CICS Transaction Gateway V5 The WebSphere ... - IBM Redbooks

26 CICS Transaction Gateway V5
If you are using an LU 6.2 over an IP connection (as provided by the TCP62
protocol), you do not require a switched major node but instead will require a
TCP major node, and possibly CDRSC definitions. For further details, refer to
3.3, “VTAM definitions” on page 44.
► Network name: The first parameter you should ascertain before you
define any VTAM resource is the name of your VTAM network, which will
most likely have already been defined by your VTAM systems programmer.
This is defined in the NETID parameter in the VTAM start procedure; in our
configuration, it was (1) USIBMSC.
In the following sections, we detail how to configure each of these resources.
2.3.1 VTAM application major node
For a CICS system to be able to communicate with other SNA logical units using
VTAM services, you must define CICS to ACF/VTAM. This is achieved by
defining a VTAM application program (APPL) major node for each CICS region.
These are defined as APPL definition statements in a member of the
SYS1.VTAMLST library. Example 2-1 shows the VTAM APPL definition for our
CICS region (6)SCSCPJA1.
Example 2-1 VTAM APPL definition
VBUILD TYPE=APPL
SCSCPJA1 APPL AUTH=(ACQ,VPACE,PASS),VPACING=0,EAS=5000,PARSESS=YES, X
SONSCIP=YES,APPC=NO,MODETAB=MTAPPC
AUTH Must be specified as ACQ to allow CICS to acquire sessions.
VPACE is required to allow pacing of the LU 6.2 flows. PASS will
allow existing terminal sessions to be passed to other CICS
region using the CICS command EXEC CICS ISSUE PASS.
EAS Is the number of network addressable units (NAU) that this LU
can establish sessions with, and can have a maximum value of
5000. An NAU is either a logical unit, a physical unit, or a control
point. This parameter therefore limits the maximum number of
LU-LU sessions any one CICS region can have.
PARSESS Must be specified as YES, since the CICS TG requires LU 6.2
parallel sessions to be used.
SONSCIP Specifies session outage notification support, which enables
CICS, in some cases, to recover a failed system without requiring
operator intervention.
APPC Must be specified as NO.