You can use MVS™ system symbols in the names you specify for VTAM® definition statements and in the values you specify on the operands on those definition statements in all major nodes and in all definitions for routing and dynamic reconfiguration.
The substitution text for these system symbols is defined in MVS and is substituted by MVS in place of the symbols during VTAM startup, major node activation, resource activation, and table activation. See z/OS MVS Initialization and Tuning Guide and z/OS MVS Initialization and Tuning Reference for information about how to define the symbols in MVS.
MVS system symbols can be used to allow a single major node, routing or dynamic reconfiguration definition, or user-definable table to be used by multiple VTAMs in a multisystem environment. For information about how to use MVS system symbols in VTAMLST, see z/OS Communications Server: SNA Network Implementation Guide.