Connecting to a connection network using NTRI

VTAM® can connect to a connection network on a token ring LAN through the NCP Token Ring interconnection (NTRI). An NCP can define multiple token ring connections for connection network in a single major node. These multiple connections can be to the same token ring or different token rings.

Guideline: NCP V7R1 is required for NCP/Token-Ring interconnection support of connection network.

To define a connection to a connection network, include the following in the NCP major node:

The GROUP statement for the NTRI physical lines must specify ECLTYPE=PHYSICAL. VTAM uses the ECLTYPE operand to detect lines used for peripheral devices connected through NTRI.
The VNNAME operand must be coded on either the LINE or GROUP definition statements. VNNAME specifies a 1-17 character network-qualified CPNAME for the connection network. If VNNAME is coded on the GROUP definition statement, it sifts down to all the subordinate LINE statements.
The VNGROUP operand must be coded on either the LINE or GROUP definition statements. VNGROUP specifies the name of the logical GROUP containing dial-out links through the connection network named on the VNNAME operand. If VNGROUP is coded on the GROUP definition statement, it sifts down to all the subordinate LINE statements.

The example code that follows, from an NCP major node definition, illustrates NCP connection network support through NTRI.

*---------------------------------------------------------------------
*
*        T O K E N  R I N G  P E R I P H E R A L  P U S
*        (PHYSICAL GROUP/LINES/PUS)
*
*---------------------------------------------------------------------
*
GP4ATRP1 GROUP ECLTYPE=PHYSICAL,LNCTL=SDLC,DIAL=NO,                    X
               PUTYPE=1,XID=NO,ANS=CONTINUE,PUDR=NO
*
LN4ATR10 LINE  ADDRESS=010,PORTADD=01,LOCADD=40004A000010,CAPACITY=4M, X
               LANNAME=TOKBUS01,VNNAME=NETB.VN1,VNGROUP=GP4ATR10
*
P4ATR10  PU    ADDR=01,PUTYPE=1,ANS=CONTINUE
*

If CP-CP sessions are desired between two nodes on the connection network, you must define a switched major node at the calling node. This switched major node should define a PU for any node on the connection network that the calling-out node is to call. Because DYNPU=YES is enforced automatically when a session is established through the connection network, it is not necessary for DYNPU=YES to be coded by the called nodes.