Abstract: A method for acquiring a virtual private network (VPN) label is provided, in which the VPN is based on a multi-protocol label switching (MPLS) network. The method includes: acquiring VPN routing information; parsing the VPN routing information to obtain a VPN identifier, an upper-level router device identifier, and a receiving label; and acquiring a forwarding label according to the VPN identifier, the upper-level router device identifier, and the receiving label. The method is applied to an autonomous system boundary router (ASBR) device.

Abstract: A method for a network device to access a packet switched network is applied to a system in which the network device accesses the packet switched network by connecting to PEs in an active-standby mode. The method includes: an active PE and a standby PE each sends a fault detection message to the network device through an interface connected to the network device; the active PE sets the state of the interface to “up” and advertises a route to a remote PE if a fault detection response returned by the network device is received through the interface within a preset period; otherwise, the active PE sets the state of the interface to “down”, and withdraws the advertised route; and the standby PE sets the state of the interface to “up” and advertises another route to the remote PE after receiving a fault detection response through the interface connected to the network device.

Abstract: A method and a system for sampling a packet as well as a device are disclosed herein. The method includes the following steps: a notification node of an LSP sends obtained information about the protocol type of a packet to a specific netflow sampling entity; the netflow sampling entity determines the protocol type of the packet according to the information about the protocol type after receiving the packet, and samples the packet according to the determined protocol type. Through the embodiments of the present invention, the accuracy of netflow sampling is improved significantly.

Abstract: A dynamic optimization searching method for a torque servo loading device of an engine is disclosed, the torque servo loading device includes a motor, a torque servo driver, a primary control unit, and a mass flow sensor; the primary control unit stores therein an optimal efficiency operation curve of the engine and data of fuel consumption value per unit of mechanical power of the engine at each point on the curve; the method includes: detecting current operation parameters of the engine; making the engine operate according to the current optimal efficiency operation curve; changing the current optimal fuel efficiency torque by an optimization searching step to obtain an optimization searching torque; making the engine operate for an optimization searching measurement-calculation time period under the optimization searching torque; calculating the fuel consumption value per unit of mechanical power of the engine; comparing the calculated fuel consumption value per unit of mechanical power with a stored fuel

Abstract: A fuel engine servo loading device is disclosed, which comprises a permanent magnet machine having a first rotor and a second rotor, the first rotor of the machine is directly connected with the output shaft of the fuel engine, the second rotor of the machine is directly connected with a driving shaft, power is transmitted between the first rotor and the second rotor via electromagnetic coupling, characterized in that, the fuel engine servo loading device further comprises a servo driver, which controls the electromagnetic torque between the first rotor and the second rotor according to set conditions so as to control the torque load of the fuel engine and the output torque of the driving shaft; wherein, a speed/position sensor is provided on the first rotor shaft, and a position sensor is provided on the second rotor shaft for performing torque servo control; and a conductive slip ring is provided on the rotor shaft at which an armature winding is mounted, wherein the conductive slip ring connects the windin