Intel Server Board S2400BB

Intel® Server Board S2400BB TPS
Revision 2.0
53
6.10.3.1 RMCP/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.
6.10.3.2 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 an optional RMM4 add-in module.
6.10.3.2.1 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 NIC(s) 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 will provide 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 via a BIOS setup option.
6.10.3.2.2 Dedicated Management Channel
An additional LAN channel dedicated to BMC usage and not available to host SW is supported via an optional
RMM4 add-in card. There is only a PHY device present on the RMM4 add-in card. The BMC has a built-in
MAC module that uses the RGMII interface to link with the card’s PHY. Therefore, for this dedicated
management interface, the PHY and MAC are located in different devices.
The PHY on the RMM4 connects to the BMC’s other RMII/RGMII interface (i.e. the one that is not connected to
the baseboard NICs). This BMC port is configured for RGMII usage.
In addition to the use of an RMM4 add-in card for a dedicated management channel, on systems that support
multiple Ethernet ports on the baseboard, the system BIOS provides a setup option to allow one of these
baseboard ports to be dedicated to the BMC for manageability purposes. When this is enabled, that port is
hidden from the OS.
6.10.3.2.3 Concurrent Server Management Use of Multiple Ethernet Controllers
The BMC FW supports concurrent OOB LAN management sessions for the following combination:
 2 on-board NIC ports
 1 on-board NIC and the optional dedicated RMM4 add-in management NIC.
 2 on-board NICs and optional dedicated RMM4 add-in management NIC.
All NIC ports must be on different subnets for the above concurrent usage models.
MAC addresses are assigned for management NICs from a pool of up to 3 MAC addresses allocated
specifically for manageability.
The server board has seven MAC addresses programmed at the factory. MAC addresses are assigned as
follows:
• NIC 1 MAC address (for OS usage)
• NIC 2 MAC address = NIC 1 MAC address + 1 (for OS usage)