WO2015007134A1 - 光突发交换环网中实现自动保护倒换的方法、***及节点 - Google Patents

光突发交换环网中实现自动保护倒换的方法、***及节点 Download PDF

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Publication number
WO2015007134A1
WO2015007134A1 PCT/CN2014/080349 CN2014080349W WO2015007134A1 WO 2015007134 A1 WO2015007134 A1 WO 2015007134A1 CN 2014080349 W CN2014080349 W CN 2014080349W WO 2015007134 A1 WO2015007134 A1 WO 2015007134A1
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Prior art keywords
node
control frame
fault
module
control
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PCT/CN2014/080349
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English (en)
French (fr)
Inventor
郭宏翔
张东旭
陈雪
伍剑
安高峰
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to JP2016526418A priority Critical patent/JP6529494B2/ja
Priority to US14/905,849 priority patent/US9998212B2/en
Priority to KR1020167003878A priority patent/KR101883084B1/ko
Priority to EP14826446.8A priority patent/EP3024159B1/en
Publication of WO2015007134A1 publication Critical patent/WO2015007134A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/03—Arrangements for fault recovery
    • H04B10/032—Arrangements for fault recovery using working and protection systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07955—Monitoring or measuring power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H04B10/275—Ring-type networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H04L12/437—Ring fault isolation or reconfiguration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
    • H04L41/0668—Management of faults, events, alarms or notifications using network fault recovery by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0066—Provisions for optical burst or packet networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/009—Topology aspects
    • H04Q2011/0092—Ring

Definitions

  • the present invention relates to network protection technologies, and more particularly to a centralized control optical burst switching ring network (OBRing, Optical Burst-switching Ring) implementation.
  • OBRing optical burst switching ring network
  • Optical Burst-switching Ring Automatic protection switching method, system and node.
  • OBRing can be used in the form of a dual-fiber self-healing ring commonly used in ring topology networking technology to support Automatic Protection Switching (APS).
  • OBRing's Fibre Channel is divided into a control channel and a data channel.
  • the control channel is dedicated to control plane signaling transmission, enabling dynamic bandwidth allocation, management configuration and other operations.
  • the provision of granularity and all-optical switching capability based on the sub-wavelength bandwidth of the optical burst packet is the core of OBRing, and the bandwidth allocation and resource scheduling methods, protection switching and service recovery methods are two key technologies of the OBRing control layer. Among them, protection switching and service recovery technologies are the basis for improving network survivability and ensuring network availability.
  • the self-healing ring technology used in the ring network technology including the two-fiber single (double) to multiplex section protection ring, the two-fiber single (double) to the shared channel protection ring, etc.
  • the basic principle is to use dual fiber or Multi-fiber networking, using rich resources as reserved protection channels to form 1: 1 or N: l protection; and protection switching such as wrapping mode, steering mode, and cut-through mode specified by the flexible packet ring standard
  • networks such as Optical Transport Network (OTN) and Packet Transport Network (PTN) also have corresponding protection switching mechanisms.
  • OTN Optical Transport Network
  • PTN Packet Transport Network
  • the basic network setting is that the node can perform photoelectric optical conversion on the service and control signals, but the OBRing only has the control channel capable of photoelectric photoelectric conversion, and the data Business in addition to the road The node can only be transparently penetrated through the node. Therefore, the protection switching method for performing service scheduling in the electrical domain cannot be directly applied to OBRing.
  • the closest to the OBRing network model is the elastic packet ring.
  • the steering mode protection switching of the elastic packet ring allows the default node to perform photoelectric optical conversion on the service. Therefore, the switching scheduling is simple, but it cannot be directly used in the OBRing network.
  • the bandwidth allocation control information is also There must be a path that can traverse all nodes at once and return to the master node, whereas the traditional distributed control-based steering mode does not consider this special requirement.
  • the cut-through mode is actually a node for photoelectric optical conversion. In the case of a power domain fault, the node can be directly crossed in the optical domain by switching, so that the remaining nodes of the network can continue to work.
  • the OBRing node It itself supports transparent penetration of services, and only control channels for photoelectric optical conversion, so the cut-through mode does not make much sense in OBRing.
  • the wrapping mode is similar to the two-fiber unidirectional multiplexing protection technology in SDH. It only performs switching in the optical domain.
  • the embodiments of the present invention provide a method, a system, and a node for implementing automatic protection switching in an optical burst switching ring network, which can implement a protection switching mechanism for an optical burst switching ring network to implement fault recovery and recovery.
  • Optical burst switching ring network communication quality Optical burst switching ring network communication quality.
  • an embodiment of the present invention provides a method for implementing automatic protection switching in an optical burst switching ring network, including the following steps: The primary node and the secondary node separately perform optical power monitoring on respective channels, and monitor The result is collected to the master node; when the master node determines that a fault occurs according to the monitoring result, the slave node sends a switching operation instruction to the slave node; the slave node performs the switching operation and enters the protection working state.
  • the optical power monitoring includes real-time monitoring of optical power states of the control channel and the data channel.
  • the assembling the monitoring results to the master node includes: The slave node carries the monitored monitoring result in the control frame, or adds a fault report message, and transmits the signal to the master node via the control channel; the monitoring result of the master node includes the optical power of the control channel and the data channel. The status of the monitoring results in real-time monitoring, and the monitoring results reported by each slave node through the control channel.
  • Determining the fault according to the monitoring result includes: when the monitoring result shows that only one control channel exists on a certain ring, and the data channel reports a loss of light, the fault result is a single fiber single point line fault; The monitoring result shows that when the control channel and the data channel of one node (position adjacent) on both rings are lost, the fault result is a double-fiber single-point line fault; when the monitoring result shows that only one node is controlled When the channel report is out of light, the fault result is the control channel transmitter failure; when the monitoring result shows that the control frame reception error occurs on both rings, the fault result is the node ⁇ of the non-master node.
  • the method further includes: the master node notifying the relevant node to avoid the unavailable wavelength channel, and reporting the situation to the network management system.
  • the method further includes: the each slave node feeding back to the master node a control frame indicating that the switching operation is successful; or feeding back a fault report response message indicating that the switching operation is successful corresponding to the fault report message. If the master node is at one end of the fault point, the method further includes: the master node performs a switching operation, switches the protection switch, and enters a protection state; otherwise, the master node directly enters a protection working state.
  • the method further includes: after receiving the switching operation instruction from the node, determining whether the node is a node at both ends of the fault point: if it is determined that the node is not the fault end node, directly enter the protection working state, and wait The master node performs bandwidth allocation again; If it is determined that it is a faulty end node, according to the switching operation instruction, the protection switch switching operation is performed and the protection working state is entered.
  • the protection switch switching operation includes: switching the optical switch from a parallel bar state to a cross-cross state in a normal working state; or, scheduling the control channel from one ring to another ring on the electrical domain.
  • the method further includes: the primary node and all the transceiver devices of each slave node share a control channel; the nodes are logically split into an upper node and a lower node, respectively corresponding to the original inner ring And the transceiver device on the outer ring; wherein, the upper node extracts bandwidth configuration information belonging to the uplink from the control frame, and performs OB transmission and reception according to the bandwidth configuration information, and the lower node extracts bandwidth configuration information belonging to the downlink from the control frame, And performing OB transmission and reception according to the bandwidth configuration information.
  • the master node is divided into an upper master node and a lower master node, and the method further includes: when the control frame flows through the upper master node, the bandwidth request information of the offline line is all collected in the upper master node, where the upper master After the node calculates the corresponding bandwidth configuration policy according to the bandwidth allocation algorithm, the node fills in the control frame.
  • the control frame flows through the first node of the offline line, the downlink bandwidth allocation policy carried in the node starts to take effect;
  • the control node approaches the primary node all bandwidth requests of the online node are submitted, and the corresponding uplink bandwidth allocation policy is updated by the bandwidth allocation algorithm.
  • the method further includes: performing, by the master node, ranging, and performing fine adjustment of the loop length according to the ranging result.
  • the method also includes: restoring normal transmission of traffic on the primary node and each of the secondary nodes. After the fault is repaired, the method further includes: the network issuing an instruction by the network management system to notify the master node and each slave node to resume from the protection working state to the normal double loop working state.
  • the returning to the normal double-loop working state includes: after receiving the instruction from the network management system, the primary node sends a control frame carrying a network recovery indication to the control channel, where the control frame is processed and forwarded at all path nodes.
  • the optical switch also switches from the cross state to the bar state in the normal working state, or stops the cross-loop forwarding of the control channel on the electrical domain to return to the normal working state.
  • the method further includes: the master node starts to perform another round of ranging immediately or after receiving the response from the slave node indicating that it is waiting. , bandwidth allocation, and reboot.
  • the embodiment of the present invention further provides a node, which is applied to an optical burst switching ring network of a two-fiber reverse ring network; the node includes a control channel processing module, a data channel receiving module, a data channel sending module, and protection.
  • the control channel processing module includes: a first power monitoring module, configured to detect an optical signal power status of the control channel, and output the control frame to the control frame parsing module after performing photoelectric conversion; and control the frame parsing module, Parsing the control frame content, and issuing a corresponding instruction to the data channel receiving module and the data channel sending module according to the bandwidth reservation information indicated in the control frame, performing normal data frame up and down; according to the processing situation of the node And notifying the control frame generating module to generate a new control frame; the control frame generating module, configured to receive a notification from the control frame parsing module or a failure notification of the data channel receiving module, generate a new control frame according to the notification, and generate a new control The frame is sent to the control frame sending module; the control frame sending module is configured to The new control frame from the control frame generating module is sent to the optical fiber line and transmitted to the downstream node.
  • a first power monitoring module configured to detect an optical signal power status of the control channel, and output the control frame to the control frame
  • the data channel receiving module includes: a second power monitoring module, configured to notify the monitoring of each wavelength to the monitoring result via the control interface a control frame generating module, configured to receive a control frame from the control channel processing module via the control interface, and receive an OB that should be locally down according to the bandwidth reservation information included in the control frame; the received OB
  • the optical signal is subjected to photoelectric conversion and local electrical domain buffering, and then sent to the user end; if the control frame received by the node is to instruct the node to perform a protection switching operation; the control frame parsing module is further configured to complete the control frame parsing, Notify the protection switch action.
  • the node is a master node, and further includes a fault judging module and a bandwidth allocation module, where the fault judging module is configured to collect the monitoring result on the local node; and parsed by the control frame parsing module from the control channel processing module In the information, obtaining optical power monitoring results of other nodes in the network, determining whether the network is faulty, and the fault type and the fault location according to the obtained monitoring result, and outputting the obtained fault result to the control in the control channel processing module a frame generation module; the control frame generation module in the control channel processing module is further configured to receive a bandwidth allocation result from the bandwidth allocation module and convert the data into a corresponding control frame data; receive a failure result from the fault determination module, according to The fault result generates corresponding signaling information and fills in the control frame, and sends a new control frame to the control frame sending module.
  • the embodiment of the present invention further provides a system for implementing automatic protection switching in an optical burst switching ring network, where the system is an optical burst switching ring network OBRing network of a two-fiber reverse ring network; the optical burst switching ring In the network, the control channel monopolizes one physical channel; the nodes in the optical burst switching ring network include a master node and a slave node; the nodes include a control channel processing module, a data channel receiving module, a data channel sending module, and a switching Protective switch used.
  • the node is a master node, and further includes a fault determination module and a bandwidth allocation module.
  • the technical solution provided by the embodiment includes that the master node and the slave node respectively perform optical power monitoring on respective channels, and collect the monitoring result to the master node; when the master node determines that the fault occurs according to the monitoring result, the switching operation instruction is sent to the slave node;
  • the slave node is the relevant node at both ends of the fault and performs the switch operation and enters the protection working state.
  • the invention introduces a protection switching mechanism for the optical burst switching ring network, realizes the processing of the fault, and ensures the communication quality of the optical burst switching ring network.
  • the method provided by the embodiment of the present invention uses different switching operations on the data channel and the control channel, that is, the data channel is switched from the dual-ring topology to the dual-bus topology, and the original dual-loop control channel is switched to form a large single ring. Therefore, the protection requirement of the control channel loop by OBRing is solved, the control channel can still operate according to the master-slave ring network working mode, and the utilization rate of the transceiver device on the data channel is fully utilized, and each of the maximum is utilized. The availability of transceivers on the node.
  • FIG. 1 is a schematic diagram of a conventional OBRing sub-wavelength switching optical network and its node structure
  • FIG. 2 is a flowchart of a method for implementing automatic protection switching in an optical burst switching ring network according to the present invention
  • FIG. 4( a ) is a schematic diagram of a network after protection switching in the embodiment shown in FIG. 5 according to the present invention
  • FIG. 1 is a schematic diagram of a conventional OBRing sub-wavelength switching optical network and its node structure
  • FIG. 2 is a flowchart of a method for implementing automatic protection switching in an optical burst switching ring network according to the present invention
  • FIG. 4( a ) is a schematic diagram of a network after protection switching in the embodiment shown in FIG. 5 according to the present invention
  • FIG. 1 is a schematic diagram of a conventional OBRing sub-wavelength switching optical network and its node structure
  • FIG. 2 is a flowchart of a method for implementing automatic protection switching in an optical burst
  • FIG. 4( b ) is an equivalent diagram of a network diagram in the embodiment shown in FIG. 5 of the present invention
  • FIG. 5 is a schematic diagram showing the internal logical structure of a slave node in the OBRing of the present invention
  • FIG. 6 is a schematic diagram showing the internal logical structure of the master node in the OBRing of the present invention.
  • 2 is a flowchart of a method for implementing automatic protection switching in an optical burst switching ring network according to the present invention. As shown in FIG. 2, the method includes the following steps: Step 200: The primary node and the secondary node respectively perform light on respective channels. Power monitoring, and the monitoring results are collected to the master node.
  • the master node and each slave node respectively monitor the optical power states (also referred to as optical path states) of the control channel and the data channel in real time.
  • the monitoring result of the optical path status monitored by the node may be carried in the control frame or the newly added fault reporting message, and transmitted to the primary node via the control channel; the monitoring result of the optical path status on the primary node includes its own control channel The monitoring result of real-time monitoring with the optical power state of the data channel, and the monitoring result reported by each slave node through the control channel.
  • Step 201 The master node sends a switching operation instruction to the slave node when determining that the fault occurs according to the monitoring result.
  • the OBRing network to which the method of the present invention is applicable is a two-fiber reverse ring network.
  • the fault that can be determined by the master node is mainly for the control channel caused by the single-fiber open circuit or the double-fiber open circuit, and the data channel fiber ring is interrupted.
  • the fault that is determined by the monitoring result and directly causes the network to malfunction may include: When the monitoring result shows that only one node has a control channel and the data channel reports a loss of light, the fault result is Single-fiber single-point line fault; When the monitoring result shows that the control channel and the data channel of one node (position adjacent) on both rings are lost, the fault result is double-fiber single-point line fault; when the monitoring result shows When only one node control channel reports the loss of light, the fault result is the control channel transmitter fault; when the monitoring result shows that the control frame receiving fault occurs on both rings, the fault result is the node of the non-master node (such as power supply) Invalid).
  • the master node sends a switch operation command to the slave node.
  • the protection switching operation of the present invention may not be performed, and the primary node only needs to notify the relevant node to avoid The wavelength channel that is not available can be reported, and the situation is reported to the network management system.
  • the master node can also send a switch operation instruction to the slave node.
  • Step 202 Perform a switching operation from the node and enter a protection working state.
  • the master node sends a control frame including a switching operation instruction to the slave node, and the slave node along the control frame compares the node identifier (ID) information carried in the control frame with its own ID, so that Check whether it is the node at both ends of the fault point (that is, the fault end node). If the two are inconsistent, it indicates that it is not the fault end node. Then the slave node directly enters the protection working state, and continues to forward the control frame downstream, waiting for the master node to restart. Perform bandwidth allocation; if the two are consistent, it indicates that it is a faulty end node, then the slave node makes a corresponding switchover operation according to the switching instruction.
  • ID node identifier
  • node uses the optical switch as the protection switch, then only the parallel bar state in the normal working state is switched to the cross-cross state, and the inner ring and the outer ring control channel are merged together; if the node does not use the optical switch to perform the switching, It is also possible to directly dispatch the control channel signal to be sent to the fault point to another ring direction in the electric domain, that is, to merge the original independent inner and outer loop control channels into one large ring.
  • FIG. 3 it is assumed that node 1 in FIG. 3 is the master node, and the fault is the fiber breakage occurring between the slave node 3 and the slave node 4.
  • the original two independent ring topology networks are switched to form two linear topology networks.
  • the network logic can be regarded as a total of 2N.
  • a new network of nodes originally N nodes
  • this new network features a data channel with two independent linear topologies, while sharing a control channel for a ring topology.
  • each node of the network automatically enters the protection working state, that is, the protection mode.
  • the original dual-ring dual control channel network is changed to, the master node and each slave node share a control channel in the protection state.
  • the sending and receiving of all the nodes is the same as that of the normal state.
  • the OB is sent and received according to the bandwidth configuration information carried in the control frame.
  • each node in the normal working state, the inner ring and the outer ring respectively have their own ring control channels, and each node independently performs bandwidth allocation on the two rings; and in the protection working state, each node has only one shared ring control channel. Used to simultaneously transmit bandwidth configuration information containing two bus topology networks.
  • each node can be logically split into an upper node and a lower node, respectively corresponding to the transceiver devices on the original inner and outer rings, and the upper node from the control frame.
  • the bandwidth configuration information belonging to the uplink is extracted, and the OB is transmitted and received according to the bandwidth configuration information, and the lower node extracts the bandwidth configuration information belonging to the downlink from the control frame, and performs OB transmission and reception according to the bandwidth configuration information.
  • the data channel is changed from the reverse double-ring topology under normal conditions to the reverse dual-bus topology in the protected state, while the control channel is connected at both ends of the two buses, still forming a ring. Channel. That is to say, it corresponds to all the nodes on the two rings in the normal state, and one control channel ring is shared in the protection state.
  • the control channel can still operate in the master-slave ring network working mode, and on the other hand, the availability of the transceiver device on each node is maximized.
  • the bandwidth allocation algorithm is different from the normal working mode.
  • the master node 1 can be divided into the upper master node 1 (on 1 in FIGS. 4(a) and 4(b)) and the lower master node. 1 (1 in Fig. 4(a) and Fig.
  • Step 202 further includes: if the primary node happens to be at one end of the fault point, the master node itself performs a switching operation, switches the protection switch, and enters a protection state; otherwise, the primary node directly enters a protection working state.
  • Step 202 further includes: each slave node feeding back to the master node a control frame indicating that the switching operation is successful, or a fault report response message indicating that the switching operation is successful corresponding to the fault report message.
  • the method of the invention introduces a protection switching mechanism for the optical burst switching ring network, realizes the processing of the fault, and ensures the communication quality of the optical burst switching ring network.
  • the physical network of OBRing is based on the passive optical loop. After the switching operation is completed, the physical topology of the data channel and the control channel changes. Therefore, in order to satisfy the control frame length and data frame length in OBRing, the network ring length is long.
  • the method of the present invention further includes: the master node performs ranging, and performs fine adjustment of the loop length according to the ranging result to satisfy an integer multiple constraint relationship between the loop length and the frame length. It should be noted that the implementation of ranging and ring length fine adjustment is common knowledge of those skilled in the art, and the specific implementation is not limited to the scope of protection of the present invention, and therefore will not be described herein.
  • the network can resume the normal transmission of the service.
  • the behavior of each node for the control channel and the data channel is basically the same as that of the normal dual-ring working state, and the difference is only in At the master node, the master node needs to allocate bandwidth according to bandwidth requests from the two buses, and the bandwidth allocation results on the two buses are simultaneously transmitted in the same control channel.
  • the method of the present invention further includes: the network can restore the node from the protection working state to the normal double loop working state by using any feasible manner, for example, by using the network management system to issue an instruction.
  • the primary node after receiving the instruction from the network management system, the primary node sends a control frame carrying a network recovery indication to the control channel, where the control frame is processed and forwarded at all path nodes, after which the node suspends all services and waits A new round of restarts.
  • the nodes at both ends of the fault segment terminate the service transmission, and further switch the switchover to the original state of the double loop operation through the optical switch, that is, when the optical switch is switched from the cross state to the normal working state. Bar state;
  • the master node After the master node sends the control frame carrying the network recovery indication, it can start a new round of ranging, bandwidth allocation, and restart immediately or after receiving the response from the slave node indicating that it is waiting.
  • the network then returns to normal dual-ring operation.
  • the above method of the present invention solves the problem that the centralized control OBRing network does not have a suitable protection switching mechanism, and introduces a protection switching mechanism for the optical burst switching ring network, thereby realizing the processing of the fault and ensuring the optical burst switching ring network. Communication quality; Moreover, the method of the invention adopts different switching operation modes for the data channel and the control channel, which not only solves the protection requirement of the OBRing for the control channel loop, but also ensures that the control channel can still operate according to the master-slave ring network. Operation, taking into account the utilization of transceivers on the data channel, maximizes the availability of transceivers at each node.
  • the method of the present invention is based on the OBRing network shown in FIG. 1.
  • FIG. 1 at least the following functions are included: two fiber loops (in order to form protection, the data flows on the two rings are opposite), The ring is used for work and the ring is used for protection. In particular, for services, it is normally only sent and received in one fiber ring, and the other ring is used to protect low-priority services and can only be sent and received in the protection ring.
  • the control channel monopolizes one physical channel: each fiber The physical channel is divided according to the wavelength resource, the control channel occupies at least one wavelength channel, and the control signal clocks are all synchronized with the master node; centralized bandwidth allocation control: the control frame transmitted in the control channel will be local when passing each node The bandwidth request information is filled in the control frame, so that all the bandwidth request information is collected to the master node in each ring cycle.
  • the primary node performs bandwidth allocation centrally, and the allocation result is filled into the control frame, and is sent to each node in the next ring cycle; the node is divided into the master-slave relationship, and the primary node is responsible for global scheduling, including performing the bandwidth allocation strategy, and controlling The channel coordinates the transmission and reception timing between the nodes to achieve dynamic sub-wavelength switching while avoiding conflicting contention.
  • the physical structure of the master node and the slave node are identical; the node is equipped with the same complete set of transceiver devices in the two ring directions, wherein each includes a processing module and a processing module of the data channel;
  • the length of the OB packet is a fixed value during system operation, and the loop length is an integer multiple of the OB packet length; a single point of failure occurs in the network, whether it is a node fault or a fiber break, and where the fault location is, because of the inherent nature of the dual loop topology Characteristic, all nodes can also communicate with the primary node in at least one ring direction. At this time, the transceiver devices of all nodes must be synchronized with the primary node; based on the network structure shown in Figure 1, there are two on each node.
  • the fiber passes, from the perspective of the whole network, it can be divided into an inner ring and an outer ring.
  • the traffic flow on the two rings is reversed, similar to the ringletO and ringletl cases in the elastic packet ring network.
  • the functional modules mounted on the inner ring and the outer ring are also the same, only the difference in service flow.
  • DEMUX demultiplexer
  • the control signal enters the processing module of the control channel to perform power.
  • the logical processing of the domain, while the data channel continues to travel in the optical domain, and then through a certain ray delay line, and then a part of the signal energy is coupled to the data channel receiving module through the coupler.
  • the control channel processing module is further configured to control the sending module of the data channel, and send the local uplink signal to the corresponding wavelength and OB time slot; meanwhile, the control channel processing module is further configured to use the updated control frame and the uplink
  • the data frames are sent together through the coupler to the fiber optic line.
  • an optical switch must be separately set.
  • the optical switch is used to maintain the state in which the outer ring and the inner ring are not crossed in a normal network operation state, and the inner ring and the outer ring are cut to the bridge state when the network enters the protection switching mode. Further, the optical switch can select an optical switch with a wavelength selection capability, so that when switching, it is possible to flexibly select which wavelength to switch to the switching state.
  • the internal logical composition of each node is as shown in FIG. 5, and includes a control channel processing module, a data channel receiving module, a data channel sending module, and a protection switch, where The control channel processing module includes: a first power monitoring module, configured to detect an optical signal power condition of the control channel, and perform photoelectric conversion, and output the control frame to the control frame parsing module.
  • control signal should always have stable optical power, and can go through a photoelectric conversion to enter the control frame analysis module; if the monitoring result shows "light loss" (indicating that the control channel transmitter of the upstream node is faulty or may be upstream
  • the node is disconnected from the node, and the situation is immediately reported to the control frame generation module;
  • the control frame parsing module is configured to parse the control frame content, and according to the bandwidth reservation information indicated in the control frame to the data channel
  • the receiving module and the data channel sending module issue corresponding instructions to perform normal data frame up and down. Since the control frame also needs to continue to be forwarded downstream, a part of the control information continues to enter the control frame generation module after the control frame parsing is completed, so as to generate a new control frame.
  • control frame parsing module should notify the protection switch to perform the switching action.
  • a control frame generating module configured to receive the information from the control frame parsing module or the fault notification of the data channel receiving module, generate a new control frame according to the notification, for example, fill in a corresponding fault feature in a corresponding field of the control frame, and add a new control
  • the frame is sent to the control frame sending module, and the control frame sending module is configured to send the new control frame from the control frame generating module to the optical fiber line and transmit the signal to the downstream node.
  • the control frame transmission module is physically a control channel transmitter.
  • the optical switch is configured to receive an action notification from the control frame parsing module, and perform a switching operation.
  • the data channel receiving module includes: a second power monitoring module for monitoring for each wavelength. As long as the optical power loss of one or some or all wavelengths is detected, indicating the possibility of an upstream node failure or a link failure, this information will be notified to the control frame generation module via the control interface; a quick selection switch for control via The interface receives the control frame from the control channel processing module, and accurately receives the OB that should be locally down according to the bandwidth reservation information contained in the control frame. These OB optical signals are optically converted and buffered in the local electrical domain, and then received by other subsequent upper modules and finally sent to the user.
  • the local electrical domain cache belongs to the existing module, and is not described here.
  • the data channel sending module is configured to upload the local service data in the form of an OB according to the bandwidth allocation information carried in the control frame.
  • FIG. 6 is a schematic diagram showing the internal logical structure of the master node in the OBRing of the present invention. As shown in FIG. 6, the master node is also responsible for global control and scheduling, and therefore, is outside the functional modules shown in FIG.
  • the master node further includes a fault judging module and a bandwidth allocation module, wherein the fault judging module is configured to collect the monitoring result on the node; and obtain optical power monitoring of other nodes in the network from the information parsed by the control frame parsing module.
  • the control frame generating module As a result, according to the obtained monitoring result, determining whether the network is faulty, and the fault type and the fault location, and outputting the obtained fault result to the control frame generating module; the control frame generating module, the processing having the function shown in FIG. 5, And receiving the bandwidth allocation result from the bandwidth allocation module and converting into corresponding control frame data; receiving the fault result from the fault judging module, generating corresponding signaling information according to the fault result, filling in the control frame, and adding new control The frame is sent to the control frame transmission module.
  • generating corresponding signaling information according to the fault result includes issuing a switching instruction, a ranging instruction, and a system restart instruction.
  • each node uses its optical power monitoring module for real-time power monitoring. Power monitoring on the control channel or data channel can be considered to be a fault if either side "lights out”.
  • Both the control channel and the data channel in both ring directions can detect light (or the data channel has no wavelength at each wavelength) Or, no light is detected on the control channel in one ring direction, there is light on the data channel (or no light at individual wavelengths), and light can be detected in the other ring direction; or, control in a certain ring direction
  • the channel and the data channel do not detect light at the same time.
  • both the control channel and the data channel in both ring directions can detect light (or individual wavelengths of the data channel without light), that is, individual data at the upstream node.
  • the transmitter of the channel wavelength may be faulty, but only affects the data channel of one node, and does not affect the normal operation of the control channel and other nodes of the network.
  • the node only needs to fill in the corresponding monitoring information in the control frame normally; according to the above monitoring result, in the second scenario, that is, no light is detected on the control channel in a certain ring direction, and light is on the data channel. (or individual wavelengths are dull), and light can be detected in the other ring direction. That is to say, a control channel fault occurs at the upstream node. At this time, the node that detected the fault cannot receive the upstream transmission.
  • a new control frame should be assembled immediately, and the fault result is marked in the corresponding field, and sent to the master node from the ring direction connected with the master node;
  • the control channel and the data channel in a certain ring direction cannot simultaneously detect the light, that is, the fiber line on one side of the node is broken, which may be Double fiber, or single fiber broken.
  • the node that detects the fault also immediately assembles a new control frame and identifies the fault result, and sends it to the master node in the direction of communication with the master node.
  • the common node transmits the fault result information to the master node through the control channel in the above three cases, and the master node comprehensively judges according to the information sent by all the nodes, and determines whether to send the inclusion.
  • the control frame of the specific switching instruction Specifically, taking FIG. 3 as an example, when a double fiber break occurs between the node 3 and the node 4, the third scenario in the above fault scenario is detected on the node 3, for example, the outer loop control channel and the data channel are simultaneously dull. The inner ring can also monitor the light; the third scenario in the above fault scenario is also detected on node 4, which shows that the inner loop control channel and the data channel have no light at the same time, and the outer loop can detect the light.
  • node 3 and node 4 immediately send the respective monitored fault results to the master node 1.
  • the node 3 obtains a synchronous clock through the control channel connected to the active node by the inner ring, and the control frame is sent to the primary node 1 through the outer loop control channel, and the node 4 is oppositely obtained, and the clock of the master node is obtained through the outer loop control channel. Synchronization, and the fault result is sent to the master node 1 via the inner loop control channel.
  • the master node 1 determines, via the fault judging module, a control frame indicating the switching operation, which is sent out from the control channels in two directions.
  • the slave node on the ring When the slave node on the ring receives the control frame containing the switching instruction from the master node 1, it first determines whether it is the node at both ends of the fault point. If it is not the faulty node, it directly enters the protection state, and waits for the master node to re-bandrate the bandwidth. If it is a faulty end node, the corresponding optical switch switching operation is performed according to the switching instruction. As shown in FIG. 3, node 3 and node 4 function as fault end nodes, and optical switch switching is performed, and node 1 and node 2 are not The fault end node directly enters the protection state.
  • each slave node may send a control frame indicating that the operation is successful to the master node 1, and the master node starts to re-pair the network after all the nodes are ready. Further, after the ranging is completed, the master node 1 sends a normal bandwidth allocation control frame, so that each node in the network starts to perform normal OB transmission and reception under the unified scheduling of the control channel. Further, after the network is in the protection state, until the fault is eliminated, and the network management device issues the restoration command, the master node 1 sends a control frame including the restoration instruction from the control channel, so that, for the ordinary node, the control including the restoration instruction is received.
  • the frame means to exit the protection state, resume normal operation, and wait for the new round of bandwidth allocation of the master node to start.
  • the fault judging module periodically checks the fault result information collected by the fault judging module. When the judging module judges that it is a fault that needs to be switched, it includes single/double fiber single point fiber breakage, control channel fault, node fault, etc. When a control frame is generated and a switching instruction is carried therein.
  • the master node further determines the location of the fault while determining the fault. There are many different ways of judging. There is no limitation here.
  • the downstream node reports the fault information from the node with ID n
  • the node n is a downstream node adjacent to the fault point
  • the other ring direction is the same. In this way, by judging the judgments in the two ring directions, two fault end nodes can be determined. If the master node happens to be at the fault point end, the master node itself performs a switching operation, switches the optical switch and enters the protection state. Otherwise, the master node directly enters the protection working state.
  • the master node optionally waits for all nodes to return a feedback information control frame for successful switching, or defaults all nodes to enter a protection state to save network signaling time, and performs network ranging. After the ranging is completed, the master node starts to send the bandwidth allocation control frame and performs the normal transmission and reception OB. After the fault elimination network management releases the restoration command, the master node sends a control frame containing the restoration instruction to each node in the network to make the network exit protection. Working state, restart normal double-loop working state.

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Abstract

一种光突发交换环网中实现自动保护倒换的方法、***及节点，包括主节点和从节点分别对各自的信道进行光功率监测，并将监测结果汇集到主节点；主节点根据监测结果确定发生故障时，向从节点发送倒换操作指令；从节点进行倒换操作并进入保护工作状态。通过本发明，为光突发交换环网引入保护倒换机制，实现了对故障的处理，保证了光突发交换环网通信质量。进一步地，本发明方法通过对数据信道和控制信道采用不同的倒换操作方式，既解决了集中控制的光突发交换环网对控制信道环路的保护要求，保证了控制信道依然能够按照主从式的环网工作模式运作，又顾全了数据信道上收发设备的利用率，最大限度地发挥了每个节点上收发设备的可用性。

Description

光突发交换环网中实现自动保护倒换的方法、 ***及节点 技术领域 本发明涉及网络保护技术，尤指一种集中控制的光突发交换环网（OBRing, Optical Burst-switching Ring) 中实现自动保护倒换的方法、 ***及节点。 背景技术 互联网的不断发展， 特别是随着用户数量的增多、 带宽需求量的持续增长， 以及 云服务模式的普遍推广， 使得传统的城域汇聚网络越来越难以应付业务对于带宽提供 的高灵活性、 高可靠性以及低能耗的要求。 在这样的需求背景下， 光突发交换环网 (OBRing, Optical Burst-switching Ring) 作为一种能够提供子波长交换粒度的全光组 网技术得到了广泛的研究和重视。如图 1所示， OBRing—般可采用环形拓扑组网技术 中常用的双纤自愈环形式， 可支持自动保护倒换 （APS， Auto Protection Switching) 。 OBRing的光纤信道分为控制信道和数据信道，其中，控制信道专门用于控制平面的信 令传送， 实现动态的带宽分配、 管理配置等操作。 基于光突发包的子波长带宽提供粒 度和全光交换能力是 OBRing的核心所在， 而带宽分配和资源调度方法、 保护倒换和 业务恢复方法是 OBRing控制层面的两大关键技术。 其中， 保护倒换和业务恢复技术 是提高网络生存性、 保障网络可用性的基础。 由于环网拓扑的固有特征， 在网络出现故障时， 一般可以通过保护倒换操作自动 进入保护模式， 尽可能地利用残存的网络连通性提供最大的可用带宽， 并最大程度地 减小业务中断时间， 直到故障修复后恢复到正常工作状态。 对于城域光网络采取环形组网的保护倒换， 在现有技术方案中， 有同步数字体系
( SDH) 环网技术中用到的自愈环技术， 包括二纤单 （双） 向复用段保护环、 二纤单 (双） 向共享通道保护环等， 基本原则都是用双纤或多纤组网， 把富裕的资源作为预 留保护通道，形成 1 : 1或 N: l 保护；还有弹性分组环标准规定的 wrapping模式、 steering 模式以及直通转发 （cut-through) 模式等保护倒换方案； 此外， 光传输网络 （OTN， Optical Transport Network) ， 分组传输网络 (PTN, Packet Transport Network) 等网络 也有相应的保护倒换机制。 但是， 上述现有的相关技术方案都是针对各自网络架构设 计的， 却尚未有任何方案可以直接适用于 OBRing的特定情况。 从技术上看， 由于现 有的环网保护倒换技术方案中， 基本的网络设定都是节点对业务和控制信号都能进行 光电光转换， 但是 OBRing只有控制信道能进行光电光转换， 而数据业务除了上下路 以外只能透明地穿通节点， 因此， 凡是在电域内进行业务调度的保护倒换方式均无法 直接应用到 OBRing。 在现有的支持保护倒换的环网技术中， 与 OBRing网络模型最接近的是弹性分组 环。 然而， 弹性分组环的 steering模式保护倒换， 默认节点能够对业务进行光电光转 换， 因此倒换调度简单， 但也无法在 OBRing网络中直接使用， 尤其对于集中式控制 的 OBRing, 带宽分配的控制信息还必须有能够一次遍历所有节点并回到主节点的通 路，而传统的基于分布式控制的 steering模式没有考虑这种特殊要求。 cut-through模式 事实上也是针对光电光转换的节点， 电域处理故障的情况下可以通过倒换将此节点在 光域直接跨越， 从而保证网络剩余的节点还可以继续工作， 但是， 在 OBRing中节点 本身就支持对业务的透明穿透， 仅控制通道进行光电光转换， 所以 cut-through模式在 OBRing中意义不大。 wrapping模式类似 SDH中的二纤单向复用保护技术， 仅在光域 完成倒换， 不但支持光电光网络， 也可以支持全光组网技术， 但是， 现有 wrapping模 式的相关技术方案同样存在没有针对集中式控制的 OBRing的特点加以改进以便适用； 而且， wrapping模式在全光交换的 OBRing中会造成备用光纤上的收发设备因进入保 护模式而停止数据收发工作， 从而形成资源浪费， 所以从业务恢复角度来说， 也并非 最优的方案。 综上， 对于能够提供子波长交换粒度的集中式控制 OBRing全光交换网络， 目前 还没有保护倒换和业务恢复的具体实现技术方案。 发明内容 本发明实施例提供了一种光突发交换环网中实现自动保护倒换的方法、 ***及节 点， 能够为光突发交换环网引入保护倒换机制， 实现对故障的处理和恢复， 保证光突 发交换环网通信质量。 为了解决上述技术问题， 本发明实施例提供了一种光突发交换环网中实现自动保 护倒换的方法， 包括以下步骤： 主节点和从节点分别对各自的信道进行光功率监测， 并将监测结果汇集到主节点； 主节点根据监测结果确定发生故障时， 向从节点发送倒换操作指令； 从节点进行倒换操作并进入保护工作状态。 所述光功率监测包括对控制信道和数据信道的光功率状态进行实时监测。 所述将监测结果汇集到主节点包括： 所述从节点将监测到的监测结果携带在控制帧， 或者新增故障汇报消息中， 并经 由控制信道传送给主节点； 所述主节点的监测结果包括自身对控制信道和数据信道的光功率状态进行实时监 测的监测结果， 以及各个从节点通过控制信道上报的监测结果。 所述根据监测结果确定发生故障包括： 当所述监测结果显示为仅某一环上存在一个节点的控制信道、 数据信道均报告失 光时， 故障结果为单纤单点线路故障； 当所述监测结果显示为两个环上分别有一处节点 （位置相邻） 的控制信道和数据 信道均失光时， 故障结果为双纤单点线路故障； 当所述监测结果显示为仅某一节点控制信道报告失光时， 故障结果为控制信道发 射机故障； 当所述监测结果显示为两个环上均发生控制帧接收失常时， 故障结果为非主节点 的节点瘫痪。 当所述故障结果存在个别数据信道波长故障， 不影响网络整体运作的情况时， 该 方法还包括： 所述主节点通知相关节点避开不可用的波长信道， 同时将情况上报给网管***。 该方法还包括： 所述各从节点向主节点反馈表示倒换操作成功的控制帧； 或者， 反馈对应于所述故障汇报消息的表示倒换操作成功的故障汇报响应消息。 如果所述主节点处于故障点一端， 该方法还包括： 所述主节点自身执行倒换操作， 切换保护开关并进入保护状态； 否则， 所述主节点直接进入保护工作状态。 所述从节点进行倒换操作之前， 该方法还包括： 从节点接收到倒换操作指令后， 判断自身是否是故障点两端的节点： 如果判断出不是故障端节点， 则直接进入保护工作状态， 并等待所述主节点重新 进行带宽分配； 如果判断出是故障端节点， 则根据倒换操作指令， 进行保护开关切换操作后进入 保护工作状态。 所述保护开关切换操作包括： 将光开关从正常工作状态时的平行 bar状态切换到 交叉 cross状态； 或者， 在电域上将控制信道从一个环转调度到另一环上。 所述进入保护工作状态后， 该方法还包括： 所述主节点和各从节点的所有收发设 备共享一个控制信道； 所述各节点逻辑上拆分成上节点和下节点， 分别对应原来内环和外环上的收发设 备； 其中， 上节点从控制帧中提取属于上路的带宽配置信息， 并根据该带宽配置信息 进行 OB收发， 下节点则从控制帧中提取属于下路的带宽配置信息， 并根据该带宽配 置信息进行 OB收发。 所述主节点分为上主节点和下主节点， 该方法还包括： 所述控制帧流经上主节点时， 下线的带宽请求信息全部汇集到所述上主节点中， 所述上主节点根据带宽分配算法计算出相应的带宽配置策略后填写到控制帧中， 当这 一控制帧流经下线的第一个节点时， 其中所携带的下线带宽分配策略开始生效； 相应地， 所述控制帧途径下主节点时， 提交上线节点的所有带宽请求， 并通过带 宽分配算法更新对应的上线带宽分配策略。 该方法还包括： 所述主节点进行测距， 并根据测距结果进行环长微调。 该方法还包括： 在所述主节点和各从节点上恢复业务的正常传送。 在故障修复后， 该方法还包括： 网络通过网管***下达指令， 通知所述主节点和 各从节点从保护工作状态恢复到正常双环工作状态。 所述恢复到正常双环工作状态包括： 所述主节点接收到来自网管***的指令后， 向控制信道上发送出携带有网络恢复 指示的控制帧， 该控制帧在所有途径节点处被处理和转发； 所述途径节点暂停所有业务， 等待新一轮重启， 同时， 所述故障段两端的节点在终止业务发送时，还将光开关从 cross状态切换到正常工 作状态时的 bar状态， 或者， 停止控制信道在电域上的跨环转发， 恢复到正常工作状 态。 所述主节点发送完携带有网络恢复指示的控制帧后， 该方法还包括： 所述主节点 立刻或者等到收到来自所述从节点的表示正在等待的响应后， 开始重新一轮的测距、 带宽分配以及重启。 本发明实施例还提供了一种节点，应用于二纤反向环网的光突发交换环网网络中； 所述节点包括控制信道处理模块、 数据信道接收模块、 数据信道发送模块， 以及保护 开关， 其中， 所述控制信道处理模块包括： 第一功率监测模块， 用于探测控制信道的光信号功率状况， 进行光电转换后， 将 控制帧输出给控制帧解析模块； 控制帧解析模块， 用于解析控制帧内容， 根据控制帧中所指示的带宽预留信息向 所述数据信道接收模块和所述数据信道发送模块下达相应的指令， 进行正常的数据帧 上下路； 根据本节点的处理情况， 并通知控制帧生成模块生成新的控制帧； 控制帧生成模块， 用于接收来自控制帧解析模块的通知或数据信道接收模块的故 障通知， 按照通知生成新的控制帧， 并将新的控制帧发送到控制帧发送模块； 控制帧发送模块， 用于将来自控制帧生成模块的新的控制帧发送到光纤线路上传 递给下游节点； 所述数据信道接收模块包括： 第二功率监测模块， 用于针对各个波长的监测， 将监测结果经由控制接口通知给 控制帧生成模块； 快速选择开关， 用于经由控制接口接收来自所述控制信道处理模块的控制帧， 根 据控制帧中包含的带宽预留信息，接收应在本地下路的 OB;接收到的 OB光信号经过 光电转换和本地电域缓存， 后发送到用户端； 如果所述节点收到的控制帧是指示节点进行保护倒换操作； 所述控制帧解析模块， 还用于完成控制帧解析后， 通知保护开关动作。 所述节点为主节点， 还包括故障判断模块和带宽分配模块， 其中， 故障判断模块， 用于收集本节点上的监测结果； 从来自所述控制信道处理模块中 的控制帧解析模块解析后的信息中， 获取网络中其它节点的光功率监测结果， 根据得 到的监测结果， 确定网络是否发生故障， 以及故障类型和故障位置， 并将得到的故障 结果输出给所述控制信道处理模块中的控制帧生成模块； 所述控制信道处理模块中的控制帧生成模块， 还用于接收来自所述带宽分配模块 的带宽分配结果并转换成相应的控制帧数据； 接收来自故障判断模块的故障结果， 根 据该故障结果生成相应的信令信息并填入控制帧， 并将新的控制帧发送到控制帧发送 模块。 本发明实施例还提供了一种光突发交换环网中实现自动保护倒换的***， 所述系 统为二纤反向环网的光突发交换环网 OBRing网络； 所述光突发交换环网中， 控制信道独占一个物理信道； 所述光突发交换环网中的 节点包括主节点和从节点； 所述各节点包括控制信道处理模块、 数据信道接收模块、 数据信道发送模块， 以 及倒换用的保护开关。 所述节点为主节点， 还包括故障判断模块和带宽分配模块。 本实施例提供的技术方案包括主节点和从节点分别对各自的信道进行光功率监 测， 并将监测结果汇集到主节点； 主节点根据监测结果确定发生故障时， 向从节点发 送倒换操作指令； 从节点即故障两端的相关节点进行倒换操作并进入保护工作状态。 通过本发明， 为光突发交换环网引入保护倒换机制， 实现了对故障的处理， 保证了光 突发交换环网通信质量。 进一步地， 本发明实施例提供的方法通过对数据信道和控制信道采用不同的倒换 操作， 即数据信道由双环拓扑倒换成双总线型拓扑， 而原双环控制信道倒换形成一个 大的单环， 从而既解决了 OBRing对控制信道环路的保护要求， 保证了控制信道依然 能够按照主从式的环网工作模式运作， 又顾全了数据信道上收发设备的利用率， 最大 限度地发挥了每个节点上收发设备的可用性。 附图说明 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部分， 本发 明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的不当限定。 在附图 中： 图 1为现有 OBRing子波长交换光网络及其节点结构示意图； 图 2为本发明光突发交换环网中实现自动保护倒换的方法的流程图； 图 3为本发明保护倒换动作实施例的示意图； 图 4(a)为本发明图 5所示实施例中保护倒换后的网络示意图； 图 4(b)为本发明图 5所示实施例中的网络图的等效网络示意图； 图 5为本发明 OBRing中从节点的内部逻辑组成结构示意图； 以及 图 6为本发明 OBRing中主节点的内部逻辑组成结构示意图。 具体实施方式 图 2为本发明光突发交换环网中实现自动保护倒换的方法的流程图，如图 2所示， 包括以下步骤： 步骤 200: 主节点和从节点分别对各自的信道进行光功率监测， 并将监测结果汇 集到主节点。 本步骤中， 主节点和各个从节点都分别对控制信道和数据信道的光功率状态 （也 称为光路状态） 进行实时监测。 其中， 从节点监测到的光路状态的监测结果可以携带 在控制帧或者新增设的故障汇报消息中， 并经由控制信道传送给主节点； 主节点上的 光路状态的监测结果包括自身对控制信道和数据信道的光功率状态进行实时监测的监 测结果， 以及各个从节点通过控制信道上报的监测结果。 步骤 201 : 主节点根据监测结果确定发生故障时， 向从节点发送倒换操作指令。 本发明方法可应用的 OBRing网络为二纤反向环网。 本步骤中， 主节点能确定的 故障主要针对单纤断路或者双纤断路造成的控制信道、 数据信道光纤环中断的情况。 本步骤中， 根据监测结果确定的会直接导致网络运作失常的故障可以包括： 当监测结 果显示为仅某一环上存在一个节点的控制信道、 数据信道均报告失光时， 故障结果为 单纤单点线路故障； 当监测结果显示为两个环上分别有一处节点 （位置相邻） 的控制 信道和数据信道均失光时， 故障结果为双纤单点线路故障； 当监测结果显示为仅某一 节点控制信道报告失光时， 故障结果为控制信道发射机故障； 当监测结果显示为两个 环上均发生控制帧接收失常时， 故障结果为非主节点的节点瘫痪 （如供电失效） 等。 这些故障下， 主节点会向从节点发送倒换操作指令。 另外， 需要说明的是， 如果根据监测结果确定仅仅有个别的数据信道波长故障， 不影响网络整体运作的情况下， 可以不需要进行本发明的保护倒换操作， 主节点只需 通知相关节点避开不可用的波长信道即可， 同时将情况上报给网管***。 当然， 对于 这种情况， 主节点也可以向从节点发送倒换操作指令。 步骤 202: 从节点进行倒换操作并进入保护工作状态。 本步骤之前还包括： 主节点向从节点下发包含倒换操作指令的控制帧， 该控制帧 沿途经过的各从节点比较控制帧内携带的节点标识 （ID) 信息与自身的 ID是否一致， 以便检查自身是否是故障点两端的节点（即故障端节点），如果二者不一致则表明不是 故障端节点， 那么该从节点直接进入保护工作状态， 并继续向下游转发该控制帧， 等 待主节点重新进行带宽分配； 如果二者一致则表明是故障端节点， 那么该从节点根据 倒换指令做出相应的开关切换操作。 如果节点采用光开关作为保护开关， 则此时只需 从正常工作状态时的平行 bar状态切换到交叉 cross状态，将内环与外环控制信道合并 到一起； 如果节点未采用光开关做倒换， 也可以直接在电域将准备要发往故障点的控 制信道信号调度到另一个环方向上， 即将原本独立的内、 外环控制信道合并成一个大 环。 如图 3所示， 假设图 3中节点 1为主节点， 故障为发生在从节点 3和从节点 4之 间的断纤。 这样， 如图 4(a)和图 4(b)所示， 原来两个独立的环形拓扑网络， 倒换后形 成两条直线型拓扑的网络， 此时的网络逻辑上可看作一个总共 2N个节点 （原来是 N 个节点） 的新网络， 而且这一新网络的特点是具有两条独立的直线拓扑的数据通道， 同时共用一个环形拓扑的控制通道。 完成以上过程后， 网络的每个节点都自动进入保护工作状态即保护模式， 原来的 双环双控制信道网络转变为， 主节点和各从节点在保护状态下共享一个控制信道。 此 时所有节点的收发工作与正常状态下并无区别， 都是根据控制帧中携带的带宽配置信 息进行 OB的收发。 区别仅在于， 正常工作状态下内环和外环分别有自己的环形控制 信道， 各个节点在两个环上独立地进行带宽分配； 而保护工作状态下， 各个节点只有 一个共享的环形控制信道， 用于同时传送包含两条总线形拓扑网络的带宽配置信息。 结合图 3、 图 4(a)和图 4(b)可见， 每个节点逻辑上可拆分成上节点和下节点， 分别 对应原来内环和外环上的收发设备，上节点从控制帧中提取属于上路的带宽配置信息， 并根据该带宽配置信息进行 OB收发， 下节点则从控制帧中提取属于下路的带宽配置 信息， 并根据该带宽配置信息进行 OB收发。 在倒换后的网络中， 数据通道由正常情 况下的反向双环拓扑， 变成了保护状态下的反向双总线拓扑， 而同时控制信道在两条 总线的两端相连通， 依然形成一个环形的通道。 也就是说， 相当于正常状态下的两个 环上的所有节点， 在保护状态下公用一个控制信道环。 通过本发明的保护倒换， 一方 面保证了控制信道依然能够按照主从式的环网工作模式运作， 另一方面也最大限度地 发挥了每个节点上收发设备的可用性。 需要说明的是， 在主节点处， 保护工作状态下， 带宽分配的算法与正常工作模式 下有所不同。 如图 4(a)和图 4(b)所示的实施例中， 主节点 1可以分为上主节点 1 (图 4(a)和图 4(b)中的 1上） 和下主节点 1 (图 4(a)和图 4(b)中的 1下） ， 控制帧流经上主 节点 1时， 下线的带宽请求信息能够全部汇集到主节点 1中， 根据带宽分配算法计算 出相应的带宽配置策略后填写到控制帧中， 当这一控制帧走到下线的第一个节点， 如 图 4(a)和图 4(b)中的 4下 （从节点 4) 时， 其中所携带的下线带宽分配策略开始生效； 相应地， 控制帧途径下主节点 1时， 也会提交上线节点的所有带宽请求， 并通过带宽 分配算法更新对应的上线带宽分配策略。 步骤 202还包括： 如果主节点恰好处于故障点一端， 则主节点自身也会执行倒换 操作， 切换保护开关并进入保护状态， 否则， 主节点直接进入保护工作状态。 步骤 202还包括： 各从节点向主节点反馈表示倒换操作成功的控制帧， 或者对应 于故障汇报消息的表示倒换操作成功的故障汇报响应消息。 本发明方法为光突发交换环网引入保护倒换机制， 实现了对故障的处理， 保证了 光突发交换环网通信质量。
OBRing的物理网络是基于无源光环路的，而在倒换操作完成之后， 由于数据通道 和控制信道物理拓扑有所变化， 因此， 为了满足 OBRing中控制帧长和数据帧长， 与 网络环长之间可能的某些约束关系， 本发明方法还进一步包括： 主节点进行测距， 并 根据测距结果进行环长微调以满足环长与帧长的整数倍约束关系。 需要说明的是， 测 距及环长微调的实现属于本领域技术人员公知常识， 其具体实现并不用于限定本发明 的保护范围， 因此这里不再赘述。 进一步地， 在测距即环长微调完成后， 网络可以恢复业务的正常传送， 此时， 每 个节点对于控制信道和数据信道的行为， 与正常双环工作状态时基本相同， 区别仅在 于主节点， 主节点需要根据分别来自两条总线的带宽请求进行带宽分配， 而两条总线 上的带宽分配结果同时在同一个控制信道中传送。 进一步地， 在故障修复后， 本发明方法还包括： 网络可以通过任意可行的方式， 比如通过网管***下达指令， 使得节点从保护工作状态恢复到正常双环工作状态。 具 体地： 主节点接收到来自网管***的指令后， 向控制信道上发送出携带有网络恢复 指示的控制帧， 该控制帧在所有途径节点处被处理和转发， 之后， 节点暂停所有 业务， 等待新一轮重启。 特别地， 故障段两端的节点收到该控制帧后， 在终止业 务发送的同时， 还进一步通过光开关将倒换处重新切换成双环工作的原始状态即 将光开关从 cross状态切换到正常工作状态时的 bar状态； 主节点发送完携带有网络恢复指示的控制帧后， 可以立刻或者等到收到来自 从节点的表示正在等待的响应后， 开始重新一轮的测距、 带宽分配， 以及重启。 之后网络恢复到正常的双环工作状态。 通过本发明上述方法， 解决了集中式控制的 OBRing网络没有合适的保护倒换机 制的问题， 为光突发交换环网引入保护倒换机制， 实现了对故障的处理， 保证了光突 发交换环网通信质量； 而且， 本发明方法通过对数据信道和控制信道采用不同的倒换 操作方式， 既解决了 OBRing对控制信道环路的保护要求， 保证了控制信道依然能够 按照主从式的环网工作模式运作， 又顾全了数据信道上收发设备的利用率， 最大限度 地发挥了每个节点上收发设备的可用性。 本发明方法是以图 1所示的 OBRing网络为基础的， 如图 1所示，至少包括以 下功能： 两个光纤环路 （为了形成保护， 两个环上的数据流向是相反的）， 一环用于工作， 一环用于保护。 特别地， 对于业务来说， 正常情况下只在一根光纤环中收发， 而另一 环用于保护低优先级业务也可只在保护环中收发； 控制信道独占一个物理信道： 每条光纤内按照波长资源划分物理信道， 控制信道 至少固定占用一个波长信道， 且控制信号时钟全都同步于主节点； 集中式带宽分配控制： 控制信道中传递的控制帧在经过每个节点时， 将本地的带 宽请求信息填写到控制帧中， 从而每个环周期都有所有的带宽请求信息汇集到主节点 上， 由主节点集中进行带宽分配， 并将分配结果填写到控制帧中， 在下一个环周期中 下达给各个节点； 节点分主从关系， 主节点负责全局调度， 包括执行带宽分配策略， 通过控制信道 协调各个节点之间的收发时序， 实现动态的子波长交换同时避免冲突竞争。 除此之外 主节点与从节点的物理结构上是一致的； 节点在两个环方向上配备有相同的整套收发设备， 其中都包括控制信道和数据信 道各自的处理模块；
OB包的长度在***运行过程中是固定值， 环长是 OB包长的整数倍； 网络中出现单点故障， 无论是节点故障还是断纤， 以及故障位置处于何处， 因为 双环拓扑的固有特性，所有节点都还可以至少有一个环方向上能与主节点连通，此时， 所有节点的收发设备都必须同步于主节点； 基于图 1所示的网络结构， 每个节点上有两条光纤通过， 从全网的角度看可以分 为一个内环一个外环， 两个环上的业务流向是相反的， 类似于弹性分组环网络中的 ringletO和 ringletl情形。 而且每个节点内部来看， 内环和外环上挂载的功能模块也都 是相同的， 只有业务流向的区别。 如图 1所示，对于任意一个环来说，进入节点后首先有一个解复用器（DEMUX)， 用于将控制信道和数据信道剥离开， 其中， 控制信号进入控制信道的处理模块进行电 域的逻辑处理， 而数据信道则继续在光域向前传送， 继而经过一定的光线延迟线， 再 通过耦合器将一部分信号能量耦合下路并传递给数据信道接收模块。 此外， 还有一个 波长选择开关， 用于参照控制信号的指示， 将控制信道的信号以及与本节点上路信号 相冲突的波长信号终结掉。 同时， 控制信道处理模块， 还用于控制数据信道的发送模 块， 将本地上路信号发送到相应的波长和 OB时隙上去； 同时， 控制信道处理模块还 用于将更新过的控制帧与上路的数据帧一起通过耦合器发送到光纤线路上去。 在节点的两侧线路出入端口处， 还需分别设置一个光开关。 光开关用于在正常网 络运行状态下，保持令外环和内环平行不交叉的状态，而在网络进入保护倒换模式时， 将内环和外环切到桥接的状态。 进一步地， 光开关可以选用具有波长选择能力的光开 关， 使得倒换时可以灵活地选择具体切换哪个波长到倒换状态。 具体地， 每个节点的内部逻辑组成结构如图 5所示， 包括控制信道处理模块、 数 据信道接收模块、 数据信道发送模块， 以及保护开关， 其中， 控制信道处理模块包括: 第一功率监测模块， 用于探测控制信道的光信号功率状况， 进行光电转换后， 将 控制帧输出给控制帧解析模块。 正常情况下， 控制信号应始终有稳定的光功率， 并可 以经过一个光电转换， 进入控制帧解析模块； 如果监测结果显示 "失光" （说明上游 节点的控制信道发射机故障或者也可能是上游节点与本节点之间发生了断纤） ， 就立 即将这一情况汇报给控制帧生成模块； 控制帧解析模块， 用于解析控制帧内容， 根据控制帧中所指示的带宽预留信息向 数据信道接收模块和数据信道发送模块下达相应的指令， 进行正常的数据帧上下路。 因为控制帧还需要继续向下游转发， 所以控制帧解析完成后一部分控制信息继续进入 控制帧生成模块， 以便生成新的控制帧。 如果节点收到的控制帧是指示节点进行保护 倒换操作， 完成控制帧解析后， 控制帧解析模块应通知保护开关做切换动作。 控制帧生成模块， 用于接收来自控制帧解析模块的信息或数据信道接收模块的故 障通知， 按照通知生成新的控制帧， 比如在控制帧的相应字段里填写相应故障特征， 并将新的控制帧发送到控制帧发送模块； 控制帧发送模块， 用于将来自控制帧生成模块的新的控制帧发送到光纤线路上传 递给下游节点。 控制帧发送模块物理上就是控制信道发射机。 光开关， 用于接收来自控制帧解析模块的动作通知， 执行切换操作。 数据信道接收模块包括： 第二功率监测模块， 用于针对各个波长的监测。 只要监测到某个或某些或者全部 波长的光功率丢失， 说明存在上游节点故障或者链路故障的可能， 这一信息将经由控 制接口通知给控制帧生成模块； 快速选择开关， 用于经由控制接口接收来自控制信道处理模块的控制帧， 根据控 制帧中包含的带宽预留信息，准确地接收应在本地下路的 OB。这些 OB光信号经过光 电转换和本地电域缓存， 继而被后续的其他上层模块接收最终发送到用户端去。其中， 本地电域缓存属于现有模块， 这里不再赘述。 数据信道发送模块， 用于根据控制帧中携带的带宽分配信息， 以 OB形式上路本 地业务数据。 特别地， 图 6为本发明 OBRing中主节点的内部逻辑组成结构示意图， 如图 6 所示， 作为主节点， 还用于负责全局的控制和调度， 因此， 在图 5所示的功能模块外， 主节点还包括故障判断模块和带宽分配模块， 其中， 故障判断模块， 用于收集本节点上的监测结果； 从来自控制帧解析模块解析后的 信息中， 获取网络中其它节点的光功率监测结果， 根据得到的监测结果， 确定网络是 否发生故障， 以及故障类型和故障位置， 并将得到的故障结果输出给控制帧生成模块; 控制帧生成模块， 处理具备图 5所示的功能外， 还用于接收来自带宽分配模块的 带宽分配结果并转换成相应的控制帧数据； 接收来自故障判断模块的故障结果， 根据 该故障结果生成相应的信令信息并填入控制帧， 并将新的控制帧发送到控制帧发送模 块。 其中， 对于保护倒换操作来说， 根据故障结果生成相应的信令信息包括下达倒换 指令、 测距指令以及***重启指令等。 下面结合具体实施例， 分别从普通节点和主节点的角度对本发明方法做进一步具 体描述。 对于普通节点来说， 每个节点都利用其光功率监测模块进行实时的功率监测。 控 制信道或数据信道上的功率监测无论哪一方出现 "失光"， 都可认认为是发现故障。理 论上如果只考虑单点故障，对于一个节点来说功率监测情况只可能出现如下几种情景： 两个环方向上的控制信道和数据信道都能检测到光 （或数据信道个别波长无光）； 或者， 某一环方向上控制信道上检测不到光， 数据信道上有光（或个别波长无光）， 而 另一环方向上都能检测到光； 或者， 某一环方向上的控制信道和数据信道同时检测不 到光。 根据上述监测结果， 以第一种情景， 即两个环方向上的控制信道和数据信道都能 检测到光 （或数据信道个别波长无光） 为例， 也就是说， 在上游节点的个别数据信道 波长的发射机可能有故障， 但只影响到一个节点的数据信道， 并不影响控制信道以及 网络其它节点的正常工作。 此时， 本节点只需正常地向控制帧中填写相应监测信息即 可； 根据上述监测结果， 以第二种情景， 即某一环方向上控制信道上检测不到光， 数 据信道上有光（或个别波长无光）， 而另一环方向上都能检测到光为例， 也就是说， 在 上游节点出现了控制信道故障，此时监测到此故障的节点无法收到上游传来的控制帧， 则应立即组装一个新的控制帧， 并在相应字段标示出故障结果， 从与主节点连通的环 方向上发送给主节点； 根据上述监测结果， 以第三种情景， 即某一环方向上的控制信道和数据信道同时 检测不到光为例， 也就是说， 在节点的一侧的光纤线路出现断纤情况， 可能是双纤断， 或者单纤断。 监测到该故障的节点同样立即组装一个新的控制帧并标识故障结果， 从 与主节点联通的方向上发给主节点。 进一步地， 基于上述节点故障监测结果， 普通节点在上述 3种情况下， 在将故障 结果信息通过控制信道传给主节点后， 主节点根据所有节点发来的信息综合判断， 并 决定是否发送包含具体倒换指令的控制帧。 具体地， 以图 3为例， 当节点 3和节点 4之间出现双纤断纤时， 节点 3上检测到 上述故障情景中的第三种情景， 比如外环控制信道和数据信道同时无光， 而内环还都 能监测到光； 节点 4上也会监测到上述故障情景中的第三种情景， 表现为内环控制信 道和数据信道同时无光， 而外环还能检测到光。 此时， 节点 3和节点 4立即将各自监测到的故障结果发送给主节点 1。 其中， 节 点 3通过内环与主节点相连的控制信道获取同步时钟， 控制帧则是通过外环控制信道 发送给主节点 1， 而节点 4与之相反， 通过外环控制信道获取主节点的时钟同步， 而 经由内环控制通道向主节点 1发送故障结果。 主节点 1在一个环周期内， 同时收到来自节点 3和节点 4的故障结果信息后， 经 由故障判断模块判断， 生成指示倒换操作的控制帧， 分别从两个方向的控制通道下发 出去。 当环上的从节点收到来自主节点 1的包含倒换指令的控制帧， 则首先判断是否自 身是故障点两端的节点， 如果不是故障端节点， 则直接进入保护状态， 并等待主节点 重新进行带宽分配； 如果自身是故障端节点， 则根据倒换指令做出相应的光开关切换 操作， 如图 3中， 节点 3和节点 4作为故障端节点， 将执行光开关切换， 而节点 1和 节点 2并非故障端节点， 则直接进入保护状态。 进一步地， 完成上述切换操作， 节点进入保护工作状态后， 各从节点可以向主节 点 1发送一个表示操作成功的控制帧， 而主节点确认所有节点已经准备好之后， 开始 重新对网络测距。 进一步地， 测距完成后， 主节点 1发送正常的带宽分配控制帧， 使网络中的各节 点开始在控制信道统一调度下正常进行 OB收发。 进一步地， 工作于保护状态的网络， 直到故障消除， 网管下达复原指令后， 主节 点 1从控制信道下发包含复原指令的控制帧， 这样， 对于普通节点来说， 收到包含复 原指令的控制帧意味着退出保护状态， 恢复正常工作状态， 并等待主节点新一轮的带 宽分配启动。 对于主节点， 故障判断模块周期性地检查其所收集到的故障结果信息， 当判断模 块判断出为需要进行倒换操作的故障 （包括单 /双纤单点断纤， 控制信道故障， 节点瘫 痪等） 时， 生成控制帧并在其中携带倒换指令。 主节点在确定出故障的同时， 还要进 一步判断故障的位置。 判断方式可以有很多种， 这里并不做限定， 举例来讲， 比如根 据某一环方向上故障汇报节点的 ID， 如果从 ID为 n的节点开始， 其下游节点都汇报 了故障信息， 则可判断出节点 n为紧邻故障点的下游节点， 另一环方向同理。 这样， 综合两个环方向上的判断， 即可以确定出两个故障端节点。 如果此时主节点恰好处于 故障点一端， 则主节点自身也会执行倒换操作， 切换光开关并进入保护状态， 否则， 主节点直接进入保护工作状态。 进一步地， 主节点可选地等待所有节点返回倒换成功 的反馈信息控制帧， 或者为了节约信令时间而默认所有节点已进入保护状态， 进行网 络测距。 测距结束后， 主节点开始发送带宽分配控制帧和进行正常的收发 OB， 直到 故障消除网管下达复原命令后， 主节点再向网络中的各节点发出包含复原指令的控制 帧， 使网络退出保护工作状态， 重新开始正常的双环工作状态。 以上所述， 仅为本发明的较佳实例而已， 并非用于限定本发明的保护范围。 凡在 本发明的精神和原则之内， 所做的任何修改、 等同替换、 改进等， 均应包含在本发明 的保护范围之内。

Claims

权 利 要 求 书 、 一种光突发交换环网中实现自动保护倒换的方法， 包括： 主节点和从节点分别 对各自的信道进行光功率监测， 并将监测结果汇集到主节点；
主节点根据监测结果确定发生故障时， 向从节点发送倒换操作指令； 从节点进行倒换操作并进入保护工作状态。 、 根据权利要求 1所述的方法， 其中， 所述光功率监测包括对控制信道和数据信 道的光功率状态进行实时监测。 、 根据权利要求 2所述的方法， 其中， 所述将监测结果汇集到主节点包括： 所述从节点将监测到的监测结果携带在控制帧，或者新增故障汇报消息中， 并经由控制信道传送给主节点； 所述主节点的监测结果包括自身对控制信道和数据信道的光功率状态进行 实时监测的监测结果， 以及各个从节点通过控制信道上报的监测结果。 、 根据权利要求 2所述的方法， 其中， 所述根据监测结果确定发生故障包括： 当所述监测结果显示为仅某一环上存在一个节点的控制信道、 数据信道均 报告失光时， 故障结果为单纤单点线路故障；
当所述监测结果显示为两个环上分别有一处节点 （位置相邻） 的控制信道 和数据信道均失光时， 故障结果为双纤单点线路故障；
当所述监测结果显示为仅某一节点控制信道报告失光时， 故障结果为控制 信道发射机故障；
当所述监测结果显示为两个环上均发生控制帧接收失常时， 故障结果为非 主节点的节点瘫痪。 、 根据权利要求 4所述的方法， 其中， 当所述故障结果存在个别数据信道波长故 障， 不影响网络整体运作的情况时， 该方法还包括： 所述主节点通知相关节点避开不可用的波长信道， 同时将情况上报给网管 ***。 、 根据权利要求 3所述的方法， 其中， 该方法还包括： 所述各从节点向主节点反 馈表示倒换操作成功的控制帧； 或者， 反馈对应于所述故障汇报消息的表示倒换操作成功的故障汇报响应 消息。 、 根据权利要求 1所述的方法， 其中， 如果所述主节点处于故障点一端， 该方法 还包括： 所述主节点自身执行倒换操作， 切换保护开关并进入保护状态； 否则， 所述主节点直接进入保护工作状态。 、 根据权利要求 7所述的方法， 其中， 所述从节点进行倒换操作之前， 该方法还 包括： 从节点接收到倒换操作指令后， 判断自身是否是故障点两端的节点： 如果判断出不是故障端节点， 则直接进入保护工作状态， 并等待所述主节 点重新进行带宽分配；
如果判断出是故障端节点， 则根据倒换操作指令， 进行保护开关切换操作 后进入保护工作状态。 、 根据权利要求 8所述的方法， 其中， 所述保护开关切换操作包括： 将光开关从 正常工作状态时的平行 bar状态切换到交叉 cross状态； 或者， 在电域上将控制信道从一个环转调度到另一环上。 0、 根据权利要求 7或 9所述的方法， 其中， 所述进入保护工作状态后， 该方法还 包括： 所述主节点和各从节点的所有收发设备共享一个控制信道； 所述各节点逻辑上拆分成上节点和下节点， 分别对应原来内环和外环上的 收发设备； 其中， 上节点从控制帧中提取属于上路的带宽配置信息， 并根据该 带宽配置信息进行 OB收发， 下节点则从控制帧中提取属于下路的带宽配置信 息， 并根据该带宽配置信息进行 OB收发。 1、 根据权利要求 10所述的方法， 其中， 所述主节点分为上主节点和下主节点， 该 方法还包括：
所述控制帧流经上主节点时， 下线的带宽请求信息全部汇集到所述上主节 点中， 所述上主节点根据带宽分配算法计算出相应的带宽配置策略后填写到控 制帧中， 当这一控制帧流经下线的第一个节点时， 其中所携带的下线带宽分配 策略开始生效；
相应地， 所述控制帧途径下主节点时， 提交上线节点的所有带宽请求， 并 通过带宽分配算法更新对应的上线带宽分配策略。 、 根据权利要求 1所述的方法， 其中， 该方法还包括： 所述主节点进行测距， 并 根据测距结果进行环长微调。 、 根据权利要求 12所述的方法， 其中， 该方法还包括： 在所述主节点和各从节点 上恢复业务的正常传送。 、 根据权利要求 13所述的方法， 其中， 在故障修复后， 该方法还包括： 网络通过 网管***下达指令， 通知所述主节点和各从节点从保护工作状态恢复到正常双 环工作状态。 、 根据权利要求 14所述的方法， 其中， 所述恢复到正常双环工作状态包括： 所述主节点接收到来自网管***的指令后， 向控制信道上发送出携带有网 络恢复指示的控制帧， 该控制帧在所有途径节点处被处理和转发；
所述途径节点暂停所有业务， 等待新一轮重启， 同时，
所述故障段两端的节点在终止业务发送时， 还将光开关从 cross状态切换 到正常工作状态时的 bar状态， 或者， 停止控制信道在电域上的跨环转发， 恢 复到正常工作状态。 、 根据权利要求 15所述的方法，其中，所述主节点发送完携带有网络恢复指示的 控制帧后， 该方法还包括： 所述主节点立刻或者等到收到来自所述从节点的表 示正在等待的响应后， 开始重新一轮的测距、 带宽分配以及重启。 、 一种节点， 应用于二纤反向环网的光突发交换环网网络中； 所述节点包括控制 信道处理模块、数据信道接收模块、 数据信道发送模块， 以及保护开关， 其中， 所述控制信道处理模块包括：
第一功率监测模块， 用于探测控制信道的光信号功率状况， 进行光电转换 后， 将控制帧输出给控制帧解析模块； 控制帧解析模块， 用于解析控制帧内容， 根据控制帧中所指示的带宽预留 信息向所述数据信道接收模块和所述数据信道发送模块下达相应的指令， 进行 正常的数据帧上下路； 根据本节点的处理情况， 并通知控制帧生成模块生成新 的控制帧； 控制帧生成模块， 用于接收来自控制帧解析模块的通知或数据信道接收模 块的故障通知， 按照通知生成新的控制帧， 并将新的控制帧发送到控制帧发送 模块； 控制帧发送模块， 用于将来自控制帧生成模块的新的控制帧发送到光纤线 路上传递给下游节点； 所述数据信道接收模块包括：
第二功率监测模块， 用于针对各个波长的监测， 将监测结果经由控制接口 通知给控制帧生成模块； 快速选择开关， 用于经由控制接口接收来自所述控制信道处理模块的控制 帧， 根据控制帧中包含的带宽预留信息， 接收应在本地下路的 OB; 接收到的 OB光信号经过光电转换和本地电域缓存， 后发送到用户端。 、 根据权利要求 17所述的节点，其中，如果所述节点收到的控制帧是指示节点进 行保护倒换操作；
所述控制帧解析模块， 还用于完成控制帧解析后， 通知保护开关动作。 、 根据权利要求 17或 18所述的节点， 其中， 所述节点为主节点， 还包括故障判 断模块和带宽分配模块， 其中，
故障判断模块， 设置为收集本节点上的监测结果； 从来自所述控制信道处 理模块中的控制帧解析模块解析后的信息中， 获取网络中其它节点的光功率监 测结果， 根据得到的监测结果， 确定网络是否发生故障， 以及故障类型和故障 位置，并将得到的故障结果输出给所述控制信道处理模块中的控制帧生成模块; 所述控制信道处理模块中的控制帧生成模块， 还设置为接收来自所述带宽 分配模块的带宽分配结果并转换成相应的控制帧数据； 接收来自故障判断模块 的故障结果， 根据该故障结果生成相应的信令信息并填入控制帧， 并将新的控 制帧发送到控制帧发送模块。 、 一种光突发交换环网中实现自动保护倒换的***， 所述***为二纤反向环网的 光突发交换环网 OBRing网络； 所述光突发交换环网中， 控制信道独占一个物理信道； 所述光突发交换环 网中的节点包括主节点和从节点；
所述各节点包括控制信道处理模块、 数据信道接收模块、 数据信道发送模 块， 以及倒换用的保护开关。 、 根据权利要求 20所述的***， 其中， 所述节点为主节点， 还包括故障判断模块 和带宽分配模块。
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