| dependencies: | z/OS®; applies only to VTAMs defined in a sysplex environment |
Specifies the subplex group ID suffix that is to be used for this VTAM®. The group_id value is a 1-digit or 2-digit numeric value. The value specified must be in the range 2 - 31. This value is used to modify the sysplex group names that VTAM joins in the sysplex.
If XCFGRPID=vv is specified, VTAM will join the sysplex groups ISTXCFvv and ISTCFSvv. In addition, the structure names for generic resources and MNPS (which can be specified in the STRGR and STRMNPS start options) will be suffixed with the XCFGRPID value. This value is also used in combination with the TCP XCFGRPID value (specified on the GLOBALCONFIG statement in the TCP/IP profile) to modify the name of the sysplex group that TCP/IP joins. If GLOBALCONFIG XCFGRPID tt is specified in the TCP/IP profile, then the TCP/IP stack joins sysplex group EZBTvvtt. In addition, if SWSA or Sysplexports Coupling Facility structures are used, the structure names are EZBDVIPAvvtt and EZBEPORTvvtt, respectively.
If no VTAM XCFGRPID option is specified, VTAM joins groups ISTXCF and ISTCFS01, and the generic resource and MNPS structures are not suffixed. If a TCP/IP XCF group ID is specified, then the TCP/IP stack joins groups EXBTCPtt, and the structure names for SWSA and sysplexports are EZBDVIPA01tt and EZBEPORT01tt.
Guideline: For MNPS structures, ensure that the suffixed structure name in one node cannot be mistaken as an alternate MNPS structure of an MNPS base structure in another node. For example, if one VTAM node in the sysplex is started with start options specifying XCFGRPID=11 and STRMNPS=ISTMYMNPS and another VTAM node is started with STRMNPS=ISTMYMNPS and no XCFGRPID start option is specified, then the structure name generated for the MNPS structure in the first VTAM node (ISTMYMNPS11) will appear to be an alternate structure for the MNPS base structure (ISTMYMNPS) in the second VTAM node.