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iRMC S2/S3 27
IPMI - technical background
Of the two ports that RCMP uses under UDP, the BMC communicates with the
LAN controller via port 623 (primary RMCP Port).
Figure 4: BMC and LAN controller
Serial Over LAN interface (SOL)
“Serial Over LAN” is an interface compliant with the IPMI V2.0 standard, which
controls transfer of serial data over a LAN connection. In particular, SOL
specifies the packet formats and protocols for transferring serial data streams
over a LAN between the serial controller on the managed computer and a
remote workstation. SOL is based on the IPMI-over-LAN specification.
In order to establish an SOL connection, a remote management application first
initiates an IPMI-over-LAN session with the BMC. After this has been done, the
SOL services can be activated from the remote workstation. The data traffic
between the serial controller and the remote workstation is handled over the
same IPMI session as the IPMI commands.
As soon as an SOL connection has been established, data transfer between the
serial controller and the remote workstation is carried out as follows:
– Transfer from the serial controller to the remote workstation:
The data stream issued by the serial controller is partitioned by the BMC,
packaged and then sent to the remote workstation over the LAN.
– Transfer from the remote workstation to the serial controller:
BMC unpacks the characters contained in the packages sent by the remote
workstation and forwards them to the serial controller as a character stream.