CN100531075C - Method for monitoring sub-layer via EXP field identifier - Google Patents

Method for monitoring sub-layer via EXP field identifier Download PDF

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CN100531075C
CN100531075C CN 200710149852 CN200710149852A CN100531075C CN 100531075 C CN100531075 C CN 100531075C CN 200710149852 CN200710149852 CN 200710149852 CN 200710149852 A CN200710149852 A CN 200710149852A CN 100531075 C CN100531075 C CN 100531075C
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oam
monitoring
sublayer
tcm
sub
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CN 200710149852
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CN101127646A (en )
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杨祖发
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中兴通讯股份有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/50Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]

Abstract

本发明涉及使用EXP字段标识监视子层的方法,包括:步骤A:启用多协议标记交换网络标记交换通道的监视子层功能时,监视子层入口标记交换路由器生成并向前发送操作维护与管理OAM标记分组,OAM标记分组的协议数据单元仅包含一个标记条目,标记条目的EXP字段用于标识监视子层;步骤B:监视子层出口标记交换路由器识别并处理OAM标记分组,如果接收的OAM协议数据单元包含的EXP属于当前监视子层的映射值,处理该OAM协议数据单元净荷,并终止该OAM标记分组继续向前转发,否则,直接向前转发接收的OAM标记分组。 The present invention relates to a method of monitoring the EXP field identifies the sub-layer, comprising: Step A: When enabled multi-protocol label switching network monitoring sublayer functions label switching path, monitoring sublayer inlet LSR generates and transmits a forward operation and maintenance management marker OAM packet, labeled packet OAM protocol data units contains only one tag entry, mark the entry field to identify the EXP monitoring sublayer; step B: monitoring sublayer outlet LSR marker recognizing and processing OAM packet, if the received OAM EXP protocol data unit comprising a part of the current map value monitoring sublayer OAM processing the protocol data unit payload, and terminates the OAM packet marking continues onward forwarding, otherwise, mark the packet and forwards the received OAM forward. 本发明避免了采用标记堆叠方式浪费MPLS路径带宽资源的弊端,增加了网络传送客户信息的能力。 The present invention avoids the disadvantages of using labeled stacking MPLS path bandwidth resource waste, increase the transmission capacity of the network of customer information.

Description

使用EXP字段标识监视子层的方法 The EXP field identifies the method of monitoring sublayer

技术领域 FIELD

本发明涉及一种使用EXP字段标识监视子层的方法,尤其涉及分组交换网络技术领域中,多协议标记交换MPLS (Multi-Protocol Label Switching) 层网络中,使用EXP字段标识子网连接监视子层和串联连接监视子层的方法。 The present invention relates to a method for monitoring the EXP field identifies the sub-layer, and particularly to a packet switched network art, multi-protocol label switching MPLS (Multi-Protocol Label Switching) network layer, the EXP field identifies the subnetwork connection monitoring sublayer the method of monitoring and tandem connection sub-layer.

背景技术 Background technique

多协议标记交换MPLS (Muiti-Protocol Label Switching) 4支术是一种结合了二层交换和三层路由的集成数据传输技术,能够支持网络层的多种协议,还可以兼容第二层的多种链路层技术。 Multiprotocol Label Switching MPLS (Muiti-Protocol Label Switching) 4 branched integration technique is a combination of data transmission and switching technologies Layer three routing protocols to support multiple network layer, the second layer is also compatible with multiple seed link layer. 采用MPLS技术的因特网协议IP (Internet Protocol) 3各由器以及异步转移才莫式ATM ( Asynchronous Transfer Mode)、帧中继FR (Frame Relay)交换机统称为标记交换路由器LSR (Label SwitchRouter)。 MPLS technology using an Internet Protocol IP (Internet Protocol) 3 and each consist of an asynchronous transfer before Morse ATM (Asynchronous Transfer Mode), Frame Relay FR (Frame Relay) switch collectively referred to as Label Switch Router LSR (Label SwitchRouter). 在由LSR组成的MPLS凄史据传输网络中,由于客户信息通过已知的连接进行转发,相对简化了网络层的复杂度,降低了网络升级的成本。 In MPLS LSR composition of sad history data transmission network, since the client information is forwarded by known connection, relative simplifies the complexity of the network layer, reducing the cost of network upgrade. 因此,在全球范围内,MPLS技术在核心网络得到了大规模应用。 Therefore, on a global scale, MPLS technology in the core network has been large-scale application.

结合端到端伪线仿真PWE3 (Pseudo Wire Emulation Edge-to-Edge)技术和MPLS隧道技术,MPLS交换网络可以支持链路层以及更低层次客户信息的传送,包括以太网ETH (Ethernet)、异步转移才莫式ATM、帧中继FR、 结构化和非结构化的时分复用和复用器TDM (Time Division Multiplex and Multiplexer)等。 Binding pseudo wire emulation end PWE3 (Pseudo Wire Emulation Edge-to-Edge) and MPLS tunneling, MPLS switched network may support lower level and transmitting the customer information link layer, including Ethernet ETH (Ethernet), asynchronous transfer was Mohs ATM, Frame Relay FR, structured and unstructured time division multiplexing and a multiplexer TDM (Time Division multiplex and multiplexer) and the like. 这进一步地扩大了MPLS技术的应用范围,^使得MPLS网络不仅能够应用在核心网络环境,也可以应用在汇聚和接入网络环境。 This further expands the range of applications of MPLS technology, ^ MPLS network such that not only can be used in the core network environment, and can also be applied in the access converged network environment.

为便于提高MPLS网络连接的生存能力和可维护性,国际电信联盟-电孑言才示-隹部ITU-T (International Telecommunication Union-Telecommunication Standardization Sector)组织已经为MPLS网络定义并制定了标记交换通道LSP (Label Switched Path)端到端的操作、维护与管理OAM (Operation, In order to facilitate maintainability and improve the viability of MPLS network is connected, the International Telecommunication Union - shown only made electrically larvae - radical 172 ITU-T (International Telecommunication Union-Telecommunication Standardization Sector) organization has developed an MPLS network definition label switching path and LSP (Label Switched Path) end of the operation, maintenance and management OAM (operation,

4Administration and Maintenance)功能和机制,用于实现MPLS层网络路径的故障管理和性能监视,并根据检测结果建立不同的告警状态。 4Administration and Maintenance) functions and mechanisms for achieving fault management and performance monitoring of the MPLS layer network paths, and the establishment of different alarm conditions based on the detection result. 当MPLS 网络支持基于路径的线性保护功能时,LSP端到端的OAM功能建立的故障条件可作为路径保护倒换的依据。 When the network supports MPLS-based linear protection path LSP-end OAM fault condition may be established as a function based path protection switching.

ITU-T还为MPLS网络定义了串联连接监视TCM (Tandem Connection Monitoring)子层功能,但目前没有制定相应的实现机制。 ITU-T also defines a tandem connection monitoring TCM (Tandem Connection Monitoring) sublayer functions, but there is no corresponding mechanism for MPLS networks implemented. 所述子层,是指嚢括在一个层网络中的一套附加传送处理功能和参考点。 The sub-layer is a layer comprising a further conveying Nang processing functions and a reference point on the network layer. 它是通过分解传送处理功能或参考点而形成的。 It is transmitted by the decomposition process function or reference points is formed. 所述串联连接,是指任意一组邻接的"链路连接"和/或"子网络连接"。 The series connection, refers to any of a group of contiguous "link connected" and / or "sub network connection." 所述子网络,是指用于实现特殊特征信息的路由安排的一种拓朴构件。 The sub-network, topology refers to a specific component for realizing the feature information routing arrangements. 子网络存在于单个层网络之中,它由可用来传递特征信息的一组端口确定。 Sub-network exists in a single layer network, it can be used to deliver a set of ports by the characteristic information is determined. 子网络边界上的各端口之间的关联可由层网络的管理处理来构成和断开,从而改变它的连接性。 Association between ports on each sub-network boundary layer network management processing may be configured and off, to change its connectivity. 当子网络连接建立后,通过这些端口与子网络连接的输入和输出的结合也就生成了参考点。 When the sub-network connection is established, in conjunction with input and output ports are connected through these subnetworks also generated with the reference point. 一般而言,子网路可分块为由链路互连的更小的子网络;矩阵是子网络的一种特殊情况,它不能分块。 In general, the web can be divided into sub-blocks that are smaller sub-networks interconnected by links; matrix is ​​a special case of sub-networks, it can not block. 所述子网络连接,是指一种跨越由子网络的边界上的各"端口"的关联而形成的子网络来传递信息的"传送实体"。 The sub-network connection, refers to a sub-network spans associated with each of the "port" on the boundary of the sub-network to transmit information formed by the "transport entity."

子网络连接能够穿越子网络透明地传递信息。 Sub-network connection can be passed transparently through the sub-network information. 它由子网络边界上的连接 It is connected by a sub-network on boundaries

点划定界限,表示这些连接点之间的关联。 Delimitation point, represents an association between these connection points. 当子网络连接建立后,通过这些端口与子网络连接的输入和输出的结合也就生成了参考点。 When the sub-network connection is established, in conjunction with input and output ports are connected through these subnetworks also generated with the reference point. 一般而言,子网 In general, the subnet

络连接由子网络连接和链路连接的级联构成。 Network connection is constituted by cascade connection and a sub-network links. 矩阵连接是子网络连接的特殊情况,它由单个(不可分的)子网络连接构成。 Connection matrix is ​​a special case of sub-network is connected, which consists of a single (non-separable) constituting a sub network connection.

TCM子层用于部分LSP或MPLS子网连接的故障管理和性能监视。 TCM sublayer performance monitoring and fault management for the part or MPLS LSP subnets. MPLS网络的一条LSP可以配置多个TCM子层,但不允许TCM子层之间出现重叠。 An LSP MPLS network may configure the plurality of TCM sub-layer, but not overlap occurs between TCM sublayer. 通常情况下,TCM子层应用在MPLS层网络同一管理域边界LSR 之间或相邻管理域的邻接边界LSR之间。 Typically, TCM sub-layer between the application layer of the same administrative domain MPLS LSR LSR boundary between the adjacent network or adjacent management domains.

MPLS网络启用TCM子层功能之后,可以基于子网连接建立告警条件。 After MPLS network enable the TCM sub-layer functions, you can create an alarm condition based subnetwork connection. 如果MPLS网络支持基于MPLS子网连接的保护功能,可以将TCM子层产生的故障条件作为子网连接保护倒换的依据。 If the MPLS network supports MPLS subnetwork connection protection function, a fault condition may be generated as the TCM sublayer based subnetwork connection protection switching. 不难看出,启用TCM子层功能之后,MPLS网络的生存能力和可维护性得到进一步加强。 After not difficult to see, TCM sublayer function is enabled, MPLS network survivability and maintainability has been further strengthened.

5MPLS网络并不限制分组头部的标记栈深度,因此,通常选择为TCM 子层增加新的MPLS垫层实现相应功能。 5MPLS network does not limit the depth of the label stack of the packet header, therefore, is usually selected to add new functionality to achieve the corresponding MPLS cushion TCM sublayer. 对于这种实现方式,当LSP存在嵌套的TCM子层时,串联连接监视的端对端操作、维护与管理协议数据单元TCM OAM PDU (Protocol Data Unit)将包含多层标记条目。 For this implementation, when the presence of nested LSP TCM sub-layer, tandem connection monitoring the end to end operation, maintenance and management protocol data unit TCM OAM PDU (Protocol Data Unit) comprising a multilayer mark entry. 过深的标记栈将增加MPLS层网络的路径开销,降低网络传送客户信息的能力。 Too deep mark stack will increase the cost of the path MPLS layer network, reducing the network transmission capacity of customer information.

发明内容 SUMMARY

本发明要解决的技术问题是提供一种使用EXP字段标识监视子层的方法。 The present invention is to solve the technical problem of providing a method for monitoring the EXP field identifies the sub-layer.

为了解决上述问题,本发明提供了一种使用EXP字段标识监视子层的方法,包括如下步骤: To solve the above problems, the present invention provides a method of monitoring the EXP field identifies the sub-layer, comprising the steps of:

步骤A:启用多协议标记交换网络标记交换通道的监视子层功能时,所述监^L子层入口标记交换路由器生成并向前发送操作维护与管理OAM标记分组,所述OAM标记分组的协议数据单元仅包含一个标记条目,所述标记条目的EXP字段用于标识所述监视子层; Step A: When monitoring is enabled Multiprotocol Label Switching label switching network function sub-layer channel, the monitoring ^ L sublayer inlet LSR generates and transmits a forward operation and maintenance management OAM packet marker, the marker OAM protocol packet the data unit contains only one tag entry, the tag entry field for identifying the monitoring EXP sublayer;

步骤B:所述监视子层出口标记交换路由器识别并处理所述OAM标记分组,如果接收的OAM协议数据单元包含的EXP属于当前监视子层的映射值,处理该OAM协议数据单元净荷,并终止该OAM标记分组继续向前转发,否则,直接向前转发接收的OAM标记分组。 Step B: monitoring the outlet LSR sublayer recognizing and processing the marker OAM packet, if the received OAM protocol data units belong to the currently contained EXP mapping value monitoring sublayer OAM processing the protocol data unit payload, and terminate the OAM marker packet forwarding to continue forward, otherwise forward them directly forward OAM marks the received packet.

进一步地,所述标记条目的标记值lable为14、 S值为1、生存时间TTL (Time To Live,生存时间)值为1。 Further, the mark entry tag value lable is 14, S is 1, the survival time of TTL (Time To Live, Time to Live) value of 1.

进一步地,属于同一条标记交换通道的多个监视子层,在每监视子层内部,OAM协议数据单元包含的EXP保持唯一。 Further, a plurality of monitors belonging to the same sub-layer mark exchange channels, monitoring within each sub-layer, the OAM protocol data unit included in the EXP unique.

进一步地,当所述监视子层之间存在嵌套关系时,存在嵌套关系的监视子层之间,OAM协议数据单元包含的EXP也保持唯一。 Further, when there is a nesting relationship between the monitoring sub-layer, present between the monitoring sub-nesting relationship, the OAM protocol data unit included in the EXP remains unique.

进一步地,步骤A前还包括:标记交换通道穿过多协议标记交换网络的一个或多个管理域,选择在所述标记交换通道穿过的入口标记交换5^由器和出口标记交换路由器之间、各管理域两个边界标记路由器之间和/或相邻管理域邻接标记路由器之间配置监视子层功能。 Further, before the step A further comprising: a label switched path through the Multiprotocol Label Switching network or a plurality of management domains, selected through the inlet of the label switched path label switching and an outlet 5 ^ a label switching router are disposed between sublayer monitoring function between administrative domains and two boundary markers between routers / or adjacent marker adjacent to the router management domain.

进一步地,所述OAM标记分组的外层标记条目中,LSP-S为O,指示所述OAM标记分组承载的净荷不是客户信息。 Further, the outer tag entries tagged OAM packet, LSP-S is O, indicating that the marker OAM payload is not customer information packet bearer.

进一步地,所述OAM协议数据单元包含的EXP取值范围为0-7。 Further, EXP value range of the protocol data unit contains OAM 0-7.

进一步地,标记交换通道同时启用端到端OAM和监视子层功能时,所述OAM协议数据单元包含的EXP取值范围为1-7。 Furthermore, when a label switched path while monitoring and enable end OAM sublayer functions, EXP value range of the protocol data unit comprising OAM is 1-7.

进一步地,所述标记交换通道是单向或双向的。 Further, the label switched path is unidirectional or bidirectional.

进一步地,对于同一条标记交换通道,最大允许存在8层监^L子层。 Further, for the same label switched path, the maximum allowed level monitor 8 ^ L sublayer.

进一步地,所述监视子层是子网连接监视子层或串联连接监视子层。 Further, the monitoring sub-layer is a sub-network connection monitoring sublayer or TCM sublayer.

本发明提供的一种使用EXP字段标识监视子层的方法,在保证这两种功能实现相对筒单的同时,避免了采用标记堆叠方式浪费MPLS路径带宽资源的弊端,增加了网络传送客户信息的能力。 EXP field identifies the monitor using a sub-layer of the present invention provides a method of ensuring both functions to achieve a relatively single cylinder, while avoiding the disadvantages of using labeled stacking MPLS path bandwidth resource waste, increase the network transmission of customer information ability.

附图说明 BRIEF DESCRIPTION

图1是本发明链路上TCM OAM标记分组结构图; 图2是本发明无TCM子层嵌套时的MPLS网络结构; 图3是本发明含TCM子层嵌套时的MPLS网络结构图。 FIG 1 is a configuration diagram of TCM the OAM packet on the labeled link according to the present invention; FIG. 2 is a configuration when no MPLS network TCM sublayer nested invention; FIG. 3 is a MPLS network according to the present invention having a configuration diagram TCM sublayer nested.

具体实施方式 detailed description

本发明的核心思想是,选择采用OAM PDU标记的EXP字段标识监视子层,所述监视子层可以是是子网连接监视子层或串联连接监视子层。 The core idea of ​​the invention is to select the EXP field identifies the monitor marks sublayer OAM PDU, the monitoring sub-layer may be a subnet connection monitoring sublayer or TCM sublayer.

下面以串联连接监视子层为例,来详细描述本发明的方法。 Below tandem connection monitoring sublayer, for example, the method of the present invention will be described in detail. 启用MPLS 网络LSP的TCM功能时,属于同一条LSP的所有TCM子层,不管是否存在嵌套关系,TCM子层监视的TCM OAM PDU总是具有相同的标记栈深度, 且仅包含一个标记条目,标记值为14, EXP字I臾用于标识TCM子层或子网连接监视子层,S值为1, TTL (Time To Live,生存时间)值为1。 TCM function is enabled when the LSP MPLS network, all belonging to the same LSP TCM sub-layer, regardless of whether there is a nesting relationship, TCM OAM PDU monitored TCM sub-layer always have the same label stack depth, and only contains a tag entry, tag value 14, EXP I Yu word used to identify or TCM sublayer sublayer monitored sub-network connection, S is 1, TTL (time to Live, time to Live) value of 1.

属于同一条LSP的多个TCM子层,如果相互之间不存在嵌套关系,各TCM子层TCMOAMPDU标记的EXP互不相关,仅要求在每TCM子层内部保持唯一,不同TCM子层TCM OAM PDU标i己的EXP可以相同或不同; 对于存在嵌套关系的TCM子层,除了在各TCM子层内部保持TCM OAM PDU标记的EXP唯一之外,存在嵌套关系的各TCM子层之间,TCM OAM PDU标记的EXP也必须保持唯一。 An LSP belonging to the same sub-layers of the plurality of TCM, if there is a nesting relationship with each other, each TCM sub-layer mark TCMOAMPDU EXP unrelated, requires only be unique, different from the OAM TCM TCM sublayer within each TCM sub-layer EXP PDU own index i may be the same or different; TCM sub-layer exists for nesting relationship, in addition to maintaining the OAM PDU TCM labeled unique EXP outside, the presence of each TCM sub-layer nested relationship within each TCM sub-layer between the , TCM OAM PDU labeled EXP must be unique. 由于MPLS标记的EXP字段包含3位二进制数,对于同一条LSP,最大允许存在8层TCM子层。 The MPLS EXP field contains labeled 3-bit binary numbers, with respect to an LSP, the maximum allowed level 8 TCM sublayer.

本发明使用EXP字段标识TCM子层的方法,包括如下步骤: The method of the present invention, the EXP field identifies the TCM sub-layer, comprising the steps of:

步骤一:LSP穿过MPLS层网络的一个或多个管理域,选择在所述LSP 穿过的入口LSR和出口LSR之间、各管理域两个边界LSR之间、相邻管理域邻接LSR之间配置TCM子层功能。 Step a: LSP MPLS layer network through one or more administrative domains, selecting the LSP passes between LSR LSR inlet and an outlet, the boundary between the two domains management LSR, the LSR adjacent neighbor management domain TCM disposed between sublayer functions.

步骤二: TCM子层入口LSR生成并向前发送TCM OAM标记分组。 Step two: TCM sublayer ingress LSR generates and transmits a marker packet TCM OAM forward.

本发明链路上TCM OAM标记分组如图1所示,TCM OAM标记分组格式为:所述LSP在TCM子层入口LSR上的标记条目,TCM OAM PDU。 The present invention TCM uplink packet marking the OAM shown in FIG. 1, TCM OAM packet format labeled as: LSP label entry on the TCM sub-layer of the ingress LSR, TCM OAM PDU. 由LSP-Label、 LSP-EXP、 LSP-S、 LSP-TTL组成的外层标记条目是MPLS 层网络选路标记。 Mark entry by the outer layer LSP-Label, LSP-EXP, LSP-S, LSP-TTL composition is an MPLS layer network routing tag. 如果所述LSP标记条目的S值为1,对于TCMOAM标记分组,必须将其修改为O,指示TCMOAM标记分组承载的净荷不是客户信息。 If the value of LSP label entry S 1, for TCMOAM marked packets, it must be modified is O, not the payload flag indicating TCMOAM customer information packet bearer. 其他字段的赋值处理等同于LSP承载客户信息的标记分组。 Assignment is equivalent to processing other fields labeled packet bearer LSP customer information.

由TCM-Labd、 TCM-EXP、 TCM-S、 TCM-TTL组成的内层标记是TCM OAMPDU的标记条目。 An inner layer denoted by the TCM-Labd, TCM-EXP, TCM-S, TCM-TTL is composed of TCM OAMPDU mark entry. TCM OAM PDU格式为:TCM-Label=14,也就是标记值=14,指示TCM OAM PDU包含OAM信息;TCM-EXP-特定TCM 子层映射值,属于相同TCM子层的所有TCMOAMPDU, TCM-EXP必须唯一。 TCM OAM PDUs format: TCM-Label = 14, i.e. the value tag = 14, indicating TCM OAM OAM PDUs containing information; TCM-EXP- TCM sublayer particular mapping value, belonging to the same TCM sublayer all TCMOAMPDU, TCM-EXP It must be unique. TCM-S=1, TCM-TTL=1, TCM OAM PDU为净荷。 TCM-S = 1, TCM-TTL = 1, TCM OAM PDU payload is.

当所述LSP包含多个TCM子层时,如果TCM子层之间不存在嵌套关系,TCM OAM PDU的EXP只需要在每TCM子层内部保持唯一,不同TCM 子层TCM OAM PDU的EXP可以相同或不同。 When the LSP sub-layers comprising a plurality of TCM, if there is a nesting relationship, between TCM OAM PDU EXP TCM sublayer need only be unique within each TCM sub-layer, the TCM OAM PDU different TCM sublayer may EXP the same or different. 如图2所示,单向LSP-11 穿过两个管理域,共配置了三个TCM子层。 As shown in FIG. 2, unidirectional LSP-11 through two administrative domains, it was equipped with three TCM sublayer. TCM-A监视域A的子网连接, TCM-AB监视相邻域A和B邻接LSR之间的子网连接,TCM-B监视域B 的子网连接。 TCM-A monitoring subnet domain A is connected, TCM-AB monitored sub-network connection between adjacent domains A and B adjacent LSR, monitored TCM-B domain subnet B is connected. 对于TCM-A, TCMOAM标记分组在LSR-ll生成并发送,在LSR-12终结并处理。 For TCM-A, TCMOAM tag generates and transmits packets in the LSR-ll, and termination processing LSR-12. 对于TCM-AB, TCM OAM标记分组在LSR-12生成并发送,在LSR-13终结并处理。 For TCM-AB, TCM OAM packet generating and transmitting the labeled LSR-12, and treated at the end of LSR-13. 对于TCM-B, TCM OAM标记分组在LSR-13 生成并发送,在LSR-14终结并处理。 For TCM-B, TCM OAM packet generating and transmitting the labeled LSR-13, and treated at the end of LSR-14. 由于三个TCM子层之间不存在包含关系,任何TCM子层的TCM OAM标记分组都不会穿过其他TCM子层, 因此,不同TCM子层的TCM-EXP可以相同,也可以不同。 Since there is no relationship between the three TCM containing sublayers, the OAM flag any TCM TCM sub-layer packet will not pass through the other TCM sub-layer, and therefore, TCM-EXP different TCM sublayer may be the same or different.

当TCM子层之间存在嵌套关系,除了要求TCM OAM PDU的EXP在每TCM子层内部保持唯一之外,存在嵌套关系的TCM子层TCM OAM PDU 的EXP也必须保持唯一,也就是存在嵌套关系的子层的TCM OAM PDU的EXP必须不相同。 When there is a nesting relationship between the TCM sub-layer, in addition to the requirements of the TCM OAM PDU EXP remain unique within each TCM sub-layer outside, the nesting relationship exists TCM sublayer of TCM OAM PDU EXP must be unique, that is, the presence of EXP TCM OAM PDU sub-layer does not have the same nesting relationship.

如图3所示,单向LSP-21穿过域C、 D、 E,配置了三个TCM子层。 3, through the unidirectional LSP-21 domain C, D, E, TCM is configured with three sub-layers. TCM-C监视城C的子网连接,TCM-D监视域D的子网连接,TCM-E监视i或E的子网连接。 Monitoring subnet TCM-C C is connected to the city, TCM-D sub-D is connected to monitor the domain, subnet TCM-E i or E is connected to the monitoring.

对于TCM-C, TCM OAM标记分组在LSR-21生成并发送,经过LSR-22、 LSR-23、 LSR-24转发,到达LSR-25之后终结并处理。 For TCM-C, TCM OAM packet generated at the tag, and send LSR-21, through LSR-22, LSR-23, LSR-24 forward, and termination arrival LSR-25 after processing. 对于TCM-D, TCM OAM标记分组在LSR-21生成并发送,到达LSR-22之后终结并处理。 For TCM-D, TCM OAM packet generating and transmitting the labeled LSR-21, and terminated after reaching the process LSR-22. 对于TCM-E, TCM OAM标记分组在LSR-23生成并发送,经过LSR-24转发, 到达LSR-25之后终结并处理。 For TCM-E, TCM OAM packet generated at the tag, and send LSR-23, forward through LSR-24, reaching the end of LSR-25 and subsequent processing. TCM-C完全包容TCM-D和TCM-E,其TCM-EXP必须不同于TCM-D和TCM-E的TCM-EXP,否则,LSR-22和LSR-25将不能正常区分当前终结和处理的TCM OAM标记分组属于哪一个子层。 TCM-C is completely contained TCM-D and the TCM-E, which must be different from TCM-EXP TCM-D TCM-E and the TCM-EXP, otherwise, LSR-22 and LSR-25 will not be able to distinguish between normal and end the current process TCM OAM packets belong to which mark sublayers. TCM-D和TCM-E同为TCM-C的嵌套子层,由于TCM-D的TCM OAM PDU不会穿过TCM-E, TCM-E的TCMOAMPDU也不会穿过TCM-D,因此,TCM-D和TCM-E的TCMEXP可以相同,也可以不同。 TCM-D and with TCM-E nested sublayer TCM-C, since the TCM OAM PDU TCM-D does not pass through the TCM-E, TCM-E TCMOAMPDU not pass through the TCM-D, therefore, TCM-D and the TCMEXP TCM-E may be the same or different.

启用TCM子层功能后,不影响所述LSP端到端OAM标记分组、客户信息标记分组的正常转发和处理。 Enabled TCM sublayer functions, without affecting the LSP-end OAM packet marker, the normal forwarding and handling customer information marked packets. 如果LSP同时启用端到端OAM和TCM 子层功能,TCMOAMPDU的EXP取值范围为1-7;否则,TCMOAMPDU 的EXP取值范围为0-7。 If LSP-end OAM, and enable both TCM sub-layer functions, TCMOAMPDU of EXP in the range of 1-7; otherwise, TCMOAMPDU of EXP in the range of 0-7.

步骤三:TCM子层出口LSR识别并处理TCMOAM标记分组。 Step Three: TCM sub-layer and an egress LSR to identify packet processing TCMOAM tag. 如果接收的TCM OAM PDU包含的EXP属于当前TCM子层的映射值,处理该TCM OAMPDU净荷,并终止TCMOAM标记分组继续向前转发。 If the received TCM OAM PDU comprises the current map value belonging to the EXP TCM sub-layer, the TCM OAMPDUs payload processing, and terminates the packet TCMOAM continue onward forwarding tag. 否则,直接向前转发接收的TCM OAM标记分组。 Otherwise, it forwarded directly ahead TCM OAM marks the received packet.

9如果LSP是双向的,另一方向依然可以根据上述步骤实现TCM子层功能。 9 If the LSP is bidirectional, the direction of still another TCM sublayer functions may be implemented according to the above steps.

嵌套的TCM子层时,不需要为不同TCM子层的TCM OAM PDU净荷添加多层标记条目。 When nested TCM sublayer TCM OAM PDU payload need not be different TCM sublayer adding layers of mark entry. 由于属于同一条LSP的所有TCM OAM标记分组标记栈深度相同,在减少占用有效MPLS网络带宽资源的同时,也相对简化了功能实现的复杂度。 Since all belong to the same packet TCM OAM LSP label stack of the same depth mark in the MPLS network while effectively reducing the occupied bandwidth resources, relatively simplify the complexity of the functions implemented. 任何TCM子层与TCM OAM PDU的EXP之间的映射方法, 凡是使用TCM OAM PDU的EXP判断接收的TCM OAM PDU是否属于当前TCM子层的方法都不违背本发明的原则。 The method of any mapping between the TCM OAM PDU EXP-TCM sublayer, any use of the EXP TCM OAM PDU received TCM OAM PDU determines whether the current method of TCM sublayer is not contrary to the principles of the present invention.

应当理解的是,对本发明所在领域的普通技术人员来说,可以根据本发明的技术方案及其构思进行相应的等同改变或替换,而所有这些改变或替换,都应属于本发明所附权利要求的保护范围。 It should be appreciated that one of ordinary skill in the art where the present invention, the corresponding equivalent may be changed or replaced according to the technical concept and the embodiment of the present invention, and all such changes or substitutions, should belong to the appended claims of the invention the scope of protection.

Claims (11)

  1. 1、一种使用EXP字段标识监视子层的方法,其特征在于包括如下步骤: 步骤A:启用多协议标记交换网络标记交换通道的监视子层功能时,所述监视子层入口标记交换路由器生成并向前发送操作维护与管理OAM标记分组,所述OAM标记分组的协议数据单元仅包含一个标记条目,所述标记条目的EXP字段用于标识所述监视子层; 步骤B:所述监视子层出口标记交换路由器识别并处理所述OAM标记分组,如果接收的OAM协议数据单元包含的EXP属于当前监视子层的映射值,处理该OAM协议数据单元净荷,并终止该OAM标记分组继续向前转发,否则,直接向前转发接收的OAM标记分组。 1, EXP field using a monitoring sublayer identification method, comprising the following steps: Step A: When enabled multi-protocol label switching network monitoring sublayer functions label switched path, said monitoring sublayer generates inlet LSR and forward transmission operation and maintenance management OAM packet marker, the marker OAM packet protocol data unit contains only a tag entry, the tag entry field for identifying the monitoring EXP sublayer; step B: the monitoring sub Label Switch router layer outlet recognizing and processing the marker OAM packet, the EXP OAM protocol if the received data unit includes part of the current map value monitoring sublayer OAM processing the protocol data unit payload, and terminates the OAM packet marking continues to before forwarding, otherwise forward them directly forward OAM marks the received packet.
  2. 2、 如权利要求1所述的方法,其特征在于,所述标记条目的标记值lable为14、 S值为1、生存时间TTL值为1。 2. The method as claimed in claim 1, wherein said marking lable tag value entry is 14, S is 1, the TTL value of 1.
  3. 3、 如权利要求2所述的方法,其特征在于,属于同一条标记交换通道的多个监视子层,在每监视子层内部,OAM协议数据单元包含的EXP保持唯一。 3. The method of claim 2, characterized in that the layers belonging to the same sub-plurality of monitoring label switching path, monitoring within each sub-layer, the OAM protocol data unit included in the EXP unique.
  4. 4、 如权利要求3所述的方法,其特征在于,当所述监视子层之间存在嵌套关系时,存在嵌套关系的监视子层之间,OAM协议数据单元包含的EXP也保持唯一。 4. The method as claimed in claim 3, wherein, when there is a nesting relationship between the monitoring sub-layer, present between the monitoring sub-nesting relationship, the OAM protocol data unit included remains unique EXP .
  5. 5、 如权利要求1至4任一所述的方法,其特征在于,步骤A前还包括:标记交换通道穿过多协议标记交换网络的一个或多个管理域,选择在所迷标记交换通道穿过的入口标记交换路由器和出口标记交换路由器之间、各管理域两个边界标记路由器之间和/或相邻管理域邻接标记路由器之间配置监视子层功能。 5, a method as claimed in any one of the claims 1 to 4, characterized in that, prior to the step A further comprising: a label switched path through the Multiprotocol Label Switching network or a plurality of management domains, the selected channel label switching fans LSR through the inlet and outlet label switching routers disposed between sublayer functions to monitor the management domains of the two boundary markers between routers and / or adjacent marker adjacent to the router management domain.
  6. 6、 如权利要求5所述的方法,其特征在于,所述OAM标记分组的外层标记条目中,LSP-S为0,指示所述OAM标记分组承载的净荷不是客户信息。 6. The method as claimed in claim 5, wherein said outer layer OAM flag entries tagged packet, LSP-S is 0, indicating that the marker OAM payload is not customer information packet bearer.
  7. 7、 如权利要求6所述的方法,其特征在于,所述OAM协议数据单元包含的EXP取值范围为0-7。 7. The method as claimed in claim 6, characterized in that, EXP value range of the protocol data unit contains OAM 0-7.
  8. 8、 如权利要求7所述的方法,其特征在于,标记交换通道同时启用端到端OAM和监视子层功能时,所述OAM协议数据单元包含的EXP取值范围为1-7。 8, A method as claimed in claim 7, wherein the label switched path while monitoring and enable end OAM sublayer functions, EXP value range of the protocol data unit comprising OAM is 1-7.
  9. 9、 如权利要求1至4任一所述的方法,其特征在于,所述标记交换通道是单向或双向的。 9. The method according to any one of claim 1 to claim 4, characterized in that said label switched path is unidirectional or bidirectional.
  10. 10、 如权利要求1所述的方法,其特征在于,对于同一条标记交换通道,最大允许存在8层监视子层。 10. The method as claimed in claim 1, characterized in that, for the same label switched path, the maximum allowed 8-level monitoring sublayer.
  11. 11、 如权利要求l所述的方法,其特征在于,所述监视子层是子网连接监视子层或串联连接监视子层。 11. The method according to claim l, wherein said monitoring sublayer monitored sub-network connection layer or sub TCM sublayer.
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