z/OS Communications Server commands

In addition to the resource control facilities provided by FEPI, you can use specific z/OS® Communications Server commands to manage communication with target systems.

These commands are useful where there are problems in acquiring or releasing sessions. See ACQSTATUS.
Note: z/OS Communications Server was previously known as VTAM®.
The following list summarizes the z/OS Communications Server commands you can use. For a full description of each command, see z/OS Communications Server: SNA Operation.
    • Use the DISPLAY command to inquire about the status of the FEPI nodes (acting as SLUs) and the target systems. Normally, you need to use this command only when there are problems communicating with a particular target. To understand the displays, you require some knowledge of how the z/OS Communications Server operates. For explanations of messages, see z/OS Communications Server: SNA Messages .
    • Use the VARY command to control the availability of resources in the network. For FEPI, you can use this command to force the closure of a node regardless of whether it is in use in an active conversation. To do this, make the z/OS Communications Server node inactive. Any pending request to change to a state of RELEASED or OUTSERVICE can complete before the node becomes inactive. A subsequent VARY ACTIVE command makes the node available for use again (if its state is still INSERVICE).
    • Use the VARY TERM command to terminate individual connections; that is, to end the session between a particular PLU (target) and SLU (FEPI) pair.
    • Use the DISPLAY SESSIONS command to diagnose problems in establishing sessions. To use this command, you require an understanding of the z/OS Communications Server session processing.