3.2.1.6 VTAM Internal Trace
A VTAM internal trace (TYPE=VTAM) provides a record of events within
VTAM when VTAM is setting up a session. This trace can help determine the
flow of commands when you establish and terminate a session.
When you ask the system programmer for a VTAM internal trace, you have the
choice of three options:
•
OPTION=API traces the IBM application program interface calls.
•
OPTION=PIU traces all messages originating from VTAM or intended for
processing by VTAM. Like the buffer contents trace, it helps you isolate
problems with the hardware, NCP, or VTAM.
•
OPTION=SSCP traces session initiation and session termination. It helps
isolate VTAM problems to a specific VTAM module or component. For
example, you can use the SSCP option to trace the sequence of messages
(from the VTAM point of view) caused by entering the SET HOST/SNA
command.
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