Intel S1200BT Technical Product Specification - Page 42

Integrated BMC LAN Channels - mb s1200bts

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Functional Architecture Intel® Server Board S1200BT TPS 3.6.1 Integrated BMC LAN Channels The Integrated BMC supports two RMII/RGMII ports that can be used for communicating with Ethernet devices. One port is used for communication with the on-board NICs and the other one is used for communication with an Ethernet PHY located on an optional add-in card (or equivalent on-board circuitry). 3.6.1.1 Baseboard NICs The baseboard NIC is connected to a single Integrated 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 fullduplex multi-drop interface which allows multiple NICs to be connected to the Integrated 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. 3.6.1.2 Dedicated Management Channel An additional LAN channel dedicated to Integrated BMC usage and not available to host SW is supported through an optional add-in card. There is only a PHY device present on the add-in card. The Integrated 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 card connects to the Integrated BMC's other RMII/RGMII interface (that is the one that is not connected to the baseboard NICs). This Integrated BMC port is configured for RGMII usage. In addition to the use of an 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 Integrated BMC for manageability purposes. When this is enabled, that port is hidden from the OS. 3.6.1.3 Concurrent Server Management Use of Multiple Ethernet Controllers Provided the HW supports a management link between the Integrated BMC and a NIC port, the Integrated BMC FW supports concurrent OOB LAN management sessions for one on-board NIC and the optional dedicated add-in management NIC combinations. 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 two 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: 30 Revision 2.0 Intel order number G13326-004

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Functional Architecture
Intel®
Server Board S1200BT TPS
Revision 2.0
Intel order number G13326-004
30
3.6.1
Integrated BMC LAN Channels
The Integrated BMC supports two RMII/RGMII ports that can be used for communicating with
Ethernet devices. One port is used for communication with the on-board NICs and the other
one is used for communication with an Ethernet PHY located on an optional add-in card (or
equivalent on-board circuitry).
3.6.1.1
Baseboard NICs
The baseboard NIC is connected to a single Integrated 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 Integrated 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.
3.6.1.2
Dedicated Management Channel
An additional LAN channel dedicated to Integrated BMC usage and not available to host SW is
supported through an optional add-in card. There is only a PHY device present on the add-in
card. The Integrated 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 card connects to the Integrated BMC’s other RMII/RGMII interface (
that is the
one that is not connected to the baseboard NICs). This Integrated BMC port is configured for
RGMII usage.
In addition to the use of an 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 Integrated BMC for manageability
purposes. When this is enabled, that port is hidden from the OS.
3.6.1.3
Concurrent Server Management Use of Multiple Ethernet Controllers
Provided the HW supports a management link between the Integrated BMC and a NIC port, the
Integrated BMC FW supports concurrent OOB LAN management sessions for one on-board
NIC and the optional dedicated add-in management NIC combinations.
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 two 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: