Checking the Cooling System Status

For the cooling system to operate properly, the clearance around the chassis must be sufficient for unobstructed airflow. For clearance and maintenance requirements, see the appropriate router hardware guide.

Action

To check the cooling system status, use the following JUNOS command-line interface (CLI) operational mode command:

user@host> show chassis environment 

Sample Output

For M5 and M10 routers (see also Figure 105):

user@host> show chassis environment

Class Item                   Status     Measurement

[...Output truncated...]

Fans  Left Fan 1             OK         Spinning at normal speed

      Left Fan 2             OK         Spinning at normal speed

      Left Fan 3             OK         Spinning at normal speed

      Left Fan 4             OK         Spinning at normal speed

Misc  Craft Interface        OK        

For M7i routers (see also Figure 106):

user@host> show chassis environment

Class Item                   Status     Measurement

[...Output truncated...]

Fans  Fan 1                  OK         Spinning at normal speed

      Fan 2                  OK         Spinning at normal speed

      Fan 3                  OK         Spinning at normal speed

      Fan 4                  OK         Spinning at normal speed

For M10i routers (see also Figure 107):

user@host> show chassis environment

Class Item                   Status     Measurement

[...Output truncated...]

Fans  Fan Tray 0 Fan 1       OK         Spinning at normal speed

      Fan Tray 0 Fan 2       OK         Spinning at normal speed

      Fan Tray 0 Fan 3       OK         Spinning at normal speed

      Fan Tray 0 Fan 4       OK         Spinning at normal speed

      Fan Tray 0 Fan 5       OK         Spinning at normal speed

      Fan Tray 0 Fan 6       OK         Spinning at normal speed

      Fan Tray 0 Fan 7       OK         Spinning at normal speed

      Fan Tray 0 Fan 8       OK         Spinning at normal speed

      Fan Tray 1 Fan 1       OK         Spinning at normal speed

      Fan Tray 1 Fan 2       OK         Spinning at normal speed

      Fan Tray 1 Fan 3       OK         Spinning at normal speed

      Fan Tray 1 Fan 4       OK         Spinning at normal speed

      Fan Tray 1 Fan 5       OK         Spinning at normal speed

      Fan Tray 1 Fan 6       OK         Spinning at normal speed

      Fan Tray 1 Fan 7       OK         Spinning at normal speed

      Fan Tray 1 Fan 8       OK         Spinning at normal speed

For an M20 router (see also Figure 109):

user@host> show chassis environment

Class Item                   Status     Measurement

[...Output truncated...]

Fans  Rear Fan               OK         Spinning at normal speed

      Front Upper Fan        OK         Spinning at normal speed

      Front Middle Fan       OK         Spinning at normal speed

      Front Bottom Fan       OK         Spinning at normal speed

Misc  Craft Interface        OK        

For an M40 router (see also Figure 112):

user@host> show chassis environment

Class Item                   Status     Measurement

[...Output truncated...]

Fans  Top Impeller           OK         Spinning at normal speed

      Bottom impeller        OK         Spinning at normal speed

      Rear Left Fan          OK         Spinning at normal speed

      Rear Center Fan        OK         Spinning at normal speed

      Rear Right Fan         OK         Spinning at normal speed

Misc  Craft Interface        OK        

For M40e and M160 routers (see also Figure 114):

user@host> show chassis environment

Class Item                   Status     Measurement

[...Output truncated...]

Fans  Rear Bottom Blower     OK         Spinning at normal speed

      Rear Top Blower        OK         Spinning at normal speed

      Front Top Blower       OK         Spinning at normal speed

      Fan Tray Rear Left     OK         Spinning at normal speed

      Fan Tray Rear Right    OK         Spinning at normal speed

      Fan Tray Front Left    OK         Spinning at normal speed

      Fan Tray Front Right   OK         Spinning at normal speed

Misc  CIP                    OK        

For M320 routers (see also Figure 116):

user@host> show chassis environment

Class Item                   Status     Measurement

Fan   Top Left Front fan     OK         Spinning at normal speed

      Top Right Rear fan     OK         Spinning at normal speed

      Top Right Front fan    OK         Spinning at normal speed

      Top Left Rear fan      OK         Spinning at normal speed

      Bottom Left Front fan  OK         Spinning at normal speed

      Bottom Right Rear fan  OK         Spinning at normal speed

      Bottom Right Front fan OK         Spinning at normal speed

      Bottom Left Rear fan   OK         Spinning at normal speed

      Rear Fan 1 (TOP)       OK         Spinning at normal speed

      Rear Fan 2             OK         Spinning at normal speed

      Rear Fan 3             OK         Spinning at normal speed

      Rear Fan 4             OK         Spinning at normal speed

      Rear Fan 5             OK         Spinning at normal speed

      Rear Fan 6             OK         Spinning at normal speed

      Rear Fan 7 (Bottom)    OK         Spinning at normal speed

For T320 routers and T640 routing nodes (see also Figure 118, Figure 117, Figure 119, and Figure 120):

user@host> show chassis environment

Class Item                   Status     Measurement

Fans  Top Left Front fan     OK         Spinning at normal speed

      Top Left Middle fan    OK         Spinning at normal speed

      Top Left Rear fan      OK         Spinning at normal speed

      Top Right Front fan    OK         Spinning at normal speed

      Top Right Middle fan   OK         Spinning at normal speed

      Top Right Rear fan     OK         Spinning at normal speed

      Bottom Left Front fan  OK         Spinning at normal speed

      Bottom Left Middle fan OK         Spinning at normal speed

      Bottom Left Rear fan   OK         Spinning at normal speed

      Bottom Right Front fan OK         Spinning at normal speed

      Bottom Right Middle fan OK        Spinning at normal speed

      Bottom Right Rear fan  OK         Spinning at normal speed

      Fourth Blower from top OK         Spinning at normal speed

      Bottom Blower          OK         Spinning at normal speed

      Middle Blower          OK         Spinning at normal speed

      Top Blower             OK         Spinning at normal speed

      Second Blower from top OK         Spinning at normal speed

What It Means

The command output shows the fans, impellers, or blowers monitored for the router type. The command output displays the fan, impeller, or blower status and the spinning speed. Top Left and Top Right refer to fans in the upper front fan tray; Bottom Left and Bottom Right refer to fans in the lower front fan tray; Blower refers to fans in the rear fan tray. The status can be OK, Testing (during initial power-on), Failed, or Absent. Measurement indicates if the fan or impeller is spinning at normal or high speed.