WO2010048813A1 - 线路环保护方法、系统和设备 - Google Patents
线路环保护方法、系统和设备 Download PDFInfo
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- WO2010048813A1 WO2010048813A1 PCT/CN2009/072260 CN2009072260W WO2010048813A1 WO 2010048813 A1 WO2010048813 A1 WO 2010048813A1 CN 2009072260 W CN2009072260 W CN 2009072260W WO 2010048813 A1 WO2010048813 A1 WO 2010048813A1
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- Prior art keywords
- bandwidth
- line
- protection
- bridging
- bandwidth map
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Classifications
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- 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
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
Definitions
- the present invention relates to the field of communications technologies, and in particular, to a line loop protection method, system, and device. Background technique
- the transport network implements the transmission of the tributary user signals through a multiplexing mechanism.
- a transport network consists of a series of physically interconnected network elements. The physical connections between network elements are called sections or lines. The path of a particular tributary signal from the end to the end through the transport network is called a path. ).
- SDH Serial Digital Hierarchy
- VC-N Virtual Container
- POH Path Overhead
- Self-healing network is a concept to improve the survivability of the network. Its meaning is: The network can automatically recover the carried service from the failed fault in a very short time without human intervention, so that the user does not feel that the network has been out. The fault.
- MSP Multiple Section Protection
- the multiplex section ring protection means that a series of protocol handshake processes are performed by using K bytes in the SDH section overhead, and APS (Automatic Protection) is performed. Switching, automatic protection switching), making The service signal originally transmitted on the damaged fiber is transferred to the protection route for transmission.
- the direction of the transmission on the protection route is generally the reverse direction of the faulty route on the ring, so that the original service continues to be transmitted without interruption. Due to the short service interruption time, the multiplex section ring protection can automatically recover services within 50ms, the protection channels can be shared, and the network capacity is high, so more and more applications are obtained.
- multiplex section ring protection is mainly divided into two types: two-fiber and four-fiber.
- the two fiber loops indicate that the NEs are connected by two fibers with opposite transmission and reception directions.
- the four fiber loops indicate that the NEs are connected by four fibers.
- the pair of transceiver fibers are working channels, and the other pair of transceiver fibers are protection channels.
- only the two fiber loops are taken as an example to illustrate the circuit ring protection method in the prior art.
- the two-fiber multiplexed line ring protection is divided into two types: one-way and two-way.
- one fiber works as the other, and the other fiber acts as a protection. All protected services are sent and received on the working fiber.
- the two-way two-fiber ring the first half of each fiber is working, and the second half is working.
- the channel is a protection channel.
- the two types of the two-fiber ring are the same in the protection protocol. The following is a description of the multiplexed ring protection method in the prior art.
- the network scenario shown in FIG. 1A includes four network elements A/B/C/D.
- the network element B first detects the fault and reports the SF (Signal Fail) to the protocol module of the local network element B.
- the network element B sends a long-path ring bridging request and a short-path ring bridging request to the faulty neighboring network element A by using the K-byte, wherein the short-path ring bridging request directly reaches the network element A, and the long-path ring bridging request passes through the network element.
- C and network element D arrive at the network element.
- the network element A After receiving the short-path ring bridging request of the network element B, the network element A sends a long-path ring bridging request to the network element B and sends a short-path ring bridging request confirmation to the network element B. After detecting the long-path ring bridge request sent by network element B to network element A, network element C and network element D enter the punch-through state. After receiving the long-path ring bridging request of the network element B, the network element A generates a bridge switching, and sends a long-path ring bridge request confirmation to the network element B. The long-path ring bridge confirmation will pass through the network element C and the network element D to reach the network element B. .
- the network element B After receiving the long-path ring bridging request and the short-path ring bridging request acknowledgement sent by the network element A, the network element B performs bridging and switching, and the protection switching process ends. It can be seen that in the existing multiplex section ring protection method, a complex ring protection protocol exists in each network element on the ring, and each network element needs to know the full ring topology. Once the ring topology changes, all network elements need to update the ring topology. Therefore, the complexity of the functions of each node in the network and the network maintenance cost are increased. Summary of the invention
- Embodiments of the present invention provide a line loop protection method, system, and device for reducing the complexity of network functions and network maintenance costs in a network while implementing line loop protection.
- Embodiments of the present invention provide a line ring protection method, including:
- An embodiment of the present invention further provides a master node device in a line ring, including:
- a fault notification receiving unit configured to receive a line fault notification
- a bandwidth allocation unit configured to update a bandwidth map to allocate protection bandwidth in the line ring to services in the protected working bandwidth
- a bandwidth map sending unit configured to send the updated bandwidth map
- a bridging request sending unit configured to send a bridging request after the bandwidth map sending unit sends the updated bandwidth map.
- the embodiment of the invention further provides a slave node device in a line ring, including:
- the fault detecting unit is configured to detect a line fault, and when the fault occurs, the sending line fault is notified;
- the bridging request processing unit is configured to receive a bridging request, perform a bridging operation, and perform a switching operation.
- Embodiments of the present invention also provide a line loop protection system, including: At least one slave node device, configured to detect a line fault, send a line fault notification to the master node device when the fault occurs, and perform a bridge operation and a switch operation when receiving the bridge request sent by the master node device;
- the master node device when receiving the line fault notification sent by the slave node device, updates the bandwidth map to allocate the protection bandwidth in the line ring to the service in the protected working bandwidth; and sends a bridge request to the slave node device.
- the management and control functions of the network are centralized through the primary node, and the bridging and switching of the slave nodes are controlled, thereby saving the complexity of the functions of the nodes in the network and the network maintenance cost. . DRAWINGS
- FIG. 1A is a schematic diagram of a network scenario of a line ring protection in the prior art
- 1B is a flow chart of a method for protecting a line loop in the prior art
- FIG. 2 is a flow chart of a method for protecting a line loop in an embodiment of the present invention
- FIG. 3A is a schematic diagram of a two-fiber bidirectional line protection switching in the embodiment of the present invention
- FIG. 3B is a bandwidth map before the two-fiber bidirectional line protection switching in the embodiment of the present invention
- FIG. 4A is a second fiber in the embodiment of the present invention
- 2B is a schematic diagram of a bandwidth map after two-fiber bidirectional line protection switching in the embodiment of the present invention
- FIG. 5 is a flowchart of a two-fiber bidirectional line protection switching in the embodiment of the present invention
- FIG. 6 is a flowchart of a method for recovering a two-fiber bidirectional line in an embodiment of the present invention
- FIG. 7A is a schematic diagram of a two-fiber one-way line protection switching before the embodiment of the present invention
- 7B is a bandwidth map before the protection of the two-fiber unidirectional line protection in the embodiment of the present invention
- FIG. 8A is a schematic diagram of the protection of the two-fiber unidirectional line protection after the embodiment of the present invention
- FIG. 8B is a bandwidth map of a two-fiber unidirectional line protection switching in an embodiment of the present invention
- FIG. 9 is a schematic structural diagram of a master node device in an embodiment of the present invention.
- FIG. 10 is another schematic structural diagram of a master node device in an embodiment of the present invention.
- FIG. 11 is a schematic structural diagram of a slave node device in an embodiment of the present invention. detailed description
- the nodes can be divided into two types: N-nodes and S-nodes.
- the N-nodes are ordinary distributed service access nodes.
- the S-nodes are still The node that interfaces with the upper network.
- An N node can also be called a slave node, and an S node can also be called a master node.
- Any node can directly transmit traditional TDM (Time Division Multiplex) and Ethernet data services, and can also provide PON (Passive Optical Network) tributary interface, which is also provided at the S node.
- Uplink service interfaces such as 10GE.
- the service type of the network can be three types: (1) FB (Fixed Bandwidth) service, which is mainly used to carry bandwidth delay guarantee services, such as TDM, SDH/SONET (Synchronous Optical Network) (2) AB (Assured Bandwidth) services, such as video, VOIP (Voice IP, voice IP), leased line, etc.; (2) BE (Best Effort, best-effort) services, such as Ordinary Internet services, etc.
- FB Fixed Bandwidth
- AB sured Bandwidth
- VOIP Voice IP, voice IP
- BE Best Effort, best-effort services
- the network is a converged network
- the aggregation node is an S node, which implements dual backup.
- the network is a A peer-to-peer switching network that can pass TDM, SDH/SONET, and private lines from any node.
- DBA Dynamic Bandwidth Assignment
- the statistics request and the bandwidth request information of each service port in the local node are reported to the host.
- the host performs judgment and calculation based on the existing bandwidth resources, service type and priority of each node, and finally allocates bandwidth of each node.
- Information is sent to each node, and each node transmits data according to the allocated bandwidth.
- the bandwidth allocation information sent to each node here is mainly a bandwidth map (BWmap).
- a line ring protection method is provided, which is applied to a network including a master node and a slave node, as shown in FIG. 2, including:
- Step s201 Receive a line fault notification.
- the slave node sends a line fault notification to the master node after detecting the line fault, and the master node receives the line fault notification.
- Step s202 Update the bandwidth map to allocate the protection bandwidth in the line ring to the service in the protected working bandwidth.
- Step s203 Send an update bandwidth map.
- the master node sends the updated bandwidth map to the slave node, so that the slave node updates the bandwidth map.
- the specific step of updating is to overwrite the previously saved bandwidth map with the newly received bandwidth map.
- Step s204 Send a bridge request.
- the master node After sending the updated bandwidth map to the slave node, the master node sends a bridge request to the slave node, thereby triggering bridging and switching operations of the slave node to protect the services in the line ring.
- the management and control functions of the network are implemented centrally by the master node, and the bridging and switching of the slave nodes are controlled, thereby saving the complexity of the functions of the nodes in the network and the network maintenance cost.
- a line loop protection method in an embodiment of the present invention is described by taking a two-fiber bidirectional line that is centrally controlled as an example.
- FIG. 3A it is a schematic diagram before the switching of the two-fiber bidirectional line protection, where the Node-S is the master node. Node-l, Node-2, and Node-3 are slave nodes. Under normal circumstances, each fiber has half the capacity as the working bandwidth and the other half as the protection bandwidth.
- the protection bandwidth of each fiber protects the operating bandwidth of the other fiber.
- the protected service is carried within the working bandwidth of each fiber, and additional services can be carried within the protection bandwidth of each fiber.
- a bandwidth map before the two-fiber bidirectional line protection switching can be as shown in FIG. 3B.
- the working bandwidth (as shown in the outer ring optical fiber W in FIG. 3B) carries protected services such as FB and AB, and protects the bandwidth ( The area shown by the outer ring fiber P in Fig. 3B can carry additional services such as BE.
- the working bandwidth (as shown in the inner ring fiber W in Figure 3B) carries the protected services such as FB and AB, and the protection bandwidth (as shown in the inner ring fiber P in Figure 3B) can carry additional services such as BE. .
- the line ring protection method in the embodiment of the present invention is as shown in FIG. 5, and includes:
- Step s501 The Node-2 detects the SF, and notifies the SF to the primary network element Node-S by using K bytes according to the ring topology.
- Step s502 The Node-S receives the SF sent by the Node-2.
- Step s503 The Node-S updates the bandwidth map and sends it to each slave node.
- the Node-S updates the bandwidth map by using the DBA function.
- the DBA function replaces the protected area bandwidth map with the working area bandwidth map in the other direction of the Node-S, and replaces the eastward protected area bandwidth map with the westbound working area bandwidth map, and the west facing protected area.
- the bandwidth map is replaced with an eastbound workspace bandwidth map.
- the bandwidth map after the switching is shown in Figure 4B.
- the east-west direction is defined as: From the position of the network element to the outside of the ring network, the network direction on the left side of the network element is referred to as the west direction, and the network direction on the right side is referred to as the east direction.
- the Node-S can send a bandwidth map to each slave node through overhead on the line. After the bandwidth map of the master node and each slave node is replaced, the extra services on the protection channel are suppressed, and each slave node implements punch-through. Step s504: The Node-S sends a bridging request to the Node-2 and the Node-3 respectively. Specifically, after the replaced bandwidth map is updated in the full ring, the Node-S passes the K byte to the Node-2 and the Node according to the ring topology. -3 sends a bridge request separately.
- the s505, the Node-2, and the Node-3 After receiving the bridge request sent by the Node-S, the s505, the Node-2, and the Node-3 perform the bridging operation and the switching operation respectively.
- the Node-2 and the Node-3 when performing the bridging operation, send the work area data sent by the network element west (or east) to the port according to the bridging request to the east (or west) of the other optical fiber to the port protection area. .
- Node-2 sends the working area data sent by the westbound port 2-1 of the inner ring fiber to the outer ring fiber to the protected area of the port 2-2.
- the switchover operation is performed, the received service data in the working bandwidth is collected through the protection bandwidth of the other fiber. Taking the switching operation performed by Node-2 as an example, as shown in FIG.
- Node-2 passes the work area service data previously received from port 2-4 of the outer ring fiber through the protection area of port 2-3 in the inner ring fiber. Charged.
- the order of execution of the bridging operation and the switching operation in the embodiment of the present invention is not limited.
- Step s506 after performing the bridging operation and the switching operation, Node-2 and Node-3 respectively pass
- the K byte sends a bridge acknowledgement to the Node-S.
- Step s507 After the Node-S receives the bridge confirmation of the Node-2 and the Node-3, the switching is completed.
- the data transmission direction in the two-fiber bidirectional line ring after the completion of the switching is shown in the direction indicated by the black arrow in Figure 4B.
- the method for recovering the line loop in the embodiment of the present invention is as shown in FIG. 6 when the optical fiber between the Node-2 and the Node-3 is recovered from the fault, and includes:
- Step s601 The Node-2 detects the SF clearing, and notifies the primary network element Node-S of the SF clearing by K bytes according to the ring topology.
- Step s602 The Node-S receives the SF clear sent by the Node-2.
- step s603 the Node-S enters the WTR to wait.
- step s604 After the WTR ends, the Node-S sends a cancel bridging request to the Node-2 and the Node-3 respectively through the K bytes.
- Steps s605, Node-2, and Node-3 cancel the respective bridging and switching operations after receiving the cancel bridging request sent by the Node-S.
- Steps s606, Node-2, and Node-3 respectively send a cancel bridge acknowledgement to the Node-S through K bytes.
- Step s607 After receiving the cancel bridge confirmation of Node-2 and Node-3, the Node-S passes the
- the DBA function restores the normal bandwidth map and sends it to each slave node, replacing the protected area bandwidth map with the bandwidth map before the switchover.
- the extra business is suppressed and the network is restored to normal.
- a line loop protection method in an embodiment of the present invention is described by taking a two-fiber unidirectional line that is centrally controlled as an example.
- FIG. 7A it is a schematic diagram before the switching of the two-fiber unidirectional line protection, where the Node-S is the master node. Under normal circumstances, the protected service only sends and receives on the working fiber, and can carry additional services such as BE on the protection fiber.
- the bandwidth map on the working and protection fibers can be different.
- the bandwidth map before the two-fiber unidirectional line protection switching can be as shown in Figure 7B.
- the line ring protection process of the two-fiber unidirectional line is similar to the process of the two-fiber two-way line protection in the previous embodiment.
- the main network element is used to centrally control the protection of the relevant instruction.
- the data sent by the node working port is changed to be dual-issued by the working port and the protection port.
- the slave node performs the switching operation, the received service data of the working port is collected through the corresponding protection port.
- the two-fiber unidirectional line protection ring bridges the data of the entire working fiber to the protection fiber, instead of bridging only half of the fiber capacity of the working bandwidth like the two-fiber two-way line protection ring.
- the network diagram and the bandwidth map after the completion of the switching are as shown in FIG. 8A and FIG. 8B. The specific process is not described in detail in this embodiment. For reference, refer to the description in the previous embodiment.
- a two-fiber ring is taken as an example to describe a specific implementation manner of the circuit ring protection method.
- the processing manner is similar to that of the two-fiber ring, and is not described in detail herein.
- the two fibers mentioned in the embodiments of the present invention may also represent a pair of wavelengths that are opposite in the transmission direction on different physical fibers, and are also applicable to the four-fiber ring.
- the management and control functions of the network are implemented centrally by the primary node, and the bridging and switching of the nodes are controlled, thereby saving the complexity of the functions of the nodes in the network and the network maintenance cost. This is because, for existing multi-service transport networks based on dynamic bandwidth adjustment, the functions required on the slave nodes are as simple as possible to reduce the network maintenance cost, so the existing multiplex section ring protection mechanism is not applicable to such networks.
- functions such as management and control of the network are collectively controlled by the primary node. Through the centralized control ring protection protocol of the primary NE, the network element only needs to retain a simple protection function.
- Embodiments of the present invention also provide a line loop protection system, including:
- At least one slave node device configured to send a line fault notification to the master node device when detecting a line fault, and perform a bridging and switching operation on the bridge ring when receiving the bridge request sent by the master node device Business protection;
- a master node device configured to receive a line fault notification sent from the node device, update the bandwidth map to allocate the protection bandwidth in the line ring to the service in the protected working bandwidth; and send a bridge request to the slave node device to the line The business in the ring is protected.
- the slave node device is further configured to send a line fault clearing notification to the master node device when detecting the line fault clearing, and cancel the bridge and switch operation and send the cancel bridge acknowledgement when receiving the cancel bridge request sent by the master node device.
- the master node device is further configured to: when receiving the line fault clearing notification sent by the slave node device, send a cancel bridge request to the slave node, and when receiving the cancel bridge acknowledgement of the slave node, replace the protected area bandwidth map with the bandwidth map before the switching To restore the network to the state before the failure occurred.
- the embodiment of the present invention further provides a master node device 10 in a line ring. As shown in FIG. 9, the method includes:
- the failure notification receiving unit 11 is configured to receive a line failure notification.
- the bandwidth allocation unit 12 is configured to update the bandwidth map to allocate the protection bandwidth in the line ring to the service in the protected working bandwidth.
- the bandwidth map transmitting unit 13 is configured to send an updated bandwidth map.
- the bridging request sending unit 14 is configured to: after the bandwidth map sending unit 13 sends the updated bandwidth map, send a bridging request, trigger a bridging and switching operation of the slave node to protect the service in the line ring.
- the master node device 10 further includes: a fault clearing notification receiving unit 15 configured to receive a line fault clearing notification;
- the cancel bridging request sending unit 16 is configured to send a cancel bridging request, and trigger the slave node to cancel the bridging and switching operation;
- the bandwidth recovery unit 17 for receiving the cancel bridge acknowledgement, replaces the protected area bandwidth map with the bandwidth map before the switching, and transmits to restore the network to the state before the failure occurs.
- the foregoing bandwidth management unit 12 may specifically include:
- the bandwidth map update sub-unit 121 is configured to update the bandwidth map by using the DBA function, that is, replace the bandwidth map of the protection area in the line ring with the bandwidth map of the protected work area;
- the service allocation sub-unit 122 is configured to update the bandwidth map in the line ring according to the updated bandwidth map of the bandwidth map sub-unit 121 to the service in the protected working bandwidth.
- the management and control functions of the network are implemented centrally by the master node, and the bridging and switching of the slave nodes are controlled, thereby saving the complexity of the functions of the nodes in the network and the network maintenance cost.
- an embodiment of the present invention further provides a slave node device 20 in a line ring, including:
- the fault detecting unit 21 is configured to detect a line fault, and when the fault occurs, the sending line fault is notified;
- the bridging request processing unit 22 is configured to receive a bridging request, perform a bridging operation, and perform a switching operation.
- the fault detecting unit 21 is further configured to: when detecting a line fault clearing, send a line fault clearing notification;
- the bridging request processing unit 22 is further configured to: when receiving the cancel bridging request, cancel the bridging operation and the switching operation and send the cancel bridging acknowledgement.
- the slave node processing is greatly simplified relative to the current MSP multiplex section node, and only the fault condition of the line is reported and the switching bridging operation is performed, and the complex ring protection protocol does not need to be run on the node, and Know the full ring topology.
- the present invention can be implemented by hardware or by software plus a necessary general hardware platform.
- the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several The instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.
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Description
路环保护方法、 系统和设备 本申请要求申请日为 2008年 10月 27日, 申请号为 200810171964.7, 发 明名称为"线路环保护方法、 系统和设备"的中国专利申请的优先权, 其全部 内容通过引用结合在本申请中。 技术领域
本发明涉及通信技术领域, 尤其涉及一种线路环保护方法、 系统和设 备。 背景技术
传送网络通过多路复用机制实现对支路用户信号的传输。 一个传送网络 包括一系列物理上互连的网元, 网元间的物理连接称为段 (Section ) 或线 路, 而一条特定的支路信号从端到端通过传送网络的路径称为通道 (Path ) 。 在 SDH (Synchronous Digital Hierarchy, 同步数字系列) 中, 一 个通道由一个 VC-N (Virtual Container, 虚容器) 和与其关联的 POH (Path Overhead, 通道开销) 表示, 一旦建立后, 通道的大小及位置都不会发生变 化。 一个段由一个 STM-N ( Synchronous Transmission Model, 同步传送模 块) 式的整个传输帧和它对应的 SOH (Section Overhead, 段开销) 表示。
现代社会对通信的依赖性越来越大, 传输网络的生存性即故障网络的即 时恢复显得至关重要。 自愈网是一种提高网络生存性的概念, 其含义在于: 网络就无需人为干预就能在极短的时间内从失效的故障中自动恢复所携带的 业务, 使用户感觉不到网络已出了故障。
MSP (Multiplex Section Protection, 复用段环保护) 是一种实现自愈网 的方式, 复用段环保护是指借助 SDH段开销中的 K字节完成一系列协议握 手过程, 进行 APS (Automatic Protection Switching, 自动保护倒换) , 使得
原先在受损光纤上传输的业务信号转移到保护路由上进行传递, 在保护路由 上传递的方向一般是环上故障路由的反方向, 从而使得原先的业务继续进行 传送而不至于中断。 复用段环保护由于业务中断时间短, 可以做到在 50ms 内自动恢复业务, 保护通道可共享, 网络容量高, 因而得到越来越多的应 用。
在 SDH应用中, 复用段环保护主要分为二纤和四纤两种。 其中二纤环 表示网元间通过两根收发方向相反的光纤相连; 而四纤环表示网元间通过四 根光纤相连, 一对收发光纤为工作通道,另一对收发光纤为保护通道。 此处只 以两纤环为例说明现有技术中的线路环保护方法。
二纤复用线路环保护又分为单向和双向两类。 对于单向二纤环, 一根光 纤作为工作, 另一根光纤作为保护, 所有被保护的业务都在工作纤上收发; 对于双向二纤环, 每根光纤的前一半通道为工作, 后一半通道为保护通道。 由于这两种二纤环在保护协议方式上也相同, 以下只以双向二纤环为例说明 现有技术中复用段环保护方法的具体实现。
如图 1A所示的网络场景为例, 其中包括 A/B/C/D四个网元。 如图 1B所 示, 当网元 A到网元 B的光纤故障时, 网元 B首先检测到故障并向本网元 B 的协议模块上报 SF (Signal Fail, 信号故障) 。 网元 B利用 K字节向故障相 邻网元 A分别发送长径环桥接请求和短径环桥接请求, 其中短径环桥接请求 会直接到达网元 A, 长径环桥接请求将经过网元 C和网元 D到达网元 。 网 元 A收到网元 B的短径环桥接请求后, 向网元 B发送长径环桥接请求并向 网元 B发送短径环桥接请求确认。 网元 C和网元 D检测到网元 B向网元 A 发送的长径环桥接请求后, 进入穿通状态。 网元 A收到网元 B的长径环桥接 请求后, 发生桥接倒换, 向网元 B发送长径环桥接请求确认, 长径环桥接确 认将经过网元 C和网元 D到达网元 B。 网元 B接收到网元 A发送的长径环 桥接请求和短径环桥接请求确认后, 执行桥接和倒换, 保护倒换过程结束。
可以看出, 在现有的复用段环保护方法中, 环上每一个网元中都存在一 个较为复杂的环保护协议, 并且每个网元都需要知道全环拓扑。 一旦环拓扑 发生变化, 所有网元都需要更新环拓扑图。 因此增加了网络中各节点功能的 复杂度和网络维护成本。 发明内容
本发明的实施例提供一种线路环保护方法、 系统和设备, 用于在实现线 路环保护的同时降低网络中各节点功能的复杂度和网络维护成本。
本发明的实施例提供一种线路环保护方法, 包括:
接收线路故障通知;
更新带宽地图以将线路环中的保护带宽分配给受保护的工作带宽中的业 发送该更新带宽地图;
发送桥接请求。
本发明的实施例还提供一种线路环中的主节点设备, 包括:
故障通知接收单元, 用于接收线路故障通知;
带宽分配单元, 用于更新带宽地图以将线路环中的保护带宽分配给受保 护的工作带宽中的业务;
带宽地图发送单元, 用于发送该更新带宽地图;
桥接请求发送单元, 用于在该带宽地图发送单元发送该更新带宽地图 后, 发送桥接请求。
本发明实施例还提供一种线路环中的从节点设备, 包括:
故障检测单元, 用于检测线路故障, 当故障发生时, 发送线路故障通 知;
桥接请求处理单元, 用于接收桥接请求, 进行桥接操作和倒换操作。 本发明的实施例还提供一种线路环保护系统, 包括:
至少一个从节点设备, 用于检测线路故障, 当故障发生时, 向主节点设 备发送线路故障通知, 并在接收到该主节点设备发送的桥接请求时, 进行桥 接操作和倒换操作;
主节点设备, 用于接收该从节点设备发送的线路故障通知时, 更新带宽 地图以将线路环中的保护带宽分配给受保护的工作带宽中的业务; 并向该从 节点设备发送桥接请求。
与现有技术相比, 本发明的实施例具有以下优点:
本发明的实施例中, 在对线路环进行保护时, 通过主节点集中实现网络 的管理控制功能, 对从节点的桥接和倒换进行控制, 节省了网络中各节点功 能的复杂度和网络维护成本。 附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对实施例描述中所 需要使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发 明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动的前 提下, 还可以根据这些附图获得其他的附图。
图 1A是现有技术中线路环保护的网络场景示意图;
图 1B是现有技术中线路环保护方法的流程图;
图 2是本发明的实施例中线路环保护方法的流程图;
图 3A是本发明的实施例中二纤双向线路保护倒换前的示意图; 图 3B是本发明的实施例中二纤双向线路保护倒换前的带宽地图; 图 4A是本发明的实施例中二纤双向线路保护倒换后的示意图; 图 4B是本发明的实施例中二纤双向线路保护倒换后的带宽地图; 图 5是本发明的实施例中二纤双向线路保护倒换的流程图;
图 6是本发明的实施例中二纤双向线路的恢复方法的流程图;
图 7A是本发明的实施例中二纤单向线路保护倒换前的示意图;
图 7B是本发明的实施例中二纤单向线路保护倒换前的带宽地图; 图 8A是本发明的实施例中二纤单向线路保护倒换后的示意图;
图 8B是本发明的实施例中二纤单向线路保护倒换后的带宽地图; 图 9是本发明的实施例中主节点设备的结构示意图;
图 10是本发明的实施例中主节点设备的另一结构示意图;
图 11是本发明的实施例中从节点设备的结构示意图。 具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进行 清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明的一部分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没有 做出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范 围。
现有的基于动态带宽调整的多业务传送网络架构中, 节点可以分为 N节 点和 S节点两种, N节点是普通的分散型业务接入节点, S节点除了具备 N 节点的功能外, 还是和上层网络对接的节点。 N节点也可以称为从节点, S 节点也可以称为主节点。 任何一个节点都可以直接传递传统的 TDM (Time Division Multiplex, 时分复用) 、 以太网数据业务等业务, 还可以提供 PON (Passive Optical Network, 无源光网络) 支路接口, 在 S节点还提供 10GE 等上行业务接口。 该网络承载的业务类型可以包括三种: (1 ) FB (Fixed Bandwidth , 固定带宽) 类业务, 主要用于承载带宽延时保证的业务, 如 TDM、 SDH/SONET (Synchronous Optical Network, 同步光网络) 、 专线业 务等; (2 ) AB ( Assured Bandwidth, 带宽保证) 类业务, 如视频、 VOIP (Voice IP, 语音 IP ) 、 专线等; (2 ) BE (Best Effort, 尽力保证) 类业 务, 如普通上网业务等。 对于 AB类和 BE类业务, 该网络是一种汇聚型网 络, 汇聚节点为 S节点, 该节点实现双备份。 对于 FB类业务, 该网络是一
种对等交换网络, 可以从任何一个节点传递 TDM、 SDH/SONET, 专线等业 该网络架构的一个主要特点是面向全网的 DBA ( Dynamic Bandwidth Assignment, 动态带宽分配) 模块和算法: 各节点检测、 统计和上报本节点 内部各业务端口的带宽请求信息, 上报给主机, 主机根据环上现有的带宽资 源、 各节点业务类型、 优先级等, 进行判断和计算, 最后把各节点的带宽分 配信息下发到各节点, 各节点根据分配的带宽传送数据。 这里对各节点下发 的带宽分配信息主要是带宽地图 (BWmap) 。
本发明的实施例中提供一种线路环保护方法, 应用于包括主节点和从节 点的网络中, 如图 2所示, 包括:
步骤 s201、 接收线路故障通知。
该步骤中, 从节点在检测到线路故障后向主节点发送线路故障通知, 主 节点接收该线路故障通知。
步骤 s202、 更新带宽地图以将线路环中的保护带宽分配给受保护的工作 带宽中的业务。
步骤 s203、 发送更新带宽地图。
该步骤中, 主节点将更新带宽地图发送给从节点, 使从节点对带宽地图 进行更新, 更新的具体步骤为使用新接收的带宽地图覆盖之前保存的带宽地 图。
步骤 s204、 发送桥接请求。
该步骤中, 主节点在向从节点发送更新带宽地图后, 向从节点发送桥接 请求, 从而触发从节点的桥接和倒换操作, 以对线路环中的业务进行保护。
本发明的实施例中, 通过主节点集中实现网络的管理控制功能, 对从节 点的桥接和倒换进行控制, 节省了网络中各节点功能的复杂度和网络维护成 本。
本发明的一实施例中, 以集中控制的二纤双向线路为例, 描述本发明实 施例中的线路环保护方法。 如图 3A所示, 为二纤双向线路保护倒换前的示 意图, 其中 Node-S为主节点。 Node-l、 Node-2以及 Node-3为从节点。 正常 情况下, 每根光纤各有一半容量作为工作带宽, 另一半容量作为为保护带 宽。 每根光纤的保护带宽保护另一根光纤的工作带宽。 另外, 正常情况下, 在每根光纤的工作带宽内承载被保护业务, 在每根光纤的保护带宽内可以承 载额外业务。 二纤双向线路保护倒换前的一带宽地图可以如图 3B所示, 对 于外环光纤, 工作带宽 (如图 3B中外环光纤 W所示区域) 承载被保护业务 如 FB和 AB, 保护带宽 (如图 3B中外环光纤 P所示区域) 可以承载额外业 务如 BE。 对于内环光纤, 工作带宽 (如图 3B中内环光纤 W所示区域) 承 载被保护业务如 FB和 AB, 保护带宽 (如图 3B中内环光纤 P所示区域) 可 以承载额外业务如 BE。
如图 4A所示, 当 Node-2和 Node-3之间的光纤发生故障时, 本发明实 施例中的线路环保护方法如图 5所示, 包括:
步骤 s501、 Node-2检测到 SF, 根据环拓扑通过 K字节向主网元 Node-S 通知 SF。
步骤 s502、 Node-S接收到 Node-2发送的 SF。
步骤 s503、 Node-S更新带宽地图并向各从节点发送。
具体的, Node-S收到 Node-2发送的 SF后, 通过 DBA功能更新带宽地 图。 DBA功能在 Node-S东西两个方向上, 分别将保护区带宽地图用另一方 向工作区带宽地图替换, 即将东向的保护区带宽地图用西向的工作区带宽地 图替换, 将西向的保护区带宽地图用东向的工作区带宽地图替换。 倒换后的 带宽地图如图 4B所示。 这里的东西方向定义为: 从网元的位置朝环网外 看, 将网元左侧网络方向称为西向, 右侧网络方向称为东向。 Node-S可以通 过线路上的开销向各从节点发送带宽地图。 主节点和各从节点的带宽地图替 换后保护通道上的额外业务被压制, 各从节点实现穿通。
步骤 s504、 Node-S向 Node-2和 Node-3分别发送桥接请求; 具体的, 替 换后的带宽地图在全环更新之后, Node-S根据环拓扑, 通过 K字节向 Node- 2和 Node-3分别发送桥接请求。
步骤 s505、 Node-2和 Node-3接收到 Node-S发送的桥接请求后, 分别执 行桥接操作和倒换操作。
具体的, 执行桥接操作时, Node-2和 Node-3根据桥接请求将网元西 (或东) 向端口发出的工作区数据同时向另一根光纤的东 (或西) 向端口保 护区发出。 以 Node-2进行的桥接操作为例, 如图 4A所示, Node-2将内环光 纤中西向端口 2-1发出的工作区数据同时向外环光纤中东向端口 2-2的保护 区发出。 执行倒换操作时, 将工作带宽中的收业务数据通过另一根光纤的保 护带宽收取。 以 Node-2进行的倒换操作为例, 如图 4A所示, Node-2将之前 从外环光纤中端口 2-4收取的工作区业务数据, 通过内环光纤中端口 2-3 的 保护区收取。 本发明实施例中对桥接操作和倒换操作的执行先后顺序不作限 定。
步骤 s506、 执行完桥接操作和倒换操作后, Node-2和 Node-3分别通过
K字节向 Node-S发送桥接确认。
步骤 s507、 Node-S接收到 Node-2和 Node-3的桥接确认后, 倒换完成。 倒换完成后二纤双向线路环中的数据传输方向如图 4B 中的黑色箭头标注的 方向所示。 当 Node-2和 Node-3之间的光纤从故障中恢复时, 本发明实施例中的线 路环恢复方法如图 6所示, 包括:
步骤 s601、 Node-2检测到 SF清除, 根据环拓扑通过 K字节向主网元 Node-S通知 SF清除。
步骤 s602、 Node-S接收到 Node-2发送的 SF清除。
步骤 s603、 Node-S进入 WTR等待。
步骤 s604、 WTR结束后, Node-S通过 K字节分别向 Node-2和 Node-3 分别发送取消桥接请求。
步骤 s605、 Node-2和 Node-3接收到 Node-S发送的取消桥接请求后, 分 别取消各自的桥接和倒换操作。
步骤 s606、 Node-2和 Node-3分别通过 K字节向 Node-S发送取消桥接 确认。
步骤 s607、 Node-S收到 Node-2和 Node-3 的取消桥接确认后, 通过
DBA功能恢复正常态的带宽地图并向各从节点发送, 即将保护区带宽地图替 换回倒换前的带宽地图。 被压制的额外业务恢复, 网络恢复到正常状态。 本发明的另一实施例中, 以集中控制的二纤单向线路为例, 描述本发明 实施例中的线路环保护方法。 如图 7A所示, 为二纤单向线路保护倒换前的 示意图, 其中 Node-S为主节点。 正常情况下, 被保护业务只在工作光纤上 发送和接收, 在保护光纤上可以承载额外业务如 BE。 工作光纤和保护光纤 上的带宽地图可以不同。 二纤单向线路保护倒换前的带宽地图可以如图 7B 所示。
当工作光纤出现线路故障时, 二纤单向线路的线路环保护过程和上一实 施例中二纤双向线路保护的过程类似, 同样是通过主网元来集中控制保护相 关指令的下发。 将之前由节点工作端口发出的数据改为由工作端口和保护端 口双发; 从节点执行倒换操作时, 将工作端口的收业务数据通过对应的保护 端口收取。 倒换完成后, 二纤单向线路保护环将整个工作光纤的数据桥接到 保护光纤上传送, 而不像二纤双向线路保护环那样只桥接一半光纤容量的工 作带宽。 倒换完成后的网络示意图以及带宽地图如图 8A和 8B所示, 具体过 程此实施例中不再详述, 可参考上一实施例中的描述。
本发明的上述实施例中, 以二纤环为例说明了线路环保护方法的具体实 施方式, 对于四纤环网络, 处理方式与二纤环类似, 此处不再详述。 另外,
本发明实施例所提及的二纤除了表示物理光纤外, 也可以表示一对位于不同 物理光纤上传输方向相反的波长, 同样也适用于四纤环。
本发明的实施例中, 通过主节点集中实现网络的管理控制功能, 对从节 点的桥接和倒换进行控制, 节省了网络中各节点功能的复杂度和网络维护成 本。 这是因为, 对于现有的类似基于动态带宽调整的多业务传送网络, 从节 点上要求功能尽量简单以降低网络维护成本, 因此现有复用段环保护机制不 适用于这类网络中, 而本发明实施例提供的方法中, 网络的管理控制等功能 都通过主节点集中控制。 通过主网元集中控制环保护协议, 从网元只需保留 简单的保护功能, 无需像复用段环保护那样保留完整的保护协议以及维护全 环拓扑, 大大降低了从网元的实现及维护成本。 另外, 通过提供线路级的环 保护机制, 提高了环网的生存性; 同时保护通道平时可以传送额外业务, 提 高了带宽利用率。 最后, 通过和动态带宽调整 DBA相结合, 在保护倒换时 简化了保护协议处理, 通过更新带宽地图即可自动实现中间网元的穿通。 本发明的实施例还提供一种线路环保护系统, 包括:
至少一个从节点设备, 用于当检测到线路故障发生时, 向主节点设备发 送线路故障通知, 并在接收到主节点设备发送的桥接请求时, 进行桥接和倒 换操作, 以对线路环中的业务进行保护;
主节点设备, 用于接收从节点设备发送的线路故障通知, 更新带宽地图 以将线路环中的保护带宽分配给受保护的工作带宽中的业务; 并向从节点设 备发送桥接请求, 以对线路环中的业务进行保护。
另外, 从节点设备, 还用于检测到线路故障清除时, 向主节点设备发送 线路故障清除通知, 并在接收到主节点设备发送的取消桥接请求时, 取消桥 接和倒换操作并发送取消桥接确认;
主节点设备, 还用于接收到从节点设备发送的线路故障清除通知时, 向 从节点发送取消桥接请求, 接收到从节点的取消桥接确认时, 将保护区带宽 地图替换回倒换前的带宽地图, 以恢复网络到故障发生前的状态。 本发明的实施例还提供一种线路环中的主节点设备 10, 如图 9所示, 包 括:
故障通知接收单元 11, 用于接收线路故障通知。
带宽分配单元 12, 用于更新带宽地图以将线路环中的保护带宽分配给受 保护的工作带宽中的业务。
带宽地图发送单元 13, 用于发送更新带宽地图。
桥接请求发送单元 14, 用于在带宽地图发送单元 13发送更新带宽地图 后, 发送桥接请求, 触发从节点的桥接和倒换操作, 以对线路环中的业务进 行保护。
本发明的另一实施例中, 如图 10所示, 主节点设备 10还包括: 故障清除通知接收单元 15, 用于接收线路故障清除通知;
取消桥接请求发送单元 16, 用于发送取消桥接请求, 触发从节点取消桥 接和倒换操作;
带宽恢复单元 17, 用于接收到取消桥接确认时, 将保护区带宽地图替换 回倒换前的带宽地图并发送, 以恢复网络到故障发生前的状态。
另外, 上述带宽管理单元 12具体可以包括:
带宽地图更新子单元 121, 用于通过 DBA功能更新带宽地图, 即将线路 环中的保护区域的带宽地图替换为受保护的工作区域的带宽地图;
业务分配子单元 122, 用于根据带宽地图更新子单元 121更新后的带宽 地图, 将线路环中的保护带宽分配给受保护的工作带宽中的业务。
本发明的实施例中, 通过主节点集中实现网络的管理控制功能, 对从节 点的桥接和倒换进行控制, 节省了网络中各节点功能的复杂度和网络维护成 本。 如图 11所示, 本发明实施例还提供一种线路环中的从节点设备 20, 包 括:
故障检测单元 21, 用于检测线路故障, 当故障发生时, 发送线路故障通 知;
桥接请求处理单元 22, 用于接收桥接请求, 进行桥接操作和倒换操作。 本发明的另一实施例中, 所述故障检测单元 21还用于: 检测到线路故 障清除时, 发送线路故障清除通知;
所述桥接请求处理单元 22还用于: 接收到取消桥接请求时, 取消桥接 操作和倒换操作并发送取消桥接确认。
本发明实施例中, 从节点处理上相对于当前的 MSP复用段节点要有很 大的简化, 只需上报线路故障状态以及执行倒换桥接操作, 节点上无需运行 复杂的环保护协议, 并且无需知道全环拓扑。
通过以上的实施方式的描述, 本领域的技术人员可以清楚地了解到本发 明可以通过硬件实现, 也可以借助软件加必要的通用硬件平台的方式来实 现。 基于这样的理解, 本发明的技术方案可以以软件产品的形式体现出来, 该软件产品可以存储在一个非易失性存储介质 (可以是 CD-ROM, U盘, 移 动硬盘等) 中, 包括若干指令用以使得一台计算机设备 (可以是个人计算 机, 服务器, 或者网络设备等) 执行本发明各个实施例所述的方法。
以上公开的仅为本发明的几个具体实施例, 但是, 本发明并非局限于 此, 任何本领域的技术人员能思之的变化都应落入本发明的保护范围。
Claims
1、 一种线路环保护方法, 其特征在于, 包括:
接收线路故障通知;
更新带宽地图以将线路环中的保护带宽分配给受保护的工作带宽中的业 发送所述更新带宽地图;
发送桥接请求。
2、 如权利要求 1所述的方法, 其特征在于, 所述更新带宽地图以将线 路环中的保护带宽分配给受保护的工作带宽中的业务包括:
通过动态带宽分配 DBA功能更新带宽地图, 将线路环中的保护区域的 带宽地图替换为受保护的工作区域的带宽地图, 从而将所述线路环中的保护 带宽分配给受保护的工作带宽中的业务。
3、 如权利要求 1或 2所述的方法, 其特征在于, 将所述线路环中的保护 带宽分配给受保护的工作带宽中的业务前, 所述线路环中的保护带宽中承载 有额外业务; 将所述线路环中的保护带宽分配给受保护的工作带宽中的业务 后, 所述额外业务被所述受保护的工作带宽中的业务压制。
4、 如权利要求 1所述的方法, 其特征在于,
所述发送更新带宽地图后, 还包括: 接收到所述更新带宽地图的从节点 根据所述更新带宽地图对本地的带宽地图进行更新;
所述发送桥接请求后, 还包括: 接收到所述桥接请求的从节点进行桥接 操作和倒换操作。
5、 如权利要求 4所述的方法, 其特征在于, 所述线路环为二纤双向线 路时,
所述从节点的桥接操作包括: 将从节点西向端口发出的数据同时向另一 根光纤的东向端口发出; 或将从节点东向端口发出的数据同时向另一根光纤 的西向端口发出;
所述从节点的倒换操作包括: 将倒换端口的收业务数据通过另一根光纤 的保护带宽收取。
6、 如权利要求 4所述的方法, 其特征在于, 所述线路环为二纤单向线 路时,
所述从节点的桥接操作包括: 将之前由节点工作端口发出的数据改为由 工作端口和保护端口双发;
所述从节点的倒换操作包括: 将工作端口的收业务数据通过对应的保护 端口收取。
7、 如权利要求 5或 6所述的方法, 其特征在于, 所述二纤还可以是一对 位于不同物理光纤上传输方向相反的波长。
8、 如权利要求 1所述的方法, 其特征在于, 所述发送桥接请求后, 还 包括:
接收线路故障清除通知;
发送取消桥接请求;
接收到取消桥接确认时, 将保护区带宽地图替换回倒换前的带宽地图并 发送, 以恢复网络到故障发生前的状态。
9、 如权利要求 1或 8所述的方法, 其特征在于, 所述线路故障通知、 桥 接请求、 线路故障清除通知、 取消桥接请求以及取消桥接确认, 通过线路开 销中的 K字节进行标识。
10、 一种线路环中的主节点设备, 其特征在于, 包括:
故障通知接收单元, 用于接收线路故障通知;
带宽分配单元, 用于更新带宽地图以将线路环中的保护带宽分配给受保 护的工作带宽中的业务;
带宽地图发送单元, 用于发送所述更新带宽地图;
桥接请求发送单元, 用于在所述带宽地图发送单元发送所述更新带宽地 图后, 发送桥接请求。
11、 如权利要求 10所述的主节点设备, 其特征在于, 所述带宽管理单 元具体包括:
带宽地图更新子单元, 用于通过 DBA功能更新带宽地图, 将线路环中 的保护区域的带宽地图替换为受保护的工作区域的带宽地图;
业务分配子单元, 用于根据所述带宽地图更新子单元更新后的带宽地 图, 将线路环中的保护带宽分配给受保护的工作带宽中的业务。
12、 如权利要求 10所述的主节点设备, 其特征在于, 还包括: 故障清除通知接收单元, 用于接收线路故障清除通知;
取消桥接请求发送单元, 用于发送取消桥接请求;
带宽恢复单元, 用于接收到取消桥接确认时, 将保护区带宽地图替换回 倒换前的带宽地图并发送, 以恢复网络到故障发生前的状态。
13、 一种线路环中的从节点设备, 其特征在于, 包括:
故障检测单元, 用于检测线路故障, 当故障发生时, 发送线路故障通 知;
桥接请求处理单元, 用于接收桥接请求, 进行桥接操作和倒换操作。
14、 如权利要求 13所述的从节点设备, 其特征在于, 所述故障检测单 元还用于: 检测到线路故障清除时, 发送线路故障清除通知;
所述桥接请求处理单元还用于: 接收到取消桥接请求时, 取消桥接操作 和倒换操作并发送取消桥接确认。
15、 一种线路环保护系统, 其特征在于, 包括:
至少一个从节点设备, 用于检测线路故障, 当故障发生时, 向主节点设 备发送线路故障通知, 并在接收到所述主节点设备发送的桥接请求时, 进行 桥接操作和倒换操作;
主节点设备, 用于接收所述从节点设备发送的线路故障通知时, 更新带 宽地图以将线路环中的保护带宽分配给受保护的工作带宽中的业务; 并向所 述从节点设备发送桥接请求。
16、 如权利要求 15所述的线路环保护系统, 其特征在于,
所述从节点设备, 还用于检测到线路故障清除时, 向所述主节点设备发 送线路故障清除通知, 并在接收到所述主节点设备发送的取消桥接请求时, 取消桥接操作和倒换操作并发送取消桥接确认;
所述主节点设备, 还用于接收到所述从节点设备发送的线路故障清除通 知时, 向从节点发送取消桥接请求, 接收到从节点的取消桥接确认时, 将保 护区带宽地图替换回倒换前的带宽地图, 以恢复网络到故障发生前的状态。
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