Intel S2600CO series User Manual page 79

Intel® Server Board S2600CO Family TPS
6.10.3.5.2 Static LAN Configuration Parameters
When the IP Address Configuration parameter is set to 01h (static), the following parameters
may be changed by the user:
LAN configuration parameter 3 (IP Address)

LAN configuration parameter 6 (Subnet Mask)

LAN configuration parameter 12 (Default Gateway Address)

When changing from DHCP to Static configuration, the initial values of these three parameters
will be equivalent to the existing DHCP –set parameters. Additionally, the BMC observes the
following network safety precautions:
1. The user may only set a subnet mask that is valid, per IPv4 and RFC 950 (Internet Standard
Subnetting Procedure). Invalid subnet values return a 0Xcc (Invalid Data Field in Request)
completion code, and the subnet mask is not set. If no valid mask has been previously set,
default subnet mask is 0.0.0.0.
2. The user may only set a default gateway address that can potentially exist within the subnet
specified above. Default gateway addresses outside the BMC's subnet are technically
unreachable and the BMC will not set the default gateway address to an unreachable value.
The BMC returns a 0Xcc (Invalid Data Field in Request) completion code for default
gateway addresses outside its subnet.
3. If a command is issued to set the default gateway IP address before the BMC's IP address
and subnet mask are set, the default gateway IP address is not updated and the BMC
returns 0Xcc.
If the BMC's IP address on a LAN channel changes while a LAN session is in progress over that
channel, the BMC does not take action to close the session except through a normal session
timeout. The remote client must re-sync with the new IP address. The BMC's new IP address is
only available in-band through the Get LAN Configuration Parameters command.
6.10.3.5.3 Enabling/Disabling Dynamic Host Configuration (DHCP) Protocol
The BMC DHCP feature is activated by using the Set LAN Configuration Parameter command
to set LAN configuration parameter 4, IP Address Source, to 2h:"address obtained by BMC
running DHCP". Once this parameter is set, the BMC initiates the DHCP process within
approximately 100ms.
If the BMC has previously been assigned an IP address through DHCP or the Set LAN
Configuration Parameter command, it requests that same IP address to be reassigned. If the
BMC does not receive the same IP address, system management software must be
reconfigured to use the new IP address. The new address is only available in-band, through the
IPMI Get LAN Configuration Parameters command.
Changing the IP Address Source parameter from 2h to any other supported value will cause the
BMC to stop the DHCP process. The BMC uses the most recently obtained IP address until it is
reconfigured.
If the physical LAN connection is lost (that is, the cable is unplugged), the BMC will not re-
initiate the DHCP process when the connection is re-established.
Revision 1.4
Intel order number G42278-004
Platform Management Functional Overview
67