Maintaining the MX960 Fan Trays
Purpose
For optimum cooling, verify the condition of the fans.
Action
Monitor the status of the fans. A fan tray contains multiple fans that work in unison to cool the router components. If one fan fails, the host subsystem adjusts the speed of the remaining fans to maintain proper cooling. A red alarm is triggered when a fan fails, and a yellow alarm and red alarm is triggered when a fan tray is removed.
To display the status of the cooling system, issue the show chassis environment command. The output is similar to the following:
user@host> show chassis environment Class Item Status Measurement Temp PEM 0 OK 40 degrees C / 104 degrees F PEM 1 Absent PEM 2 Absent PEM 3 OK 40 degrees C / 104 degrees F Routing Engine 0 OK 39 degrees C / 102 degrees F Routing Engine 1 OK 42 degrees C / 107 degrees F CB 0 Intake OK 26 degrees C / 78 degrees F CB 0 Exhaust A OK 27 degrees C / 80 degrees F CB 0 Exhaust B OK 27 degrees C / 80 degrees F CB 0 ACBC OK 26 degrees C / 78 degrees F CB 0 SF A OK 37 degrees C / 98 degrees F CB 0 SF B OK 35 degrees C / 95 degrees F CB 1 Intake OK 27 degrees C / 80 degrees F CB 1 Exhaust A OK 30 degrees C / 86 degrees F CB 1 Exhaust B OK 28 degrees C / 82 degrees F CB 1 ACBC OK 27 degrees C / 80 degrees F CB 1 SF A OK 36 degrees C / 96 degrees F CB 1 SF B OK 36 degrees C / 96 degrees F CB 2 Intake Absent CB 2 Exhaust A Absent CB 2 Exhaust B Absent CB 2 ACBC Absent CB 2 SF A Absent CB 2 SF B Absent FPC 2 Intake OK 22 degrees C / 71 degrees F FPC 2 Exhaust A OK 27 degrees C / 80 degrees F FPC 2 Exhaust B OK 33 degrees C / 91 degrees F FPC 2 I3 0 TSensor OK 33 degrees C / 91 degrees F FPC 2 I3 0 Chip OK 35 degrees C / 95 degrees F FPC 2 I3 1 TSensor OK 33 degrees C / 91 degrees F FPC 2 I3 1 Chip OK 33 degrees C / 91 degrees F FPC 2 I3 2 TSensor OK 33 degrees C / 91 degrees F FPC 2 I3 2 Chip OK 30 degrees C / 86 degrees F FPC 2 I3 3 TSensor OK 30 degrees C / 86 degrees F FPC 2 I3 3 Chip OK 30 degrees C / 86 degrees F FPC 2 IA 0 TSensor OK 33 degrees C / 91 degrees F FPC 2 IA 0 Chip OK 36 degrees C / 96 degrees F FPC 2 IA 1 TSensor OK 30 degrees C / 86 degrees F FPC 2 IA 1 Chip OK 35 degrees C / 95 degrees F FPC 4 Intake OK 22 degrees C / 71 degrees F FPC 4 Exhaust A OK 28 degrees C / 82 degrees F FPC 4 Exhaust B OK 31 degrees C / 87 degrees F FPC 4 I3 0 TSensor OK 31 degrees C / 87 degrees F FPC 4 I3 0 Chip OK 34 degrees C / 93 degrees F FPC 4 I3 1 TSensor OK 31 degrees C / 87 degrees F FPC 4 I3 1 Chip OK 33 degrees C / 91 degrees F FPC 4 I3 2 TSensor OK 31 degrees C / 87 degrees F FPC 4 I3 2 Chip OK 29 degrees C / 84 degrees F FPC 4 I3 3 TSensor OK 29 degrees C / 84 degrees F FPC 4 I3 3 Chip OK 29 degrees C / 84 degrees F FPC 4 IA 0 TSensor OK 35 degrees C / 95 degrees F FPC 4 IA 0 Chip OK 37 degrees C / 98 degrees F FPC 4 IA 1 TSensor OK 31 degrees C / 87 degrees F FPC 4 IA 1 Chip OK 35 degrees C / 95 degrees F FPC 7 Intake OK 20 degrees C / 68 degrees F FPC 7 Exhaust A OK 21 degrees C / 69 degrees F FPC 7 Exhaust B OK 21 degrees C / 69 degrees F FPC 7 I3 0 TSensor OK 31 degrees C / 87 degrees F FPC 7 I3 0 Chip OK 36 degrees C / 96 degrees F FPC 7 I3 1 TSensor OK 32 degrees C / 89 degrees F FPC 7 I3 1 Chip OK 35 degrees C / 95 degrees F FPC 7 I3 2 TSensor OK 32 degrees C / 89 degrees F FPC 7 I3 2 Chip OK 30 degrees C / 86 degrees F FPC 7 I3 3 TSensor OK 30 degrees C / 86 degrees F FPC 7 I3 3 Chip OK 31 degrees C / 87 degrees F FPC 7 IA 0 TSensor OK 34 degrees C / 93 degrees F FPC 7 IA 0 Chip OK 37 degrees C / 98 degrees F FPC 7 IA 1 TSensor OK 31 degrees C / 87 degrees F FPC 7 IA 1 Chip OK 35 degrees C / 95 degrees F Fans Top Fan Tray Temp OK 27 degrees C / 80 degrees F Top Tray Fan 1 OK Spinning at high speed Top Tray Fan 2 OK Spinning at high speed Top Tray Fan 3 OK Spinning at high speed Top Tray Fan 4 OK Spinning at high speed Top Tray Fan 5 OK Spinning at high speed Top Tray Fan 6 OK Spinning at high speed Bottom Fan Tray Temp OK 28 degrees C / 82 degrees F Bottom Tray Fan 1 OK Spinning at high speed Bottom Tray Fan 2 OK Spinning at high speed Bottom Tray Fan 3 OK Spinning at high speed Bottom Tray Fan 4 OK Spinning at high speed Bottom Tray Fan 5 OK Spinning at high speed Bottom Tray Fan 6 OK Spinning at high speed
Note:
The fan numbers are stamped into the fan tray sheet metal next to each fan.