WO2011020339A1 - 一种分段保护中的切换方法及系统 - Google Patents

一种分段保护中的切换方法及系统 Download PDF

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Publication number
WO2011020339A1
WO2011020339A1 PCT/CN2010/072068 CN2010072068W WO2011020339A1 WO 2011020339 A1 WO2011020339 A1 WO 2011020339A1 CN 2010072068 W CN2010072068 W CN 2010072068W WO 2011020339 A1 WO2011020339 A1 WO 2011020339A1
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segment
protection
tesi
working
protected
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PCT/CN2010/072068
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English (en)
French (fr)
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吴少勇
魏月华
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中兴通讯股份有限公司
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Publication of WO2011020339A1 publication Critical patent/WO2011020339A1/zh

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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
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0893—Assignment of logical groups to network elements
    • 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

Definitions

  • the present invention relates to the field of network communications, and in particular, to a handover method and system in a segmentation protection based on a carrier-grade Ethernet technology, that is, a carrier backbone bridge technology (PBB-TE, Provider Backbone Bridge Traffic Engineering).
  • PBB-TE carrier backbone bridge technology
  • Ethernet technology Due to its simplicity, high efficiency and low cost, Ethernet technology has been widely used in local area networks, and is rapidly moving from LAN-based networking technologies to enterprise networks, metropolitan area telecommunications networks, and wide-area telecommunications networks. As a result of the development of a wide range of networking technologies, carrier-grade Ethernet technology has emerged.
  • PBB-TE also known as Provider Backbone Transport (PBT) technology
  • PBT Provider Backbone Transport
  • PBB-TE technology is based on the Provider Backbone Bridge (PBB) technology.
  • PBB Provider Backbone Bridge
  • IEEE 802.1ah The core of the technology is the improvement of PBB technology.
  • the network management and control enable the services in the Ethernet. In fact, it has connectivity to enable the functions of telecommunication networks such as protection switching, operation, management and management (QoS), quality of service (QoS), and traffic engineering.
  • the PBB-TE technology uses the outer media access control (MAC) plus the outer virtual local area network (VLAN), which is the backbone destination MAC address (B-DA) and the backbone network VLAN ID (B-VID). For service forwarding, the forwarding path is pre-configured. PBB-TE technology compatible transmission
  • the architecture of the Ethernet bridge can forward data frames based on B-DA and B-VID without updating the network intermediate nodes. The data frames do not need to be modified, and the forwarding efficiency is high.
  • FIG. 1 is a schematic structural diagram of an end-to-end protection mechanism in a PBB-TE based network according to the prior art. As shown in FIG.
  • PE1 and PE2 are both ends of a working entity and a protection entity.
  • the path of the working entity is PE1-P1-P2-P3-PE2, and the path of the protection entity is PE1-P4-P5-PE2.
  • the working entity and the protection entity are pre-configured with their own VLANs.
  • node PE1 When traffic enters the PBB-TE network, the end node, as shown in Figure 1, node PE1, also known as the edge node, encapsulates the frame into a frame in the PBB-TE network based on information such as the ingress port and VLAN of the frame in the traffic. Format, that is, encapsulating a layer header on the original data frame header.
  • the source MAC address in the backbone MAC address (B-MAC) is the MAC address of the ingress node, that is, PE1
  • the destination MAC address is the MAC address of the egress node, that is, PE2.
  • the new frame header also encapsulates the service VLAN tag (I-tag) and B-VID, etc., where the B-VID is a pre-set VLAN of the selected working entity or protection entity.
  • This new transmission instance is called the Traffic Engineered Service Instance (TESI) in the PBB-TE network.
  • TESI Traffic Engineered Service Instance
  • PE1 When both the working entity and the protection entity are in a normal state, PE1 encapsulates the B-VID of the frame in the traffic as the VLAN of the working entity, and the traffic is transmitted from the working entity.
  • the transmission path is PE1-P1-P2-P3-PE2, such as Figure 1 shows.
  • PE1 When the working entity fails, PE1 encapsulates the B-VID of the frame in the traffic as the VLAN of the protection entity, and the traffic is switched to the protection entity for transmission.
  • the path is PE1-P4-P5-PE2.
  • Figure 2 is a schematic diagram of traffic flow after the PBB-TE-based network protection switchover.
  • node PE2 also called the edge node
  • the egress node restores the frame in the PBB-TE network to the normal data frame format and outputs it.
  • end-to-end protection can only perform full path protection.
  • the probability of simultaneous failure of the working entity and the protection entity Larger, if the working entity and the protection entity fail at the same time, end-to-end traffic will be lost.
  • the failure of the segment will cause the full path to be switched, which is not conducive to network optimization.
  • the existing end-to-end protection mechanism architecture of the PBB-TE-based network can reduce the speed of fault recovery because only full path protection can be performed, and the protection switching involves all nodes in the full path, which is not conducive to network optimization, and Reduce the reliability of end-to-end traffic.
  • the main object of the present invention is to provide a handover method in segment protection and
  • the system improves the speed of fault recovery, reduces the number of nodes that protect switching, facilitates network optimization, and ensures end-to-end traffic reliability.
  • a handover method in segmentation protection comprising:
  • TTIs Traffic Engineering Service Instances
  • the protection switching of the link where the TESI is located is implemented according to the current protection switching mechanism.
  • the physical link where the TESI is located belongs to a local area in a carrier backbone bridge technology (PBB-TE) network; the TESI can transmit each network segment and intermediate node through the working segment and the protection segment. ;
  • PBB-TE carrier backbone bridge technology
  • the working segment and the protection segment have two common end nodes; the working segment and the protection segment are included in the path of the PBB-TE; the end node of the working segment and the protection segment coincides or does not coincide with the end node of the PBB-TE .
  • the performing the state detection specifically includes: performing continuous state detection on the two end nodes of the working segment, or performing continuous state detection on the two end nodes of the protection segment.
  • the status detection is specifically that the working segment is not faulty
  • the implementation of the protection switching specifically includes: The end node of the segment protection domain will be protected.
  • the outbound port of the TESI is selected on the working segment, and the traffic of the protected TESI is transmitted through the working segment.
  • the status detection is specifically that the working segment is faulty, and the protection segment is not faulty.
  • the implementing the protection switching specifically includes: the end node of the segmentation protection domain is selected to be protected on the protection segment, and the TESI is protected. The traffic is transmitted through the protection segment.
  • the status detection is specifically a work segment failure recovery, the protection segment is faultless, and the segmentation is performed.
  • the protection domain is set to non-return mode;
  • the implementation of the protection switching specifically includes: the end node of the segment protection domain keeps being protected.
  • the egress port of the TESI is selected on the protection segment, and the traffic of the protected TESI is transmitted through the protection segment.
  • the status detection is specifically a work segment failure recovery, the protection segment is faultless, and the segment protection domain is set to a return mode;
  • the implementation of the protection switching specifically includes: the end node of the segment protection domain waits until the failure is reached. After determining the time that has been recovered, the outbound port of the protected TESI is selected on the working segment, and the traffic of the protected TESI is transmitted through the working segment.
  • a switching system in a segmentation protection comprising: a selection unit, a setting unit, a state detecting unit, and a protection switching implementing unit;
  • a selection unit configured to select a group of TESIs as protected objects of the set segment protection domain
  • a setting unit configured to set a segmentation protection domain, and set a work segment and a protection segment in the segment protection domain
  • a state detecting unit configured to perform state detection on the working segment and the protection segment
  • a protection switching implementation unit configured to implement a link where the TESI is located according to a current protection switching mechanism under different state detection or protection switching requests Protection switching.
  • the state detecting unit is further configured to perform continuous state detection on both end nodes of the working segment, or perform continuous state detection on both end nodes of the protection segment.
  • the protection switching implementation unit is further configured to: when the state detection is specifically that the working segment is not faulty, the end node of the segmentation protection domain is to be selected on the working segment of the protection TESI, and the traffic of the TESI is protected. Transfer through the working segment; or,
  • the protection switching implementation unit is further configured to: when the state detection is specifically that the working segment is faulty, and the protection segment is not faulty, the end node of the segmentation protection domain is selected by the protection TESI out port on the protection segment, The traffic protecting the TESI is transmitted through the protection segment; or,
  • the protection switching implementation unit is further configured to detect, in the state, the working segment fault recovery If the protection segment is not faulty and the segmentation protection domain is set to the non-return mode, the end node of the segmentation protection domain keeps the outbound port of the protected TESI selected on the protection segment, and the traffic of the protected TESI passes through the protection segment. Transmission; or,
  • the protection switching implementation unit is further configured to: when the status detection is specifically working segment failure recovery, the protection segment is faultless, and the segment protection domain is set to the return mode, the end node of the segmentation protection domain waits until the fault is determined. After the recovered time, the outgoing port of the protected TESI is selected on the working segment, and the traffic of the protected TESI is transmitted through the working segment.
  • the invention sets a segmentation protection domain, and selects a group of TESI as the protected object of the segment protection domain; sets the working segment and the protection segment in the segment protection domain, and performs state detection on the working segment and the protection segment; Under the state detection or protection switching request, the protection switching of the link where the TESI is located is implemented according to the current protection switching mechanism.
  • the adaptive protection switching mechanism can be selected under different state detection or protection switching requests to implement protection switching. Since the selected most suitable protection switching mechanism can be selected, the protection can be implemented as soon as possible. Switching, thereby improving the speed of fault recovery, reducing the nodes of protection switching, is conducive to network optimization, and ensures end-to-end traffic reliability.
  • FIG. 1 is a schematic diagram of an end-to-end protection mechanism in a prior art PBB-TE network
  • FIG. 2 is a schematic diagram of traffic flow after PBB-TE network protection switching in the prior art
  • FIG. 3 is a schematic diagram of an implementation process of the method of the present invention.
  • FIG. 4 is a schematic diagram of a segmentation protection mechanism of the present invention.
  • FIG. 5 is a schematic diagram of traffic flow after segmentation protection switching according to the present invention. detailed description
  • the basic idea of the present invention is: setting a segmentation protection domain, and selecting a group of TESI as protected objects of the segmentation protection domain; setting a work segment and a protection segment in the segment protection domain, and The protection segment performs state detection. Under different state detection or protection switching requests, the protection switching of the link where the TESI is located is implemented according to the current protection switching mechanism.
  • a handover method in segmentation protection is characterized in that the method includes the following steps:
  • Step 101 Set a segmentation protection domain, and select a group of TESI as the protected object of the segmentation protection domain.
  • Step 102 Set a working segment and a protection segment in the segment protection domain, and perform status detection on the working segment and the protection segment.
  • performing the state detection specifically includes: performing continuous state detection on both end nodes of the working segment; performing continuous state detection on both end nodes of the protection segment. It should be pointed out that: the detection of the working segment and the detection of the protection segment are independent between each other, and there is no clear prior relationship between the two.
  • the detection of the working segment and the protection segment can use the fault detection mechanism defined in IEEE 802.1ag, for example, by sending a connectivity check message (CCM, Continuity Check Message) along the working tunnel and the backup tunnel.
  • CCM connectivity check message
  • Step 103 Under different state detection or protection switching requests, implement protection switching of the link where the TESI is located according to the current protection switching mechanism.
  • the protection switching can be a protection switching for the redirect or recovery redirection of the faulty link where TESI is located.
  • the TESI as the protected object is carried on the working segment.
  • the working segment fails, the TESI on the working segment is redirected to the protection segment.
  • the working segment returns to normal, redirect the TESI recovery on the protection segment to the working segment.
  • the physical link where TESI is located belongs to a local area in the PBB-TE network; TESI can transmit each network segment and intermediate node through the working segment and the protection segment.
  • the working segment and the protection segment have two common end nodes; the working segment and the protection segment are included in Within the path of the PBB-TE; the end nodes of the working and protection segments coincide or do not coincide with the end nodes of the PBB-TE.
  • step 103 The specific processing of step 103 is described below in the scenario of different state detection.
  • Solution 1 The scenario is a case where the working segment is not faulty.
  • the protection switching is implemented as follows: The end node of the segment protection domain will be protected.
  • the outbound port of TESI is selected on the working segment, and the traffic of TESI is protected through the working segment.
  • Solution 2 The scenario is that the working segment is faulty and the protection segment is not faulty.
  • the protection switching is implemented as follows: The end node of the segment protection domain will be protected.
  • the outbound port of TESI is selected on the protection segment, and the traffic of TESI is protected through the protection segment.
  • Solution 3 The scenario is that the working segment is faulty, the protection segment is not faulty, and the segmentation protection domain is set to the non-return mode.
  • the protection switching is implemented as follows: The end node of the segment protection domain is kept protected. The egress port of TESI is selected on the protection segment, and the traffic of the protected TESI is transmitted through the protection segment.
  • Option 4 The scenario is that the working segment is faulty, the protection segment is not faulty, and the segmentation protection domain is set to the return mode.
  • the protection switching is implemented as follows: After waiting for a period of time, the end node of the segment protection domain will be protected. The egress port of the TESI is selected on the working segment, and the traffic of the protected TESI is transmitted through the working segment. For the above waiting period, it is: Wait until the time when the fault is determined to have recovered. This is to prevent frequent failures after link recovery, resulting in frequent protection switching, so this period of time is an empirical value, usually from the second to the minute.
  • the present invention introduces a protection mechanism selection in different scenarios to implement targeted protection switching in different scenarios, including: presetting a segmentation protection domain, or simply a protection domain, specifying a segmentation protection domain.
  • a set of TESIs that are protected. Specifies the working and protection segments of the segmentation protection domain. Status detection is performed on the working segment and the protection segment.
  • the end node of the segmentation protection domain selects the working segment as the transmission path of the protected TESI; when the working segment fails, When the protection segment is fault-free, the end node of the segmentation protection domain selects the protection segment as the transmission path of the protected TESI; when the working segment fails to recover, and the protection segment has no failure, the end node of the segmentation protection domain is according to the current mode.
  • the return or non-return mode selects the working segment or the protection segment as the transmission path of the protected TESI.
  • the segment protection domain is determined, and the working segment and the protection segment are set in the determined segment protection domain.
  • the working segment path fails, only the traffic of the working segment path is switched to its protected segment path instead of the full path switching, which improves the speed of fault recovery and reduces the nodes involved in the protection switching.
  • the adaptive protection switching mechanism can be selected in the scenario of different state detection to implement the protection switching.
  • the optional solution of the selected most suitable protection switching mechanism of the present invention is more conducive to network optimization. And ensure the reliability of end-to-end traffic.
  • the present invention provides two modes to provide switching, namely non-return mode and return mode, non-return mode can prevent traffic loss during switchback, and return mode can be used for working segment path better than protection segment path. Scenes.
  • the present invention can improve the speed of fault recovery, reduce the nodes of protection switching, facilitate network optimization, and ensure end-to-end traffic reliability.
  • the invention is illustrated by way of example below.
  • Step 201 Select an area to be protected by the segment protection domain, and set the working segment and the protection segment in the segment protection domain.
  • the protected area is a part of the network in the PBB-TE network, which may be called a local area, or a segment or a segment network, which is determined in advance according to the actual situation of the network, such as being particularly vulnerable or particularly important.
  • Some segments of the segment can be set as segmentation areas.
  • the protection of the segmented network in this paper can also be called: local area protection, or area protection; For segment protection, or segmentation protection, there are other similar names.
  • the working segment and the end of the protection segment respectively have two end nodes, and the two end nodes of the working segment and the protection segment are coincident.
  • a working segment port and a protection segment port are set on the ingress node, and a working segment port and a protection segment port are set on the out node.
  • the address table of the traffic forwarding is preset in the nodes on the working segment and the protection segment.
  • the specific setting method belongs to the technical means used by those skilled in the art, and details are not described herein again.
  • Step 201 emphasizes that in the PBB-TE based network, the local network that needs to be protected is determined, and the working segment and the protection segment are set in the determined local network.
  • the local network may be one or more, and the specific quantity is related to the situation in which protection is actually needed.
  • Step 202 Set the protected TESI in the segment protection domain.
  • the segment protection domain performs handover, only the traffic of the TESI protected by the segment protection domain is switched, and the traffic of the TESI not protected by the segment protection domain is not switched.
  • Step 203 Perform a fault detection mechanism defined in IEEE 802. lag on both end nodes of the working segment to continuously perform state detection on the working segment; perform IEEE on both end nodes of the protection segment.
  • Step 204 When the working segment has no In the event of a failure, the end node of the segmentation protection domain will be protected by the outgoing port of TESI on the working segment, and the traffic protected by TESI is transmitted through the working segment.
  • Step 205 When the working segment fails, if the protection segment is not faulty, the end node of the segment protection domain will be protected.
  • the outbound port of TESI is selected on the protection segment, and the traffic of the protected TESI is transmitted through the protection segment.
  • the protected TESI traffic can be immediately switched to the protection segment, which ensures fast recovery of the protected traffic and prevents severe network interruption due to the working segment failure.
  • Step 206 When the working segment fault is recovered and the protection segment is not faulty, if the segment protection domain is set to the non-return mode, proceed to step 207, otherwise proceed to step 208.
  • Step 207 The segmentation protection is set to the non-return mode, and the end node of the segmentation protection domain keeps the outbound port of the protected TESI selected on the protection segment, and the traffic of the protected TESI is transmitted through the protection segment.
  • the segment protection domain is set to the non-return mode, after the working segment is restored, the protected traffic does not need to be switched back, preventing the loss of traffic due to the segmentation protection switchback.
  • Step 208 The segmentation protection is set to the return mode, and the end node of the segmentation protection domain selects the outbound port of the protected TESI on the working segment after waiting for a period of time, and the traffic of the protected TESI is transmitted through the working segment.
  • the segment protection domain is set to the return mode, especially when the working segment path is better than the protection segment path, when the working segment is restored, the protected traffic is switched back, so that the traffic continues to be transmitted on the preferred path.
  • PE1-P1-P2-P3-PE2 is a traffic transmission entity of a PBB-TE based network, PE1 and PE2.
  • PE1 and PE2 For the end node. It is assumed that P1-P2-P3 is the working segment of the segmentation protection domain in this embodiment, and P1-P4-P3 is the protection segment of the segmentation protection domain in this embodiment. The working segment and the protection segment have the same end node P1. And P3.
  • the source address in the B-MAC of the data frame is the MAC address of the node of the PE1
  • the destination address is the MAC address of the node of the PE2
  • the B-VID is the traffic.
  • the pre-configured VLAN on the transport entity for example, is assumed to be VID1, and the transport instance of this traffic is TESI1.
  • TESI1 configures as the protected TESI.
  • FIG. 5 is a schematic diagram of traffic after a protection switching of a segment protection domain in a PBB-TE network according to the present invention.
  • the end node of the segmentation protection domain keeps the outbound port of the protected TESI selected on the protection segment, which is protected by TESI. Traffic is transmitted through the protection segment, and the protected traffic does not need to be switched back, preventing traffic loss due to segmentation protection switchback. If the segmentation protection is set to the return mode, the end node of the segment protection domain will wait for a period of time to select the outbound port of the protected TESI on the working segment, and the traffic of the protected TESI is transmitted through the working segment.
  • a switching system in segment protection comprising: a selection unit, a setting unit, a state detecting unit, and a protection switching implementing unit.
  • the selection unit is configured to select a group of TESIs as protected objects of the set segment protection domain.
  • the setting unit is configured to set the segment protection domain, and set the working segment and the protection segment in the segment protection domain, and notify the set working segment and the protection segment to the status detecting unit.
  • the state detecting unit is configured to perform state detection on the working segment and the protection segment, and notify the protection switching implementation unit of the state detection scenario.
  • the protection switching implementation unit is configured to implement protection switching of the link of the TESI according to the current protection switching mechanism under different state detection or protection switching requests.
  • the state detecting unit is further configured to perform continuous state detection on both end nodes of the working segment and perform continuous state detection on both end nodes of the protection segment.
  • the protection switching implementation unit is based on different state detection scenarios, and the specific implementations are different, which are specifically described below.
  • the specific implementation scheme 1 the protection switching implementation unit, further used in the state detection scenario is specifically: when the working segment is not faulty, the end node of the segmentation protection domain will be selected on the working segment of the protection TESI out port, The traffic of the protected TESI is transmitted through the working segment.
  • the specific implementation scheme 2 the protection switching implementation unit, further used in the state detection scenario is specifically: when the working segment fails, and the protection segment is not faulty, the end node of the segmentation protection domain will be protected by the TESI out port On the protection segment, the traffic of the protected TESI is transmitted through the protection segment.
  • the specific implementation scheme 3 the protection switching implementation unit, further used in the state detection scenario is specifically: the working segment failure recovery, the protection segment is not faulty, and the segment protection domain is set to the non-return mode, the segmentation protection domain
  • the end node keeps the outgoing port of the protected TESI selected on the protection segment, and the traffic protected by TESI is transmitted through the protection segment.
  • the specific implementation scheme 4 the protection switching implementation unit, and the scenario used for the state detection is specifically: when the working segment is faulty, the protection segment is faultless, and the segment protection domain is set to the return mode, the segment protection domain is terminated.
  • the node selects the outbound port of the protected TESI on the working segment, and the traffic of the protected TESI is transmitted through the working segment.

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Abstract

本发明公开了一种分段保护中的切换方法，该方法包括：选择一组流量工程服务实例（TESI） ，作为设置的分段保护域的被保护对象；在分段保护域中设置工作段和保护段，并对工作段和保护段进行状态检测；在不同的状态检测或者保护倒换请求下， 根据当前的保护切换机制实现TESI所在链路的保护倒换。本发明还公开了一种分段保护中的切换系统，该系统中，保护切换实现单元，用于在不同的状态检测或者保护倒换请求下，根据当前的保护切换机制实现TESI所在链路的保护倒换。 采用本发明的方法及系统，提高了故障恢复的速度，减少了保护倒换的节点，有利于网络的优化，并且保证端到端流量的可靠性。

Description

一种分段保护中的切换方法及系统 技术领域
本发明涉及网络通信领域， 尤其涉及一种基于电信级以太网技术即支 持流量工程的运营商骨干桥接技术 （PBB-TE, Provider Backbone Bridge Traffic Engineering ) 的分段保护中的切换方法及系统。 背景技术
以太网技术由于其自身具有的简单、 高效和低成本等特点， 在局域网 中得到了广泛的应用， 并正迅速从局域网为主的组网技术向企业网、 城域 电信网和广域电信网等大范围的组网技术发展， 因此， 电信级的以太网技 术应运而生。
美国电气和电子工程师协会（ IEEE, Institute of Electrical and Electronics Engineers ) 提出了电信级以太网技术即 PBB-TE , 对应的标准为 IEEE 802.1 Qay。 PBB-TE 也称为运营商骨干传送 ( PBT , Provider Backbone Transport )技术，是一种面向连接的以太网技术，所有流量根据地址表转发。 PBB-TE技术以运营商骨干桥接 ( PBB, Provider Backbone Bridge )技术为 基础， 其对应的标准为 IEEE 802.1ah, 其核心是对 PBB技术的改进， 通过 网络管理和控制， 使以太网中的业务事实上具有连接性， 以便实现保护倒 换、运行、管理和维护 ( 0 AM, Operation, Administration and Management ), 服务质量（QoS, Quality of Service ), 流量工程等电信网络的功能。 PBB-TE 技术釆用外层媒体接入控制（MAC )加上外层虚拟局域网（VLAN, Virtual Local Area Network )即骨干网目的 MAC地址（ B-DA )和骨干网 VLAN ID ( B-VID )进行业务转发， 其转发路径是预先配置的。 PBB-TE技术兼容传 统以太网桥的架构， 不需要对网络中间节点进行更新即可基于 B-DA 和 B-VID对数据帧进行转发， 数据帧也不需要修改， 转发效率高。
为了提高网络的可靠性， 基于 PBB-TE 的网络中釆用端到端的保护机 制， 即端到端之间有两条隧道实体， 分别为工作实体和保护实体， 并釆用 IEEE 802.1 ag中的连接性故障管理（ CFM , Connectivity Fault Management ) 机制持续地对工作实体和保护实体分别进行状态检测。 当工作实体失效时 , 将业务自动转移到预先建立的保护实体上， 这种端到端的保护机制对 PBB-TE网络增加了必要的弹性。 图 1为现有技术基于 PBB-TE的网络中端 到端保护机制的结构示意图， 如图 1 所示， 在一个 PBB-TE 网络中， PE1 和 PE2 为工作实体和保护实体的两端节点， 工作实体的路径为 PE1-P1-P2-P3-PE2, 保护实体的路径为 PE1-P4-P5-PE2。 工作实体和保护实 体预先设置有各自的 VLAN。
当流量进入 PBB-TE网络时， 端节点， 如图 1中的节点 PE1 , 也称为边 缘节点根据该流量中帧的入端口和 VLAN等信息， 将该帧封装为 PBB-TE 网络中的帧格式， 即在原始数据帧头上再封装一层帧头。 新封装的帧头中， 骨干 MAC地址（ B-MAC )中的源 MAC地址为入端节点即 PE1的 MAC地 址， 目的 MAC地址为出端节点即 PE2的 MAC地址。 此外， 新的帧头中还 封装了业务 VLAN的标签（ I-tag )和 B-VID等信息， 其中 B-VID为选择传 输的工作实体或者保护实体预先设置的 VLAN。 这种新的传输实例在 PBB-TE网络中被称为流量工程月良务实例（ TESI, Traffic Engineered Service Instance )。
当工作实体和保护实体都为正常状态时， PE1将流量中帧的 B-VID封 装为工作实体的 VLAN , 流量从工作实体上传输， 其传输路径为 PE1-P1-P2-P3-PE2, 如图 1所示。 当工作实体发生故障时， PE1将流量中帧 的 B-VID封装为保护实体的 VLAN, 流量切换到保护实体上传输， 其传输 路径为 PE1-P4-P5-PE2 , 如图 2所示， 图 2为现有技术基于 PBB-TE的网络 发生保护切换后的流量示意图。
当流量传输到 PBB-TE网络的另外一个端节点，如图 1中节点 PE2 ,也 称为边缘节点时， 该出端节点将 PBB-TE 网络中的帧还原为普通数据帧格 式后输出。
从目前的端到端保护机制的结构来看， 端到端的保护只能进行全路径 保护， 这样， 对于工作实体和保护实体的路径都很长的情况， 工作实体和 保护实体同时发生故障的概率就较大， 如果工作实体和保护实体同时发生 故障， 则端到端的流量就会丟失。 对于工作实体或者保护实体的路径中某 一段特别脆弱或者某一段特别重要的情况， 该段的故障会导致全路径进行 切换， 不利于网络的优化。 现有基于 PBB-TE 的网络中端到端保护机制架 构， 由于只能进行全路径保护， 减緩了故障恢复的速度， 而且保护倒换牵 涉全路径中的所有节点， 不利于网络的优化， 而且降低了端到端流量的可 靠性。
当路径中某一段特别脆弱或者某一段特别重要时， 可以只对端到端隧 道的局部链路进行保护。 局部链路保护可以保护承载在这段链路上的所有 隧道实例。 将局部链路保护与端到端的隧道实例的全路径保护相结合， 可 以增强 PBB-TE 网络的健壮性， 提高故障恢复速度并减少保护切换牵涉的 节点。 如果， 在对 PBB-TE 网络中的局部区域进行保护切换时， 能在不同 状态检测的场景下选择相适应的保护切换机制， 则釆用选定的最合适的保 护切换机制， 必定能尽快实现保护倒换， 从而提高故障恢复的速度， 减少 保护倒换的节点， 有利于网络的优化， 并且保证端到端流量的可靠性。 然 而， 目前并不存在这样的解决方案。 发明内容
有鉴于此， 本发明的主要目的在于提供一种分段保护中的切换方法及 系统， 提高了故障恢复的速度， 减少了保护倒换的节点， 有利于网络的优 化， 并且保证端到端流量的可靠性。
为达到上述目的， 本发明的技术方案是这样实现的：
一种分段保护中的切换方法， 该方法包括：
选择一组流量工程服务实例（TESI ), 作为设置的分段保护域的被保护 对象；
在所述分段保护域中设置工作段和保护段， 并对所述工作段和所述保 护段进行状态检测；
在不同的状态检测或者保护倒换请求下， 根据当前的保护切换机制实 现 TESI所在链路的保护倒换。
其中， 所述 TESI所在的物理链路属于运营商骨干桥接技术（ PBB-TE ) 网络中的局部区域； 所述 TESI能传输通过所述工作段和所述保护段的每个 网段与中间节点；
工作段和保护段具有两个公共的端节点； 工作段和保护段被包含在 PBB-TE的路径之内； 工作段和保护段的端节点与所述 PBB-TE的端节点重 合或不重合。
其中， 进行所述状态检测具体包括： 在工作段的两个端节点上进行持 续地状态检测、 或在保护段的两个端节点上进行持续地状态检测。
其中， 所述状态检测具体为工作段无故障；
实现所述保护倒换具体包括： 分段保护域的端节点将被保护 TESI的出 端口选择在工作段上， 被保护 TESI的流量通过工作段传输。
其中， 所述状态检测具体为工作段出现故障， 且保护段无故障； 实现所述保护倒换具体包括： 分段保护域的端节点将被保护 TESI的出 端口选择在保护段上， 被保护 TESI的流量通过保护段传输。
其中， 所述状态检测具体为工作段故障恢复， 保护段无故障， 且分段 保护域设置为非返回模式；
实现所述保护倒换具体包括： 分段保护域的端节点保持将被保护 TESI 的出端口选择在保护段上， 被保护 TESI的流量通过保护段传输。
其中， 所述状态检测具体为工作段故障恢复， 保护段无故障， 且分段 保护域设置为返回模式；
实现所述保护倒换具体包括： 分段保护域的端节点等待直至达到故障 确定已经恢复的时间后， 将被保护 TESI的出端口选择在工作段上， 被保护 TESI的流量通过工作段传输。
一种分段保护中的切换系统， 该系统包括： 选择单元、 设置单元、 状 态检测单元和保护切换实现单元； 其中，
选择单元，用于选择一组 TESI,作为设置的分段保护域的被保护对象； 设置单元， 用于设置分段保护域， 以及在所述分段保护域中设置工作 段和保护段；
状态检测单元， 用于对所述工作段和所述保护段进行状态检测； 保护切换实现单元， 用于在不同的状态检测或者保护倒换请求下， 根 据当前的保护切换机制实现 TESI所在链路的保护倒换。
其中， 状态检测单元， 进一步用于在工作段的两个端节点上进行持续 地状态检测、 或在保护段的两个端节点上进行持续地状态检测。
其中， 保护切换实现单元， 进一步用于在所述状态检测具体为工作段 无故障的情况下，分段保护域的端节点将被保护 TESI的出端口选择在工作 段上， 被保护 TESI的流量通过工作段传输； 或者，
保护切换实现单元， 进一步用于在所述状态检测具体为工作段出现故 障， 且保护段无故障的情况下， 分段保护域的端节点将被保护 TESI的出端 口选择在保护段上， 被保护 TESI的流量通过保护段传输； 或者，
保护切换实现单元， 进一步用于在所述状态检测具体为工作段故障恢 复， 保护段无故障， 且分段保护域设置为非返回模式的情况下， 分段保护 域的端节点保持将被保护 TESI的出端口选择在保护段上， 被保护 TESI的 流量通过保护段传输； 或者，
保护切换实现单元， 进一步用于所述状态检测具体为工作段故障恢复， 保护段无故障， 且分段保护域设置为返回模式的情况下， 分段保护域的端 节点在等待直至达到故障确定已经恢复的时间后，将被保护 TESI的出端口 选择在工作段上， 被保护 TESI的流量通过工作段传输。
本发明设置分段保护域，并选择一组 TESI作为分段保护域的被保护对 象； 在分段保护域中设置工作段和保护段， 并对工作段和保护段进行状态 检测； 在不同的状态检测或者保护倒换请求下， 根据当前的保护切换机制 实现 TESI所在链路的保护倒换。
釆用本发明， 能在不同状态检测或者保护倒换请求下选择相适应的保 护切换机制来实现保护切换， 由于能可选的釆用选定的最合适的保护切换 机制， 因此， 能尽快实现保护倒换， 从而提高故障恢复的速度， 减少保护 倒换的节点， 有利于网络的优化， 并且保证端到端流量的可靠性。 附图说明
图 1为现有技术 PBB-TE网络中端到端保护机制的示意图；
图 2为现有技术 PBB-TE网络保护切换后的流量示意图；
图 3为本发明方法的实现流程示意图；
图 4为本发明分段保护机制的示意图；
图 5为本发明分段保护切换后的流量示意图。 具体实施方式
本发明的基本思想是： 设置分段保护域， 并选择一组 TESI作为分段保 护域的被保护对象； 在分段保护域中设置工作段和保护段， 并对工作段和 保护段进行状态检测； 在不同的状态检测或者保护倒换请求下， 根据当前 的保护切换机制实现 TESI所在链路的保护倒换。
下面结合附图对技术方案的实施作进一步的详细描述。
如图 3 所示， 一种分段保护中的切换方法， 其特征在于， 该方法包括 以下步骤：
步骤 101、 设置分段保护域， 并选择一组 TESI作为分段保护域的被保 护对象。
步骤 102、在分段保护域中设置工作段和保护段， 并对工作段和保护段 进行状态检测。
这里， 进行状态检测具体包括： 在工作段的两个端节点上进行持续地 状态检测； 在保护段的两个端节点上进行持续地状态检测。 需要指出的是： 工作段的检测和保护段的检测， 两者之间是独立的， 并没有时间上明确的 先后关系。
其中， 对工作段和保护段的检测都可以釆用 IEEE 802.1ag中定义的故 障检测机制， 比如通过沿工作隧道和备份隧道互相发送连通性检查消息 ( CCM, Continuity Check Message )来检测。
步骤 103、在不同的状态检测或者保护倒换请求下，根据当前的保护切 换机制实现 TESI所在链路的保护倒换。
这里，保护倒换可以为 TESI所在故障链路的重定向或恢复重定向的保 护倒换。通常，作为被保护对象的 TESI承载在工作段上， 当工作段故障时， 会将工作段上的 TESI重定向到保护段上。 或者， 当工作段恢复正常时， 将 保护段上的 TESI恢复重定向到工作段上。
这里， TESI所在的物理链路属于 PBB-TE网络中的局部区域； TESI能 传输通过工作段和保护段的每个网段与中间节点。
工作段和保护段具有公共的两个端节点； 工作段和保护段被包含在 PBB-TE的路径之内； 工作段和保护段的端节点与 PBB-TE的端节点重合、 或不重合。
以下对不同状态检测的场景下， 步骤 103的具体处理过程进行阐述。 方案一： 场景为工作段无故障的情况。
此时， 实现保护倒换具体为： 分段保护域的端节点将被保护 TESI的出 端口选择在工作段上， 被保护 TESI的流量通过工作段传输。
方案二： 场景为工作段出现故障， 且保护段无故障的情况。
此时， 实现保护倒换具体为： 分段保护域的端节点将被保护 TESI的出 端口选择在保护段上， 被保护 TESI的流量通过保护段传输。
方案三： 场景为工作段故障恢复， 保护段无故障， 且分段保护域设置 为非返回模式的情况。
此时， 实现保护倒换具体为： 分段保护域的端节点保持将被保护 TESI 的出端口选择在保护段上， 被保护 TESI的流量通过保护段传输。
方案四： 场景为工作段故障恢复， 保护段无故障， 且分段保护域设置 为返回模式的情况。
此时， 实现保护倒换具体为： 分段保护域的端节点在等待一段时间后， 将被保护 TESI的出端口选择在工作段上， 被保护 TESI的流量通过工作段 传输。 其中， 针对上述等待的一段时间而言， 即为： 等待直至达到故障确 定已经恢复的时间。 是为了防止链路恢复后重新故障， 导致频繁的保护倒 换， 因此这段时间是一个经验值， 通常可以从秒级到分钟级。
综上所述， 本发明引入了针对不同场景下的保护机制选择， 来实现不 同场景下针对性的保护倒换， 包括： 预先设定一个分段保护域， 或者简称 保护域， 指定分段保护域所保护的一组 TESI。 指定分段保护域的工作段和 保护段。 在工作段和保护段上进行状态检测。 当工作段无故障时， 分段保 护域的端节点选择工作段为被保护 TESI的传输路径；当工作段出现故障时， 且保护段无故障时，分段保护域的端节点选择保护段为被保护 TESI的传输 路径； 当工作段故障恢复时， 且保护段无故障时， 分段保护域的端节点根 据当前模式为返回或者非返回模式选择工作段或者保护段为被保护 TESI的 传输路径。
从本发明提供的技术方案可以看出， 在 PBB-TE 的网络中， 确定出分 段保护域， 并在确定出的分段保护域中设置工作段和保护段。 当该工作段 路径发生故障时， 只是将该工作段路径的流量切换到其保护段路径上， 而 不是进行全路径的切换， 这样提高了故障恢复的速度， 并减少了保护倒换 涉及的节点。 而且， 可以在不同状态检测的场景下选择相适应的保护切换 机制来实现保护切换， 本发明这种可选的釆用选定的最合适的保护切换机 制的方案， 更有利于网络的优化， 并且保证了端到端流量的可靠性。 另外 在故障恢复时， 本发明提供了两种模式提供切换， 即非返回模式和返回模 式， 非返回模式可以防止在回切时流量丟失， 返回模式可以用于工作段路 径优于保护段路径的场景。 综上所述， 釆用本发明， 能够提高故障恢复的 速度， 减少保护倒换的节点， 有利于网络的优化， 并且保证端到端流量的 可靠性。
以下对本发明进行举例阐述。
方法实施例：
在 PBB-TE的网络中， 本实例实现切换的流程包括以下步骤： 步骤 201 : 选择一个区域被分段保护域所保护， 在分段保护域中设置工 作段和保护段.
这里， 这个被保护的区域是 PBB-TE 网络中的一部分网络， 可以称为 局部区域， 也可以称为段或者分段网络， 是预先根据网络的实际情况确定 出来的， 比如特别脆弱或者特别重要的某些段可以设置为分段区域。 本文 中分段网络的保护也可以称为： 局部区域保护、 或者区域保护； 还可以称 为段保护、 或者分段保护， 还可以有其他类似的名称。
这里， 工作段和保护段的末端分别有两个端节点， 工作段和保护段的 两个端节点是重合的。 在入端节点上设置有工作段端口和保护段端口， 在 出端节点上设置有工作段端口和保护段端口。
这里， 工作段和保护段上的节点中预先设置流量转发的地址表。 具体 的设置方法属于本领域技术人员管用技术手段， 这里不再赘述。
步骤 201 强调的是在基于 PBB-TE的网络中， 确定出需要进行保护的 局部网络， 并在确定出的局部网络中设置工作段和保护段。 其中局部网络 可以是一个或一个以上， 具体数量与实际需要进行保护的情况有关。
步骤 202: 在分段保护域中设置被保护的 TESI。
这里， 当分段保护域进行切换时， 只会切换被本分段保护域所保护的 TESI的流量， 而不会切换不被本分段保护域所保护的 TESI的流量。
步骤 203:在工作段的两个端节点上实施 IEEE 802. lag中定义的故障检 测机制持续地对工作段进行状态检测； 在保护段的两个端节点上实施 IEEE 步骤 204: 当工作段无故障时， 分段保护域的端节点将被保护 TESI的 出端口选择在工作段上， 被保护 TESI的流量通过工作段传输。
步骤 205: 当工作段出现故障时， 如果保护段无故障， 分段保护域的端 节点将被保护 TESI的出端口选择在保护段上， 被保护 TESI的流量通过保 护段传输。
这里， 通过分段保护， 在工作段出现故障时， 被保护的 TESI的流量能 够立即切换到保护段上， 保障了被保护的业务流量的快速恢复， 防止了由 于工作段故障导致的网络严重中断。
步骤 206: 当工作段故障恢复， 且保护段无故障时， 如果分段保护域设 置为非返回模式， 则进入步骤 207 , 否则进入步骤 208。 步骤 207: 分段保护设置为非返回模式， 则分段保护域的端节点保持将 被保护 TESI的出端口选择在保护段上， 被保护 TESI的流量通过保护段传 输。
这里， 如果分段保护域设置为非返回模式， 则工作段恢复后， 被保护 的流量不需要回切， 防止了由于分段保护回切导致的业务丟失。
步骤 208: 分段保护设置为返回模式， 则分段保护域的端节点在等待一 段时间后， 将被保护 TESI的出端口选择在工作段上， 被保护 TESI的流量 通过工作段传输。
这里， 如果分段保护域设置为返回模式， 尤其适用于工作段路径优于 保护段路径的情况， 则当工作段恢复后， 被保护的流量回切， 可以使得流 量继续在较优路径上传输。
下面结合一实例， 对本发明方法进行具体描述。
图 4为本发明的 PBB-TE网络分段保护机制的结构示意图， 如图 4所 示， PE1-P1-P2-P3-PE2为某基于 PBB-TE技术的网络的流量传输实体， PE1 和 PE2 为端节点。 假设, P1-P2-P3 为本实施例中分段保护域的工作段， P1-P4-P3 为本实施例中分段保护域的保护段， 工作段和保护段有相同的端 节点 P 1和 P3。 数据帧从 PE 1节点向基于 PBB-TE技术的网络中传输时 , 数据帧的 B-MAC中的源地址为 PE1 的节点 MAC地址， 目的地址为 PE2 的节点 MAC地址， B-VID为该流量传输实体上预先配置的 VLAN, 比如这 里假设为 VID1 ,这个流量的传输实例为 TESI1。在分段保护域中，配置 TESI1 为被保护的 TESI。
分别用 IEEE 802.1ag中定义的故障检测机制持续的对工作段和保护段 进行状态检测， 当检测结果显示工作段上的路径为正常时， 分段保护域的 端节点将被保护 TESI的出端口选择在工作段上，被保护的流量通过工作段 传输， 如图 4所示。 如图 5所示， 图 5为本发明 PBB-TE网络中分段保护域发生保护切换 后的流量示意图。 当检测结果显示工作段发生故障时， 如果保护段无故障， 分段保护域的端节点将被保护 TESI的出端口切换到保护段上，被保护的流 量通过保护段传输。
当工作段故障恢复， 且保护段无故障时， 如果分段保护域设置为非返 回模式，则分段保护域的端节点保持将被保护 TESI的出端口选择在保护段 上，被保护 TESI的流量通过保护段传输,被保护的流量不需要回切， 防止了 由于分段保护回切导致的业务丟失。 如果分段保护设置为返回模式， 则分 段保护域的端节点在等待一段时间后，将被保护 TESI的出端口选择在工作 段上， 被保护 TESI的流量通过工作段传输。
一种分段保护中的切换系统， 该系统包括： 选择单元、 设置单元、 状 态检测单元和保护切换实现单元。 其中， 选择单元， 用于选择一组 TESI, 作为设置的分段保护域的被保护对象。 设置单元， 用于设置分段保护域， 以及在分段保护域中设置工作段和保护段， 并将设置的工作段和保护段通 知状态检测单元。 状态检测单元， 用于对工作段和保护段进行状态检测， 并将状态检测场景通知保护切换实现单元。 保护切换实现单元， 用于在不 同的状态检测或者保护倒换请求下，根据当前的保护切换机制实现 TESI所 在链路的保护倒换。
这里， 状态检测单元， 进一步用于在工作段的两个端节点上进行持续 地状态检测、 在保护段的两个端节点上进行持续地状态检测。
这里， 保护切换实现单元基于不同的状态检测的场景， 具体实现各有 不同， 以下具体阐述。
具体实现的方案一： 保护切换实现单元， 进一步用于在状态检测的场 景具体为： 工作段无故障的情况下， 分段保护域的端节点将被保护 TESI的 出端口选择在工作段上， 被保护 TESI的流量通过工作段传输。 具体实现的方案二： 保护切换实现单元， 进一步用于在状态检测的场 景具体为： 工作段出现故障， 且保护段无故障的情况下， 分段保护域的端 节点将被保护 TESI的出端口选择在保护段上， 被保护 TESI的流量通过保 护段传输。
具体实现的方案三： 保护切换实现单元， 进一步用于在状态检测的场 景具体为： 工作段故障恢复， 保护段无故障， 且分段保护域设置为非返回 模式的情况下，分段保护域的端节点保持将被保护 TESI的出端口选择在保 护段上， 被保护 TESI的流量通过保护段传输。
具体实现的方案四： 保护切换实现单元， 进一步用于状态检测的场景 具体为： 工作段故障恢复， 保护段无故障， 且分段保护域设置为返回模式 的情况下， 分段保护域的端节点在等待一段时间后， 将被保护 TESI的出端 口选择在工作段上， 被保护 TESI的流量通过工作段传输。 其中， 针对上述 等待的一段时间而言， 即为： 等待直至达到故障确定已经恢复的时间。 是 为了防止链路恢复后重新故障， 导致频繁的保护倒换， 因此这段时间是一 个经验值， 通常可以从秒级到分钟级。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种分段保护中的切换方法， 其特征在于， 该方法包括：
选择一组流量工程服务实例（TESI ), 作为设置的分段保护域的被保护 对象；
在所述分段保护域中设置工作段和保护段， 并对所述工作段和所述保 护段进行状态检测；
在不同的状态检测或者保护倒换请求下， 根据当前的保护切换机制实 现 TESI所在链路的保护倒换。
2、 根据权利要求 1所述的方法， 其特征在于， 所述 TESI所在的物理 链路属于运营商骨干桥接技术（PBB-TE ) 网络中的局部区域； 所述 TESI 能传输通过所述工作段和所述保护段的每个网段与中间节点；
所述工作段和所述保护段具有两个公共的端节点； 工作段和保护段被 包含在 PBB-TE的路径之内；工作段和保护段的端节点与所述 PBB-TE的端 节点重合或不重合。
3、 根据权利要求 1或 2所述的方法， 其特征在于， 进行所述状态检测 具体包括： 在工作段的两个端节点上进行持续地状态检测、 或在保护段的 两个端节点上进行持续地状态检测。
4、 根据权利要求 1或 2所述的方法， 其特征在于， 所述状态检测具体 为工作段无故障；
实现所述保护倒换具体包括： 分段保护域的端节点将被保护 TESI的出 端口选择在工作段上， 被保护 TESI的流量通过工作段传输。
5、 根据权利要求 1或 2所述的方法， 其特征在于， 所述状态检测具体 为工作段出现故障， 且保护段无故障；
实现所述保护倒换具体包括： 分段保护域的端节点将被保护 TESI的出 端口选择在保护段上， 被保护 TESI的流量通过保护段传输。
6、 根据权利要求 1或 2所述的方法， 其特征在于， 所述状态检测具体 为工作段故障恢复， 保护段无故障， 且分段保护域设置为非返回模式； 实现所述保护倒换具体包括： 分段保护域的端节点保持将被保护 TESI 的出端口选择在保护段上， 被保护 TESI的流量通过保护段传输。
7、 根据权利要求 1或 2所述的方法， 其特征在于， 所述状态检测具体 为工作段故障恢复， 保护段无故障， 且分段保护域设置为返回模式；
实现所述保护倒换具体包括： 分段保护域的端节点等待直至达到故障 确定已经恢复的时间后， 将被保护 TESI的出端口选择在工作段上， 被保护 TESI的流量通过工作段传输。
8、 一种分段保护中的切换系统， 其特征在于， 该系统包括： 选择单元、 设置单元、 状态检测单元和保护切换实现单元； 其中，
选择单元，用于选择一组 TESI,作为设置的分段保护域的被保护对象； 设置单元， 用于设置分段保护域， 以及在所述分段保护域中设置工作 段和保护段；
状态检测单元， 用于对所述工作段和所述保护段进行状态检测； 保护切换实现单元， 用于在不同的状态检测或者保护倒换请求下， 根 据当前的保护切换机制实现 TESI所在链路的保护倒换。
9、 根据权利要求 8所述的方法， 其特征在于， 状态检测单元， 进一步 用于在工作段的两个端节点上进行持续地状态检测、 或在保护段的两个端 节点上进行持续地状态检测。
10、 根据权利要求 8或 9所述的方法， 其特征在于， 保护切换实现单 元， 进一步用于在所述状态检测具体为工作段无故障的情况下， 分段保护 域的端节点将被保护 TESI的出端口选择在工作段上， 被保护 TESI的流量 通过工作段传输； 或者，
保护切换实现单元， 进一步用于在所述状态检测具体为工作段出现故 障， 且保护段无故障的情况下， 分段保护域的端节点将被保护 TESI的出端 口选择在保护段上， 被保护 TESI的流量通过保护段传输； 或者，
保护切换实现单元， 进一步用于在所述状态检测具体为工作段故障恢 复， 保护段无故障， 且分段保护域设置为非返回模式的情况下， 分段保护 域的端节点保持将被保护 TESI的出端口选择在保护段上， 被保护 TESI的 流量通过保护段传输； 或者，
保护切换实现单元， 进一步用于所述状态检测具体为工作段故障恢复， 保护段无故障， 且分段保护域设置为返回模式的情况下， 分段保护域的端 节点在等待直至达到故障确定已经恢复的时间后，将被保护 TESI的出端口 选择在工作段上， 被保护 TESI的流量通过工作段传输。
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