Coding the GWNAU definition statement

For the native network, place a GWNAU definition statement after the SYSCNTRL definition statement:

BUILD NETID=neta
SYSCNTRL
GWNAU NAME=xname,NETID=yname,ELEMENT=nn

NAME: Identifies a CDRM for the connected network.
When you code the CDRM definition for this resource in your gateway VTAM®, this name must match the CDRM name.
NETID: Identifies the network in which this CDRM resides.
This value must match the value for the NETID operand of the BUILD definition statement found in the other network gateway NCP.
ELEMENT: Reserves an element address in the native network to represent the nonnative CDRM.
This value must match the ELEMENT value in the GWPATH statement for gateway VTAM.

GWNAU reserves one or more element addresses in the native network to represent other network resources. Some elements can be reserved in a dynamic pool while others can be predefined (that is, associated with a particular resource name).

Following are two circumstances when the GWNAU definition statement must be coded to predefine an element address in the gateway NCP:

If a nongateway SSCP in the network is to establish an SSCP-SSCP session with a gateway SSCP in another network, the GWNAU definition statement must be coded to predefine an element address for a gateway SSCP. This element address must also be specified on the ELEMENT operand of the CDRM definition statement that defines the gateway SSCP to the nongateway SSCP.
If you have cross-network sessions between CDRMs in nonadjacent networks, the GWNAU definition statement must be coded to reserve an element address in the gateway NCP subarea within the adjacent network. This element address must be specified on the ADJNETEL operand of the GWPATH definition statement that defines the nonadjacent CDRM.

Optionally, application programs that have multiple cross-network sessions can be predefined so that half-session control blocks (HSCBs) required to support the sessions with the application program are preassigned to the element used to represent the application program in the gateway NCP. This ensures that at least the preassigned number of control blocks are available to represent sessions with the application program. Statically allocated HSCBs and addresses cannot be used by any other resource.

Note: If you plan to have session monitors communicating from one network to another, it is strongly recommended that you code two GWNAU definition statements for each network management session (one for the primary-to-secondary session and one for the secondary-to-primary session) to reserve session control blocks in the NCP for the network management session.