We recently had an RMA for an EX4400 switch due to a PoE problem on ports 32 to 47, however when we receive the new unit it keeps rebooting every 10 min.

We already had 2 RMAs and both units had the same issue.

Checking the files, we notice that the fan modules are not present on the chassis:

root@> show chassis hardware detail no-forwarding

Hardware inventory:

Item Version Part number Serial number Description

Chassis ZA4723400000 EX4400-48P

Pseudo CB 0

Routing Engine 0 BUILTIN BUILTIN RE-EX4400-48P

FPC 0 REV 16 650-114383 ZA4723400000 EX4400-48P

CPU BUILTIN BUILTIN FPC CPU

PIC 0 REV 16 BUILTIN BUILTIN 48x10M/100M/1G

PIC 1 REV 16 650-114383 ZA47234000002x100G QSFP28 VCP

Power Supply 1 REV 01 640-107109 1EF2D200000 JPSU-1600-C-AC-AFO

Also, they are not seen in the enviroment output:

root@> show chassis environment no-forwarding

Class Item Status Measurement

Power FPC 0 Power Supply 0 Absent

FPC 0 Power Supply 1 OK 39 degrees C / 102 degrees F

Temp FPC 0 Main Board Sensor 1 OK 49 degrees C / 120 degrees F

FPC 0 Main Board Sensor 2 OK 50 degrees C / 122 degrees F

FPC 0 Main Board Sensor 3 OK 33 degrees C / 91 degrees F

FPC 0 Main Board Sensor 4 OK 36 degrees C / 96 degrees F

FPC 0 Main Board Sensor 5 OK 35 degrees C / 95 degrees F

FPC 0 Main Board Sensor 6 OK 37 degrees C / 98 degrees F

FPC 0 PFE Die Sensor OK 62 degrees C / 143 degrees F

FPC 0 CPU Die Sensor OK 48 degrees C / 118 degrees F

Fans FPC 0 Fan Tray 0 Fan 0 Absent

FPC 0 Fan Tray 0 Fan 1 Absent

FPC 0 Fan Tray 1 Fan 0 Absent

FPC 0 Fan Tray 1 Fan 1 Absent

The switch was overheating and that's why it was rebooting. After introducing the fans, the switch behaves normally.