Server Management Guide
Baseboard Management Controller
24 Intel
®
Server Boards and Server Platforms Server Management Guide
Interface 3: This interface is available from an optional Intel
®
RMM4, which is a dedicated
management NIC and not shared with the host.
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
®
RMM4’s on-board network interface, and 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.
2.5.3 Dedicated MAC Address
Each of the BMC’s two NIC channels has a unicast MAC filter reserved for BMC use. These filters
enable the BMC to receive network data streams that are logically separate from, and invisible to,
operating systems and software running on the server, despite sharing the same physical LAN
connections. This allows the BMC to support features beyond standard IPMI-over-LAN, such as
DHCP, full ARP request/response, and ICMP, without requiring a separate Ethernet cable.
For Intel
®
S1200BT series server boards, each server board has four MAC addresses assigned to it at
the Intel
®
factory. The printed MAC address is assigned to NIC1 on the server board.
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 3 MAC address = NIC2 MAC address + 2
2.5.4 IPMI 2.0 Channel Management
Every messaging interface is assigned an IPMI channel ID by IPMI 2.0. Commands are provided to
configure each channel for privilege levels and access modes. The following table shows the standard
channel assignments.
Table 12. IPMI Channel ID Assignments
Channel
ID
Interface
Supports
Sessions
0
Primary IPMB
No
1
LAN 1
(only accessible by means of 82574L LAN port, NIC_2)
Yes
2
Reserved
(To be used on future products to support 2 LAN channels on the baseboard)
–
3
LAN2
1
(Provided by the Intel
®
Dedicated Management NIC)
Yes