248 results about "Link protection" patented technology

A method for MPLS link protection pre-builds backup LSP. When the LSP breaks down, it can redirect the LSP to the backup LSP within the minimal time and rearrange an auxiliary LSP after breaking down for a default time. By the guiding and the rearrangement, the method prevents the service of the MPLS from being unavailable when the MPLS breaks down and optimizes the utilization of the MPLS resources.

A master-backup protecting method of up-link on media gateway includes setting up up-link port protection set on MG, making master port set and back-up port set separately be energized state and forbidden state, using up-level software to continuously detect master port set and forbidding to use port of master port set when port on master port set is found to be abnormal, energizing port on back-up port set and switching master up-link set corresponding to master port set onto backup up-link set corresponding to backup port set.

A method comprises allocating a respective restoration path to protect each of a plurality of primary paths in a network. Each primary path has a plurality of nodes and at least two subpaths connecting the nodes of the primary path. Each restoration path includes at least one link. Each link protects at least one of the subpaths of the primary path. Each of the subpaths of the primary path is protected. None of the links in the restoration path is included in the corresponding primary path. At least one of the links is shared among at least two restoration paths corresponding to at least two of the primary paths.

A method of finding a primary communication path in a mesh network, which would be at once a protected path having a fully guaranteed segmented node or node-link protection. The method comprises defining a required protection type and further selecting each specific path segment of the desired communication path based on initial user's requirements and topology information of the network. Each specific node path segment N for the communication path is selected upon ensuring that it can be protected in the network by a node backup path satisfying the initial user's requirements. Each specific link path segment L for the communication path is chosen if it can be protected in the network by a link backup path satisfying the initial user's requirements and if the node path segment N to which segment L leads cannot be protected by a suitable node backup path.

This invention discloses a method for protecting ring network links including a main node and more than one transmission nodes, in which, said main node includes a primary port and a sub-port, and the method includes said main node transmits protocol messages to the transmission nodes from the main and sub-ports, if they have not received the messages in a certain period of time, said main node opens said sub-port. This invention also discloses a system and a device for ring link protection.

The invention provides double-homing protection method and device. According the method provided by the invention, a forwarding item synchronizing channel and a data sending channel are built between two PE (Provider Edge) devices of a double-homing node; and a PW (Pseudo Wire) and an LSP (Label Switched Path) protection group bearing the PE are built between an opposite end PE device and a logic device which is actually formed by two PE devices, thereby realizing the LSP protection in the network. Through the invention, the in-network protection and the access link protection do not influence each other, the management is simple.

The invention discloses a system for protecting an optical link of a passive optical network, a device thereof and a method thereof. The system comprises an optical line terminal, two optical splitters and a plurality of optical network units, wherein the optical line terminal is respectively connected with the two optical splitters through two lower connecting ports; the optical splitters the optical link which is from one lower connection port of the optical line terminal into a plurality of optical links; the plurality of optical network units respectively and correspondingly connect two upper connecting ports with one optical link on the two optical splitters; the mutually-protected optical links are formed between the optical line terminal and the two optical splitters; and the mutually-protected optical links are formed between each optical splitter and every two optical network units. By fast detecting the optical link, the invention effectively filters the dither of an optical signal on the optical link caused by the noise, the fault and the manual unplugging and plugging, thereby being capable of preventing from frequently switching between the two mutually-protected optical links.

This invention provides a switch protection method for links among satellites including: 1, generating service paths according to the service requirement of a terminal, 2, computing the interruption probability of each link in the service routes to select protection links for interruption protection, 3, setting up switch protection backup route between two switch nodes in the protection link, 4, when the protection link switches paths, it switches the current service between two nodes to said back up path. This invention applies a mode of resuming protection locally to recover the interrupted paths because of switch quickly to guarantee the durative of service communication and that related QoS target will not be broken.

The invention discloses a system and a method for realizing OLT (Optical Line Terminal) voice double upper-link protection based on OSPF (Open Shortest Path First Interior Gateway Protocol) routing protocol, and relates to the field of PON (Passive Optical Network). A CPU of an OLT master control panel in the system comprises an OSPF module and an RTM (Running Timer Meter) module. Two upper-link ports of an OLT are respectively connected with a NGN (Next Generation Network) through three-layer exchangers A and B to connect with a remote-end MGC (Media Gateway Controller) server; paths A and B are formed between the OLT and the MGC server; the OLT and the three-layer exchangers A and B are respectively configured with the OSPF protocols and operate; the OLT learns the routes of all network sections on the paths A and B through the OSPF route protocol; the OSPF module stores the learnt routes in the route table of the OSPF module and announces the learnt routes to the RTM module; and the RTM modules collects the route items and writes the route items in an RIB table. When a main link breaks, the OSPF route protocol learns the route of a backup link and carries out rapid protective rearrangement to the high real-time voice business among internetworking nodes.

The invention provides a link aggregation abnormity recovery method, an LACP (Link Aggregation Control Protocol) message processing method and exchange equipment. The link aggregation abnormity recovery method comprises the steps that the home-end exchange equipment receives an LACP message that is sent by the opposite-end exchange equipment and carries a request link protection event, and the home-end exchange equipment shuts down a receiving timer of the LACP message. According to the link aggregation abnormity recovery method and the exchange equipment, the receiving timer of the LACP message is shut down after the LACP message carrying the request link protection event is received, so that the equipment cannot detect a port of an opposite end to be unavailable due to the fact that the opposite-end equipment conducts abnormal events such as warm start and cannot send a data packet, normal forwarding of data cannot be influenced, and key network service can be influenced less.

The method comprises: pre-determining the traffic forwarding ratio of output interface corresponding to different link; according to the traffic forwarding ratio, outputting all messages via the corresponding output interface; due to different traffic forwarding ratios of output interfaces corresponding to different links, the different links can load different traffics while realizing the load balance and link protection such that the links with different physical properties can selected to be as equivalent chain.

The invention discloses a double PON ONU optical link protection switching device and protection method. The device comprises a first optical module, a second optical module, a first PON_MAC chip, a second PON_MAC chip, a complex programmable logic device CPLD, a multiplexer MUX and an exchange chip. The first optical module and the second optical module are connected with two different optical line terminals OLT to form a protection link hand in hand. According to the invention, an uplink interface RGMII of the exchange chip is in direct line connection with the PON_MAC chip interface, MDC/MDIO is in direct connection with the multiplexer, a control line is used to control the CPLD to complete a switching motion, and the problems in the prior art that the CPLD source is insufficient and the main-standby switching time is long are solved.

A fiber optic protection apparatus includes a first optical switch, a first fault detection device, and first switch control device. The first optical switch is placed at the reception node of an optical link and has a primary input port connected to a primary optical transmission path. A secondary input port is connected to one secondary optical transmission path. The first fault detection device is in communication with the primary optical transmission path to identify a fault within the primary optical transmission path and to generate a fault signal indicating type or location of the fault. The fault signal is transferred to the first switch control device that is in communication with the optical switch. This causes the optical switch to connect one of the secondary optical transmission paths to the reception node when the fault signal indicates that the primary optical transmission path has a fault.

The invention discloses a data forwarding method, device and system which are used in a two-layer virtual private network system. The two-layer virtual private network system comprises provider edges (PEs) and a customer edge (CE), wherein the main PE and the backup PE form a cross-node redundancy group (RG). The method comprises the following steps: automatically establishing a data channel for link protection with the backup PE; monitoring a current data transmission link; and when the current data transmission link fails, performing data forwarding through the backup PE and the data channel for link protection. According to the invention, the link delay as well as the packet loss can be reduced.

The invention provides a transport multiprotocol label switching (T-MPLS) network system and a link protection method. The network system comprises a main link, a ring network protection link, a linear protection link, a first switching module and a second switching module, wherein the main link comprises at least three main communication nodes; the ring network protection link is located between two adjacent main communication nodes; the linear protection link is located between the head main communication node and the tail main communication node of the main link; the first switching module is used for transmitting data messages through the ring network protection link between the two adjacent main communication nodes when the main link between the two adjacent main communication nodes fails; and the second switching module is used for transmitting the data messages through the linear protection link when the middle main communication node of the main link fails. The invention can provide more effective and reliable link protection for the T-MPLS network system.

The invention discloses a cross-equipment link protection method and a cross-equipment link protection system. The system comprises a protective group formed by master equipment in which an operating link is positioned and spare equipment in which a protective link is positioned, wherein the master equipment is used for sending switching decision information to the spare equipment; and the spare equipment is used for making decision according to the received switching decision information and sending synchronous notification to the master equipment according to a switch result of the decision. By the method and the system, networking of three network elements and four network elements can be subjected to the protection of a multiplexing section of cross equipment, so that the protective link protects the operating link.