Chapter 4. Central processor complex I/O system structure 171
The OSA-Express4S 1000BASE-T Ethernet feature supports auto-negotiation when attached
to an Ethernet router or switch. If you allow the LAN speed and duplex mode to default to
auto-negotiation, the OSA-Express port and the attached router or switch auto-negotiate the
LAN speed and duplex mode settings between them. They connect at the highest common
performance speed and duplex mode of interoperation. If the attached Ethernet router or
switch does not support auto-negotiation, the OSA-Express port examines the signal that it is
receiving. It then connects at the speed and duplex mode of the device at the other end of the
cable.
The OSA-Express4S 1000BASE-T Ethernet feature can be configured as CHPID type OSC,
OSD, OSE, OSN, or OSM. Non-QDIO operation mode requires CHPID type OSE. When
defined as CHPID type OSM, the port provides connectivity to the INMN.
The following settings are supported on the OSA-Express4 1000BASE-T Ethernet feature
port:
Auto-negotiate
10 Mbps half-duplex or full-duplex
100 Mbps half-duplex or full-duplex
1000 Mbps full-duplex
If you are not using auto-negotiate, the OSA-Express port attempts to join the LAN at the
specified speed and duplex mode. If this does not match the speed and duplex mode of the
signal on the cable, the OSA-Express port does not connect.
4.8.5 OSA-Express for ensemble connectivity
The following OSA-Express features are used to connect z13s servers to IBM z BladeCenter
Extension (zBX) Model 004 and other ensemble nodes:
OSA-Express5S 10 Gigabit Ethernet (GbE) Long Reach (LR), FC 0415
OSA-Express5S 10 Gigabit Ethernet (GbE) Short Reach (SR), FC 0416
OSA-Express5S 1000BASE-T Ethernet, FC 0417
OSA-Express4S 10 Gigabit Ethernet (GbE) Long Reach (LR), FC 0406
OSA-Express4S 10 Gigabit Ethernet (GbE) Short Reach (SR), FC 0407
OSA-Express4S 1000BASE-T Ethernet, FC 0408
Intraensemble data network
The IEDN is a private and secure 10-Gbps Ethernet network. It connects all elements of an
ensemble, and is access-controlled by using integrated virtual LAN (VLAN) provisioning. No
client-managed switches or routers are required. The IEDN is managed by a primary
Hardware Management Console (HMC).
The IEDN connection requires two ports. The following features can be used, which are
configured as CHPID type OSX:
OSA-Express5S 10 GbE
OSA-Express4S 10 GbE
For redundancy, one port each from two OSA-Express 10 GbE features must be configured.
The connection is from the z13s server to the IEDN top-of-rack (ToR) switches on the zBX
Model 004. With a stand-alone z13s node (no-zBX), the connection is interconnect pairs of
OSX ports through LC Duplex directly connected cables, not wrap cables as was previously
recommended.
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