After upgrading QFX5100 Virtual Chassis (2 qfx5100-96s and 1 qfx5100-24q) to 17.3R3-S4 Flex, the "show chassis environment" is not displaying the fan info for qfx5100-24q:
{master:0} root@QFX5100-VC> show chassis environment Class Item Status Measurement Power FPC 0 Power Supply 0 OK FPC 0 Power Supply 1 OK FPC 1 Power Supply 0 OK FPC 1 Power Supply 1 OK FPC 2 Power Supply 0 OK FPC 2 Power Supply 1 OK Temp FPC 0 Sensor TopMiddle E OK 30 degrees C / 86 degrees F FPC 0 Sensor TopRight I OK 28 degrees C / 82 degrees F FPC 0 Sensor TopLeft I OK 27 degrees C / 80 degrees F FPC 0 Sensor TopRight E OK 28 degrees C / 82 degrees F FPC 0 Sensor CPURight I OK 28 degrees C / 82 degrees F FPC 0 Sensor CPULeft I OK 28 degrees C / 82 degrees F FPC 0 Sensor Die Temp OK 38 degrees C / 100 degrees F FPC 1 Sensor TopMiddle E OK 29 degrees C / 84 degrees F FPC 1 Sensor TopRight I OK 27 degrees C / 80 degrees F FPC 1 Sensor TopLeft I OK 27 degrees C / 80 degrees F FPC 1 Sensor TopRight E OK 27 degrees C / 80 degrees F FPC 1 Sensor CPURight I OK 28 degrees C / 82 degrees F FPC 1 Sensor CPULeft I OK 28 degrees C / 82 degrees F FPC 1 Sensor Die Temp OK 40 degrees C / 104 degrees F FPC 1 Mezz Temp OK FPC 2 Sensor TopMiddle C OK 25 degrees C / 77 degrees F FPC 2 Sensor TopRight I OK 34 degrees C / 93 degrees F FPC 2 Sensor TopLeft I OK 28 degrees C / 82 degrees F FPC 2 Sensor TopRight C OK 30 degrees C / 86 degrees F FPC 2 Sensor CPURight C OK 33 degrees C / 91 degrees F FPC 2 Sensor CPULeft E OK 28 degrees C / 82 degrees F FPC 2 Sensor CPU Die Temp OK 35 degrees C / 95 degrees F FPC 2 Sensor QIC0 OK FPC 2 Sensor QIC1 Ok 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 FPC 1 Fan Tray 0 OK Spinning at normal speed FPC 1 Fan Tray 1 OK Spinning at normal speed FPC 1 Fan Tray 2 OK Spinning at normal speed {master:0} root@QFX5100-VC> show version | match "Model:|^Junos:" Model: qfx5100e-96s-8q Junos: 17.3R3-S4.2 flex Model: qfx5100e-96s-8q Junos: 17.3R3-S4.2 flex Model: qfx5100e-24q-2p Junos: 17.3R3-S4.2 flex {master:0} root@QFX5100-VC> show virtual-chassis Preprovisioned Virtual Chassis Virtual Chassis ID: 2e33.ab37.6388 Virtual Chassis Mode: Enabled Mstr Mixed Route Neighbor List Member ID Status Serial No Model prio Role Mode Mode ID Interface 0 (FPC 0) Prsnt VB3715060109 qfx5100e-96s-8q 129 Master* N VC 2 vcp-255/0/101 1 vcp-255/0/98 1 vcp-255/0/99 1 (FPC 1) Prsnt VB3715040135 qfx5100e-96s-8q 129 Backup N VC 2 vcp-255/0/101 0 vcp-255/0/98 0 vcp-255/0/99 2 (FPC 2) Prsnt TB3714120126 qfx5100e-24q-2p 0 Linecard N VC 1 vcp-255/1/0 0 vcp-255/1/1
This is a known issue in release 17.3R3-S4.2 flex code which does not display the fan info for QFX5100-24q. There is no way to obtain the fan information other than visually checking the fan status on the chassis. This missing information displays a fan status which does not mean there is a problem with the fan.
It is recommended to upgrade to the latest S5 release.