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 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 BRAS system-based packet encapsulation method includes obtaining user access information when receiving a user access protocol packet and performing VXLAN GPE encapsulation on the user access protocol packet based on the user access information. The encapsulation structure includes a user information header that is used to store the user access information, and a quantity of bytes occupied by the user information header is less than or equal to 12. In this application, the foregoing encapsulation structure is used to encapsulate a packet.

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: 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 broadband connection method includes a virtual broadband network gateway (vBNG)-control plane (CP) that receives first indication information from a user plane selection function (USF), where the first indication information indicates a second vBNG-user plane (UP) that replaces a first vBNG-UP when the first vBNG-UP is faulty. The vBNG-CP sends a user entry to the second vBNG-UP based on the first indication information, where the user entry is used by the second vBNG-UP to enable a user to access a network based on the user entry when the first vBNG-UP is faulty such that when a user plane is faulty, broadband access of a user is not interrupted, and the user can continue to access a network.

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: Embodiments of this application disclose a tunnel keepalive method, a network device, a system, and a storage medium, and pertain to the field of communications technologies. In the embodiments of this application, before a failure occurs in communication between a UP device and a CP device, the UP device receives tunnel information synchronized by the CP device. After a failure occurs in communication between the UP device and the CP device, the UP device performs tunnel keepalive based on the tunnel information, that is, the UP device maintains a tunnel between the UP device and a remote network device. In this way, tunnel teardown is not triggered because of the failure in communication between the CP device and the UP device.

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: A BRAS system-based packet encapsulation method includes obtaining user access information when receiving a user access protocol packet and performing VXLAN GPE encapsulation on the user access protocol packet based on the user access information. The encapsulation structure includes a user information header that is used to store the user access information, and a quantity of bytes occupied by the user information header is less than or equal to 12. In this application, the foregoing encapsulation structure is used to encapsulate a packet.

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: The technology of this application relates to a service processing method. A network device stores a control policy, and the control policy includes a correspondence between application feature information and an execution action. After receiving a service packet carrying the application feature information, the network device determines the corresponding control policy based on the application feature information, and processes the service packet based on the execution action in the determined control policy. In this way, by storing the control policy in the network device, the network device may determine, based on the control policy stored by the network device and for the service packet carrying the application feature information, the execution action used to process the service packet, to implement application-level service processing.

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 provides a packet processing method, a UP device, and a CP device, and belongs to the field of communication technologies. In the method, when receiving a packet, a UP device matches information in the packet with information about a user having a fixed IP address. If the matching succeeds, the UP device sends the packet to a CP device.

Abstract: This application provides a communication method, a UP device, and a CP device, and pertains to the field of communications technologies. In the method, the UP device reports interface information to the CP device by using PFCP. Specifically, the UP device carries the interface information in a PFCP message, and transmits the PFCP message to the CP device. The CP device can obtain the interface information of the UP device from the PFCP message, which ensures that the CP device can sense the interface information of the UP device.

Abstract: A BRAS system-based packet encapsulation method includes obtaining user access information when receiving a user access protocol packet and performing VXLAN GPE encapsulation on the user access protocol packet based on the user access information. The encapsulation structure includes a user information header that is used to store the user access information, and a quantity of bytes occupied by the user information header is less than or equal to 12. In this application, the foregoing encapsulation structure is used to encapsulate a packet.

Abstract: This application provides a packet transmission method, apparatus, and system, and relates to the field of network technologies. The method is applied to a network architecture including a user terminal, a first forwarding device and a second forwarding device. A tunnel is disposed between the first forwarding device and the second forwarding device. The method includes: The first forwarding device receives packets forwarded by the user terminal in the load balancing mode, where the packets include a keepalive packet, and the first forwarding device is a standby forwarding device corresponding to the user terminal. The first forwarding device forwards the keepalive packet to the second forwarding device through the tunnel, where the second forwarding device is an active forwarding device corresponding to the user terminal.