Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


Maintaining the T4000 Fan Trays



For optimum cooling, verify the condition of the fans.


On a regular basis, monitor the status of the fans. The fan trays each contain multiple fans that work in unison to cool the router components. During normal operation, the status of each fan is OK, and the fans in each fan tray function at normal speed. Use the show chassis environment and show chassis fan commands to verify the status of the fans.