Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


Maintaining the MX960 Fan Trays


For optimum cooling, verify the condition of the fans.


  • 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:


The fan numbers are stamped into the fan tray sheet metal next to each fan.