This article explains the meaning of the syslog message, 'FPC 0 Airflow direction of PSU and Chassis fan are not matching' on EX series devices.
'FPC 0 Airflow direction of PSU and Chassis fan are not matching'
Active alarm:
user@host> show chassis alarms no-forwarding 1 alarms currently active Alarm time Class Description 2019-07-11 15:06:25 UTC Major FPC 0 Airflow direction of PSU and Chassis fan are not matching
2019-07-11 15:06:25 UTC Major FPC 0 Airflow direction of PSU and Chassis fan are not matching
Syslog Message:
Sep 13 06:57:48 send: red alarm set, device FPC 0, reason FPC 0 Airflow direction of PSU and Chassis fan are not matching Sep 13 07:11:13 fpc 0: new port map received pic slot 0
Example Hardware Inventory:
user@host> show chassis hardware Sep 11 11:10:21 Hardware inventory: Item Version Part number Serial number Description Chassis XXXXXXXXXXXX EX4550-32F Power Supply 0 REV 03 740-038949 XXXXXXXXXXX JPSU-650W-DC-AFI <-- Both Power supplies are of different airflow direction type (AFI and AFO) Power Supply 1 REV 04 740-043886 XXXXXXXXXXX JPSU-650W-DC-AFO Fan Tray Fan Module, Airflow In (AFI)
OR
user@host> show chassis hardware Sep 11 11:10:21 Hardware inventory: Item Version Part number Serial number Description Chassis XXXXXXXXXXXX EX4550-32F Power Supply 0 REV 03 740-038949 XXXXXXXXXXX JPSU-650W-DC-AF0 Power Supply 1 REV 04 740-043886 XXXXXXXXXXX JPSU-650W-DC-AFO Fan Tray Fan Module, Airflow In (AFI) <-- Power Supplies are AFO type and Fan Module is AFI type
AFI means Air Flow In (Back to Front Airflow movement) and AFO means Air Flow Out (Front to Back Airflow movement). AFI is also called Reverse Airflow and AFO is called Forward Airflow. See below for example output:
Power Supply 0 REV 01 740-043832 Exx PS 1000W AC REVERSE AIR FLOW CONTROL Power Supply 1 REV 01 740-044237 Exx PS 1000W AC FORWARD AIR FLOW CONTROL
Example Chassis Environment:
user@host> show chassis environment Sep 11 10:48:34 Class Item Status Measurement Power FPC 0 Power Supply 0 OK FPC 0 Power Supply 0 Airflow OK Back to front <-- Mismatch FPC 0 Power Supply 1 OK FPC 0 Power Supply 1 Airflow OK Front to back <-- Mismatch
Temp FPC 0 CPU OK 27 degrees C / 80 degrees F FPC 0 GEPHY Front Left OK 37 degrees C / 98 degrees F FPC 0 GEPHY Front Middle OK 45 degrees C / 113 degrees F FPC 0 GEPHY Front Right OK 44 degrees C / 111 degrees F FPC 0 EX-PFE1 OK 41 degrees C / 105 degrees F FPC 0 Rear Left PCB OK 27 degrees C / 80 degrees F FPC 0 Rear Middle PCB OK 37 degrees C / 98 degrees F FPC 0 Rear Right PCB OK 32 degrees C / 89 degrees F FPC 0 PIC1 OK 46 degrees C / 114 degrees F FPC 0 PIC2 OK 37 degrees C / 98 degrees F FPC 0 Local Sensor OK 26 degrees C / 78 degrees F Fans FPC 0 Fan 1 OK Spinning at normal speed FPC 0 Fan 2 OK Spinning at normal speed FPC 0 Fan 3 OK Spinning at normal speed FPC 0 Fan 1 Airflow OK Airflow In (AFI) <-- Indicates Back to Front Air Movement FPC 0 Fan 2 Airflow OK Airflow In (AFI) FPC 0 Fan 3 Airflow OK Airflow In (AFI)
Ideally, a system cannot have AFI and AFO components installed together to work as one whole unit. When PSUs are mixed up or when the PSU type does not match the chassis type, then this issue will occur. In that case, make sure you install the right kind of PSU/ Fans into the slots of a chassis.
If a chassis has all the correct types of PSUs and Fan Trays but you still see the error, then contact JTAC for further analysis.