How do we verify that VTAM has successfully established a connection to the TCP/IP stack supporting Enterprise Extender?

z/OS Communications Server provides internal links between TCP/IP stacks that are running within the same MVS image. This support is referred to as a Same Host (IUTSAMEH) link. z/OS Communications Server uses the IUTSAMEH link for Enterprise Extender support.

Prior to establishment of a successful connection from VTAM to the TCP/IP stack supporting Enterprise Extender, a TSO NETSTAT DEVLINKS display will show a DevStatus of Sent SETUP for the IUTSAMEH link, as shown here:

 EZZ2760I DevName: IUTSAMEH          DevType: MPCPTP 
 EZZ2766I    DevStatus: Sent SETUP

 
 

To establish a connection from VTAM to the TCP/IP stack supporting Enterprise Extender, activate the EE XCA major node.

The first line activated in the EE XCA major node establishes a VTAM connection to the TCP/IP stack supporting Enterprise Extender. When this communication is established, the following messages appear on the console:

 EZZ4313I INITIALIZATION COMPLETE FOR DEVICE IUTSAMEH
 EZZ4324I CONNECTION TO ip_address ACTIVE FOR DEVICE IUTSAMEH 

In addition, when the EE XCA major node becomes active, the IUTSAMEH DevStatus changes to Ready, as shown below in this TSO NETSTAT DEVLINKS output:

 EZZ2760I DevName: IUTSAMEH          DevType: MPCPTP 
 EZZ2766I   DevStatus: Ready 

To be certain that there is an active VTAM-to-TCP/IP connection through the EE XCA and IUTSAMEH, use the Display EE command and look for messages IST1685I and IST2003I, as shown here:

 d net,ee 
 IST1685I TCP/IP JOB NAME = TCPIPA 
 IST2003I ENTERPRISE EXTENDER XCA MAJOR NODE NAME = EEXCA

For the first line activation associated with each unique static VIPA address (IPADDR or HOSTNAME), VTAM registers this VIPA address with the TCP/IP stack for EE communications. Any other line you activate from a group results in a new EZZ4324I message that indicates VIPA activation.

Each EZZ4324I message signifies that EE is registering the new static VIPA address with the TCP/IP stack and that the VIPA is ready to use.