Patents by Inventor Loa Andersson
Loa Andersson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11888734Abstract: A mixed Multiprotocol Label Switching (MPLS) network includes both extension header capable (EH capable) nodes and EH non-capable nodes. A first EH capable node receives advertised capabilities of a downstream node. These advertised capabilities indicate whether the downstream node is EH capable. The first EH capable node receives a packet to be transmitted to the downstream node via the MPLS network, and determines whether the packet includes an extension header (EH). The node inserts an EH label into an MPLS label stack of the packet after determining the advertised capabilities of the downstream node indicate that the downstream node is EH capable, and after determining the packet does not include the EH.Type: GrantFiled: February 8, 2021Date of Patent: January 30, 2024Assignee: Huawei Technologies Co., Ltd.Inventors: James N. Guichard, Haoyu Song, Loa Andersson
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Publication number: 20210203599Abstract: A mixed Multiprotocol Label Switching (MPLS) network includes both extension header capable (EH capable) nodes and EH non-capable nodes. A first EH capable node receives advertised capabilities of a downstream node. These advertised capabilities indicate whether the downstream node is EH capable. The first EH capable node receives a packet to be transmitted to the downstream node via the MPLS network, and determines whether the packet includes an extension header (EH). The node inserts an EH label into an MPLS label stack of the packet after determining the advertised capabilities of the downstream node indicate that the downstream node is EH capable, and after determining the packet does not include the EH.Type: ApplicationFiled: February 8, 2021Publication date: July 1, 2021Applicant: Huawei Technologies Co., Ltd.Inventors: James N. Guichard, Haoyu Song, Loa Andersson
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Patent number: 9059905Abstract: The present invention relates to methods and arrangements in an MPLS-TP network. comprising a plurality of interconnected routers configured for MPLS-TP, wherein at least a first router is defined as an originating Maintenance End Point, MEP, a second router is defined as a targeting MEP and the third router is defined as a Maintenance Intermediate Point, MIP. The basic idea of the present invention is to associate a table with each MIP and MEP, wherein the tables comprises information related to the MEPs of the MPLS-TP network and the information from the tables is inserted in the reply packets and forwarded packets. By using this information, the OAM packets can find the subsequent MIP or MEP and failure localization may be performed.Type: GrantFiled: November 14, 2013Date of Patent: June 16, 2015Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Wei Zhao, Loa Andersson
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Publication number: 20140140217Abstract: The present invention relates to methods and arrangements in an MPLS-TP network. comprising a plurality of interconnected routers configured for MPLS-TP, wherein at least a first router is defined as an originating Maintenance End Point, MEP, a second router is defined as a targeting MEP and the third router is defined as a Maintenance Intermediate Point, MIP. The basic idea of the present invention is to associate a table with each MIP and MEP, wherein the tables comprises information related to the MEPs of the MPLS-TP network and the information from the tables is inserted in the reply packets and forwarded packets. By using this information, the OAM packets can find the subsequent MIP or MEP and failure localization may be performed.Type: ApplicationFiled: November 14, 2013Publication date: May 22, 2014Applicant: Telefonaktiebolaget L M Ericsson (publ)Inventors: Wei ZHAO, Loa Andersson
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Patent number: 8611353Abstract: The present invention relates to methods and arrangements in an MPLS-TP network, comprising a plurality of interconnected routers configured for MPLS-TP, wherein at least a first router is defined as an originating Maintenance End Point, MEP, a second router is defined as a targeting MEP and the third router is defined as a Maintenance Intermediate Point, MIP. The basic idea of the present invention is to associate a table with each MIP and MEP, wherein the tables comprises information related to the MEPs of the MPLS-TP network and the information from the tables is inserted in the reply packets and forwarded packets. By using this information, the OAM packets can find the subsequent MIP or MEP and failure localization may be performed.Type: GrantFiled: May 29, 2009Date of Patent: December 17, 2013Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Wei Zhao, Loa Andersson
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Publication number: 20120063325Abstract: The present invention relates to methods and arrangements in an MPLS-TP network, comprising a plurality of interconnected routers configured for MPLS-TP, wherein at least a first router is defined as an originating Maintenance End Point, MEP, a second router is defined as a targeting MEP and the third router is defined as a Maintenance Intermediate Point, MIP. The basic idea of the present invention is to associate a table with each MIP and MEP, wherein the tables comprises information related to the MEPs of the MPLS-TP network and the information from the tables is inserted in the reply packets and forwarded packets. By using this information, the OAM packets can find the subsequent MIP or MEP and failure localization may be performed.Type: ApplicationFiled: May 29, 2009Publication date: March 15, 2012Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Wei Zhao, Loa Andersson
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Automatic protection switching using link-level redundancy supporting multi-protocol label switching
Patent number: 8134917Abstract: A computer network has a plurality of routers that deliver data packets to the network via a plurality of links. At least one router provides automatic protection switching in the event of a link failure. The at least one router includes a plurality of data interfaces for streams of data packets to enter and exit the at least one router; and a backup controller. The backup controller includes a backup path manager, a link monitor, and a backup packet processor. For at least one link of the routing node, the backup path manager identifies a backup routing path for forwarding affected data packets in the event of a failure of the at least one link. The link monitor monitors the plurality of links to determine when a link fails. When a link which has a backup routing path fails, the backup packet processor attaches backup routing path instructions to affected data packets routed over the failed link, and forwards the affected data packets via the backup routing path.Type: GrantFiled: July 25, 2005Date of Patent: March 13, 2012Assignee: Rockstar Bidco LPInventors: Andre N. Fredette, Loa Andersson, Naganand Doraswamy, Anoop Ghanwani -
Patent number: 7760623Abstract: A computer network processes data packets in the event of a network link failure. The network includes a plurality of routers that deliver data packets to the network via a plurality of links. At least one router includes a protection cycle manager. The protection cycle manager has a protection cycle packet identifier and a protection cycle packet processor. The protection cycle packet identifier identifies, as protection cycle packets, data packets having a specific protection cycle format. The protection cycle packet processor processes protection cycle packets to determine whether the packet destination corresponds to the routing node, and if the packet destination corresponds to the routing node, the protection cycle packet is treated by the routing node as a data packet received from the packet source via the failed link. Otherwise, if the packet destination does not correspond to the routing node, the protection cycle packet is sent to a protection cycle node for the routing node.Type: GrantFiled: December 22, 2008Date of Patent: July 20, 2010Assignee: Nortel Networks LimitedInventors: Loa Andersson, Kent Felske, Guo-Qiang Wang
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Publication number: 20090161537Abstract: A computer network processes data packets in the event of a network link failure. The network includes a plurality of routers that deliver data packets to the network via a plurality of links. At least one router includes a protection cycle manager. The protection cycle manager has a protection cycle packet identifier and a protection cycle packet processor. The protection cycle packet identifier identifies, as protection cycle packets, data packets having a specific protection cycle format. The protection cycle packet processor processes protection cycle packets to determine whether the packet destination corresponds to the routing node, and if the packet destination corresponds to the routing node, the protection cycle packet is treated by the routing node as a data packet received from the packet source via the failed link. Otherwise, if the packet destination does not correspond to the routing node, the protection cycle packet is sent to a protection cycle node for the routing node.Type: ApplicationFiled: December 22, 2008Publication date: June 25, 2009Inventors: Loa Andersson, Kent Felske, Guo-Qiang Wang
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Patent number: 7486615Abstract: A computer network processes data packets in the event of a network link failure. The network includes a plurality of routers that deliver data packets to the network via a plurality of links. At least one router includes a protection cycle manager. The protection cycle manager has a protection cycle packet identifier and a protection cycle packet processor. The protection cycle packet identifier identifies, as protection cycle packets, data packets having a specific protection cycle format. The protection cycle packet processor processes protection cycle packets to determine whether the packet destination corresponds to the routing node, and if the packet destination corresponds to the routing node, the protection cycle packet is treated by the routing node as a data packet received from the packet source via the failed link. Otherwise, if the packet destination does not correspond to the routing node, the protection cycle packet is sent to a protection cycle node for the routing node.Type: GrantFiled: January 27, 2003Date of Patent: February 3, 2009Assignee: Nortel Network LimitedInventors: Loa Andersson, Kent Felske, Guo-Qiang Wang
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Patent number: 7380017Abstract: A communications network comprises a lower transport layer and an upper overlay incorporating a plurality of routers. Adjacencies are defined between respective pairs of routers. Path protection is provided by defining a software model of the overlay of the network and defining in the model a hierarchy of protection levels for the main path. Each protection level is characterised by a respective set of one or more broken adjacencies in the model, the adjacencies to be broken being determined from a knowledge of the underlying topology. A protection level is selected and a protection path avoiding the broken adjacencies associated with that protection level is calculated. If this calculated path is not available in the real network, a lower protection level in the hierarchy is selected and the protection path calculation repeated. The process continues until a suitable protection path is identified.Type: GrantFiled: May 3, 2001Date of Patent: May 27, 2008Assignee: Nortel Networks LimitedInventors: Jon Weil, Alex Morrall, David Odhams, Kenneth Hayward, Loa Andersson
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Patent number: 7023846Abstract: A system, device, and method for establishing and removing a label switched path in a communication network uses a packet-driven mechanism rather than using an explicit signaling protocol to exchange label switching information from an upstream label switching device to a downstream label switching device. In order to establish a label switched path from the upstream label switching device to the downstream label switching device, the upstream label switching device allocates a new label for the label switched path, sets up the label switched path by adding the new label to its forwarding table, and forwards a labeled packet including the new label and an indicator indicating that the packet is labeled. Upon receiving the labeled packet from the upstream label switching device, the downstream label switching device sets up the label switched path by adding the new label to its forwarding table, and forwards the packet based upon network layer addressing information in the packet.Type: GrantFiled: July 18, 2000Date of Patent: April 4, 2006Assignee: Nortel Networks LimitedInventors: Loa Andersson, Tove Madsen, Kenneth Sundell
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Automatic protection switching using link-level redundancy supporting multi-protocol label switching
Patent number: 6987727Abstract: A computer network has a plurality of routers that deliver data packets to the network via a plurality of links. At least one router provides automatic protection switching in the event of a link failure. The at least one router includes a plurality of data interfaces for streams of data packets to enter and exit the at least one router; and a backup controller. The backup controller includes a backup path manager, a link monitor, and a backup packet processor. For at least one link of the routing node, the backup path manager identifies a backup routing path for forwarding affected data packets in the event of a failure of the at least one link. The link monitor monitors the plurality of links to determine when a link fails. When a link which has a backup routing path fails, the backup packet processor attaches backup routing path instructions to affected data packets routed over the failed link, and forwards the affected data packets via the backup routing path.Type: GrantFiled: February 3, 2004Date of Patent: January 17, 2006Assignee: Nortel Networks LimitedInventors: Andre N. Fredette, Loa Andersson, Naganand Doraswamy, Anoop Ghanwani -
Automatic protection switching using link-level redundancy supporting multi-protocol label switching
Publication number: 20050265228Abstract: A computer network has a plurality of routers that deliver data packets to the network via a plurality of links. At least one router provides automatic protection switching in the event of a link failure. The at least one router includes a plurality of data interfaces for streams of data packets to enter and exit the at least one router; and a backup controller. The backup controller includes a backup path manager, a link monitor, and a backup packet processor. For at least one link of the routing node, the backup path manager identifies a backup routing path for forwarding affected data packets in the event of a failure of the at least one link. The link monitor monitors the plurality of links to determine when a link fails. When a link which has a backup routing path fails, the backup packet processor attaches backup routing path instructions to affected data packets routed over the failed link, and forwards the affected data packets via the backup routing path.Type: ApplicationFiled: July 25, 2005Publication date: December 1, 2005Inventors: Andre Fredette, Loa Andersson, Naganand Doraswamy, Anoop Ghanwani -
Patent number: 6947428Abstract: A distributed LSR sends data from a first edge LSR, across a non-MPLS network, to a second edge LSR, thereby enabling a non-MPLS network to interface transparently with MPLS networks. This enables a VPN to use a public network to communicate from one portion of the network to another, remote portion. The distributed LSR includes an ingress gateway logically positioned between the first edge LSR and the non-MPLS network. This ingress gateway receives label requests from the first edge LSR. These label requests are multicast to several egress gateways. At least one egress gateway sends a message back indicating that it can transmit data to the destination. In response, the ingress gateway designates that egress gateway to be a designated gateway. The egress gateway then establishes a tunnel through the non-MPLS network to the ingress gateway.Type: GrantFiled: June 14, 2000Date of Patent: September 20, 2005Assignee: Nortel Networks LimitedInventors: Loa Andersson, Geoffery A. Mattson
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Patent number: 6931016Abstract: An apparatus and method of managing a virtual private network having a set of network devices maintains a network device memory set for storing a set of network device identifiers that identifies each of the set of network device. More particularly, a request to join the virtual private network is received from a given network device having a given network device identifier that identifies the given network device. The set of network device identifiers then is retrieved from the network device memory set to identify all network devices in the set of network devices. A notify message then is forwarded to each of the set of network devices, and a join message is forwarded to the given network device. The notify message includes the given network device identifier, while the join message includes the set of network device identifiers. The given network device identifier then is stored in the network device memory set.Type: GrantFiled: October 13, 1999Date of Patent: August 16, 2005Assignee: Nortel Networks LimitedInventors: Loa Andersson, Marcel Wiget, Tove Madsen
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Patent number: 6879594Abstract: A method for avoiding loops from forming when setting up label switched paths is provided. The method uses a Label Splicing Message is followed by an Acknowledgment message to determine if loops are formed in the process of joining a new node or subtree to a multicast MPLS tree. By verifying that the path towards the root of the MPLS tree is loop-free during the construction of the tree, this method complements the loop detection mechanism provided by the label switched protocol (LDP).Type: GrantFiled: June 7, 2000Date of Patent: April 12, 2005Assignee: Nortel Networks LimitedInventors: Cheng-Yin Lee, Loa Andersson
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Automatic protection switching using link-level redundancy supporting multi-protocol label switching
Publication number: 20040156310Abstract: A computer network has a plurality of routers that deliver data packets to the network via a plurality of links. At least one router provides automatic protection switching in the event of a link failure. The at least one router includes a plurality of data interfaces for streams of data packets to enter and exit the at least one router; and a backup controller. The backup controller includes a backup path manager, a link monitor, and a backup packet processor. For at least one link of the routing node, the backup path manager identifies a backup routing path for forwarding affected data packets in the event of a failure of the at least one link. The link monitor monitors the plurality of links to determine when a link fails. When a link which has a backup routing path fails, the backup packet processor attaches backup routing path instructions to affected data packets routed over the failed link, and forwards the affected data packets via the backup routing path.Type: ApplicationFiled: February 3, 2004Publication date: August 12, 2004Inventors: Andre N. Fredette, Loa Andersson, Naganand Doraswamy, Anoop Ghanwani -
Patent number: 6728777Abstract: A method to engineer paths for multicast traffic in an IP network, by directing the control messages to setup multicast trees on engineered paths, is disclosed. The multicast traffic engineering process is separated from the multicast route setup and the resources and the paths for multicast data delivery can be aggregated and independently allocated. Resources are allocated on the same trip when paths are selected and setup, and this prevents data from being forwarded on branches where resources have not been yet allocated. The traffic can be statistically multiplexed enabling the network operators to have control over the topology of the multicast trees and to provide differentiated services in a scalable manner.Type: GrantFiled: June 2, 2000Date of Patent: April 27, 2004Assignee: Nortel Networks LimitedInventors: Cheng Yin Lee, Loa Andersson
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Publication number: 20030152025Abstract: A computer network processes data packets in the event of a network link failure. The network includes a plurality of routers that deliver data packets to the network via a plurality of links. At least one router includes a protection cycle manager. The protection cycle manager has a protection cycle packet identifier and a protection cycle packet processor. The protection cycle packet identifier identifies, as protection cycle packets, data packets having a specific protection cycle format. The protection cycle packet processor processes protection cycle packets to determine whether the packet destination corresponds to the routing node, and if the packet destination corresponds to the routing node, the protection cycle packet is treated by the routing node as a data packet received from the packet source via the failed link. Otherwise, if the packet destination does not correspond to the routing node, the protection cycle packet is sent to a protection cycle node for the routing node.Type: ApplicationFiled: January 27, 2003Publication date: August 14, 2003Inventors: Loa Andersson, Kent Felske, Guo-Qiang Wang