Znyx Networks bh5700 manual Appendix C Intelligent Platform Management Interface, States

Appendix C Intelligent Platform Management Interface

The Ethernet Switch Blade provides Intelligent Platform Management Interface (IPMI) support. IPMI circuitry provides:

•The communication channel between the Baseboard Management Controller (BMC) and the CPU for management.

•Data storage, SDRR, FRU, access.

•Sensor readings.

IPMI circuitry on the Ethernet Switch Blade peripheral management controller (PMC) provides three I2C compatible serial interfaces:

I2C Port 0 Connects to the BMC on an Alarm or System card. The bus is called IPMB. Via this connection the PMC can send status events, SDR ’s and FRU information to the BMC. It can also receive commands and control information from the BMC.

I2C Port 1 Connects to the Ethernet Switch Blade CPU and the “spare” SEEPROM.

I2C Port 2 Connects to the boot and run time SEEPROMs as well as the switch silicon.

ISwitch-ShMC Interaction

•Switch reports state changes to ShMC.

•If event reporting is enabled, an event will be generated by the switch whenever a sensor threshold is crossed.

•Policy is enforced by the ShMC.

•Typical ShMC policy is to remove back-end power from a FRU that has crossed a threshold.

M States

M0	No power and hot swap handle open
M1	No communications. (Wait in M1 until hot swap ejector is closed)
M2	FRU announces its presence to the ShMC and awaits activation permission
M3	Activation
M4	Operational state (command issued to enable back-end power)

Ethernet Switch Blade User's Guide release 3.2.2j page 348