Session initiation request

In Figure 1, assume that HOST11 and HOST21 are gateway VTAMs, and APPL1 wants to initiate a session with TERM1. The value of NQNMODE, either as a start option or defined on the CDRSC definition statement, affects the name by which the cross-network resource is known. If NQNMODE=NAME is specified as a start option or on the CDRSC definition statement for TERM1, because there is no TERM1 in NET1, TERM1 real name is TERM1 in NET3 and its alias name is TERM1 in NET1. (If a resource TERM1 actually existed in NET1, TERM1 in NET3 must be translated to a name that is not being used in NET1, such as TERM3 in NET1.)

If NQNMODE=NQNAME is specified as a start option or on the CDRSC definition statement for TERM1, TERM1 real name is NET3.TERM1. It is not known by the alias name NET1.TERM1. (If a resource TERM1 actually existed in NET1, and the session initiation request used a nonnetwork-qualified name, the session would be established with TERM1 in NET1. If the session initiation request used NET3.TERM1, the session would be established with TERM1 in NET3. Another option to using a network-qualified name in a session request would be to translate TERM1 to a name that is not being used in NET1, such as TERM3 in NET1.)

Note: A network-qualified session initiation request (for example, NET3.TERM1) cannot use the application ACBNAME unless it is the same as its APPL name.

Figure 1. Example of three interconnected networks

The session initiation request that is flowing from HOST11 to HOST21 contains the following information:

The alias name only (TERM1 in NET1), if APPL1 initiates a session for TERM1 with a nonnetwork-qualified name, and the CDRSC for TERM1 is dynamically defined or predefined using an alias name in HOST11.
Both the alias name (TERM1 in NET1) and the real name (TERM1 in NET3), if APPL1 initiates a session for TERM1 using a network-qualified name (NET3.TERM1), or if the session initiation request is network qualified.

The request flow described here assumes that GWCTL=SHR is in the host PCCU definition statement. If, according to the rules for gateway control, HOST11 is designated to request an alias address for GWN1, the real name for TERM1 must be properly determined in HOST11 by defining a CDRSC with NETWORK specified or by using the NetView® alias name translation facility.