Coding the BUILD definition statement

Identify the NCP native network with the NETID operand on the BUILD definition statement.

On the BUILD definition statement, add the following operands:

NETID (required): The NETID operand specifies the name of the native network. VTAM® compares the NETID coded on the BUILD definition statement to the NETID start option coded for VTAM. If these values match, VTAM is in the NCP native network. Resources attached to an NCP are controlled only by SSCPs in the native network of the NCP.
If the NETID specifications do not match, VTAM searches for a NETWORK definition statement with a matching NETID.
HSBPOOL (required): Two half-session control blocks (HSCBs) are required to represent each cross-network session, one for each session partner. HSCBs can be statically allocated with the GWNAU definition statement.
The value specified for the HSBPOOL operand is the total number of HSCBs in the gateway NCP to represent cross-network sessions that require dynamic assignment of an HSCB. HSCBs for each network attached to the gateway NCP are dynamically allocated from this pool. You can limit the number of HSCBs that can be allocated from the pool for a given network by specifying a NETLIM value on the BUILD or NETWORK definition statement. You can also limit the HSCBs for a given address by specifying SESSLIM on the BUILD or NETWORK definition statement.
CANETID: The CANETID operand applies only to a channel-attached gateway NCP and the 3720 communication controller. CANETID specifies the network ID of the network containing the host attached through each channel adapter. The gateway NCP uses the CANETID specification to determine the network affinity for each specified channel adapter. CANETID thus specifies in which network each channel-attached host is located.
The gateway NCP uses CANETID to determine which channel-attached hosts can activate resources attached to the gateway NCP. It also determines whether a particular channel-attached host is in the native network.

Also do the following steps:

Add one ERLIMIT operand (optional).
Add one SALIMIT operand (optional).
Add one GWSESSAC operand.
Add one GWAEXIT operand (optional).
Add one COSTAB operand (optional VTAM-only operand).
Update the VRPOOL to include the additional virtual routes from other networks that end in the gateway NCP.