Znyx Networks bh5700 - Manual (Page 348)

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 I
2 C compatible serial interfaces:
I 2 C 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.
I 2 C Port 1 Connects to the Ethernet Switch Blade CPU and the “spare” SEEPROM.
I 2 C 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