63 results about "Dual-homed" patented technology

A protection mechanism capable of providing both local and end-to-end connection protection for dual homed access / aggregation devices or customer-edge devices in a network. The protection mechanism provides end-to-end and fast local protection for off the shelf access devices that do not have any built in per-connection protection capabilities. The access device is connected via two separate physical uplinks to two edge switches of the network. For each connection to be protected, a main path is provisioned from one edge switch and an alternative path is provisioned from the other edge switch. The edge switches are adapted to comprise means for switching traffic from the main path to the alternative path in the event a failure along the main path is detected. Failures both in the stack portion, the core portion and in the access device uplinks are protected against.

A passive optical network having a plurality of optical splitters / combiners each comprising first and second through ports and at least one drop port. The through ports of the plurality of splitters / combiners are concatenated to form a linear arrangement having two end through ports. Optical signals may be transmitted between the end through ports by means of the linear arrangement; and signals may be transmitted between at least one of the end through ports and one of the drop ports by means of the linear arrangement. The splitter / combiners can be inserted to form drop points in a ring or dual-homed passive optical network to provide flexibility in provision of protection and network reconfiguration.

A system, method and computer-readable medium for concurrent support of Voice Call Continuity (VCC) capabilities in both the enterprise space and the carrier space are provided. The enterprise VCC functionality is used when the user is located in the enterprise domain which does not impact the carrier's network while the carrier VCC capability is used when the user is located in the carrier domain to support seamless handover between the wireless networks that the carrier may offer. The carrier VCC anchoring point and the enterprise VCC anchoring point may communicate with each other to confirm and inform the other anchoring point that a call handover is occurring or will occur.

The present invention is a system and method to improve the reliability and performance of existing enterprise IP networks which have dual-homed (or multi-homed) network architectures. In one aspect of the invention packets related to a selected category of transmission (e.g., VoIP) are duplicated at an edge router and sent over both (multiple) service providers. After traversing the service provider networks, only the first-to-arrive packets are kept and the later-arriving copies are discarded. In so doing, the result is better protection against node failures, link failures, and packet errors, and also better QoS performance under normal (fault-free) operation.

A technique for operating a network involves controlling the black-holing of traffic by selectively redirecting unicast traffic destined for a dual-homed customer equipment (CE) device from a first provider backbone bridge (PBB) provider edge (PE) device to a second PBB PE device in response to a service failure. Unicast traffic is selectively redirected from the first PBB PE device to the second PBB PE device for a time interval that is long enough to enable the customer source MAC address (CMAC)-to-backbone MAC address (BMAC) association of the second PBB PE device to be learned by other PBB PE devices.

The invention discloses a CE dual-homed link protection method in MPLS L3VPN and a system thereof. The method comprises the following steps: ARP items of a target CE are configured on a main PE and a standby PE; the main PE generates an interface FRR relation table of a direct connecting network segment route which reaches the main PE and the target CE; simultaneously, the main PE and the standby PE generate a host route forwarding table according to static ARP items, and the main PE generates a corresponding subnet route forwarding table according to the interface FRR relation table; after detecting that a link state between the main PE and the target CE changes, the main PE switches the interface FRR relation table into a standby path or switches the interface FRR relation table back into a main path, and updates related information in a subnet routing table and a host routing table; after receiving a data flow, the main PE obtains present effective out interface information from the present host route forwarding table or subnet route forwarding table, and forwards the data flow to reach the target CE. By employing the method and the system of the invention, the rapid switching of the data flow can be effectively realized.

An Ethernet network, an Ethernet method, and an Ethernet node provide active-active dual-homed interworking between two Ethernet networks. The network, method, and node can include two nodes interconnected each to a Shortest Path Bridging (SPB) network and an Ethernet Virtual Private Network (E-VPN). The two nodes can utilize a same Ethernet Segment Identifier (ESI) for the E-VPN network to cause the dual-homed links to appear as a single link from an E-VPN perspective and a dummy node to advertise an extra node in the SPB network enabling two paths therein.

A system for controlling packet forwarding through a dual-homed connection between first and second network domains, the dual-homed connection including two peer nodes connected to the first and second network domains. A sub-ring network is instantiated in the first network domain, and includes at least two nodes connected in a linear topology between a pair of end-nodes. Each end-node corresponds with a respective one of the peer nodes. A virtual link through the second network domain for conveys traffic of the sub-ring network between the peer nodes, and closes the sub-ring network to define a ring topology. Each of the nodes of the sub-ring network is controlled to forward packets of the sub-ring network in accordance with a ring network routing scheme.

The invention discloses a switching method and a switching system. The method comprises the step of: sending a message to a far end PE through a dual-homed PED when dual-homed client equipment (CE) or dual-homed provider equipment confirms a primary link failure, wherein the message contains the address information of the dual-homed CE. The method also comprises the steps of switching a flow from a primary PW to a spare PW through the far end PE so as to be transmitted, and switching the flow from the primary link to a spare link through the dual-homed client equipment so as to be transmitted. The invention also provides a switching system. According to the technical scheme of the invention, when the link of the dual-homed CE is in failure, the switching for the link of the dual-homed CE and PW is rapidly performed without influence on the flow of the single-homed CE.

A method and a system for forwarding Ethernet packets by an Ethernet bridge (EB1) in an Ethernet Layer 2 VPN network; said method being characterized in that it comprises the steps of: by the L2VPN module (VxI) of the ingress LER (ML1), notifying the first Ethernet bridge (EB1) about the primary internal port (4) associated to the receiving MAC-address (MACb) and to the given VLAN identification; by the L2VPN module (VxI) of the ingress LER (ML1), notifying the first Ethernet bridge (EB1) about the backup internal port (5) directly associated to the backup MPLS port (5m) which is acting as a backup MPLS port in an event of failure of the primary MPLS port (4m); by the first Ethernet bridge (EB1), adding to the internal filtering database the backup internal port (5) to be used in the event of failure of the primary MPLS port (4m) so as to create a combined filtering database; by the ingress MPLS LER (ML1), notifying the first Ethernet bridge (EB1) about MPLS ports status; by the at least one transmitting CE device (CEa), transmitting Ethernet packets of a given VLAN identification to the receiving MAC-address (MACb) of the at least one receiving CE device (CEb); by the first Ethernet bridge (EB1), before forwarding the transmitted Ethernet packets, checking, when, in the combined filtering database, the receiving MAC-address (MACb) of the given VLAN is associated to a backup ingress internal port (5), if the corresponding primary MPLS port (4m) directly associated to said primary ingress internal port (4) is failed or not; if the corresponding primary MPLS port (4m) is failed, forwarding Ethernet packets to the backup egress port (5) of the receiving MAC-address (MACb) having the given VLAN identification.

A procedure, and an apparatus, system and computer program that operate in accordance with the procedure, for operating a dual homed communications network. In the procedure, a backup aggregation n ode is configured in accordance with a configuration of a primary multi-service router. A failure is detected in a first communication path that includes a primary multi-service router. In response to the detection, a second, backup communication path is activated that includes a backup multi-service router. In response to the activation, a router is negotiated with so that traffic forwarded by the router is provided to the second, backup communication path instead of the first communication path.

Traffic demands are routed between network elements so as to provide improved protection against network failures. A given traffic demand is routed from a first network element to a second network element, where the second network element is preferably either one of a set of dual-homed elements, or coupled to a dual-homed element, and may also be an element of a ring-type transport or a mesh-type transport. The second network element processes the traffic demand such that a copy of a signal associated with the demand is (i) retained at the second network element, while the signal is routed to at least one additional network element, or (ii) routed to at least one additional network element, while the signal is routed to at least one network element other than the additional network element. For example, in a multidrop connection implemented in accordance with the invention, a copy of the signal is “dropped” at the second network element and one or more additional network elements. In a multicast connection implemented in accordance with the invention, one or more copies of the signal are multicast from the second network element to multiple additional network elements.

Interworking an Ethernet Ring network with an Ethernet network with traffic engineered trunks (PBT network) enables traffic engineered trunks to be dual homed to the Ethernet ring network to enable for protection switching between active and backup trunk paths in the PBT network. In one embodiment, the active path will terminate at a first bridge node on the Ethernet ring network and the backup path will terminate at a second bridge node on the Ethernet ring network. Trunk state information is exchanged between the bridge nodes to enable the bridge nodes to determine which of the active and backup paths should be used to forward data on the trunk. Upon a change in trunk state, a flush message is transmitted on the Ethernet ring network to enable the nodes on the Ethernet ring network to relearn the path to the new responsible bridge node.

A dual homing technique for ensuring loop free transmission of traffic between telecommunication networks such as VPLS by utilizing a loop protocol in the dual homed connection. The technique also provides selective handling of VPLS data streams protected and non-protected by the dual homing loop protocol.

When a communication path between a user site and a dual-homed data center is made redundant, a communication between the user site and a server within a data center can be continued. An edge node DCE-1 of a data center 40-1 and edge nodes TPE-1, TPE-2 of a transport network are connected to each other by a link TPE-1-1 and a link TPE-2-1, respectively. The edge nodes TPE-3 and TPE-1, TPE-2 that hold a node AE51 of a user site 50 are set with an LSP 110 of an active system, and an LSP 120 of a backup system, respectively. One of the links is active, and the other link is backup, and the LSP of the TPE node having the active link in the LSP 100 and the LSP 120 is made active. The respective links are prioritized, and the links are switched to an active state in order from the links higher in the order of priority when a link failure or an LSP failure occurs.

The invention discloses a method, equipment and system for processing a message. The method comprises the following steps: first PE equipment receives a first VXLAN message through a first P2P VXLAN tunnel between the first PE equipment and third PE equipment; CE equipment is dual-homed to the first PE equipment and the second PE equipment through a first Ethernet link and a second Ethernet link;when the first PE equipment determines that the first Ethernet link is in fault, the first PE equipment forwards the first VXLAN message to the second PE equipment through a third P2P VXLN tunnel to the second PE equipment from the first PE equipment, wherein the first Ethernet link connected with the first PE equipment and the link composed of the third P2P VXLAN tunnel and the second Ethernet link are in a active / standby relation. Therefore, the transient traffic detouring is realized, and the packet loss produced in the transmission process of the data traffic can be reduced.

The invention provides an OCP riser card and computer equipment. The riser card comprises an OCP connector, a CPLD (Complex Programmable Logic Device), a selector and a mainboard connector, wherein the CPLD is a complex programmable logic device; the OCP connector is used for connecting an OCP network card; the CPLD is used for bandwidth allocation, in-place control and power-on and power-off control of the OCP network card; the selector is used for gating the single-host host or the double-host based on the working mode configuration information stored in the CPLD; the mainboard connector isused for being connected with a mainboard device. Information interaction of each module is carried out; the functions of supporting a single host and a dual host are realized; the switching of the configuration of the single host and the dual host can be realized on the premise of not opening a case to replace a cable according to requirements, so that the design complexity of the mainboard interface is simplified, the application is more flexible and diversified, and the multiplexing of other peripherals of the PCIE interface of the mainboard end is facilitated. Meanwhile, a hot plug controlcircuit is designed in two corresponding modes.

In a tool for use by network planners in designing metropolitan IP aggregation networks, several optimization methods are integrated into a tool. A k-means algorithm is used to choose access packet switch locations. A dual-k-means algorithm is used to choose the backbone switch locations. Each access packet switch is dual homed to two backbone packet switches using two diverse paths. The diverse path configuration is found using a maxflow-mincost algorithm on a modified fiber map topology. The link topology connecting the backbone packet switches to each other is designed using a heuristic that creates a skeleton network topology and then adds express links one by one, testing each link to assure reduced overall network cost. The resulting network topology is then improved upon by local search.

A multi-chassis link aggregation (MC-LAG) system includes one or more dual homed nodes coupled to a pair of switches (MC pair) and one or more single homed nodes coupled to a single one of the MC pair of switches. The MC pair of switches advertises a virtual IP address for the dual homed nodes such that traffic may be received at either switch in the MC pair for the dual homed nodes. For a single homed node, a dedicated IP address is advertised associated with a switch in the MC pair locally connected to the single homed node. Traffic destined to the single homed node is thus transmitted to the switch in the MC pair locally connected to the single homed node.

In order to achieve path diversity for dual-homed User-Network Interface clients connected to a Generalized Multiprotocol Label Switching control plane enabled transport network that is operated in an overlay mode, the overlay extension service model is enhanced by adding shared constraint information for path diversity in the optical transport network. In particular, within the provider network, shared constraint information of a first traffic path is determined and a data element indicative of the shared constraint information is returned by a first provider edge node to a customer edge device via a User-Network Interface. When the customer edge device requests a second traffic path through the provider network to be established from a second provider edge node and to be disjoint from said first traffic path, the customer edge device forwards the data element to the second provider edge node to enable path calculation of the second traffic path using the shared constraint information as exclusion list.

A ring control protocol is used to establish a separate control plane for a plurality of physically dual homed devices to enable collections of dual homed devices to be represented by a single pair of addresses into the attached routed Ethernet network. The gateway devices analyze the passing ring control packets to create direct mappings for data packets to the routed Ethernet network. Thus, although the dual homed devices are treated as a ring from a control perspective, the data path is implemented to be direct so that data packets continue to flow directly from the dual homed devices to each of the attached gateway devices. In one embodiment, each of the gateway devices implements a virtual switch and advertises the MAC address of the virtual switch into the routed Ethernet network rather than the MAC addresses of each of the attached Ethernet Switch Units.

A method and system for designing a bi-connected ring-based network is provided, which designs from scratch or converts an existing network to a dual-homed ring-based network. The network covers the locations capable of being bi-connected with one or more cycles / rings. The traffic demand is then routed via the cycles, in such a way so as to minimize the amount of network traffic management equipment required.

A wireless sensor mesh network for environmental monitoring utilizing a dual-homed router which may be completely controlled through a mobile device. A wireless system network that is modular and scalable allowing a user to easily integrate any custom combination that fits their needs. The first and most basic Sensors may be for temperature, humidity, CO2 levels in the air, soil moisture, and pH.

The invention provides a method and a device for realizing a virtual private network fast reroute by a network processor, comprising the following steps of establishing a link and deploying the virtual private network fast reroute (VPNFRR) and an outer layer fast reroute (FRR) as a less preferred link in the link, and setting a protection level of the VPNFRR link higher than that of the outer layer FRR link; when judging a failure in the preferred link is in failure, and judging the position of the occurred failure in the preferred link is a PE nodal point or the link locating in an area of customer edge switching equipment (CE) or dual-homed provider edge switching equipment (PE) applying the VPNFRR without protection from the deployed outer layer FRR, obtaining information of the VPNFRR and packaging and forwarding a data packet through the VPNFRR link. The invention solves the problem of property conflicting of the VPNFRR and the outer layer FRR existing in the network.

The invention provides a method for realizing a non-return mode in Ethernet dual homed connection protection. When one fault link of a dual homed node recovers and the other one is free of fault, switching is not performed and the fault recovering link is maintained in a block state. In the dual-homed connection, the dual-homed connection protection fails to perform switching of a communication path if an available path exists in the network communication when a path recovers. The protection method of the non-return mode can prevent communication interruption and large amount of broadcast frames generated when the Ethernet dual-homed connection protection recovers switching.

The invention discloses a method for activating VLAN (Virtual Local Area Network) negotiation, which comprises the following steps of judging whether a second link between an ED (Edge Device) and the other ED which forms a dual-homed ED together with the ED can be reached, and sending an EVI (Ethernet Virtualization Internet) IS-IS (Intermediate System - Intermediate System) Hello message used for activating the VLAN negotiation to the other ED through an EVI link between the ED and the other ED when the second link cannot be reached. The invention further discloses the ED. By applying the technical scheme disclosed by the invention, the problem of MAC (Media Access Control) table shocks on the far end of the EVI of a remote site can be avoided.

A system for controlling packet forwarding through a dual-homed connection between first and second network domains, the dual-homed connection including two peer nodes connected to the first and second network domains. A sub-ring network is instantiated in the first network domain, and includes at least two nodes connected in a linear topology between a pair of end-nodes. Each end-node corresponds with a respective one of the peer nodes. A virtual link through the second network domain for conveys traffic of the sub-ring network between the peer nodes, and closes the sub-ring network to define a ring topology. Each of the nodes of the sub-ring network is controlled to forward packets of the sub-ring network in accordance with a ring network routing scheme.