and later.

Important: The production SMU is highly recommended for Cisco 8000 Series Fixed Routers that are running an affected release. If all fans in Cisco 8000 Series Fixed Routers use the new EEPROM and the SMU has not been applied, the affected routers may shut down.

This advisory can be found at the following link:
https://www.cisco.com/c/en/us/support/docs/field-notices/740/fn74002.html