553 results about "Pseudo-wire" patented technology

A method, apparatus and network for transporting layer-2 frames, such as Ethernet MAC, ATM AAL5, and Frame Relay, over MPLS, SONET/SDH, or OTN optical transport networks as well as electrical transport networks is disclosed. The method establishes "pseudo-wires" between, for example, routers, Layer-2 packet switches, or SONET/SDH switches. Inter-related ingress and egress resource tables may be used by provider edge nodes to negotiate consistently managed data tunnels across a provider network on behalf of data flowing from/to a diverse base of customer edge nodes. Detailed network resource information particular to each of the data flows is exchanged between provider edge nodes during the creation of pseudo-wires. Admission control algorithms are applied at the ingress and egress points in order to manage the data flows into a provider network and exiting from a provider network to customer equipment. By applying pseudo-wire shuffling and preemption techniques, the providers can make better use of their network resources by admitting more pseudo-wires.

A method, apparatus and network for transporting layer-2 frames, such as Ethernet MAC, ATM AAL5, and Frame Relay, over SONET, SDH, or OTN transport networks is disclosed. The method establishes "pseudo-wires" between, for example, SONET switches and directly on top of the SONET layer. The method may implement MPLS signaling protocols on traditional SONET switches for the purpose of aggregating layer-2 frames from the transport network edges, while the transport network itself is independent from IP and MPLS routing. This approach provides a number of advantages to the network carriers in terms of operation and equipment expense reduction. To enable the transport network to be independent from IP and MPLS, and avoid subsequent IP control message processing inside the networks, an edge-to-edge "tunneling" mechanism is designed to transmit control messages as a part of the SONET (or SDH or OTN) frame payload.

A network connection device connecting a pseudo wire of a layer 2 and a pseudo wire formed of a layer 3, comprising: a switching unit operating as an edge switch of a layer 2 network forming a first pseudo wire; a routing unit operating as an edge router of a layer 3 network forming a second pseudo wire; and a conversion unit which makes conversion between a frame of the layer 2 network and a packet of the layer 3 network.

The invention discloses a method for building an MAC (Media Access Control) address table and a provider edge device. In the method, a PE (Provider Edge Device) receives a first service message by a PW (Pseudo Wire) connected with the PE; when the first received service message is confirmed to be a specific-type message, the building of the address table entry of the source MAC address of the first service message is cancelled, wherein the specific-type message is an unknown unicast message, a multicast message or the broadcasting message of a non-free ARP (Address Resolution Protocol) message. According to the scheme provided by the embodiment of the invention, the amount of the address table entries built by the PE is reduced so as to reduce the volume of the MAC address table.

A provider edge device, associated with a virtual private local area network service (VPLS) system, includes a memory to store instructions to implement a pseudowire mechanism to receive a first data frame from a source customer edge (CE) device associated with the VPLS system, incorporate the first data frame into a first VPLS packet, determine whether the source CE device is a single-homed CE device or a multi-homed CE device, and incorporate, into the first VPLS packet, a first pseudowire label, if the source CE device is a single-homed CE device, and incorporate, into the first VPLS packet, a second pseudowire label, different from the first pseudowire label, if the source CE device is a multi-homed CE device; and a processor to execute the instructions.

A method for data communication across a layer 2 bridged network having two or more edge nodes configured for receiving and transmitting multiprotocol data packets. The method includes creating a pseudowire circuit across the bridged network, receiving data packets at one of the edge nodes, encapsulating data packets into pseudowire frames, encapsulating the pseudowire frames inside MAC frames, and transmitting the encapsulated frames over the carrier bridged network.

An apparatus for emulating a layer-2 service over at least one network is disclosed. The apparatus includes a signal transmission path. Two provider edge devices are located at opposite ends of the signal transmission path. A provider device is located along the signal transmission path, and this provider device divides the signal transmission path into segments. One of the provider edge devices includes code for adding a demultiplexing header onto data units prior to the data units being transmitted along the signal transmission path.

The invention is directed to providing pseudowire tunnel redundancy for VPLS and VLL services in the form of automatic protection switching of the service from a primary pseudowire tunnel to a backup pseudowire tunnel upon detection of a failure affecting the primary pseudowire tunnel. Embodiments of the invention monitor event notifications reported by a network management entity for an indication of a failure affecting the primary pseudowire tunnel; and responsive to detecting the indication, switch a service carried by the primary pseudowire tunnel to the backup pseudowire tunnel. Such event notifications include those corresponding to any of provider edge routers, interface ports, service access points, spokes, and tunnel endpoints that are related to operation of the primary pseudowire tunnel

Apparatus and method for providing a termination point for service emulation instances in an access network is provided. In an embodiment, the service emulation instances are implemented utilizing, for example, pseudowires. Communications to and from the access network are aggregated and transmitted via one or more pseudowires to a service emulation instance terminator. The service emulation instance terminator converts the traffic to its native form and, if necessary, converts the traffic to a different type of format or service. The service emulation instance terminator then frames the traffic for the appropriate type of service and transmits the traffic to the service edge. Traffic received from the service is removed prepended with a pseudowire label and aggregated with other traffic. The aggregated traffic is transmitted to the customer via the access network. If necessary, an interworking function may convert the traffic from one type of service to another type of service. Further, functionalities of equipment such as frame relay switching or Asynchronous Transfer Mode (ATM) switching may be realized in the service emulation instance terminator.

A method for testing connectivity of a multi-segment pseudo-wire in a packet switched network, the method comprising: (a) sending an echo request message from a first provider edge device to a second provider edge device for a first segment of the multi-segment pseudo-wire between the first provider edge device and the second provider edge device; and, (b) receiving an echo reply message from the second provider edge device in response to the echo request message, the echo reply message: confirming connectivity of the first segment; indicating whether there is a second segment in the multi-segment pseudo-wire between the second provider edge device and a third provider edge device; and, if there is a second segment, including information pertaining to the second segment.

The invention discloses a method for achieving point-to-multipoint pseudo-wires, which comprises the following steps: establishing a border gateway protocol (BGP) protocol with downstream node equipment through negotiation according to the collected network topology information; and sending a BGP message to the downstream node equipment, wherein the BGP message carries point-to-multipoint pseudo-wire labels specifically distributed to a virtual private multicast service (VPMS) embodiment to establish the point-to-multipoint pseudo-wires. The embodiment of the invention also provides corresponding equipment and a system. The technical proposal of the invention does not need static configuration, but needs dynamic establishment, thus the efficiency for establishing the point-to-multipoint pseudo-wires is improved; besides, relative to the static configuration, the accuracy rate of configuration is improved.

An International Standards Organization (“OSI”) Layer-2 (“Ethernet”) Pseudo-wire (“OSI Layer-1 type service”) appliance, method, system and hub service is disclosed. The method and system facilitate the rapid deployment of Layer-2 Pseudo-wires over unknown and untrusted Internet Protocol (“IP”) networks. The method and system facilitate the fluid edge of corporate networks and any situation where the Layer-3 network addresses cannot be changed.

A pseudo wire label reflector, based on a existing label distribution router, further includes: a mode management unit, for determining the mode for switching and transferring a pseudo wire label message; a first session management unit, for saving the support information that LDP signaling session connection supports the pseudo wire label reflecting capacity; a first pseudo wire label receiving unit, for receiving a pseudo wire label message; a first pseudo wire management unit, for saving the switched pseudo wire state and deciding whether to modify the pseudo wire label message according to the switch and transfer mode determined by the mode management unit; a first pseudo wire label sending unit, for sending the pseudo wire label message. The invention also provides an edge apparatus, a L2 VPN and a method for providing pseudo wire service in PSN. The present invention makes PE equipments participating pseudo wire service to set up PSN tunnel and LDP signaling session connection with the pseudo wire label reflector by introducing the pseudo wire label reflector and extending the capacity that the current edge apparatus supports the pseudo wire label reflector.

A resource reservation and admission control scheme uses pseudowires to reserve bandwidth over a layer-2 and/or layer-3 network. The pseudowires are associated with ports on different network processing devices. During a resource reservation and admission control session, the physical links used by the pseudowire are selected and reserved to more effectively allocate network bandwidth. The negotiated pseudowire is then used to transport content for a communication session over the network. In one example application, the resource reservation and admission control scheme is used during a Downstream External PHY Interface (DEPI) session for pseudowires established between a Modular Cable Modem Termination System (M-CMTS) Core and an Edge Quadrature Amplitude Modulation Interface (EQAM) device. However, the reservation protocol can be used in any application that needs to reserve bandwidth over an Internet Protocol (IP) network.

The invention discloses a method, equipment and a system for protecting link circuit, which belongs to the technical field of communication. The method is applied in a multi-ownership network which comprises communication equipment and a first PE and a second PE which are connected with the communication equipment, the method specifically comprises when faults exist on a first channel between the communication equipment and the first PE, the first PE transmits received message which is sent to CE to the second PE through a spare pseudo wire which is connected with the first channel and is located between the first PE and the second PE, the message is transmitted to communication equipment through a second channel which is connected with the spare pseudo wire and is located between the communication equipment and the second PE after being received by the PE. The equipment comprises a first processing module and a second processing module. The system at least comprises a first PE, a second PE and communication equipment. The invention achieves the protection of a link circuit, which lowers request to PE equipment, can not cause a great amount of broadcast flow quantity instantly, saves band width, shortens fault restoring time of systems, and improves efficiency and reliability.

The invention provides a method and a device for establishing pseudowire mapping, belonging to the communication field. The method comprises the following steps: a first node transmits a first label mapping message which is provided with a positive tunnel mark and a positive pseudowire label; a second node receives the first label mapping message and establishes the positive pseudowire mapping relation between the positive pseudowire label and a tunnel label corresponding to the positive tunnel mark. The invention also provides the device for establishing the pseudowire mapping, and a node device, which can ensure that pseudowires of two PEs can be mapped in the same bi-directional tunnel, thereby ensuring the consistency of time delay parameters, dithering parameters, and the like in two-way businesses and saving bandwidth in the condition that the pseudowires produce faults.

A method is provided for setting up at least two pseudo-wires able to broadcast a stream of data, wherein a first pseudo-wire is set up between an input router of a packet-switched network and first output router of the packet-switched network, and a second pseudo-wire is set up between the input router and a second output router of the packet-switched network. A first link of the first pseudo-wire is set up between the first output router and an intermediate router of the packet-switched network. A second link of the second pseudo-wire is set up between the second output router and the intermediate router. A third link of both pseudo-wires is set up between the intermediate router and the input router.

The invention discloses a method of studying MAC address. A root network device issues data message to leaf PE, wherein the said data message at least comprises customer data and a label for marking the VPLS of the customer data and entry PE. The said customer data at least has customer source MAC address. The leaf PE obtains the VPLS and entry PE based on the label in the data message. When the leaf PE is not the entry PE, and CE connected with the leaf PE belongs to the said VPLS, the leaf PE obtains a phantom line to the entry PE, and the mapping relation between the said phantom line and customer source MAC address is stored. The invention also provides a system and device for transmitting the VPLS customer data. When the VPLS customer data is transmitted using multicast tree, MAC address studying is performed on the leaf PE, and the customer border device is ensured not to receive two same customer data packages.

The invention discloses a method for realizing multicast protection. The method comprises the following steps: a main link and a backup link are configured for a PW (pseudo wire) between uplink PE (provider edge) and downlink PE; the downlink PE and the uplink PE establish a T-MPLS (transmission-multiprotocol label switching) multicast forwarding table respectively; the uplink PE sends an acquired multicast data message to the downlink PE through the master/slave links simultaneously; the downlink PE forwards the multicast data message received from the main link to corresponding CE (customer edge) according to the T-MPLS multicast forwarding table, and discards the multicast data message received from the backup link; and when the main link fails, the main link is switched to the backup link, and the downlink PE forwards the multicast data message received from the backup link to the CE. The invention also provides a system for realizing multicast protection. Through the technical scheme of the invention, normal transmission of multicast services can be guaranteed when a link in the T-MPLS network fails.