Intel Server Board S2400BB

Intel® Server Board S2400BB TPS
Revision 2.0
56
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 100 ms.
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.
6.10.3.5.4 DHCP-related LAN Configuration Parameters
Users may not change the following LAN parameters while the DHCP is enabled:
 LAN configuration parameter 3 (IP Address)
 LAN configuration parameter 6 (Subnet Mask)
 LAN configuration parameter 12 (Default Gateway Address)
To prevent users from disrupting the BMC’s LAN configuration, the BMC treats these parameters as read-only
while DHCP is enabled for the associated LAN channel. Using the Set LAN Configuration Parameter command
to attempt to change one of these parameters under such circumstances has no effect, and the BMC returns
error code 0xD5, “Cannot Execute Command. Command, or request parameter(s) are not supported in present
state.”