Networking on z/OS
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VTAM subarea definitions

Networking on z/OS

VTAM definitions are located in two data sets referenced by two DDNAME statements in the VTAM started task stored in SYS1.PROCLIB.

  • One data set stores text definitions of the SNA network and is referenced by the VTAMLST DDNAME. The definitions include the various nodes in the network, routing, and hardware components such as channel-to-channel (CTC) connectors and OSA cards.
  • The second data set stores load modules (binary files) and is referenced by the VTAMLIB DDNAME. The files stored are initially coded using VTAM-supplied macros, than assembled and link-edited into the VTAMLIB data set. Examples of these binary definitions include LOGMODE tables and class of service (CoS) tables.
  • VTAM start options
    Start options provide information about the conditions under which VTAM runs.
  • VTAM configuration lists
    A configuration list specifies the resources that are to be activated when VTAM is started.
  • How VTAM resources are defined
    In addition to specifying start options and coding configuration lists, you'll need to identify resources in the network to VTAM.
  • Sift-down effect
    The sift-down effect enables you to code an operand on a higher-level node so that you do not need to recode it on each lower-level node for which you want the same value. As a result, the sift-down effect greatly simplifies the coding process.
  • Sample VTAM network
    The sample network demonstrates how to define this subarea network. The network consists of two mainframe hosts named HOSTA and HOSTB. The two mainframes are connected using Ethernet LAN implemented by an OSA in every host.
Parent topic: Systems Network Architecture - basics and implementation

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