Abstract: This application provides a communication method, a CP device, and a NAT device; pertains to the field of communication technologies; and relate to a scenario of performing NAT tracing based on a CU-separated BNG. The CP device delivers, to the NAT device, an IP address assigned to a user. Under a trigger condition of receiving the IP address delivered by the CP device, the NAT device assigns a public network IP address to the user, and reports the public network IP address to the CP device. The CP device adds, to an accounting packet, the IP address assigned by the CP device and the public network IP address assigned by the NAT device, and sends the accounting packet to a RADIUS server, to report the public network IP address to the RADIUS server, so that the NAT tracing is performed on the RADIUS server.

Abstract: This application discloses a method and an apparatus for accessing a gateway, and pertains to the field of communications technologies. A service level agreement (SLA) level may be obtained based on user information of a terminal, and further a user plane (UP) device corresponding to the terminal is determined based on the SLA level of the terminal. Thus, terminals with different SLA levels may be allocated to different UP devices for bearing, so that a specific terminal may access a specified UP device. This resolves a problem in a related technology that a terminal relatively randomly accesses a UP device. In addition, because an SLA level may be used to indicate a level of quality of service of a terminal, after terminals with different SLA levels access different UP devices, differentiated services may be provided on the different UP devices. Therefore, user requirements are met, and revenues are increased.

Abstract: A packet processing method and a network device are provided. The method is applied to a network system, and the network system includes a first network device and a plurality of network devices separately connected to the first network device. The method includes: The first network device groups the plurality of network devices into a plurality of groups based on a service, where each of the plurality of groups includes at least one network device. The first network device determines one or more groups in the plurality of groups, and forwards packets of the service to one or more of the plurality of network devices in the one or more groups. In present application, a mode for forwarding the packets of the service can be flexibly selected according to a service requirement, to better meet the service requirement.

Abstract: This application discloses a method for controlling subscriber access to a network, a device, and a system. A control plane device receives a first access request packet of a first subscriber, determines, based on a first correspondence, a first household to which the first subscriber belongs, then determines a first user plane device based on a second correspondence, and indicates the first subscriber to access the network through the first user plane device. The control plane device allocates, to a same user plane device, a subscriber who belongs to a same household and who accesses the network, so that the same user plane device provides a broadband network access service for the subscriber who belongs to the same household and who accesses the network.

Abstract: A method includes receiving a service request, where the service request includes service information of a terminal device that is to perform access; and determining a first device and a first sliced network based on the service information of the terminal device, where the first sliced network is between the first device and a second device, where the service request is forwarded by the second device, and where the first sliced network transmits a data packet of the terminal device.

Abstract: A method includes: receiving a service request, where the service request includes service information of a terminal device that is to perform access; and determining a first device and a first sliced network based on the service information of the terminal device, where the first sliced network is between the first device and a second device, the service request is forwarded by the second device, and the first sliced network transmits a data packet of the terminal device.

Abstract: This application relates to methods, devices, and systems for generating a detection policy. An example method can be applied to a controller. In the example method, the controller obtains path information, where the path information includes information about a first network device, and the first network device belongs to a network device through which a packet passes from a source end to a destination end. The controller generates a detection policy for a second network device based on the path information and delivers the detection policy to the second network device, where the second network device is the same as or different from the first network device.

Abstract: A packet transmission method, device, and system are disclosed, and pertain to the field of network technologies. The system includes a first network device in a VPLS network and a second network device in a VPWS network. The first network device determines, based on a destination address carried in a received first packet, a virtual port corresponding to the destination address in a VPLS instance of the first network device, and sends the first packet to a second VPWS instance in the second network device based on the virtual port, where the virtual port is used to indicate a first VPWS instance in the first network device, and the second VPWS instance and the first VPWS instance are VPWS instances used to bear a same service.

Abstract: A communication method, a device, and a system are disclosed. An SF device adds a first location identifier including an identifier of the SF device and an identifier of a first physical port to a received first packet sent by first user equipment, and sends a second packet to which the first location identifier is added to a first UP device. The first UP device sends a third packet to a CP device, and the CP device sends the third packet to a USF device. The USF device interacts with an SDN controller, to enable the SDN controller to deliver a configuration instruction to the corresponding SF device. The first packet may be a DHCP packet or a PPPoE packet, and OPTION82/OPTION18 is added to carry the first location identifier.

Abstract: This application discloses a communication method, apparatus, device, and system, and a computer-readable storage medium, and relates to the field of communication technologies. The method includes: A CP device receives a first packet that is sent by a first UP device and that carries source information of a first user terminal; searches, based on the source information of the first user terminal, a correspondence between source information of a user terminal and a location identifier of the user terminal accessing a network, to determine a first location identifier of the first user terminal accessing a network; and sends the first location identifier to a USF device.

Abstract: This application discloses a method for controlling user equipment to access a network. After receiving a request packet sent by a gateway control plane device, a control device obtains, by parsing the request packet, a home identifier corresponding to first user equipment. The control device determines, based on the home identifier, a corresponding first target gateway user plane device when the first user equipment goes online, so that a plurality of user equipments corresponding to a same home identifier all go online through the first target gateway user plane device.

Abstract: This application discloses a traffic sending method. The method includes: a control plane device obtains, based on a packet sent by a terminal, a first service function combination corresponding to the terminal, where the first service function combination includes at least one service function. The control plane device configures a first policy on a user plane device based on the first service function combination, the first policy indicates a first service chain, and the first service chain corresponds to the first service function combination. The control plane device sends first user entry information to the user plane device, where the first user entry information includes an identifier of the first policy and an identifier of the terminal, and the first user entry information indicates the user plane device to send traffic from the terminal to the first service chain based on the first policy.

Abstract: This application discloses a communication method, system, apparatus, and device, and a computer-readable storage medium, and belongs to the field of communication technologies. The method includes: When determining that UE is of a first type, a 5GC-CP device delivers a user entry corresponding to the UE to a first fixed network device, where the first fixed network device is a fixed network device corresponding to a first base station accessed by the UE. In this application, the 5GC-CP device enables the fixed network device to forward a packet related to the UE.

Abstract: Embodiments of this application disclose a network traffic migration method and apparatus. The network traffic migration method includes: obtaining a bandwidth usage parameter value of each of M vBNG-UP network elements, where M is an integer greater than 1; when a bandwidth usage parameter value of a first vBNG-UP network element reaches a first threshold, determining a second vBNG-UP network element based on the sum of bandwidths occupied by to-be-migrated network traffic of one or more terminal devices in a first device group on the first vBNG-UP network element and a bandwidth usage parameter value of one or more vBNG-UP network elements in a vBNG-UP network element group; and migrating the to-be-migrated network traffic of the terminal devices in the first device group to the second vBNG-UP network element.

Abstract: A packet transmission method, device, and system are disclosed, and pertain to the field of network technologies. The system includes a first network device in a VPLS network and a second network device in a VPWS network. The first network device determines, based on a destination address carried in a received first packet, a virtual port corresponding to the destination address in a VPLS instance of the first network device, and sends the first packet to a second VPWS instance in the second network device based on the virtual port, where the virtual port is used to indicate a first VPWS instance in the first network device, and the second VPWS instance and the first VPWS instance are VPWS instances used to bear a same service.

Abstract: In a process in which a terminal device accesses a network, if a control plane network element determines that a fault occurs on a steering decision-making network element, to ensure that the terminal device can continue to access the network, the control plane network element may directly control, without decision of the steering decision-making unit, the terminal device to send a data packet through a first user plane network element for a dial-up request.

Abstract: A communication method, a device, and a system are disclosed. An SF device adds a first location identifier including an identifier of the SF device and an identifier of a first physical port to a received first packet sent by first user equipment, and sends a second packet to which the first location identifier is added to a first UP device. The first UP device sends a third packet to a CP device, and the CP device sends the third packet to a USF device. The USF device interacts with an SDN controller, to enable the SDN controller to deliver a configuration instruction to the corresponding SF device. The first packet may be a DHCP packet or a PPPoE packet, and OPTION82/OPTION18 is added to carry the first location identifier.

Abstract: A packet transmission method, device, and system for network technologies are disclosed. A first network device receives, by using a first VPLS instance a packet to be sent to a user-side device connected to the second network device. The first network device forwards, based on an association relationship between the first VPLS instance and the first VPWS instance, the packet to a second VPWS instance in the second network device by using the first VPWS instance. A VPLS instance is associated with a VPWS instance in the first network device. A packet that is received by using the VPLS instance and that is to be sent to a user-side device can be forwarded by using the associated VPWS instance, so that pressure to learn a MAC address for packet transmission is reduced, and forwarding performance of the system is ensured.

Abstract: A method for accessing a gateway and an apparatus are disclosed, relate to the field of communication technologies, and are applied to a network system including a virtual broadband network gateway (vBNG), where the vBNG includes a control plane (CP) device and a plurality of user plane (UP) devices managed by the CP device, and the network system further includes a user plane steering function (USF) device. The method includes: The USF device obtains user information of a target terminal; the USF device determines a target UP device in the plurality of UP devices based on the user information and load of the plurality of UP devices; and the USF device indicates the target terminal to access the target UP device. Therefore, an appropriate UP device is selected for the target terminal in the network system including the vBNG, and load balancing between the plurality of UP devices is implemented.

Abstract: This application provides a communication method, a CP device, and a NAT device; pertains to the field of communication technologies; and relate to a scenario of performing NAT tracing based on a CU-separated BNG. The CP device delivers, to the NAT device, an IP address assigned to a user. Under a trigger condition of receiving the IP address delivered by the CP device, the NAT device assigns a public network IP address to the user, and reports the public network IP address to the CP device. The CP device adds, to an accounting packet, the IP address assigned by the CP device and the public network IP address assigned by the NAT device, and sends the accounting packet to a RADIUS server, to report the public network IP address to the RADIUS server, so that the NAT tracing is performed on the RADIUS server.