Potential Conflicts With The Lan Over Usb Interface; Resolving Conflicts With The Imm2 Lan Over Usb Interface; Configuring The Lan Over Usb Interface - Lenovo Flex System x280 X6 Compute Node Installation And Service Manual

Potential conflicts with the LAN over USB interface

In some situations, the LAN over USB interface can conflict with certain network
configurations, applications, or both. For example, Open MPI attempts to use all
the available network interfaces on a server or compute node. Open MPI detects
the IMM2 LAN over USB interface and attempts to use it to communicate with
other systems in a clustered environment. The LAN over USB interface is an
internal interface, so this interface does not work for external communication with
other systems in the cluster.

Resolving conflicts with the IMM2 LAN over USB interface

Use any of the following actions to resolve LAN over USB conflicts with network
configurations and applications.
About this task
Use one of the following methods to resolve LAN over USB conflicts.
Note: For conflicts with Open MPI, configure the application so that it does not
attempt to use this interface.
v Take down the interface (run ifdown under Linux).
v Remove the device driver (run rmmod under Linux).
v Disable the LAN over USB interface from the CMM web interface.

Configuring the LAN over USB interface

An IMM2 must be configured to use the LAN over USB interface. The firmware
update package or Advanced Settings Utility attempts to perform the setup
automatically, if needed. If the automatic setup fails or if you prefer to set up the
LAN over USB manually, use one of the following processes.
For more information about LAN over USB configuration on different operating
systems, see http://www.ibm.com/support/entry/portal/
docdisplay?lndocid=MIGR-5083207.
Installing the LAN over USB Windows device driver
When you install a Windows operating system, there will be an unknown RNDIS
device in the Device Manager. IBM provides a Windows INF file that identifies this
device. The signed version of the INF file is included in all of the Windows
versions of the IMM2, UEFI, and DSA update packages. Complete the following
steps to install ibm_rndis_server_os.inf.
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Flex System x280 X6, x480 X6, and x880 X6 Compute Node Types 7903 and 4259: Installation and Service Guide
Note: You cannot update the firmware for a compute node while the LAN over
USB interface is disabled. Before updating the firmware, you must re-enable the
interface. After updating the firmware, you can disable the interface again.
To disable the LAN over USB interface from the CMM web interface, complete
the following steps.
1. Log in to the CMM web interface.
2. From the CMM web interface homepage click Chassis Management >
Compute Nodes.
3. Click the compute node ID.
4. Click the General tab.
5. Uncheck Enable Ethernet Over USB to disable the LAN over USB interface.