Intel® Server Board S1200SP Family Technical Product Specification
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6.11.3 LAN Interface
The BMC implements both the IPMI 1.5 and IPMI 2.0 messaging models. These provide out-of-band local area
network (LAN) communication between the BMC and the network.
See the Intelligent Platform Management Interface Specification Second Generation v2.0 for details about the
IPMI-over-LAN protocol.
Run-time determination of LAN channel capabilities can be determined by both standard IPMI defined
mechanisms.
6.11.3.1 RMCP/ Alert Standards Forum (ASF Messaging)
The BMC supports RMCP ping discovery in which the BMC responds with a pong message to an RMCP/ASF
ping request. This is implemented per the Intelligent Platform Management Interface Specification Second
Generation v2.0.
6.11.3.2 BMC LAN Channels
The BMC supports three RMII/RGMII ports that can be used for communicating with Ethernet devices. Two
ports are used for communication with the on-board NICs and one is used for communication with an Ethernet
PHY located on the onboard dedicated RMM4 NIC.
6.11.3.2.1 Baseboard NICs
The on-board Ethernet controller provides support for a Network Controller Sideband Interface (NC-SI)
manageability interface. This provides a sideband high-speed connection for manageability traffic to the BMC
while still allowing for a simultaneous host access to the OS if desired.
The NC-SI is a DMTF industry standard protocol for the side band management LAN interface. This protocol
provides a fast multi-drop interface for management traffic.
The baseboard NICs are connected to a single BMC RMII/RGMII port that is configured for RMII operation. The
NC-SI protocol is used for this connection and provides a 100 Mb/s full-duplex multi-drop interface which
allows multiple NICs to be connected to the BMC. The physical layer is based upon RMII, however RMII is a
point-to-point bus whereas NC-SI allows 1 master and up to 4 slaves. The logical layer (configuration
commands) is incompatible with RMII.
The server board provides support for a dedicated management channel that can be configured to be hidden
from the host and only used by the BMC. This mode of operation is configured using a BIOS setup option.
6.11.3.2.2 Dedicated Management Channel
An additional LAN channel dedicated to BMC usage is supported using the on-board RMM4 NIC. The BMC has
a built-in MAC module that uses the RGMII interface to link with the RMM4 NIC’s PHY. Therefore, for this
dedicated management interface, the PHY and MAC are located in different devices.
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