Start the SMS trace with the MODIFY TRACE command, or use the TRACE start option with TYPE=SMS and ID=VTAMBUF specified. For more information about the MODIFY TRACE command, see z/OS Communications Server: SNA Operation. For more information about the TRACE start option, seez/OS Communications Server: SNA Resource Definition Reference.

Make sure that the GTF with the TRACE=USR option is active before starting this trace. See Starting the generalized trace facility (GTF). To format and print the data recorded by the GTF, use IPCS and set USR(FF0) or USR(CL02) on the GTFTRACE option.

For more information on printing trace output, see Formatting and printing trace records.