ipmitool

modprobe ipmi_devintf
modprobe ipmi_si
modprobe ipmi_msghandler

ipmitool -I open chassis status
Displays information regarding the high-level status of the system chassis and main power subsystem.

ipmitool -I open sdr list
This command will read the Sensor Data Records (SDR)

ipmitool -I open sel list
the entire contents of the System Event Log are displayed.

SuperMicro IPMI LAN interfaces

Dedicated: Always use the dedicated IPMI interface. This is the option you want if you're trying to have the simplest setup, at the expense of additional cabling.