The setting of the CDRSCTI start option controls the amount of time that a dynamic CDRSC is retained by VTAM® after its last session ends.

However, dynamic CDRSCs representing APPN resources are freed by an interchange node immediately after the last session ends, regardless of the specified CDRSCTI value. This is because APPN directory services in the interchange node has an entry for each APPN resource.

Dynamic CDRSCs representing subarea resources are retained for eight minutes (by default). You can increase the CDRSCTI start option value to minimize the potential for unnecessary broadcasts of the APPN network for subarea resources.

For further information about the CDRSCTI start option, see Controlling searches.