Each cross-domain resource (CDRSC) definition statement indicates its controlling SSCP (CDRM=cdrmname). The controlling SSCP is also called the owning CDRM of the cross-domain resource. The ownership of a cross-domain resource can be changed if the owning CDRM loses its SSCP-LU session with the logical unit, and another SSCP takes over the logical unit. For information about resource takeover, see Steps for resource takeover.

You can use the MODIFY CDRM command to inform VTAM® of the takeover, naming the new owner of the cross-domain resource. This command can be used whether the cross-domain resource is active or inactive. If the cross-domain resource is already in session with a logical unit, the session is undisturbed and the owner is saved until the session terminates. Session startup requests continue to be routed to the old owner. Specifying TYPE=IMMED on the MODIFY CDRM command can be used to force the ownership change immediately regardless of active sessions.