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What address spaces must be active before starting z/OS Communications Server's TCP/IP stack?

Question & Answer


Question

We need to know what, if any, address spaces must be active before we can start the TCP/IP stack.

Answer

The IP Configuration Guide addresses this issue in the section Required steps before starting TCP/IP:

"TCP/IP uses services from other address spaces in its processing. While TCP/IP waits for availability of those services, it is recommended that you verify that the OMVS, resolver, and VTAM address spaces have completed initialization before starting TCP/IP. If using automation to start TCP/IP, have it look for the BPXI004I, EZZ9291I, and IST020I messages, respectively, before issuing the START command."

The complete texts of these messages are shown below:

BPXI004I OMVS INITIALIZATION COMPLETE

EZZ9291I RESOLVER INITIALIZATION COMPLETE

IST020I VTAM INITIALIZATION COMPLETE FOR level

In addition, the IP Configuration Guide states the following: "If you configure VMCF and TNF as restartable subsystems and you want the VMCF node name to be used as a default host name during TCP/IP initialization (when no other host name can be located), VMCF must be started before TCP/IP."

Finally, "The following TCP/IP applications and commands will abend if VMCF is not active:

  • LPD servers

  • TSO HOMETEST, LPQ, LPR, LPRM, LPRSET, TELNET, and TESTSITE commands"

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Product Synonym

ZOSCS COMMSERVER

Document Information

Modified date:
12 October 2018

UID

dwa1209936