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[QFX] Missing fan info for one member after upgrading to 17.3R3-S4 TVP

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Article ID: KB34888 KB Last Updated: 15 Apr 2020Version: 1.0
Summary:

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

Solution:

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. 

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