Abstract: A method for restoring connectivity between a node in an IP Multimedia Subsystem, IMS, network, and a User Equipment, UE. The UE is associated with a Proxy Call Session Control Function node, P-CSCF, of said IMS network, and with at least one control node of a packet access network, through which the UE connects to the IMS network. The method allows for restoring the connectivity of the UE to an IMS network node after said IMS node has failed to establish a communication to said UE via said P-CSCF node.

Abstract: A method may include establishing a first Point-to-Point Protocol (PPP) session on an interface, receiving an indication of a layer one failure, omitting for a period of time, an indication that the first PPP session on the interface is down, based on the indication of the layer one failure, establishing a layer one switchover to another interface based on the indication of the layer one failure, and attempting during the period of time, to establish a second PPP session on the other interface.

Abstract: According to one embodiment of the disclosure, a non-transitory computer readable medium is described for an network device, where the medium comprising instructions which, when executed by one or more hardware processors, cause performance of a number of operations. These operations include configuring a first network device to provide network access to a client device using a first Basic Service Set Identification (BSSID) and determining that the first network device is not responsive. Based on determining that the first network device is not responsive, the one or more hardware processors further configure a second network device to provide the network access to the client device using the same first BSSID that was previously used by the first network device without the client device disassociating with the first BSSID.

Abstract: In one embodiment, a method comprises generating, by a first provider edge router associated with a first segment identifier, a primary label for reaching a destination, and repair information for reaching the destination if a second provider edge router is unavailable to reach the destination; allocating, by the first provider edge router, a first protected next-hop address associated with the first segment identifier for protected reachability to at least the destination; and sending via a core network, by the first provider edge router, an advertisement specifying the label and the repair information, enabling an ingress provider edge router to insert, into a data packet destined for the destination, the labels from the first provider edge router and the second provider edge router based on the repair information, for fast rerouting to the destination via one of the first or second provider edge router if the other is unavailable.

Abstract: The invention relates to routing messages over a network of interconnected devices of a networked control system, particularly to routing messages for individually controlling devices of a networked control system such as light sources of a lighting system. A basic idea of the invention is to determine a routing path for a message from a sender device to a destination device through the grid of interconnected devices of a networked control system, and to change the routing path, when a faulty device is contained in the routing path, in order to route the message around the faulty device, instead of determining an entirly new routing path. Thus, an efficient routing of a message over a network of interconnected device may be provided.

Abstract: A device determines a communication failure associated with a first network, and selects, based on the communication failure, a failover device from a list of failover devices. The device and the failover devices communicate via short-range communications, and the selected failover device connects to a second network. The device provides, to the selected failover device, a request to receive a service from the first network, and determines whether the selected failover device accepts the request. When the selected failover device accepts the request, the device establishes a communication channel with the selected failover device, and receives the service from the first network via the selected failover device, the communication channel, and the second network.

Abstract: Aspects of the present disclosure involve systems, methods, computer program products, and the like, for collaboration conferencing with multiple participants over a communications network, and more specifically for a conferencing routing service for managing and routing collaboration participants. In one embodiment, the conferencing system may utilize Session Initiation Protocol (SIP) to conduct the routing of the collaboration conferences within the telecommunications network. The SIP-based routing provides for the exchanging of information from one device of the conferencing system to another that is not available in non-IP based conferencing systems. Thus, through the use of IP-based telecommunication devices, the network provides beneficial features for collaboration conferencing.

Abstract: A method may include: (i) in response to clearing of a fault on a working path of a protection switching group to which a first network element is interfaced: (a) transitioning, by the first network element, its state to a first state in which a protection path of the protection switching group is active; and (b) initiating, by the first network element, a wait to restore timer, the wait to restore timer having a duration such that upon expiration of the timer, the first network element is configured to switch the working path to active; and (ii) in response to receiving a message from a second network element interfaced to the protection switching group indicating that a failure has occurred on the working path: (a) maintaining, by the first network element, its state in the first state; and (b) continuing, by the first network element, the wait to restore timer.

Abstract: The present invention is related to handling redundancy of a Policy and Charging Rules Function (PCRF) in a wireless communication network having an active PCRF, a standby PCRF and a Policy and Charging Enforcement Function (PCEF) by replicating accumulative quota usage of the active PCRF in a memory of the standby PCRF every time an update request is received at the active PCRF. The present invention is directed to a Policy and Charging Rules Function (PCRF) active in a wireless communication network having a standby PCRF and a Policy and Charging Enforcement Function (PCEF), wherein the PCRF includes a memory in which accumulative quota usage is stored. The PCRF includes a network interface unit which receives update requests.

Abstract: A system and method for providing communication over a compromised communication channel in a system having a first node and a second node connected via the communication channel is provided. For example, a signaling circuit may be provided. The signaling circuit includes a master signal electrically connected to first and second portions of the communication channel. The first and second portions of the communication channel are employed in the first node. The signaling circuit further includes a slave signal processor arrangement coupled to the master signal processor arrangement and electrically connected to third and fourth portions of the communication channel. The third and fourth portions of the communication channel are employed in the second node.

Abstract: Some embodiments provide a novel method for distributing control-channel communication load between multiple controllers in a network control system. In some embodiments, the controllers manage physical forwarding elements that forward data between several computing devices (also called hosts or host computers), some or all of which execute one or more virtual machines (VMs). The method of some embodiments distributes a controller assignment list to the host computers. The host computers use this list to identify the controllers with which they need to interact to perform some of the forwarding operations of their associated logical forwarding elements. In some embodiments, agents executing on the host computers (1) review the controller assignment list to identify the appropriate controllers, and (2) establish control channel communications with these controllers to obtain the needed data for effectuating the forwarding operations of their associated physical forwarding elements.

Abstract: In one example embodiment, a time unconstrained fabric switch software upgrade function is described for an in-switch-software-upgrade/downgrade (ISSU) in a network switch. Prior to an ISSU, Hello protocol data unit (PDU) information is stored for relevant control protocols of associated interfaces of the switch. The Hello PDU information comprises information on messages and data exchanged by the control protocols that may be used to maintain communications links of the switch. During the configuring of the ISSU, and while the control plane of the switch is, at least partially, dysfunctional, Hello PDUs are sent on the interfaces according to the stored PDU information in order to maintain the communication links. The Hello PDU information may include a time interval value for each relevant protocol that determines when Hello PDUs are sent.

Abstract: A mobile device establishes a first network connection via a first communication interface when the mobile device is in a first docking status with a docking station. The mobile device sends Voice over Internet Protocol (VoIP) traffic associated with a VoIP call via the first network connection, and activates a second network connection via a second communication interface when the mobile device is in the first docking status, where the second network connection is different than the first network connection. The mobile device re-directs the VoIP traffic via the previously activated second network connection based on a change in docking status of the mobile device with the docking station to a second docking status.

Abstract: Channel characterization and training within multiple user, multiple access, and/or MIMO wireless communications. Within such communication systems, there can be a number of devices (e.g., STAs) that communicate with a single device (e.g., AP). A multi-cast sounding frame may be transmitted from a transmitting device to a number of receiving devices. Appropriate scheduling or ordering of feedback signals from some or all of the receiving devices may be performed explicitly (e.g., sounding frame sent from the transmitting device to a receiving device) or implicitly (e.g., control information sent from the transmitting device to the receiving device, sounding frame sent to the transmitting device from the receiving device). Such characterization and training is with respect to a channel or path in which data will subsequently follow. Such characterization and training can be performed in accordance with group membership (e.g., with respect to only some of the receiving devices).

Abstract: Layered third-party (enhanced) application software redundancy is provided in a non-homogeneous virtual chassis including two or more switches coupled via a virtual fabric link. A virtual chassis management module within at least one of the switches discovers the other switches within the virtual chassis, determines a base master switch from all of the switches in the virtual chassis, detects an enhanced application installed on at least one enhanced switch and determines an enhanced master switch from the enhanced switches.

Abstract: Link identifiers such as VIDs, selected from a defined range of values, are locally assigned by each node on a link state protocol controlled Ethernet network to each of its links or adjacencies. The link identifiers are assigned by the nodes such that each link or adjacency at the node is uniquely identified by a different link identifier. A link state protocol adjacency notification mechanism or other flooding mechanism is used to disseminate the locally assigned link identifiers to other nodes on the link state protocol controlled Ethernet network. The link identifiers are added by the nodes to their topology databases to enable detour routes to be locally calculated by the nodes on the network in a distributed manner. Upon occurrence of a failure, the link identifiers are used to source route traffic around the failure so that traffic may continue to traverse the link state protocol controlled Ethernet network.

Abstract: A network node comprising at least one network interface the network node arranged to form network links to other network nodes through the or each network interface, each network link being to a neighboring one of the other network nodes, the network node arranged to determine whether data transmitted over the links to the relevant neighboring network nodes is successfully received. Should the network node make a first determination that data sent over a given network link to a neighboring node has not been successfully received, the network node temporarily disables the entry for that network link in a memory for a period of time, such that the network node does not send data to the neighboring node over the given network link during the period of time, but then subsequently re-enables the entry after the period of time has elapsed.

Abstract: A network adapter has a first and second virtual local area network (“VLAN”) device configured on each of first and second physical ports of the network adapter. The second VLAN devices are configured as a logically bonded, virtual device.

Abstract: An example method includes storing a portion of virtual PortChannel (vPC) information in a TRansparent Interconnect of Lots of Links network environment, deriving, from the portion of vPC information, a physical nickname of an edge switch to which a frame can be forwarded, and rewriting an egress nickname in a TRILL header of the frame with the physical nickname. In example embodiments, the vPC information can include respective vPC virtual nicknames, EtherChannel hash algorithms, hash values, and physical nicknames of edge switches associated with vPCs in the network environment. In some embodiments, the portion of vPC information can be derived from an Interested vPC Type Length Value (TLV) information of an Intermediate System to Intermediate System (IS-IS) routing protocol data unit (PDU).

Abstract: A method of performing protection switching in a network including a first node and a plurality of second nodes that are connected to the first node is provided. The first node counts the number of obstacles that have occurred in a plurality of paths that are connected between the plurality of second nodes, and if the counted number is smaller than a predetermined threshold value, the first node performs protection switching per leaf. Alternatively, if the counted number is equal to or larger than a predetermined threshold value, the first node performs protection switching per tree.

Abstract: A system and method for link failure handling includes detecting a failure in a first network connection between a first network switching unit and a second network switching unit, where the first network connection is associated with a first communication port of the first network switching unit; suspending the first communication port from a link aggregation group (LAG), where the first communication port is associated with the LAG; and associating one or more first inter-chassis link (ICL) ports with the LAG. The first ICL ports are associated with a first ICL coupling the first network switching unit to a third network switching unit. The first network switching unit and the third network switching unit are peers.

Abstract: A method for providing a Backup Label Switched Path for a specified Bypass Label Switch Path is disclosed. The method for providing a Backup Label Switched Path for a specified Bypass Label Switch Path includes establishing a Bypass LSP having an end-to-end path; obtaining the nodes traversed by the end-to-end path; generating a request to a path calculator which using the nodes provided on the end-to-end path calculates a path disjoint to those nodes; and signaling the calculated disjoint path as a Backup LSP for the Bypass LSP. The method for providing a Backup Label Switched Path for a specified Bypass Label Switch Path provides protection advantages over systems known in the art by providing capability for handling double failure scenarios.

Abstract: In one embodiment, a repair label switched path (LSP) is established for a primary LSP having a head-end node. The repair LSP extends from a neighboring upstream node of the head-end node to a downstream neighboring node of the head-end node. When a failure of the head-end node is detected, the neighboring upstream node reroutes traffic onto the repair LSP. The rerouted traffic rejoins the primary LSP at the downstream neighboring node. The neighboring upstream node refreshes state of the primary LSP to maintain the primary LSP after failure of the head-end node.

Abstract: A method and apparatus for neighbor discovery in a wireless communication system are disclosed. A neighbor seeking wireless transmit/receive unit (WTRU) may send a first beacon based on configuration information provided by the network. The neighbor WTRUs receive the first beacon and may send either a report to the network or send a second beacon to the neighbor seeking WTRU. The network may then provide neighbor WTRU information to the neighbor seeking WTRU. The neighbor discovery may be performed within a pre-defined group of WTRUs that is formed based on proximity to the WTRU and/or an attribute of the WTRU. The neighbor discovery procedure may be performed to find neighbor WTRUs in case where a WTRU fails to find any network. A neighbor list may be generated by the neighbor seeking WTRU by measuring reference signals transmitted by neighbor WTRUs on an uplink to the network.

Abstract: The invention relates to a method for determining a path between a first radio station and an access point of a radio communications system, whereby the radio communications system comprises additional radio stations. A frequency band subdivided into a number of subbands is used in order to communicate between, the radio stations. At least one subband for communicating is assigned to each radio station. The path extends over one or more of the additional radio stations so that information between the first radio station and the access point can be transmitted over the path. The path is at least partially determined by a radio installation apparatus on request of the first radio station. The radio installation additionally transmits, to at least a portion of the radio stations of the path, respective path identification information, subband information and radio station identification information.

Abstract: A method for configuring a router is disclosed. The method comprises providing router configuration information. The router configuration information is sent to the router over a cellular data network.

Abstract: A system for interfacing a client system in a first network domain with a Provider Link State Bridging (PLSB) domain includes at least two Backbone Edge Bridges (BEBs) of the PLSB domain. Each BEB is an end-point of a connection in the first network domain to the client system and an end-point of at least a unicast path in the PLSB domain. An inter-node trunk is provided in the PLSB domain for interconnecting the BEBs. A phantom node is defined in the PLSB domain and is notionally located on the inter-node trunk. Each of the BEBs is configured such that: an ingress packet received from the client system via the connection in the first network domain is forwarded through a path notionally rooted at the phantom node; and an egress packet destined for the client system is forwarded to the client system through the connection in the first network domain.

Abstract: An approach for call failover to a packetized voice session is described. Impending signal failure is detected on a cellular link supporting a cellular call with a user device. A failover procedure is initiated in response to the detection, wherein the failover procedure includes detecting presence of a wireless data connection, and terminating the cellular call and concurrently activating a voice call application to establish a packetized voice session over the wireless data connection with the user device.

Abstract: A method for enabling a mobile terminal to access to a wireless cellular telecommunication network including plural base stations, the mobile terminal having right to access to the wireless cellular telecommunication network through a first base station, the mobile terminal having no right to access to the wireless cellular telecommunication network through a second base station. The method includes: detecting reception of a message transferred by the mobile terminal to the second base station, determining if the first base station is operational, giving right to the mobile terminal to access to the wireless cellular telecommunication network through the second base station if the first base station is not operational, and rejecting right to the mobile terminal to access to the wireless cellular telecommunication network through the second base station if the first base station is operational.

Abstract: A distributed switch may include a hierarchy with one or more levels of surrogate sub-switches (and surrogate bridge elements) that enable the distributed switch to scale bandwidth based on the size of the membership of a multicast group. Moreover, each surrogate may optimize the hierarchy according to one or more optimization criteria. For example, each surrogate in the hierarchy may have the necessary information to ensure that if the next surrogate in the hierarchy is unavailable, the data may be routed to a backup surrogate. The selected hierarchy may be further optimized by skipping surrogates (or a surrogate level) such that the data intended for a skipped surrogate is sent to a surrogate in a lower-level of the hierarchy. This may better utilize the connection interfaces in the transmitting sub-switches and eliminate any unnecessary surrogate-to-surrogate transfers.

Abstract: Open Shortest Path First (OSPF) Non-stop Routing (NSR) with frozen standby LSDB is described. A network element includes a first OSPF instance initially acting as an active OSPF instance and a second OSPF instance initially acting as a standby OSPF instance. The second OSPF instance receives LSAs from the first OSPF instance and installs the LSAs in its LSDB. The LSAs in the LSDB are only aged by the active OSPF instance. If and when the second OSPF instance becomes the active OSPF instance, the second OSPF instance then ages the LSAs in the LSDB and processes each of the LSAs according to the aging of that LSA, where processing includes one of purging that LSA and refreshing that LSA.

Abstract: In a communication device having a modem subsystem and an Application Processing Engine (APE) that share an IP address, port number conflicts are avoided by a Port Reservation Agent (PRA) running on the APE. Apps executing on the modem subsystem must request to register a port number with the PRA prior to using it. If the address is available, the PRA creates a port reservation socket and associates the port number with the requesting app. If the requested port number is not available, the PRA returns an error and the app must request a different address. To apps executing on the APE, the port reservation sockets appear as port numbers associated with other apps executing on the APE. In this manner, port number conflicts between the modem subsystem and the APE are avoided.

Abstract: A method performed by network devices that includes operating in a normal mode, where the network devices form a virtual chassis that corresponds to a single logical network device; detecting when a failure within the virtual chassis occurs; executing a splitting process to form one or more new virtual chassis in correspondence to the failure; determining whether one of the one or more new virtual chassis operates as a functioning virtual chassis based on whether at least one of a set of criteria is satisfied, where the functioning virtual chassis operates according to resources configured for the virtual chassis; and operating as a nonfunctioning virtual chassis when it is determined that the one of the one or more virtual chassis does not satisfy the at least one of the set of criteria, where the nonfunctioning virtual chassis operates in a pass-through mode.

Abstract: A distributed switch may include a hierarchy with one or more levels of surrogate sub-switches (and surrogate bridge elements) that enable the distributed switch to scale bandwidth based on the size of the membership of a multicast group. Moreover, each surrogate may optimize the hierarchy according to one or more optimization criteria. For example, each surrogate in the hierarchy may have the necessary information to ensure that if the next surrogate in the hierarchy is unavailable, the data may be routed to a backup surrogate. The selected hierarchy may be further optimized by skipping surrogates (or a surrogate level) such that the data intended for a skipped surrogate is sent to a surrogate in a lower-level of the hierarchy. This may better utilize the connection interfaces in the transmitting sub-switches and eliminate any unnecessary surrogate-to-surrogate transfers.

Abstract: Techniques are described for separating control plane functions in a network device using virtual machines. The techniques include initializing multiple virtual machine instances in a control unit of a standalone router, and running different control processes for the router in each of the virtual machines. For example, in a root system domain (RSD)-protected system domain (PSD) system, a control unit of the standalone router may support a RSD virtual machine (VM) and one or more PSD VMs configured to form logical devices and execute logically separate control processes without requiring physically separate, hardware-independent routing engines to form the PSDs. Each of the RSD VM and PSD VMs includes a separate kernel, an operating system, and control processes for the logical device. When a software failure occurs in the PSD VM, the PSD VM may perform a software failover without affecting the operation of the RSD VM.

Abstract: A route determination device includes a memory to store a piece of route information of the route which is already calculated; and a processor to execute a process including: receiving a calculation request which requests route calculation; determining the route which conforms to the calculation request by performing the route calculation when the route information stored in the memory does not include the route which conforms to the calculation request; obtaining the route which conforms to the calculation request from the route information when the route information stored in the memory includes the route which conforms to the calculation request; storing the route information of the route determined by route determining processing in the memory; and sharing, with another route determination device which determines the route going through another node device among the plurality of node devices, the route information of the route determined by the route determining processing.

Abstract: An apparatus comprising a path computation element (PCE) configured to communicate with a path computation client (PCC) and compute a point-to-multipoint (P2MP) path across an autonomous system (AS) domain. Also included is a network component comprising at least one processor configured to implement a method comprising obtaining a computation request for a P2MP path across a plurality of AS domains, attempting to calculate the P2MP path across the AS domains, thereby generating a computed path or a failure reason, and transmitting a reply comprising the computed path or an indication of the failure reason. Included is a method comprising exchanging a request message and a reply message about a P2MP path across an AS domain between a PCC and a PCE.

Abstract: A method of Path Computation Element (PCE) Communication Protocol (PCEP) communication includes sending, to a path computation element (PCE), a request to compute a backup ingress node for a Point-to-Multipoint (P2MP) Label Switched Path (LSP) in a network, and receiving, from the PCE, the backup ingress node for the P2MP LSP in accordance with the request.

Abstract: A method and apparatus for reliable wireless voice, data and location communication for deployment in underground, industrial and other hazardous environments using a wireless mesh network. The network includes protocol for dispatch operation, emergency operation, remote supervision, remote status, asset control, machine state of health and operational management. The architecture is based on localized clusters of autonomous nodes capable of ad hoc interconnection with nearby nodes and connection to gateway nodes. The resulting network is an ad hoc mesh topology comprised of fixed mesh nodes with approximately 50% coverage overlap between nodes. This provides a reliable communication network for mobile nodes carried by personnel and sensor nodes that are fixed or mobile that supports voice, data and tracking/situation awareness. Each cluster of nodes transfers digital voice and data to gateway nodes either directly or through multi-hop transactions.

Abstract: Methods and systems are described for enabling an operative coupling to a network. In an aspect, first data is detected for forwarding between a first node in a first network and another node by a network relay including a first network interface hardware component operatively coupled to a first network. A determination is made that a second operative coupling to a second network of a second network interface hardware component in the network relay is disabled. The second network interface hardware component is configured to enabled the second operative coupling, in response to the determination. Data received for forwarding between the first network and the second network is forwarded via the enabled second operative coupling.

Abstract: A communication control method applicable to a mobile communication system provided with a first gateway device, which manages a home base station, on a first communication path between a core network device and the home base station, comprises: an establishment step of establishing, between the core network device and the home base station, a second communication path without passing through the first gateway device and passing through a second gateway device, in the case of switching to the second gateway device for managing the home base station in place of the first gateway device.

Abstract: A method is provided for facilitating preservation of session context information during an inter-radio access technology service retry. A user equipment (UE) may initiate a data transmission for a first service over a wireless communication session with a first network. Upon ascertaining that the first service has failed over the first network, a failover procedure is initiated by sending a service request for a second service to the first network. The second service may be distinct from the first service and has the effect of suspending the wireless communication session with the first network. The UE then resends the data transmission for the first service over a second network. The UE then resumes use of the wireless communication session over the first network after resending the data transmission over the second network. This resumption is done by using context information for the wireless communication session preserved prior to the suspension.

Abstract: An enhanced bypass mode simulcast radio communication system (200) includes a plurality of transmit/receive (T/R) sites (2101, 2102, 2103) configured to participate in a simulcasting communication session responsive to a control point system (201). A site controller (211) is responsive to determination of a timing malfunction at a first one of the T/R sites. In response, the site controller is configured to automatically terminate participation of the malfunctioning T/R site in the simulcasting communication session and perform further actions to cause the malfunctioning site to transition to a multisite mode of operation involving a network switching center (202). The simulcast system automatically adjusts its site timing to compensate for the loss of the T/R site in bypass.

Abstract: In general, various capabilities related to fault-resilient services within communication networks are presented. The services may include broadcast services, multicast services, unicast services, or the like, as well as various combinations thereof. A capability for providing local protection to unicast traffic at a node associated with a pair of redundant trees is presented herein. A capability for providing local protection to multicast traffic at a node associated with a pair of redundant trees is presented herein. A capability for constructing a pair of redundant trees is presented herein. A capability for constructing a pair of redundant trees includes partitioning a graph into a pair of partitions based on a link coloring mechanism and constructing the pair of redundant trees based on the pair of partitions.

Abstract: In one embodiment, a method comprises detecting, by a first provider edge router, a second provider edge router providing reachability to a prescribed destination address prefix via a protected next hop address; allocating, by the first provider edge router, a minor forwarding table associated with the second provider edge router and identifying a destination used by the second provider edge router for reaching the prescribed destination address prefix; and the first provider edge router sending repair information to a Border Gateway Protocol (BGP)-free core network router in the core network, the repair information enabling the BGP-free core network router to add a context label and reroute a received data packet to the first provider edge router if the second provider edge router is unavailable, the context label enabling the first provider edge router to identify the destination in the rerouted data packet for delivery to the destination address prefix.

Abstract: When stored identifying information of a transmission target frame and identifying information of a received frame are equal, a node apparatus updates transmission feasibility information stored in association with the final destination of the received frame. The transmission feasibility information indicates feasibility of transmission to each of a plurality of adjacent node apparatuses being a transmission destination, and is updated so that feasibility of transmission to the transmission destination associated with the identifying information of the received frame indicates that “the transmission is infeasible”. The node apparatus transmits the received frame, when there is no adjacent apparatus to which transmission is feasible, and when the stored identifying information of the transmission target frame is equal to the identifying information of the received frame, to the adjacent node apparatus recognized as the origin in association with the identifying information of the received frame.

Abstract: A first mobility management entity (MME) device receives an attachment request that includes information associated with a user device. The first MME device creates a context for the user device based on the information, stores the context, and creates an optimized context based on the context, wherein a size of the optimized context is smaller than a size of the context. The first MME device also identifies a second MME device that is a backup for the first MME device, and transmits the optimized context to the second MME device.

Abstract: A network node that provides egress fault protection for a primary egress node. The network node may receive a service label associated with an application from a primary egress node of a primary label switched path (LSP). The network node may use the service label to add a forwarding entry into a forwarding table associated with the primary egress node. Following a fault in the primary egress node, the network node may receive a data packet comprising an LSP label and the service label from a partial backup LSP. The network node may use the LSP label to locate the forwarding table associated with the primary egress node. The service label may be used to deliver the data packet to a destination node according to the forwarding table associated with the primary egress node.

Abstract: Techniques to optimize root network node selection for network tree paths are provided. A network disruption event is detected. Network nodes in the network are configured with root priorities. Network nodes in a first set of the network nodes operate as root nodes for ordered network tree paths. Root priority information is retrieved from a database for each of the network nodes. Based on the root priority information, network nodes are selected for a new set of network nodes to operate as new root nodes for new ordered network tree paths upon occurrence of the network disruption event. The new set of network nodes comprises common network nodes present in the first set. An order of the network nodes in the new set is determined such that at least one common network node in the new set is maintained in the same order as that in the first set.

Abstract: In one embodiment, a primary node in a shared-media communication network is selected by a node toward a destination. In response to determining the primary node, the node determines a frequency-hopping schedule of the primary node. One or more backup nodes for the primary nodes are then determined based on a frequency-hopping schedule diversity between the primary node and the one or more backup nodes.