Defining the Local LU to VTAMLST

When VTAM® is initialized on an z/OS® system, local LUs are activated based on information in the system VTAMLST library. To define the local APPC/MVS LU to VTAM, use a VTAM application (APPL) definition in the VTAMLST library that is defined in the VTAM start procedure. The VTAM APPL definition:

Names the local APPC/MVS LU
Sets up defaults for the LU
Specifies the name of the logon mode table that contains the logon mode used by the LU
Defines security for the LU

Figure 1 is an example of a VTAM APPL definition. This example can be found in system SAMPLIB member GDEAPDEF, for example, SYS1.SAMPLIB(GDEAPDEF), or see GDEAPDEF.

Figure 1. VTAM APPL Definition

   MVSLU01 APPL   ACBNAME=MVSLU01,  ◄─── ACBNAME (also 
APPC/MVS LUADD)
                  APPC=YES,
                  AUTOSES=0,
                  DDRAINL=NALLOW,
                  DMINWNL=5,
                  DMINWNR=5,
                  DRESPL=NALLOW,
                  DSESLIM=10,
                  LMDENT=19,
                  MODETAB=LOGMODES, ◄─── VTAM Logon Mode Table name
                  PARSESS=YES,
                  SECACPT=CONV,
                  SRBEXIT=YES,
                  VPACING=1

The ACBNAME and MODETAB parameters in this example do the following:

ACBNAME=MVSLU01: Defines the local APPC/MVS LU name as MVSLU01. The LU name specified must match the local LU name defined in PARMLIB member APPCPMxx.
MODETAB=LOGMODES: Defines the name of the logon mode table as LOGMODES. This parameter is optional. Including it, however, allows you to make additional logon mode definitions known to VTAM. This is required if the logon mode name specified by the partner system is not supplied in the VTAM default logon mode table ISTINCLM.
The name for the logon mode table name must match the name of a defined in VTAMLIB.

For more information about VTAM APPL definitions, see z/OS MVS Planning: APPC/MVS Management.