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Blade server Ethernet controller enumeration
The enumeration of the Ethernet controllers in a blade server is operating-system
dependent. You can verify the Ethernet controller designations that a blade server
uses through the operating-system settings.
The routing of an Ethernet controller to a particular I/O-module bay depends on
the type of blade server. You can verify which Ethernet controller is routed to
which I/O-module bay by using the following test:
1. Install only one Ethernet switch module or pass-thru module in I/O-module
2. Make sure that the ports on the switch module or pass-thru module are
3. Enable only one of the Ethernet controllers on the blade server. Note the
4. Ping an external computer on the network that is connected to the switch
If you have installed an I/O expansion card in the blade server, communication
from the expansion card should be routed to I/O-module bays 3 and 4, if these
bays are supported by your BladeCenter unit. You can verify which controller on
the card is routed to which I/O-module bay by performing the same test and
using a controller on the expansion card and a compatible switch module or
pass-thru module in I/O-module bay 3 or 4.
MAC addresses for host Ethernet adapters
Two integrated Ethernet controllers in the JS12 blade server each provide a Host
Ethernet Adapter (HEA) that, in turn, provides virtual logical host Ethernet adapters
(LHEAs) to client logical partitions (LPARs). The Virtual I/O Server software uses
LHEAs as if they were real physical adapters.
The logical HEAs in the JS12 blade server bypass the need for further bridging
from Virtual I/O Server, because the LHEAs connect directly to the integrated
Ethernet controllers in the blade server, and from there to the I/O modules in the
BladeCenter unit.
The JS12 blade server uses two physical HEA ports and 14 logical HEA ports to
share the two integrated physical Ethernet adapters on the blade server. The 14
logical HEA medium access control (MAC) addresses are in the same range as the
two integrated Ethernet controllers (eth0 and eth1) and the two associated physical
HEA ports on the blade server.
The MAC addresses of the two physical HEAs are displayed in the advanced
management module. The MAC address of the first integrated Ethernet controller
(eth0) is listed on a label on the blade server. The label also lists the last MAC
address. Table 35 on page 283 shows the relative addressing scheme.
282
JS12 Type 7998: Problem Determination and Service Guide
bay 1.
enabled. Click I/O Module Tasks → Admin/Power/Restart in the
management-module Web interface.
designation that the blade server operating system has for the controller.
module or pass-thru module. If you can ping the external computer, the
Ethernet controller that you enabled is associated with the switch module or
pass-thru module in I/O-module bay 1. The other Ethernet controller in the
blade server is associated with the switch module or pass-thru module in
I/O-module bay 2.
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