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Understanding Redundancy of QFX3600 and QFX3600-I Components and Functionality

The following hardware components provide redundancy on QFX3600 and QFX3600-I devices:

  • Power supplies—QFX3600 and QFX3600-I devices have two power supplies. Each power supply provides power to all components in the device. The two power supplies provide full power redundancy to the device. If one power supply fails or is removed, the second power supply balances the electrical load without interruption.

    To provide power redundancy to the system both power supplies must be installed. Connect power source feed A to one power supply and power source feed B to the second power supply.


    Do not connect feed A and feed B to the same power supply input terminal.

  • Cooling system—QFX3600 and QFX3600-I devices have three fan trays. If a fan module on a fan tray fails and is unable to keep the QFX3600 device within the desired temperature thresholds, chassis alarms occur and the device may shut down.