Type 2.1 channel connections between APPN nodes

Type 2.1 channel connections can be used to connect two network nodes or a network node and an end node. The following example shows how to connect an NCP in a composite network node to a network node, as depicted in Figure 1.

To define this type of connection, you must define the following:

Local SNA major node
NCP major node

The local SNA major node resides at the VTAM® network node, and the NCP major node resides at the VTAM host in the composite network node. Code PUTYPE=2 and XID=YES on the PU definition statement in the local SNA major node to define a peripheral type 2.1 node. Similarly, code PUTYPE=2 and XID=YES on the PU definition statement in the NCP major node to define a peripheral type 2.1 node.

To allow CP-CP sessions to be established between the two nodes, CONNTYPE=APPN and CPCP=YES must be specified on both of those PU definition statements unless CONNTYPE=APPN and CPCP=YES have been specified as start options.

The CP-CP sessions are established through the NCP by activating the local SNA major node from the network node and the line for the 2.1 channel from the VTAM composite node.

The following sample is from the NCP major node for this connection. The corresponding local SNA major node definition is found in Type 2.1 channel connections between APPN nodes.

*---------------------------------------------------------------------
*        L O C A L S N A   G R O U P S
*
*        DEFINITIONS FOR CHANNEL ATTACHED PU 2.1 (LOCAL SNA)
*---------------------------------------------------------------------
GRP3AAA1 GROUP LNCTL=CA,CA=TYPE5,NCPCA=ACTIVE
LN3AAA1  LINE  ADDRESS=04,TIMEOUT=840.0,CASDL=420.0,TRANSFR=255,       X
               INBFRS=128,ANS=CONT
P3A21AA1 PU    PUTYPE=2,OWNER=SSCP1A,XID=YES,                          X
               CONNTYPE=APPN,CPCP=YES,AUTHLEN=YES