Independent LUs do not require the services of an SSCP to initiate an LU-LU session. Therefore, they do not have SSCP-LU sessions. Independent LUs can use the services of their local control point to locate and determine a session route to a required session partner.

Independent LUs must be defined at the owning CP. At the owning CP, they are defined as applications or device-type LUs. Independent LUs can be statically defined at non-owning CPs as cross-domain resources (CDRSCs), but this is unnecessary because these resources can be defined dynamically as they are needed. The one exception is when the LU is owned by a LEN node. Because a LEN node cannot register its LUs, these LUs cannot be found as destination LUs if they are not defined in the adjacent VTAM® as CDRSCs with an ALSLST or as LOCADDR=0 LUs under a PU definition.