RTP connection for LU-LU session does not include entire session path

Problem statement

The LU-LU session activates and an RTP connection is established but includes only part of the session path.

Common symptoms

Message IST1487I contains a destination CPNAME that is not the name of the session partner node.

Probable cause

VTAM® determined that part of the session path is not HPR capable:

One or more connections between nodes in the session path are not HPR capable.
The session path does not terminate with an HPR tower node. (If the terminating node is VTAM, it must specify the start option HPR=RTP or take the default).
One or more nodes along the path were unable to perform HPR tower function.
The session path enters the subarea and the HPR capable portion of the path ends in an interchange node at the subarea boundary.

User response

Reconfigure the session path to include HPR capable links and terminate with an HPR tower node. Ensure that all nodes in the path are able to perform HPR tower function.