72 Communications Server for z/OS V1R7 TCP/IP Implementation, Volume 1 - Base Functions, Connectivity, and Routing
PROFILE.TCPIP
Before you start your TCP/IP stack, you must configure the operational and address space
characteristics.
These definitions are entered into a PROFILE configuration data set that is read by the
TCP/IP address space during initialization.
A sample PROFILE.TCPIP configuration file is provided in hlq.SEZAINST(SAMPPROF).
The PROFILE data set contains the following major groups of TCP/IP configuration
parameters:
Operating characteristics
Reserved port number definitions
Network connectivity definitions
Telnet definitions
Network routing definitions
For more information about TCP/IP Telnet definitions, see Communications Server for z/OS
V1R7 TCP/IP Implementation, Volume 2 - Standard Applications, SG24-7170.
Detailed information about TCP/IP connectivity and routing definitions can be found in
Chapter 4, “Connectivity” on page 101, and Chapter 5, “Routing” on page 139, respectively.
3.6.2 VTAM Resource
As mentioned in the introduction, VTAM provides the Data Link Control layer (Layer 2 of the
OSI model) for TCP/IP, including support of the Multi-Path Channel (MPC) interfaces. MPC
protocols are used to define the DLC layer for OSA-Express devices in QDIO. OSA-Express
QDIO connections are configured via a TRLE definition. All TRLEs are defined as VTAM
major nodes. For further information about MPC-related devices/interfaces refer to Chapter 4,
“Connectivity” on page 101.
A TRLE definition we used for our OSA-Express in QDIO mode is shown in Example 3-3.
Example 3-3 TRLE VTAM major node definition for device OSA2080
OSA2080 VBUILD TYPE=TRL
OSA2080P TRLE LNCTL=MPC,
READ=2080,
WRITE=2081,
DATAPATH=(2082-2087),
PORTNAME=OSA2080, 1
MPCLEVEL=QDIO
SInce VTAM provides the DLC layer for TCP/IP, then VTAM must be started before TCP/IP.
The major node (in our case, OSA2080) should be activated when VTAM is initializing. This
will ensure the TRLE is active when the TCP/IP stack is started. This is accomplished by
placing an entry for OSA2080 in the VTAM startup list ATCCONxx. The portname 1
(Example 3-3) must also be the same name as the device name defined in TCP/IP PROFILE
data set on the DEVICE and LINK statements.
3.6.3 PROFILE.TCPIP parameters
The syntax for the parameters in the PROFILE can be found in z/OS V1R7.0 CS: IP
Configuration Reference, SC31-8776.