gtpm1m2lTPF V4R1 Migration Guide: 3.1 to 4.1

Generating the Systems Network Architecture (SNA) Table

To use generic names in session requests from cross-domain LUs you must define a control point LU (CLU) for each CTC connection to VTAM. Code your OSTG CTC statement with the following new parameters.

Parameter
Description

 CLU 
Specifies the name of the CLU for this CTC. This parameter is only required for CTC connections to VTAM when you are bringing up TPF/APPC sessions. If you are running loosely coupled, then you must specify multiple CLU names, one for each TPF processor in the complex (so that each TPF processor has its own CLU-Logon Manager session). You must define the CLU names to VTAM as a CDRSC.

If you specify the CLU parameter, you must also specify the new QN parameter.

If two CTC connections are defined between a TPF host and VTAM, you must have defined a CLU for at least one of them. IBM recommends that both connections have a CLU for load balancing across the two connections and to provide backup for each other in case one connection becomes unavailable.

 QN 
Specifies a qualifier number of two hexadecimal digits to uniquely represent to VTAM each CTC link as a path to a TPF application program. The QN parameter is required for CTC connections to VTAM if you want to bring up TPF/APPC sessions across them. The qualifier is appended to the TPF/APPC LU name and CPU ID when defining the alias name for the TPF/APPC LUs associated with this CTC connection. The alias names must be defined as a CDRSC to VTAM.
Note:
When one TPF 4.1 image communicates through a channel-to-channel connection with another TPF image at a lower level, there may be an incompatibility when using a CPU ID greater than P. The existing TPF image can connect to the new TPF 4.1 image if the CPU ID of the new image is less than P. If the CPU ID of the new image is greater than P (that is, Q through Z or 0 through 9), it cannot be connected to the existing image.

On the ALS statement, the ALSQN parameter can also be coded with QN. The TPF 4.1 system still supports ALSQN.