This read-create value configures VSVD closed-loop control external to the segment hosting this connection's two endpoints, meaning the loop control extends toward a CPE or toward another network segment beyond this switch. An admin uses this to extend congestion feedback control beyond the local segment when the ABR connection continues onward to customer equipment or another network segment, complementing the internal VSVD setting. For example, on a multi-segment ABR connection where congestion control needs to reach all the way to the customer's edge device, the admin would enable this external VSVD setting in addition to the internal one.