gtpi1m4jSystem Installation Support Reference

Select ALS to Adjacent APPN Node

The select adjacent link station (ALS) to adjacent Advanced Peer-to-Peer Networking (APPN) node user exit, UALS, allows you to select which ALS the TPF system will use to start a session with an LU 6.2 resource that resides in an adjacent APPN node.

UALS is called when the TPF system starts an LU 6.2 session and the local LU is the primary LU (PLU) and the remote LU is known to reside in an APPN node adjacent to the TPF system. Because the remote LU resides in an adjacent node, there is no need to send a LOCATE search on the CP-CP sessions. Instead, a BIND request can be sent directly to the adjacent APPN node. UALS selects the ALS over which to send the BIND request.

Input

R3
SCB1 address of the LU 6.2 session being started.

R4
RVT1 address of the adjacent APPN control point (CP).

Programming Considerations

Return Values

R1 contains the return code:

 0 
No active ALS exists between the TPF system and the specified adjacent CP.

x
The CCW index of the ALS over which to send the BIND request to start the LU 6.2 session, where x is the CCW index.