Abstract: A transmission management method, used for calculating a virtual lease line (VLL), the method includes: providing a user interface for input a start area and an end area of the VLL; receiving a request including the start area and the end area; determining whether there is a port of a router device located on the start area is directed to the end area; if not, determining whether there is a port of a default router device directed by the router device by default is directed to the end area; determining the router devices constituting the VLL when determining there is a router device is directed to the end area; and determining which ports of the router devices are ports to be connected to another port, and producing VLL information including the router devices constituting the VLL and the ports to be connected.

Abstract: An on-demand transmission path providing method includes: receiving a virtual lease line (VLL) establishing request including a start area and an end area of the VLL and an establishing duration of the VLL; producing a VLL establishing information including a connection relationship of router devices constituting the VLL and ports of the router devices to be connected; assigning a timed task for the VLL according to the establishing duration, therein, the timed task includes a start time and an end time when establishing the VLL; judging whether current time reaches to the beginning time of the timed task; and establishing the VLL if yes.

Abstract: A transmission path control system includes a management server and a number of path control device connected to the management server, each path control device is connected to one corresponding router device and located in the same area as that of the corresponding router device. The management server can transmit a virtual lease line (VLL) establishing request comprising information of a start area and an end area of the VLL to one of the path control devices when the management server receives the VLL establishing request from a user, the corresponding path control devices determines which router devices are transmission nodes constituting the VLL according to the start area and the end area, and establishes the VLL by connecting corresponding ports of the router devices determined as the transmission nodes constituting the VLL.

Abstract: A network system capable of enhancing connection performance includes a first connection object, a second connection object, and a virtual lease line (VLL) network. The VLL network includes a number of router devices, a number of path control devices, and a management server. Each router device is coupled to one corresponding path control device, and each router device and the corresponding path control device are located in one corresponding area. The management server is coupled to all of the path control devices; the management and the path control devices establish a VLL constituted by a number of router devices according to areas in which the first connection object and the second connection object locates. The first connection object and the second connection object are coupled to each other and communicate with each other via the VLL established in the VLL network.

Abstract: A transmission path management method, configured to establish a virtual lease line (VLL), the method includes: assigning configuration information to ports to be connected according to VLL information including each router device determined as transmission nodes of the VLL and the ports to be connected, the configuration information comprising a VLL identifier code; labeling the ports used to connect of each router device by using the VLL identifier; and connecting the ports labeled the VLL identifier one by one to establish the VLL.

Abstract: A transmission path control device is connected to a management server and a router device located on the same area as the transmission path control device. The transmission path control device determines whether a corresponding router device has a port directed to an end area when receiving a virtual lease line (VLL) establishing request including a start area and the end area of the VLL. If not, the transmission path control device transmits the VLL establishing request to a default transmission path control device. If yes, the transmission path control device determines which router devices are transmission nodes constituting the VLL and determines which ports are ports to be connected. The transmission path control device further connect the ports used to connect one by one, thus to establish the VLL.

Abstract: A transmission path management device includes a communication unit, a storage unit, and a processor. The communication unit is used to connect to a number of path control devices located in different areas. The processor is used to run a number of modules including an interface providing module to provide a user interface provided for a user to input a start area and an end area of a virtual lease line (VLL) to be established; a request receiving module to receive a VLL establishing request; an assignment module to assign a VLL identifier code to the VLL to be established; and a sending module to send the VLL establishing request and the VLL identifier code to the path control device located in a start area, thus to trigger the path control device located in the start area and related path control devices to determine and establish the VLL.