Maintaining the MX2020 Fan Trays

Purpose

For optimum cooling, verify the condition of the fans.

Action

• Monitor the status of the fans. The fan trays each contain 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 is triggered when a fan tray is removed. During normal operation, the fans in each fan tray function at normal speed.

• To display the status of the cooling system, issue the show chassis environment command, show chassis environment monitored command, show chassis temperature-thresholds command, or show chassis fan command.

  For the fan trays, the output for the show chassis environment command is similar to the following:

For monitoring the temperature of specific items in the MX2020 router, the output for the show chassis environment monitored command is similar to the following:

For the chassis temperature threshold settings, the output for the show chassis temperature-thresholds command is similar to the following:

For the fan trays, the output for the show chassis fan command is similar to the following:

Fan Tray 0, Fan Tray 1 refer to the lower rear fan trays, Fan Tray 2, and Fan Tray 3 refer to the upper rear fan trays.

Fan 1, Fan 2, Fan 3, Fan 4, Fan 5, and Fan 6 refer to the fans on the fan tray. There are six fans for each fan tray.