In this example, the PROFILE DD cards are specified as follows:
//TCPIP PROC PARMS='CTRACE(CTIEZB00)'
//*
//* z/OS Communications Server
//* SMP/E Distribution Name: EZAEB01G
//*
//* 5694-A01 (C) Copr. IBM Corp. 1991,2001.
//* US Government Users Restricted Rights -
//* Use, duplication or disclosure restricted
//* by GSA ADP Schedule Contract with IBM Corp.
//* See IBM Copyright Instructions
//*
//TCPIP EXEC PGM=EZBTCPIP,
// PARM='&PARMS',
// REGION=0K,TIME=1440
//*
⋮
//PROFILE DD DISP=SHR,DSN=MVSA.PROD.PARMS(PROFILE)
⋮
Because the PROFILE DD is the first step in the search order, TCP/IP uses the data set MVSA.PROD.PARMS(PROFILE) as the PROFILE.TCPIP configuration file.