107 results about "Protocol Independent Multicast" patented technology

A networking services architecture is provided in which several communication media and protocols are supported. In commonly used communications middleware, the routing specification and messaging interface provided to a client application may depend on the communications protocol used. The client's interface is independent of the communication protocols supported for internode message delivery, and the routing specification is also independent of the number and type of communication protocols supported. For instance in a communication system, node A and node B could be connected using IP (Internet Protocol), while node B and node C could be connected using synchronous pooling. The routing specification is independent of these details since nodes are identified in a protocol independent manner.

A system architecture is described for supporting protocol independent multicast routing and local group membership multicast protocols concurrently and consistently within a multi-cast border router on a packet switched network.

A network node, configured for interfacing between a source network having a source telephony protocol and a packet network configured for sending and receiving data according to Internet Protocol, is configured for generating an IP based transport message for transport of normalized information describing a signaling message received from the source network according to the source telephony protocol. The network node is configured for generating a generic transparency descriptor having generic attributes for describing the signaling message. The generic attributes include a protocol name that specifies the source telephony protocol relative to a prescribed set of source telephony protocol types, and a message identifier that specifies the message type according to the source telephony protocol. Optional attributes specifying respective parameters based on the particular signaling message also may be generated. The network node outputs the transport message having the generic transparency descriptor, enabling any node receiving the transport message to determine whether signaling operations specified by the signaling message can be executed, or whether alternate operations substituting for the signaling operations can be performed based on the generic transparency descriptor.

Disclosed in the present invention are a failure notification method, detection apparatus, forwarding apparatus, system and data structure. The failure notification method comprises: detecting whether a failure occurs in the main path of Internet Protocol (IP) multicast tree forwarding paths which are established based upon Protocol Independent Multicast protocol; when a non-switch node in the main path detects that a failure occurs in the main path, obtaining the failure information, and encapsulating the failure information in a failure notification massage; transmitting the failure notification massage to a switch node in the main path. According to above technical solution, in the failure notification method disclosed in the embodiments of the present invention, when the non-switch node detects that a failure occurs in the main path of the IP multicast tree forwarding paths, a failure notification message is transmitted to the switch node in the main path. Compared with the prior art, when the non-switch node detects that a failure occurs in the main path of the IP multicast tree forwarding paths, there is no need to transmit failure notification messages to all nodes in the multicast network which the IP multicast tree belongs to, and therefore the number of invalid messages is reduced.

The invention discloses a multicast cutting method, a protocol independent multicast (PIM) router, and a two-layer exchanger. A multicast source is connected to a first jump PIM router through the two-layer exchanger. The method comprises the following steps that: after receiving a multicast flow transmitted from the multicast source, the first jump PIM router determines that there is no need for receiving the multicast flow; or after receiving a PIM cutting message for a multicast flow transmitted by a downstream PIM router or receiving a multiple management departure message for a multicast flow transmitted by a suspension client thereof, the first jump PIM router determines that there is no need for receiving the multicast flow and then transmits the PIM cutting message outwards from a multicast flow access interface. In the invention, useless multicast flows between the multicast source and the first PIM router are cut.

An embodiment of the invention discloses a method, a device and a system for creating bidirectional multicast distribution trees on the basis of an interior gateway protocol, and relates to the technical field of communication. The technical scheme includes that the method comprises receiving a root address of at least one first node and a multicast group range supported by the first node; generating shortest paths from each first node, which is used as a source node, to other nodes according to the corresponding root address and a shortest path tree algorithm, and creating flooding trees according to the shortest paths; determining flooding trees corresponding to various three-layer multicast groups according to three-layer multicast group information and the multicast group ranges supported by the first nodes when the three-layer multicast group information is received, and generating the bidirectional multicast distribution trees for the flooding trees corresponding to the various three-layer multicast groups according to the three-layer multicast group information. The root addresses of the first nodes are transmitted by the first nodes by means of flooding. The three-layer multicast group information is transmitted by edge nodes by means of flooding. The method, the device and the system have the advantage that the problem of complexity in operation and maintenance due to the fact that a PIM (protocol independent multicast) routing protocol and a unicast routing protocol which is an IGP (interior gateway protocol) need to be simultaneously operated and maintained in multipoint-to-multipoint multicast scenes can be solved.

A Join message load control system in a network using a Protocol Independent Multicast-Source Specific Multicast (PIM-SSM) protocol, the Join message load control system including a source access hop router creating a SOURCE-INACTIVE message and transmitting the created SOURCE-INACTIVE message when a multicast traffic is not received from the multicast server during a set Keep-Alive Time (KAT), and the SOURCE-INACTIVE message including information on an update set time of a PIM Join message; and a group access hop router resetting the update set time of the PIM Join message when the SOURCE-INACTIVE message is received from the source access hop router. Accordingly, it is possible to reduce the periodical transmission of unnecessary Join(S, G) messages and thereby reduce traffic load in a network by adjusting a JP timer of the Join(S, G) message depending on whether a channel(S, G) is active or inactive.

In a source provider edge (PE) router, a method for supporting protocol independent multicast sparse-mode (PIM-SM) using multicast resource reservation protocol-traffic engineering (mRSVP-TE) comprising the steps of creating a protocol independent multicast (PIM) state, sending a first unicast data message to a rendezvous point (RP) PE router using the PIM state, wherein the first unicast data message is a PIM register message encapsulated as a unicast multiprotocol label switching (MPLS) packet, receiving a PIM join message from the RP PE router, wherein the PIM join message triggers creating a second PIM state, sending a second unicast data message to the RP PE router via a default multicast distribution tree (MDT) using the second PIM state, receiving a PIM register-stop message from the RP PE router, wherein the PIM register-stop message suspends sending the second unicast data message.

The invention discloses a method for protecting DR (designated router) redundancy in PIM-SM (protocol independent multicast-sparse mode), which sequentially comprises the following processes: a DR / BDR (backup designated router) election process prior to a network fault: determining DR and BDR in a network, wherein the DR has a function of distributing or receiving multicast flow; and a BDR action process including a fault detection process: continuously detecting the DR state by the BDR, immediately switching the BDR into a new DR once a DR fault is found, and then performing the BDR election process again to reelect a new BDR. The invention can accelerate the multicast routing convergence rate in case of a DR fault, thereby realizing the quick recovery of multicast flow.

The invention discloses a multicast message transmission method in bidirectional protocol-independent multicast PIM (Personal Information Management) of communication equipment. The method comprises the following steps of: establishing a multicast transmission list by route equipment according to a route protocol; when receiving a multicast message, revising virtual local area network (VLAN) information or virtual private network (VPN) information of a message when the route equipment judges that an interface reached by the multicast message is the interface needing to be reached by the multicast message according to an access control list (ACL) sent by each interface, so as to match the information with the established multicast transmission list; and transmitting the multicast message with the revised information at a corresponding output interface of the multicast transmission list matched with the multicast message. The invention further discloses the communication equipment; with the adoption of the multicast message transmission method and the communication equipment of the invention, the multicast message transmission in the bidirectional PIM can be realized, the multicast transmission list does not need to be established by the communication equipment according to the quantity of VLAN openings of an input interface, so that hardware transmission resources are saved.

A multicasting method of cross-VLAN under extraneous multicast mode in assigned source multicast protocol includes adding multicast VLAN flag for request information by the second layer switch according to multicast source information in multicast data request message and sending said information to the third layer switch, adding relevant multicast VLAN flag for said message by the third layer switch according to received information in said message and sending said message to the second layer switch then sending said message to relevant user by the second layer switch according to multicast VLAN flag carried in said message. The system for realizing said method is also disclosed.

The invention provides a method and device for dynamically deploying rendezvous points in two-way protocol independent multicast. The method and device are applied to SDN controllers. The method includes the steps that firstly, local network load metric values of all network equipment are collected at the interval of first preset time; secondly, the local network load metric values of all the network equipment are gathered to generate a metric value of the whole network load; thirdly, when the starting condition for deploying the rendezvous points again is met, new candidate rendezvous points are determined, and after all the new determined candidate rendezvous points take effects, the metric value of the whole network load is obtained in a pre-analog computation mode; fourthly, according to the whole network load metric value which is obtained in the pre-analog computation mode and corresponds to the situation after all the new candidate rendezvous points take effects and the whole network load metric value corresponding to the current rendezvous points, optimum rendezvous points at present are determined, and the step for deploying the rendezvous points again is carried out. The method and device can dynamically deploy the rendezvous points according to the network load condition and the distribution changing condition of multicast services, multicast sources and multicast receivers.

The invention discloses a multicast service realizing method and equipment thereof. According to the multicast service realizing method provided by the invention, if a DR (Data Recorder) of an assigned router on a receiving side of a given multicast group only has a receiver of a specific multicast service, a PIM (Protocol Independent Multicast) adding message with a specific service mark and channel configuration information is sent to the upstream after the DR receives a message reported by a member of an IGMP (Internet Group Management Protocol); an intermediate router can only transmit the PIM adding message without establishing a corresponding multicast list item; after the PIM adding message is sent to a DR on a multicast source side, a channel is established through dynamic negotiation of the DR on the multicast source side and the DR on the receiving side; and an outlet interface of the channel is additionally arranged on the DR on the multicast source side. Therefore, multicast data to given multicast group receiving equipment is directly sent to the DR on the receiving side through the channel, and sent to receiving equipment after being unpackaged, so that the occupied rate of list item sources on a multicast transmission link is reduced.

A method, a system, and an apparatus for extranet networking of a multicast Virtual Private Network (VPN) are disclosed in the present invention. The method includes: establishing a multicast tunnel to a source VPN multicast instance and a multicast tunnel interface (MTI) connected to the multicast tunnel according to an added Share-Group address of a source VPN; sending an encapsulated Protocol Independent Multicast (PIM) protocol message to the MTI, forwarding the encapsulated PIM protocol message in a public network, and making the source VPN multicast instance generate a public network multicast data message of a Share-Group of the source VPN according to the encapsulated PIM protocol message; and decapsulating the received public network multicast data message of the Share-Group of the source VPN, and obtaining multicast data from the source VPN multicast instance. The present invention reduces the resource occupation of a router system, and alleviates the network load.

The invention discloses a unified electoral method of a PIM-SM (Protocol Independent Multicast-Sparse Mode) designated router and an IGMP (Internet Group Management Protocol) querier. According to the unified electoral method, roles of a main router in a VRRP (Virtual Router Redundancy Protocol) in the same network are introduced as reference basis in the process of electing the designated router in a PIM-SM and the querier in an IGMP, namely, the states of the designated router in the PIM-SM and the querier in the IGMP are the same as the state of the main router in the VRRP respectively, and when the state of the main router in the VRRP changes, the designated router in the PIM-SM and the querier in the IGMP are subjected to state switching synchronously. Therefore, the problem that multicast traffic cannot be correctly forwarded in the multicast because of inconformity of the designated router in the PIM-SM and the querier in the IGMP in the same network is solved, and meanwhile, the electron and switching speeds of the designated router in the PIM-SM and the querier in the IGMP are also improved.

The invention provides a method and a device for realizing a multicast on-demand service in an Internet protocol (IP) network. A designated router (DR) does not transmit a protocol independent multicast (PIM) Hello message and a multicast discovery protocol query message to a multicast source side layer 2 switch directly connected with the DR. The method comprises that: after receiving a PIM addition message from a downstream router, the DR determines a multicast stream input interface corresponding to multicast stream information carried by the PIM addition message, and adds an interface receiving the PIM addition message into an output interface list of a multicast table entry corresponding to the multicast stream information; and the DR transmits the multicast discovery protocol addition message to the layer 2 switch by the determined multicast stream input interface, wherein the multicast discovery protocol addition message carries the information of the multicast table entry. By the method and the device, a multicast on-demand function can be realized in the IP network, and a line bandwidth between the multicast source side layer 2 switch directly connected with the DR and the DR can be saved.

The invention provides a method and a device for pruning a forwarding path of multicast data and network equipment. The method comprises the steps of: acquiring a protocol-independent multicast neighbor list of all routers whose sharing network segments belong to the same multicast group, wherein the protocol-independent multicast neighbor list comprises protocol-independent multicast neighbor relationships of all the routers and forwarding identifications of the multicast data of all the routers, the forwarding identifications of the multicast data are used for determining whether forwarding the multicast data of the multicast group or not; and determining the number of downstream neighbor routers of any router according to the protocol-independent multicast neighbor relationships and pruning the forwarding path of the multicast data according to the number of the downstream neighbor routers of any router and the forwarding identifications of the multicast data of each downstream neighbor router of any router. The invention shortens the pruning delay of the forwarding path of the multicast data in the sharing network segments and saves network bandwidth resources and the multicast router resources.

The invention discloses a multicast data transmission method and multicast data transmission equipment. The method comprises that: network equipment determines the DF interfaces of the network equipment, and sets corresponding (*.G.V) table entries of the DF interfaces; and when receiving multicast data, and the network equipment forwards the multicast data through an outlet interface if a matched (*.G.V) table entry is found according to the inlet interface of the multicast data or discard the multicast data. In the invention, bidirectional protocol independent multicast (PIM) forwarding canbe realized, and the problem of loop of a multicast data stream is solved.

The invention discloses a method for realizing multisource multicast traffic balance based on an ant colony algorithm. In the method, a network topology is taken as an input and a routing table carrying candidate routes is output for a multicast scheduling module to use. The selection of the candidate routes is used for deflecting groups of contention into a plurality of circuitous paths so as to realize duplication and retransmission of multicast data streams; and network nodes in support of protocol independent multicast single-source multicast (PIM-SSM) operate the multicast scheduling technology based on the candidate routes provided by a candidate route module, multicast source data with high priority is sent based on an original multicast tree, and multicast group data with low priority of other bottleneck resources of contention is sent on corresponding candidate routes. In the invention, the time delay for data packet transfer is reduced, and the packet loss rate is reduced while the overall network load balance is considered, thus the aim of improving the network resource utilization factor and the network balance is achieved, and the overlarge time delay and packet loss rate which are caused by queuing are lowered.

The invention discloses a method for realizing PIM (Protocol Independent Multicast) in a VRRP (Virtual Router Redundancy Protocol) network environment. A virtual IP (Internet Protocol) address is carried when a PIM Hello message is transmitted to an interface for enabling the VRRP; when the PIM Hello message is received, the virtual IP address of the VRRP is used for establishing a PIM neighbor, so that unicast and multicast services can be simultaneously used as a host and a backup in the VRRP network environment. Meanwhile, the virtual IP address of the VRRP is completely compatible with a current RFC (Request for Comments) protocol, and so that the problem that the VRRP and the multicast cannot be deployed simultaneously at present is solved. The invention also discloses a device for realizing the PIM multicast in the VRRP network environment. The device comprises a transmitting module and a receiving module, wherein the transmitting module is used for transmitting the PIM Hello message carrying the virtual IP address; and the receiving module is used for receiving the PIM Hello message and selecting and transmitting a router of the PIM Hello message to establish the PIM neighbor by using a real address or the virtual IP address. The method and the device disclosed by the invention have the characteristics that the protocol is simple and the deployment is flexible; common deployment of the VRRP and the multicast can be realized; and the host and backup of the unicast and the multicast can be allowed at the same time.

The embodiment of the invention discloses a method and equipment for multicast forwarding. According to the technical scheme, the method comprises the following steps of: enabling protocol independent multicast (PIM)-Snooping on a switch in data source networking, establishing a PIM-Snooping routing table entry which is not added with a downstream port, adding / pruning message according to PIM sent by downstream adjacent routing equipment, and adding or deleting the downstream port for the PIM-Snooping routing table entry to control whether to forward multicast data stream to the downstream or not, so that the multicast data stream is transmitted to the downstream adjacent routing equipment only when a downstream user has a receiving demand. If downstream users do not need to receive the multicast data stream, the multicast data stream is only transmitted to access switching equipment and is not continuously transmitted to the downstream adjacent routing equipment, so that the aims of saving network bandwidth and preventing the multicast traffic from flooding are fulfilled.

A failure detection mechanism provides enhancements to PIM-SM based fast re-route techniques. A network node upon detecting a loss of connection determines whether it can re-route multicast data traffic. If the network node does not have a failure-free secondary path, it can originate a notification packet and send it to the downstream parts of a multicast tree. The notification packet can trigger one or more downstream nodes to switch-over to redundant secondary paths to re-route the multicast data traffic.

The invention discloses a method and equipment for transmitting multicast data. The method comprises the following steps that: second equipment receives the registration message of a designated router of a multicast source in a protocol independent multicast-sparse mode (PIM SM) domain, and acquires the address information of the multicast source and the address information of a first multicast group corresponding to the multicast source from the registration message; the second equipment transmits a (S, G) adding message which carries the address information of the multicast source and the address information of the first multicast group through first equipment to the designated router; the second equipment receives the multicast data corresponding to the first multicast group, which comes from the multicast source, from the first equipment; and the second equipment transmits the multicast data to a rendezvous point in a bidirectional protocol independent multicast (BIDIR PIM) domain; or, the second equipment transmits the multicast data to the rendezvous point in the BIDIR PIM domain and a receiver in the BIDIR PIM domain. By using the method and the equipment, a BIDIR PIM protocol can be widely applied.

A method and apparatus is disclosed by which IGMP Host messaging is translated to PIM messaging for the purposes of efficiently and accurately maintaining group membership data in a multicast network.

The invention discloses a method for obtaining a multicast topology message in an IP network, which comprises the following steps: selecting a network element of a multicast path as a current network element; obtaining an inlet interface of a multicast router of the current network element and all protocol independent multicast PIM neighboring network elements; searching a network element of which an outlet interface of the next skip of the multicast router is consistent with the inlet interface of the multicast router of the current network element in the PIM neighboring network elements and using the network element as a last-skip network element of the current network element; repeating the steps and searching the last-skip network elements of all the network elements of the multicast path; and connecting all the network elements and the last-skip network elements of the multicast path in series to form a multicast topology. The method can actively obtain the multicast topology message in time and provide convenience for network supervision.

The invention provides a multicast method with specific source, relates to one or more service multicast sources, supports the core network of a source specific multicast service, is compatible with access devices with the two service models of source specific multicast and source independent multicast, and at least relates to a source independent user who joins in the source independent multicast model; the method comprises that: the core network bears at least one multicast group by a source specific multicast method and notifies all the channel information to the access devices; aiming at the source independent user, the access devices uniquely map each channel to one element in a pseudo program set, and all the elements in the pseudo program set are packaged as pseudo program information to be notified to the source independent user; the source independent user clicks the programs in the pseudo program information, and then group report message is sent to the access devices; the access devices reversely map each group entry of the report message into a channel entry, and channel entry message is sent to the core network. The multicast method has the advantages that user control capability is enhanced and the complex degree of source discovery process is effectively reduced.

A wireless bridge includes a first universal asynchronous receiver / transmitter (UART) for coupling to a serial bus that receives data packets. A protocol independent module has a timer set to a desired time to detect a start and / or an end of a data packet received from the serial bus. A wireless transceiver is coupled to the universal asynchronous receiver / transmitter for sending and receiving data packets.

The invention discloses a multicast data transmission method, which comprises that: a bidirectional protocol independent multicast (BIDIR PIM) Relay receives multicast information from a protocol independent multicast sparse mode (PIM SM) domain; the BIDIR PIM Relay sends the multicast information to equipment connected with the BIDIR PIM Relay in a BIDIR PIM domain according to pre-established neighbourship, wherein the neighbourship is the neighbourship between the BIDIR PIM Relay and the equipment in the BIDIR PIM domain; and the equipment in the BIDIR PIM domain sends the multicast information to an RP in the BIDIR PIM domain, and the RP in the BIDIR PIM domain completes the multicast data transmission process according to the multicast information. In the method, the flexible layout of the BIDIR PIM and the PIM SM is realized, and a BIDIR PIM protocol is widely applied.

The invention discloses a designated router (DR) election method and a router. The method comprises that: each router in a protocol independent multicast (PIM) network transmits a Hello message carrying a running time option, wherein the running time option comprises the running time of the router and PIM network initial state duration expected by the router; and each router receives the Hello message from each router in the PIM network, selects the routers taking part in DR election from all the routers of the PIM network according to the running time option carried by the Hello message, and elects a DR from the routers taking part in the election, wherein the running of each router taking part in the DR election is started at a moment not later than the moment at which the PIM gets stable.