To define one or more cross-domain resource (CDRSC) major nodes, code a VBUILD definition statement, an optional GROUP definition statement, and a CDRSC definition statement for each minor node.
In an SNA-interconnected network, define a CDRSC major node with a VBUILD definition statement, optional NETWORK definition statements, and one or more CDRSC definition statements.
If VTAM® is part of a multiple-domain network, two definitions with the same resource name (a logical unit and a CDRSC) can co-exist. In a backup and recovery situation where one host is assuming ownership of a logical unit from another host in the same network, the logical unit can be activated by the new host even though an application program within it currently has a cross-domain session with the logical unit. If the physical units and logical units being recovered support ACTPU(ERP) and ACTLU(ERP) requests, the sessions with the logical units are not affected when the physical units and logical units are activated. The CDRSC definition automatically becomes a shadow resource and the logical unit is now defined as a same-domain (APPL, LU, or LOCAL) resource. If the current host relinquishes ownership of the logical unit, it does so by releasing or deactivating the logical unit and its associated physical unit, causing VTAM to activate its CDRSC again, making it a cross-domain resource.