Explanation/Reference:
The Oracle Enterprise Manager Grid Control Exadata Monitoring plug-in bundle allows you to monitor the following key components of Exadata machine:
Oracle ILOM: The plug-in monitors the Oracle ILOM card in a database server for hardware events and

records sensor data.
InifiniBand Switch: The plug-in enables Enterprise Manager Grid Control to monitor the Oracle

DataCenter36 Infiniband Switch.
Avocent MergePoint Unity Switch: The Plug-in enables Enterprise Manager Grid Control to monitor

KVM (keyboard, video or visual display unit, mouse) targets. The plug-in provides status of the KVM and the event occurrences like Factory Defaults Set, Fan Failure, Aggregated TargetDevice Status, Power Supply Failure, Power Supply Restored, Reboot Started, Temperature Out of Range on the KVM target.
Cisco Switch: The plug-in enables Enterprise Manager Grid Control to monitor Cisco Switch targets.

This plug-in will monitor the Cisco switch's CPU, memory, temperature, network interfaces, system information, fan, and power supply metrics.
Power Distribution Unit: The plug-in will be used to monitor PDU's actual current value of Phase1,

Phase2, and Phase3
References: http://www.oracle.com/technetwork/oem/grid-control/exadata-plug-in-bundle-188771.html