Technical Product Specification

Intel® Server Boards S4600LH2/T2 TPS
Revision 2.0
73
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 the management NICs from a pool of 2 MAC addresses specifically for manageability. For these
channels, support can be enabled for IPMI-over-LAN and DHCP.
The server board has five 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)
 BMC LAN channel 1 MAC address = NIC1 MAC address + 2
 BMC LAN channel 2 MAC address = NIC1 MAC address + 3
 BMC LAN channel 3 (RMM) MAC address = NIC1 MAC address + 4
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) ----- 100Mbps (10Mbps in DC off state)
BMC LAN 2 (Baseboard NIC port) ----- 100Mbps (10Mbps in DC off state)
BMC LAN 3 (Dedicated NIC) ----- 1000Mbps