Intel S2400SC Technical Product Specification page 82

Platform Management Functional Overview
6.12.3.2.2 Dedicated Management Channel
An additional LAN channel dedicated to BMC usage and not available to host SW is supported
by 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 (that is, 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.
6.12.3.2.3 Concurrent Server Management Use of Multiple Ethernet Controllers
The BMC FW supports concurrent OOB LAN management sessions for the following
combination:

Two on-board NIC ports

One on-board NIC and the optional dedicated RMM4 add-in management NIC.

Two 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 three MAC addresses
allocated specifically for manageability. The total number of MAC addresses in the pool is
dependent on the product HW constraints (for example, a board with two NIC ports available for
manageability would have a MAC allocation pool of 2 addresses). For these channels, support
can be enabled for IPMI-over-LAN and DHCP.
For security reasons, embedded LAN channels have the following default settings:

IP Address: Static

All users disabled
IPMI-enabled network interfaces may not be placed on the same subnet. This includes the
®
Intel Dedicated Server Management NIC and either of the BMC's embedded network
interfaces.
Host-BMC communication over the same physical LAN connection – also known as "loopback"
– is not supported. This includes "ping" operations.
On server boards with more than two onboard NIC ports, only the first two ports can be used as
BMC LAN channels. The remaining ports have no BMC connectivity.
Maximum bandwidth supported by BMC LAN channels are as follows:

BMC LAN1 (Baseboard NIC port) ----- 100Mb (10Mb in DC off state)

BMC LAN 2 (Baseboard NIC port) ----- 100Mb (10Mb in DC off state)

BMC LAN 3 (Dedicated NIC) ----- 100Mb
70 Intel order number G36516-002
Intel® Server Board S2400SC TPS
Revision 2.0