35 results about "Multicast packets" patented technology

This application provides a method, device, and system for forwarding BIER packets. The method includes: a first network device receiving a BIER packet sent by a second network device. The BIER packet includes an IPv6 header, a BIER header, and a multicast packet. The destination address in the IPv6 header or a first field in the BIER header carries a service identifier, which is used to identify a Virtual Private Network (VPN) instance. The first network device determines a Virtual Private Network (VRF) table based on the service identifier and a first correspondence, whereby the first correspondence includes the correspondence between the service identifier and the VRF table. The first network device then sends a multicast packet to a first User Edge (CE) device listed in the VRF table. The technical solution provided by this application is relatively simple to implement when the egress edge device identifies a VPN instance.

A wireless communication method includes: obtaining subnet information of a first subnet corresponding to a first session; receiving a data packet, where the data packet is a multicast packet or a broadcast packet; determining, based on the subnet information, that the data packet corresponds to the first session in the first subnet; and sending the data packet via the first session.

The invention relates to a Qt-based ship navigation information simulation method, which aims at solving the problem of lack of real navigation information during single-machine debugging of a ship shell sonar, and specifically comprises the following steps of: receiving motion parameters and mode selection by constructing a graphical user interface; a timer is used for triggering, and coordinate conversion and data updating are carried out according to a constant-speed direct navigation, circular motion or motion trail binding model; and packaging the updated navigation parameters by adopting a multi-thread technology and a signal slot mechanism, and sending the packaged updated navigation parameters in the form of a UDP multicast data packet. According to the method, the dynamic navigation information of the ship can be simulated with high simulation degree, a reliable test data source is provided for the ship shell sonar, single-machine debugging of the ship shell sonar is effectively supported, and the on-ship joint debugging period is shortened.

This application provides a method and device for achieving fast traffic convergence. The method includes: selecting a primary next hop and a backup next hop from multiple next hops in a VXLAN tunnel based on the device type; setting the primary next hop to a forwarding state and the backup next hop to a discard state in the multicast table entry of the VXLAN tunnel; registering a port close event for the VXLAN tunnel; forwarding broadcast packets, unknown unicast packets, and multicast packets within the virtual forwarding instance through the primary next hop of the VXLAN tunnel; and when a port close event is received from the outgoing port of the primary next hop, setting the primary next hop to a discard state and setting the backup next hop to a forwarding state.

The invention discloses a novel multi-subnet multicast tree construction and multicast data transmission method and device, and belongs to the technical field of wireless communication ad hoc networks, and the method comprises the steps: constructing an intra-subnet minimum-cost multicast tree based on least relay nodes in a current subnet under the constraint condition in the subnet; constructing an inter-subnet minimum-cost multicast tree which reaches a target subnet and is based on the least cross-network relay nodes under the condition that the inter-subnet constraint condition is met; combining the intra-subnet minimum cost multicast tree and the inter-subnet minimum cost multicast tree together to form a plurality of inter-subnet layered multicast trees; generating a multicast data packet according to the data required to be multicast, and transmitting the multicast data packet according to a relay node formed by the multi-subnet layered multicast tree; the multicast loop problem and the data message redundancy problem in multiple subnets are effectively solved, so that the network bandwidth utilization rate is improved.

A multicast packet transmission method and an apparatus are disclosed, and relate to the field of communication technologies. In the method, a first node may send, to a second node, first multicast routing information that includes multicast routing information of the second node and multicast routing information of a third node, and first positioning information that is for determining the multicast routing information of the second node. In this way, after receiving the first multicast routing information and the first positioning information, the second node determines, based on the first positioning information, the multicast routing information of the second node from the first multicast routing information. In this application, the first node does not need to split the first multicast routing information for the second node, to obtain the multicast routing information of the second node. In this way, a quantity of times of splitting and editing a multicast packet is reduced, and multicast packet forwarding efficiency is improved.

Optimizing network load in multicast communications including receiving, at a first interface of a first router from a second router, a multicast packet for a multicast group; determining whether a time to live (TTL) value of the multicast packet is equal to zero; and sending, in response to determining that the TTL value of the multicast packet is equal to zero, a Protocol Independent Multicast prune message on the first interface of the first router, wherein the Protocol Independent Multicast prune message comprises a request to stop receiving multicast traffic for the multicast group.

A first network device receives a BIER packet sent by a second network device, where the BIER packet includes an IPv6 header, a BIER header, and a multicast packet, a destination address of the IPv6 header or a first field of the BIER header carries a service identifier, and the service identifier identifies a virtual private network VPN instance. The first network device determines a VRF table based on the service identifier and a first correspondence, where the first correspondence includes a correspondence between the service identifier and the VRF table. The first network device sends the multicast packet to a first CE device in the VRF table based on the VRF table.

The present disclosure relates to multicast packet processing methods. One example method includes obtaining a first multicast packet, where destination information of the first multicast packet includes a first identifier indicating link information, a second identifier indicating a replication and forwarding operation, and a third identifier used to index destination information corresponding to a second node, obtaining a second multicast packet based on the first multicast packet and the third identifier, obtaining a third multicast packet, where destination information of the third multicast packet is destination information corresponding to a third node that is determined based on a destination information index corresponding to a multicast packet obtained after the first multicast packet is replicated, sending the second multicast packet to the second node based on the first identifier, and sending the third multicast packet to the third node based on the destination information of the multicast packet.

The invention discloses a method for ensuring the reliability of multicast transmission, which belongs to the technical field of local area networks, and comprises the following steps: step 1, a sender allocates a globally unique and progressively increasing serial number for each multicast data packet, and adds FEC (Forward Error Correction) redundant code in multicast data; 2, a receiver receives a multicast data packet, records continuous serial numbers through a sliding window, traverses the serial numbers in the sliding window, judges whether the serial numbers are continuous or not, if yes, it is judged that packet loss does not occur, the step 7 is executed, and if not, the step 3 is executed; 3, the receiver identifies redundant packets for receiving the multicast data packets according to the FEC redundant codes, counts the number of the redundant packets and judges whether the number of the redundant packets is larger than or equal to a threshold value or not, if yes, local error correction is carried out to recover data, then the step 7 is executed, and if not, the step 4 is executed. According to the method, the'confirmation storm 'is inhibited fundamentally, and the efficient balance of the network load is realized.

The embodiment of the application belongs to the technical field of data communication of artificial intelligence, and relates to a data packet playback method and device, a computer device and a storage medium. The method comprises the following steps: calling a tcpdump packet capturing tool to obtain TCP data packets and multicast packets in communication between a client and a server; calling a simulation server and playing back the TCP data packets according to the simulation server; after receiving a client packet sent by the current client for the played back TCP data packet, performing a user authentication operation on the client packet to obtain an authentication result; if the authentication result is not passed, sending a re-authentication signal to the current client and re-receiving the client packet sent by the current client; if the authentication result is passed, including the current client in a multicast group; and sending the multicast packet to the clients in the multicast group. The application adds TCP authentication, and only when the authentication is passed, the client can join the server multicast group address range and receive the multicast packet sent by the server.

Disclosed in the embodiments of the present application are a packet transmission method, a related device, and a system, which are applied to the technical field of network communications and are used for implementing an RDMA multicast function and improving the performance of single-point-to-multi-point transmission. In the present application, a first network device receives a first packet from a first computing device, the first computing device being connected to the first network device, the first computing device being a multicast source in a multicast group, and the first packet carrying first identification information; and, on the basis of the first identification information, the first network device sends to a second network device a second packet, the second packet being obtained by the first network device by means of replacing the first identification information in the first packet with second identification information, and the second identification information being used for indicating that the second packet is a multicast packet. On the basis of the first identification information, the first network device modifies the first packet to obtain the second packet used for multicast, thereby implementing a multicast function. As the first computing device does not need to duplicate a packet into multiple copies, the efficiency of single-point-to-multi-point transmission is improved.

A communication system 1 includes relay devices 20 and 30 that participate in an IP multicast network. The relay device 20 receives a multicast packet from a terminal 10 and sends out the multicast packet to the IP multicast network. The relay device 30 receives the multicast packet and distributes the multicast packet to a terminal 40. The relay device 30 holds membership information that associates a process with a multicast group in which the process participates, and connection information that associates a process with a connection established between the process and the relay device 30. The relay device 30 receives a multicast packet, refers to membership information to extract processes associated with a multicast group of the multicast packet, refers to connection information for each of the extracted processes to extract a connection associated with that process, and, using each of the extracted connections, converts and forwards the multicast packet so that the multicast packet can be transmitted via that connection.

The present application relates to the technical field of wireless communication, and in particular to a system and method for cluster fast communication based on mixed mode, which comprises N STA nodes, an AP, a cloud server, the N STA nodes are used for receiving data sent by the AP, the AP and the cloud server are connected with each other, wherein the STA nodes are in the mixed mode, and all communication data of a set protocol is acquired; the AP is used for sending a communication data packet in the format of a data frame in the set protocol; and the cloud server is used for sending a UDP multicast packet with a set timing as an interval.

IP multicast is transmitted wirelessly from a transmitting device to a receiving device with stable transmission quality. [Solution] An IP multicast wireless transmission system transmits IP multicast packets from a transmitter to one or more receivers via unidirectional communication. The transmitter and receiver are equipped with wireless communication units for WHDI or WirelessHD transmission, which transmit and receive video signals via radio waves. The system also includes a first control device that encapsulates IP multicast packets in a video signal format transmittable via WHDI or WirelessHD transmission and outputs the encapsulated data to the transmitter, and a second control device that extracts IP multicast packets from the video signal output from the receiver. Data is sent using FEC, which corrects errors that occur on the transmission path between the transmitter and receiver at the receiver side.

Embodiments of this application provide a communication method and a related apparatus, to meet a multicast service data packet transmission security requirement. An access device may determine a user plane security active state of a multicast data radio bearer (DRB) in a protocol data unit (PDU) session, and indicate the user plane security active state of the multicast DRB to a terminal. The user plane security active state includes whether integrity protection is activated and / or whether confidentiality protection is activated. In addition, the access device configures a multicast packet data convergence protocol (PDCP) layer entity based on the user plane security active state of the DRB for transmitting multicast service data. The access device may further determine a user plane security active state of a unicast DRB, indicate the user plane security active state to the terminal, and modify a unicast PDCP layer entity.

A wireless communication method includes: obtaining subnet information of a first subnet corresponding to a first session; receiving a data packet, where the data packet is a multicast packet or a broadcast packet; determining, based on the subnet information, that the data packet corresponds to the first session in the first subnet; and sending the data packet via the first session.

Systems, methods, apparatuses, and computer program products for distributing multicast packets in individual protocol data unit (PDU) sessions are provided. One method may include receiving, at a user plane node, a request from a session management node, to receive packets for a multicast session and / or to send packets from the multicast session within a protocol data unit (PDU) session. The method may also include determining whether the user plane node was already configured to receive incoming packets for the multicast session, and informing the session management node as to whether the user plane node was already configured to receive the incoming packets for the multicast session.

A multicast communication method is applied to a software-defined wide area network SD-WAN. In the multicast communication method, a bit index explicit replication (Bit Index Explicit Replication, BIER) capability is deployed on site devices in the SD-WAN, a BIER header in a multicast packet indicates a site device that a multicast packet needs to pass through, and no multicast distribution tree need to be constructed. In addition, the multicast packet is forwarded through an SD-WAN tunnel between site devices, and an intermediate node does not need to sense a multicast service, to reduce a quantity of multicast table entries on a network device and accelerate convergence of the multicast table entries, so that normal running of the multicast service is ensured.

It enables IP multicast from a transmitting device to a receiving device via wireless communication, providing stable transmission quality. [Solution] The IP multicast wireless transmission system transmits IP multicast packets from a transmitting device to one or more receiving devices via unidirectional communication. The transmitting device and receiving device are equipped with wireless communication units using a WHDI transmission method or WirelessHD transmission method for transmitting and receiving video signals using radio waves. The system includes a first control device that encapsulates IP multicast packets into a video signal format that can be transmitted using the WHDI transmission method or WirelessHD transmission method and outputs it to the transmitting device, and a second control device that extracts IP multicast packets from the video signals output from the receiving device. Data transmission is performed using an FEC method in which errors occurring in the transmission path between the transmitting device and the receiving device are corrected on the receiving device side.

A method for sending a multicast packet and a related apparatus are provided. The method includes: a first network device obtains a first multicast packet, wherein the first multicast packet includes a bit string and an identifier of a network slice, the bit string corresponds to a second network device, and the network slice corresponds to a multicast service of the second network device. The first network device obtains, based on the bit string and the identifier of the network slice, a first interface corresponding to the network slice. The first network device sends the first multicast packet to the second network device by using the first interface.

The application relates to a dynamic optimization device response method based on a local area network in a network distribution process, which comprises the following steps: after a device accesses the local area network, the device sends a multicast packet to a service end in the local area network to declare that the device accesses the local area network; the service end sends a response request to each device in the local area network through a UDP multicast; the network state parameter data of each device in the local area network is monitored in real time; a response delay time window prediction model is constructed, the network state parameter data of each device is input into the response delay time window prediction model, and the response delay of each device is obtained; when the device receives the response request, the device waits according to the predicted response delay and then responds; after the service end receives the response, the service end sends an ACK to the corresponding device; if the device does not receive the ACK within a preset time, a retransmission process is executed until the device receives the ACK within the preset time or reaches a preset maximum retransmission number.

Embodiments of the present application provide a packet generation method, a multicast packet transmission method, a network device, a computer readable storage medium, and a computer program product. The packet generation method is applied to a multicast network. The method comprises: adding at least one piece of the following information into a protocol independent multicast (PIM) join packet: network slice information; and network topology information.

A method comprising: receiving information from a Session Management Function; determining, from the information, to transmit to a Radio Access Network node at least one of a message and an information element, the at least one of the message and the information element comprising a sequence number of a last transmitted (or next to be transmitted) user plane Protocol Data Unit carrying a valid user plane payload of a Quality of Service Flow of a Multicast and Broadcast Services multicast session; and transmitting at least one of the message and the information element to the Radio Access Network node while no downlink multicast packet in the Multicast and Broadcast Services multicast session is available for transmission to the Radio access Network node.

The present application discloses a multicast port number allocation method and apparatus, a device, a storage medium, and a program product. The method comprises: a first node receiving a multicast packet carrying a first SID, the first SID being configured for identifying an automatically assigned multicast port number; and the first node assigning a first receiving port number to the multicast packet on the basis of the first SID. A second node receiving a multicast packet carrying the first SID, the first SID being configured for identifying the automatically assigned multicast port number; the second node performing a lookup in a second mapping table on the basis of the first SID, and modifying a destination port number in the multicast packet to a receiving port number obtained by means of table lookup; and the second node sending the modified multicast packet.

The invention belongs to the technical field of communication fault positioning, and provides a rail transit vehicle equipment communication fault positioning method and system and a vehicle, and the method comprises the steps: responding to a detection signal of a communication fault of terminal equipment, and obtaining a network connection port state of the corresponding terminal equipment; if the state of the network connection port is communication disconnection, the duplex rate of the network connection port is set to be in an auto-negotiation state, if the state is changed, the final duplex rate parameter is incorrect, and otherwise, the parameter of the MDIX mode is modified; if the state of the network connection port is that the communication connection is successful, calculating the number N1 of multicast data packets sent by the terminal equipment and the number N2 of received data packets within each set time period under the normal condition of the network connection port; calculating and judging the number N of data packets increased in a set time period before a communication fault; and comparing, and determining a fault item existing in the terminal equipment according to the numerical relationship between N and N1 and N2, thereby realizing positioning. According to the invention, accurate positioning of the final fault reason is realized.

The invention discloses a multicast method, device and system, a storage medium and a computer program product, and belongs to the technical field of communication. A multicast system comprises a source end and a plurality of destination ends, and the method comprises the following steps: the source end encrypts a plurality of sub-message headers of a multicast message by using a plurality of private keys and encrypts a message load of the multicast message by using a public key, one sub-message header corresponds to one destination end, and different destination ends correspond to different private keys; each sub-message header is encrypted by using a private key of a corresponding destination end, and each private key and each public key are symmetric keys; and the destination end obtains the corresponding encrypted sub-message header and the encrypted message load sent by the source end, decrypts the corresponding encrypted sub-message header by using the corresponding private key, and decrypts the encrypted message load by using the public key. The symmetric encryption has low requirements on software and hardware, the multicast efficiency is higher, and the privacy and multicast security of the destination end are enhanced by the hybrid encryption.

The application discloses a PCIe switch multicast processing system and method considering efficiency and resources, comprising a unicast control module, a multicast control module and a target port arbitration module.The unicast control module is used for receiving target port information of a unicast TLP packet, TLP indication signals, TLP header information and TLP load data, and issuing a unicast request.The multicast control module is used for receiving a target port list of a multicast TLP packet, TLP indication signals, TLP header information and TLP load data, and issuing a multicast request.The target port arbitration module is used for receiving the unicast request and the multicast request, and sending a request packet corresponding to the unicast request or the multicast request to a sending cache module.The sending cache module is used for receiving an authorized unicast TLP packet or a multicast TLP packet, caching the unicast TLP packet or the multicast TLP packet, and sending the unicast TLP packet or the multicast TLP packet to an egress end of a target port.The application concentrates multicast packet processing on an ingress end of a PCIe port, separates unicast packets and multicast packets for processing, opens two parallel processing channels in the multicast control module, and realizes multicast packet copying through a rollback FIFO read-write pointer mode, so that the design is simplified, resources are saved, and efficiency is improved.

A data transmission method and an apparatus are applied to a vehicle that includes at least one vehicle integration unit (VIU). A communication connection is established between the at least one VIU and a control device, and the control device and the at least one VIU access a same multicast group. The data transmission method includes: obtaining, by a first VIU, monitored information, where the first VIU is any one of the at least one VIU; and transmitting, by the first VIU, a multicast packet using the multicast group, where the multicast packet includes the information monitored by the first VIU. The control device obtains the multicast packet by monitoring the multicast group, and uses multicast packet to analyze a status of the vehicle.