Fujitsu IRMC S2/S3 manual Serial Over LAN interface SOL, BMC and LAN controller

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.

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