This read-create value configures VSVD closed-loop control internal to a segment, meaning the loop control takes effect between the two provisioned endpoints of this SPVC. An admin uses this to control congestion feedback scope specifically within this switch's segment of an SPVC, as distinct from control extending outside the segment, which is handled by cwaChanExtAbrVSVD. For example, if congestion control is desired only between the two endpoints managed directly on this switch, the admin would enable this internal VSVD setting rather than relying on end-to-end control across the whole network path.