WO2006039871A1 - Procede pour la transmission de message de commande dans un reseau en boucle a commutation multiprotocole par etiquette - Google Patents

Procede pour la transmission de message de commande dans un reseau en boucle a commutation multiprotocole par etiquette Download PDF

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Publication number
WO2006039871A1
WO2006039871A1 PCT/CN2005/001696 CN2005001696W WO2006039871A1 WO 2006039871 A1 WO2006039871 A1 WO 2006039871A1 CN 2005001696 W CN2005001696 W CN 2005001696W WO 2006039871 A1 WO2006039871 A1 WO 2006039871A1
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Prior art keywords
label
control information
ring
site
switching path
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PCT/CN2005/001696
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English (en)
French (fr)
Inventor
Huaixue Wan
Yuli Shi
Xingyue Quan
Yang Yang
Xixiang Li
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP05806202A priority Critical patent/EP1798912B1/en
Priority to AT05806202T priority patent/ATE549827T1/de
Priority to ES05806202T priority patent/ES2383380T3/es
Publication of WO2006039871A1 publication Critical patent/WO2006039871A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42Loop 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]

Definitions

  • the present invention relates to network communication technologies, and more particularly to a method for transmitting control information in an MPLS ring network.
  • the flexible packet network has become a more economical metropolitan area network (MAN) solution due to the advantages of technologies such as Ethernet, Asynchronous Transfer Mode (ATM) and Synchronous Digital Sequence (SDH). Program.
  • the RPR ⁇ -type ring network is implemented by the topology of the dual-fiber reverse transmission ring.
  • the two fibers forming the network are the inner ring and the outer ring. Since the data packets and control packets can be transmitted simultaneously on the two fibers, the bandwidth utilization of the RPR ring is theoretically doubled compared to the optical transmission network (SDH/SONET).
  • MPLS multi-protocol label switching
  • ITU-T Rec.Y.1711 defines the frame format of the control information in the MPLS ring network.
  • the types of frames include connectivity check (CV), forward defect indication (FDI), backward defect indication (BDI), performance. Messages, loopback requests, and loopback responses.
  • the CV is generated by the source label switching router (LSR), transmitted at 1/second speed, and terminated at the sink LSR.
  • the CV message carries a Network Unique Identifier (TTSI) for detecting network defects.
  • TTSI Network Unique Identifier
  • the FDI packet is used as a response to detect a fault behavior, and is used to suppress an alarm of a layer above layer network that detects an error, and the fault may be a defect from the CV stream or the like.
  • the BDI stream is inserted on the return path (such as a return LSP) to notify the uplink LSR of the defect detected in the sink LSR of the downlink label switched path (LSP).
  • the main object of the present invention is to provide a method for transmitting control information in an MPLS ring network, so that control information can be transmitted more quickly and conveniently in the MPLS ring network.
  • a method for transmitting control information in an MPLS ring network comprising the following steps: a. Allocating a label switching path between a source station and a sink station Labeling, and establishing the label switching path;
  • the source site and the sink site are different sites in the MPLS ring network, and the method for establishing the label switching path in step a is: configuring the allocated label on the source site and the sink site corresponding to the label switching path;
  • the method described in b is:
  • the source station adds the label of the label switching path to the control information message to be sent, and sends the control information message;
  • the site in the MPLS ring network determines whether the control information is the sink site according to the label saved by itself. If not, the control information is directly sent to the next-level site, otherwise the control ends. The information transfer process sends the control information to itself for processing.
  • the source site and the sink site are the same site, and the method for establishing the label switching path in step a is: configuring the allocated label for all the sites on the MPLS ring network where the source site is located, and establishing a ring label switching path of the source site; Then the method described in step b is:
  • the source station adds the label of the ring label switching path to the control information packet to be sent, and sends the control information message.
  • each station in the MPLS ring network determines whether the control information is the source site according to the label saved by itself, and if not, sends the control information to the next-level site. At the same time, the control information is saved in itself, otherwise the control information transmission process ends.
  • the source site is any one of the MPLS ring networks, and the method for assigning labels in step a is:
  • the ring label switching path of each station includes an inner ring and an outer ring.
  • step a different labels are assigned to the inner ring and the outer ring of the ring label switching path.
  • the method for assigning labels in step a is specifically:
  • Step a assigning a label by setting a common ring label switching path for all sites of the MPLS ring network, and assigning a common label for identifying the path;
  • step b21 the source station adds a label of the own site identifier and the label of the common ring label switching path to the control information packet to be sent.
  • each station in the MPLS ring network determines, according to its own site identifier, whether the control information is itself a source site.
  • control information transmission method in the MPLS ring network of the present invention establishes a corresponding dedicated LSP for the control information by setting a label for the control information between different source sites and the sink site, and is configured in the MPLS.
  • the ring network uses the established dedicated LSP to transmit control information point-to-point, making the transmission of control information more convenient and faster.
  • the established dedicated LSP is a ring LSP
  • the control information is handed over to the CPU for processing, and directly to the next one.
  • the level station forwards the control information, thereby speeding up the transmission speed of the control information in the MPLS ring network, and better meeting the time requirement of the protection function of the MPLS ring network.
  • FIG. 1 is a schematic diagram of an LSP established in the first embodiment of the present invention
  • FIG. 2 is a schematic diagram of a ring LSP established in the second embodiment of the present invention
  • FIG. 3 is a schematic diagram of another ring LSP established in the second embodiment of the present invention. Mode for carrying out the invention
  • the control information transmitted in the MPLS ring network is divided into two types.
  • site control information which is transmitted between adjacent sites or across sites, and is used to control service traffic to implement network congestion control and service fairness mechanisms.
  • the second is the complete loop control information that needs to be spread in the full ring, mainly used to complete functions such as topology discovery and ring network service protection.
  • the loop control information is very sensitive to time, so the entire network must be spread in a very short time.
  • Embodiment 1 For the site control information, the information transmission process is as follows -.
  • LSP 1 is used to transmit control information between two adjacent sites, Site A and Site B.
  • LSP1 is bidirectional, and its source site is Site A or Site B. Either another station is a sink site of LSP1; LSP2 is used to transmit control information between Site A and Site C, and intermediate site B exists between Site A and Site C.
  • LSP1 is also Han direction, and its source site can be either site A or site C.
  • the station distinguishes different LSPs by using a label.
  • the tag is a piece of information content that does not contain topology information and has only local significance.
  • Labels are generally set shorter so that they are directly referenced by index.
  • the label value of the LSP can be any, but it should be guaranteed not to overlap with the LSP label of the transport service in the MPLS ring network, or a fixed value is used as the label of the specific LSP, which is used to identify the control information transmitted by the LSP.
  • step a The established LSP bearer transmission is specifically as follows:
  • the transmitting end carries the label of the LSP established in the step al in the control information message and transmits it through the MPLS network, and the receiving end receives the above-mentioned station control information by parsing the label in the control information to implement point-to-point communication.
  • the sender can be any of the above two sites.
  • LSP1 when the site A needs to send control information to the site B, the tag value of the LSP1 is carried on the control information packet, and the MPLS network sends the packet to the site B, and the site B determines the value according to the LSP1 tag value. If the control information is sent to itself, the control information is received for processing.
  • the MPLS network sends control information via Site B. Since Site B does not have the LSP2 tag value configured, Site B transmits the control information directly to Site C. Processing, thereby speeding up the transfer of control information.
  • the method for transmitting the control information of the other sites is similar to the foregoing process, and is sent by the bidirectional LSP bearer established between the source site and the sink site, and details are not described herein again.
  • Embodiment 2 For the whole loop control information, the information transmission process is as follows: A ring LSP is established, and the entire ring control information is carried and transmitted in the data path of the LSP. After receiving the information of the LSP, each station on the ring directly The whole loop control information is forwarded to the next-level site, and the entire loop control information in the data path is forwarded to the CPU for processing. The CPU performs corresponding operations according to the control information, such as completing local topology update, or implementing protection switching.
  • the method for transmitting the ring control information is as follows:
  • A2 Create a set of ring LSPs for source site A, which are inner ring LSP1 and outer ring LSP2.
  • the corresponding label values are assigned to the two ring LSPs, and the label values of LSP 1 and LSP 2 are configured for each site through which the ring LSP passes.
  • the source station A sends the loop control information carrying the LSP1 and/or LSP2 label values through the data path of the LSP.
  • the other stations on the MPLS ring network determine according to the label value set by itself, and the received packet is sent by the LSP.
  • the whole loop control information message is processed by the own loop control information, and the whole loop control information is directly forwarded to the next station.
  • the process is completed by the station's own data forwarding module, and the forwarding delay can be Control is in the microsecond class.
  • the source station A After the whole ring control information is sent back to the source station A by the MPLS ring network, the source station A determines that the LSP carrying the whole ring control information is sent by itself, and terminates the transmission process of the whole ring control information.
  • the remaining sites on the MPLS ring network need to send the entire ring control information to the entire network, they can use the ring LSP bearer established for their own transmission.
  • the method for establishing a ring LSP for the remaining sites is the same as that of source site A, and is not described here.
  • nested labels can be set for the LSP.
  • the nested labels include an outer label and an inner label.
  • the outer label establishes two common inner and outer LSPs. Since the directions of the two common ring LSPs are different, it is necessary to allocate two different outer labels, which are an outer outer ring label and an outer inner ring label, and each station can identify itself with the two outer labels. The direction of the ring LSP used. In addition, each station uses the inner label to identify the whole loop control information transmitted by itself, and the number of inner labels allocated is the number of stations on the MPLS ring network.
  • each site After receiving the information packet, each site determines whether it is the loop control information transmitted by itself according to the inner label value carried in the packet. If yes, the information transmission process ends. Otherwise, the received complete loop control information is reported to the CPU for processing, and the entire loop control information is forwarded to the next station.
  • All the stations use the two ring LSPs established in step a3 to send the complete ring control information, and add its own site identifier in the sent complete ring control information.
  • a site on the MPLS ring network After receiving the entire ring control information transmitted by the LSP, a site on the MPLS ring network determines the location according to the site identifier, and if it is the identity identifier, terminates the transmission process of the entire ring control information, otherwise continues to the next level site. The whole loop control information is forwarded, and the entire loop control information is reported to the CPU, and the CPU performs corresponding processing.
  • the method for transmitting control information in the MPLS ring network of the present invention transmits the control information on the MPLS ring network by establishing a corresponding dedicated LSP for control information between different source sites and sink sites. , making the transmission of control information more convenient and fast.

Description

MPLS环网中控制信息的传送方法
技术领域
本发明涉及网络通信技术 , 尤指一种 MPLS环网中控制信息的传 送方法„ 发明背景
在现有的网络通信中, 弹性分组网 (RPR) 由于具有以太网、 异 步传输模式(ATM)和同步数字序列 (SDH)等技术的优点, 成为一 种较为经济的城域网 (MAN)解决方案。 RPR^—种环型网络, 采用 双纤反向传输环的拓朴结构实现, 构成网络的两根光纤分别为内环 (inner)和外环(outer)。 由于这两根光纤上能同时传送数据分组和 控制分组, 故理论上 RPR环的带宽利用率比光传输网 (SDH/SONET) 提高一倍。
然而, 随着信息网络技术的不断发展以及互联网 (Internet)的快 速普及, 网络信息流的种类、 格式和服务要求日益丰富, 由 SDH、 ATM, MSTP和波分复用 (WDM) 技术主导的数据传送网络在处理 传送层业务时变得力不从心。 为此, 下一代网絡(NGN) 中迫切需要 一种能够承载多种业务类型、提'供较好的 QoS、 适用于 MAN和广域网 (WAN) 应用, 并能够灵活扩展的低成本传送层网络。 为了满足上 述应用的要求, 现有技术中发展出基于多协议标签交换 (MPLS) 的 环网, 简称为 MPLS环网。
ITU-T Rec.Y.1711对 MPLS环网中控制信息的帧格式进行定义, 帧的类型包括连通性校验(CV) 、 前向缺陷指示 (FDI) 、 后向缺陷 指示 (BDI) 、 性能报文、 环回请求和环回响应。 其中, CV由源标签交换路由器(LSR )产生, 以 1/秒的速度发送, 在宿 LSR终结。 所述 CV报文携带有网络唯一标识符 (TTSI ) , 用于 检测网络缺陷。 FDI报文作为检测故障行为的响应, 用于压制检测到 错误的某个层以上层网络的告警, 所述故障可以是来自 C V流的缺陷 等。 BDI流是在返回通路(比如一个返回 LSP ) 上被插入的, 用来将 下行标签交换路径(LSP )的宿 LSR中检测到的缺陷通知给上行 LSR。
采用现有的 MPLS操作管理技术在环网中传送控制信息时, 会存 在以下问题:
1 ) 控制信息的每个帧都已经确定好, 功能扩展比较困难, 站点 必须根据帧格式对控制信息进行解析,故现有方法传送的控制信息灵 活性差。
2 ) 由于采用端到端的方式传送, 故控制信息在环网中需要经过 当前站点的 CPU处理后才能向下一站转发, 每个站点的处理时间为 十几毫秒或更长。 如果网絡规模大、 站点数量多, 控制信息在全网扩 散的速度会很慢, 当环网要实现自身的保护功能时, 这种逐站处理后 转发的传送方式无法保证环网在 50ms内快速实现保护。 发明内容
有鉴于此, 本发明的主要目的在于提供一种 MPLS环网中控制信 息的传送方法,使 MPLS环网中能够更为快速、 方便地传送控制信息。
为达到上述目的, 本发明的技术方案具体是这样实琬的: 一种 MPLS环网中控制信息的传送方法, 该方法包括以下步骤: a、 在源站点和宿站点之间分配标签交换路径的标签, 并建立所 述标签交换路径;
b、 通过所建立的标签交换路径在源站点和宿站点之间传递携带 对应标签的控制信息。
所述源站点和宿站点为 MPLS环网中的不同站点,步骤 a所述建立 标签交换路径的方法为:在所述标签交换路径对应的源站点和宿站点 上配置所分配的标签; 则步骤 b所述的方法为:
b 11、 源站点为待发送的控制信息报文添加所述标签交换路径的 标签, 并将该控制信息报文发出;
M2、 MPLS环网中的站点接收到控制信息报文后,根据自身保存 的标签判断所述控制信息是否以自身为宿站点,如果不是则将控制信 息直接发送到下一级站点,否则结束控制信息传递过程并将该控制信 息送自身进行处理。
所述源站点和宿站点为同一站点, 步骤 a所述建立标签交换路径 的方法为:为源站点所在 MPLS环网上的所有站点配置所分配的标签, 建立所述源站点的环形标签交换路径; 则步骤 b所述的方法为:
b21、 源站点为待发送的控制信息报文添加所述环形标签交换路 径的标签, 并将该控制信息报文发出;
b22、 MPLS环网中的各站点逐级接收到控制信息报文后, 根据自 身保存的标签判断所述控制信息是否以自身为源站点,如果不是则将 该控制信息发送到下一级站点, 同时在自身保存该控制信息, 否则结 束控制信息传递过程。
所述源站点为 MPLS环网中的任一站点,则步骤 a所述分配标签的 方法为:
为 MPLS环网中的每个站点设置对应的环形标签交换路径, 并为 每条环形标签交换路径分配不同的标签。
每个站点的环形标签交换路径包括内环和外环, 则步骤 a中为环 形标签交换路径的内环和外环分配不同的标签。 步驟 a所述分配标签的方法具体为:
为 MPLS环网中所有站点的环形标签交换路径设置公共的外层标 签, 用于标识环形标签交换路径的内环和外环, 并为每个站点设置自 身的内层标签,将外层标签和内层标签构成的嵌套标签设置为每个站 点对应的环形标签交换路径的标签。
步骤 a所述分配标签的方法为:为 MPLS环网的所有站点设置公用 的环形标签交换路径, 并分配用于标识该路径的公用标签;
则步骤 b21中, 源站点在待发送的控制信息报文上添加自身站点 标识和所述公用环形标签交换路径的标签;
步骤 b22中, MPLS环网中的各站点根据自身站点标识判断所述控 制信息是否以自身为源站点。
由上述技术方案可见, 本发明的这种 MPLS环网中控制信息的传 送方法, 针对不同源站点和宿站点之间的控制信息, 通过设置标签为 该控制信息建立对应的专用 LSP, 并在 MPLS环网上釆用所建立的专 用 LSP点到点地传送控制信息, 使控制信息的传送更为方便、 快捷。
另外, 当所建立的专用 LSP为环形 LSP时, MPLS环网上的每个站 点接收到控制信息后, 如果判定该控制信息非自身发出的, 就将控制 信息交由自身 CPU处理, 并直接向下一级站点转发所述控制信息, 从 而加快控制信息在 MPLS环网中的传送速度,更好地满足 MPLS环网对 保护功能的时间要求。 附图简要说明
图 1为本发明第一实施例中建立的 LSP示意图;
图 2为本发明第二实施例中建立的一种环形 LSP示意图; 图 3为本发明第二实施例中建立的另一种环形 LSP示意图。 实施本发明的方式
为使本发明的目的、 技术方案及优点更加清楚明白, 以下参照附 图并举实施例, 对本发明进一步详细说明。
MPLS环网中传送的控制信息分为两种, 其一是站点控制信息, 在相邻站点之间或跨站点传送, 用于对业务流量进行控制, 以实现网 络的拥塞控制和业务公平机制等功能;其二是需要在全环扩散的整环 控制信息, 主要用于完成拓朴发现和环网业务保护等功能。 整环控制 信息对时间是非常敏感的, 故必须在极短时间内完成全网扩散。
实施例一、 对于站点控制信息, 信息传送过程如下-.
al、 建立专用 LSP作为所述站点控制信息的传送管道, 为该 LSP 分配一个特有标签, 并在该控制信息的源站点和宿站点上配置所述 LSP的标签。
所建立的专用 LSP如图 1所示, 其中 LSP 1用于传送站点 A和站点 B 这两个相邻站点之间的控制信息, LSP1是双向的, 其源站点为站点 A 或站点 B中的任一个, 则另一个站点为 LSP1的宿站点; LSP2用于传送 站点 A和站点 C之间的控制信息, 在站点 A和站点 C之间存在中间站点 B。 与 LSP1相同的是, LSP2也是汉向的, 其源站点可以为站点 A或站 点 C中的任一个。
该步骤中, 站点通过标签(Label ) 区分不同的 LSP。 所述标签是 一段不包含拓朴信息、 只具有局部意义的信息内容。 为了易于处理, Label—般设置得较短, 以便通过索引直接引用。 LSP的标签值可以是 任意的, 但是应保证与 MPLS环网中传送业务的 LSP标签不重复, 或 者采用固定值作为特定 LSP的标签, 用于标识该 LSP传送的是控制信 息。
bl、 当上述两个站点之间需要传送站点控制信息时, 通过步骤 al 所建立的 LSP承载发送, 具体为:
发送端将步骤 al所建立 LSP的标签承载在控制信息报文中经由 MPLS网络传送, 接收端通过解析控制信息中的标签来接收上述站点 控制信息, 实现点到点通信。 其中, 发送端可以是上述两个站点的任 一个。
以 LSP1为例, 站点 A需要发控制信息到站点 B时, 就将 LSP1的标 签值承载在该控制信息报文上, MPLS网络将上述报文发送到站点 B , 站点 B根据 LSP1标签值确定所述控制信息是发送给自身的, 则接收该 控制信息进行处理。
对于 LSP2, 当站点 A需要发控制信息到站点 C时, MPLS网络将控 制信息经由站点 B发送, 由于站点 B上没有配置有 LSP2标签值, 故站 点 B将控制信息直接传送给站点 C , 自身不做处理, 从而加快了控制 信息的传送速度。
其它站点控制信息的传送方法与上述过程类似,通过在源站点和 宿站点之间建立的双向 LSP承载发送, 此处不再赘述。
实施例二、 对于整环控制信息, 信息传送过程如下: 建立一个环 形 LSP, 在该 LSP的数据通路中承载并传送整环控制信息, 环上的每 个站点接收到该 LSP的信息后, 直接向下一级站点转发所述整环控制 信息, 同时将数据通路中的整环控制信息交由自身 CPU进行处理。 CPU根据控制信息执行相应操作, 比如完成本地拓朴结构更新, 或实 现保护倒换等。
实际应用中, 建立环形 LSP的方法较为多样, 故整环控制信息的 传送方法有以下几种:
(一)基于图 2所示的环形 LSP, 传送方法具体为:
a2、 为源站点 A创建一组环形 LSP分别是内环 LSP1和外环 LSP2, 为这两个环形 LSP分配对应的标签值, 并给上述环形 LSP经过的每个 站点配置上 LSP 1和 LSP2的标签值。
b2、源站点 A通过上述 LSP的数据通路发出携带有 LSP1和 /或 LSP2 标签值的整环控制信息, MPLS环网上的其他站点根据自身设置的标 签值判定, 接收到的报文为上述 LSP传送的整环控制信息报文, 就将 所述整环控制信息交由自身 CPU处理, 并直接向下一站转发该整环控 制信息, 该过程由站点自身的数据转发模块完成, 转发时延能够控制 在微秒级。
c2、 整环控制信息经由 MPLS环网逐站送回到源站点 A后, 源站 点 A判定承载该整环控制信息的 LSP为自身发出的, 则终结上述整环 控制信息的传送过程。
同样地, 当 MPLS环网上的其余站点需要向全网发送整环控制信 息时, 可以采用为自身建立的环形 LSP承载发送。 为其余站点建立环 形 LSP的方法与源站点 A相同, 此处不赘述。
(二)基于图 3所示的环形 LSP, 传送方法具体为:
在方法 (一) 中, 如果 MPLS环网上的每个站点都要建立两个环 形 LSP, 所需的 LSP标签就会很多。 为减少 LSP标签的消耗, 可以为 LSP设置嵌套标签, 所述嵌套标签包括外层标签和内层标签, 利用外 层标签建立内外两个公用环形 LSP。 由于这两个公用环形 LSP的方向 不同, 故需要分配两个不同的外层标签, 分别是外层外环标签和外层 内环标签, 每个站点都可以用这两个外层标签标识自身使用的环形 LSP方向。另外,每个站点用内层标签标识自身传送的整环控制信息, 所分配的内层标签个数为 MPLS环网上的站点个数。
当每个站点收到信息报文后,根据报文上携带的内层标签值判断 是否为自身传送的整环控制信息, 如果是则结束上述信息传递过程, 否则将接收到的整环控制信息上报 CPU进行处理, 同时向下一站转发 该整环控制信息。
(三) 采用站点标识来区分 MPLS环网上不同站点的环形 LSP。 a3、 在 MPLS环网中建立内外两条环形 LSP, 这两条环形 LSP经过 MPLS环网中所有站点, 即所有站点上均配置有这两条环形 LSP的标 签值。
b3、 所有站点都使用步骤 a3建立的两条环形 LSP发送整环控制信 息, 并在所发出的整环控制信息中添加自身的站点标识。
c3、 当 MPLS环网上的某个站点接收到上述 LSP传送的整环控制 信息后, 根据站点标识进行判断, 如果是自身标识则终结该整环控制 信息的传送过程, 否则继续向下一级站点转发所述整环控制信息, 同 时向自身 CPU上报该整环控制信息, 由 CPU进行相应处理。
采用这种方式,可以有效避免标签分配过多所造成的资源占用问 题。
由上述的实施例可见, 本发明的这种 MPLS环网中控制信息的传 送方法, 针对不同源站点和宿站点之间的控制信息, 通过建立对应的 专用 LSP在 MPLS环网上传送所述控制信息, 使控制信息的传送更为 方便、 快捷。

Claims

权利要求书
1、 一种 MPLS环网中控制信息的传送方法, 其特征在于, 该方 法包括以下步骤:
a、 在源站点和宿站点之间分配标签交换路径的标签, 并建立所 述标签交换路径;
b、 通过所建立的标签交换路径在源站点和宿站点之间传递携带 对应标签的控制信息。
2、 根据权利要求 1所述的方法, 其特征在于, 所述源站点和宿站 点为 MPLS环网中的不同站点, 步骤 a所述建立标签交换路径的方法 为: 在所述标签交换路径对应的源站点和宿站点上配置所分配的标 签; 则步骤 b所述的方法为:
b 11、 源站点为待发送的控制信息报文添加所述标签交换路径的 标签, 并将该控制信息报文发出;
M2、 MPLS环网中的站点接收到控制信息报文后,根据自身保存 的标签判断所述控制信息是否以自身为宿站点,如果不是则将控制信 息直接发送到下一级站点,否则结束控制信息传递过程并将该控制信 息送自身进行处理。
3、 根据权利要求 1所述的方法, 其特征在于, 所述源站点和宿站 点为同一站点, 步驟 a所述建立标签交换路径的方法为: 为源站点所 在 MPLS环网上的所有站点配置所分配的标签, 建立所述源站点的环 形标签交换路径; 则步驟 b所述的方法为:
b21、 源站点为待发送的控制信息报文添加所述环形标签交换路 径的标签, 并将该控制信息报文发出; b22、 MPLS环网中的各站点逐级接收到控制信息报文后,根据自 身保存的标签判断所述控制信息是否以自身为源站点,如果不是则将 该控制信息发送到下一级站点, 同时在自身保存该控制信息, 否则结 束控制信息传递过程。
4、根据权利要求 3所述的方法,其特征在于,所述源站点为 MPLS 环网中的任一站点, 则步骤 a所述分配标签的方法为:
为 MPLS环网中的每个站点设置对应的环形标签交换路径, 并为 每条环形标签交换路径分配不同的标签。
5、 根据权利要求 4所述的方法, 其特征在于, 每个站点的环形标 签交换路径包括内环和外环, 则步骤 a中为环形标签交换路径的内环 和外环分配不同的标签。
6、 根据权利要求 5所述的方法, 其特征在于, 步骤 a所述分配标 签的方法具体为:
为 MPLS环网中所有站点的环形标签交换路径设置公共的外层标 签, 用于标识环形标签交换路径的内环和外环, 并为每个站点设置自 身的内层标签,将外层标签和内层标签构成的嵌套标签设置为每个站 点对应的环形标签交换路径的标签。
7、 根据权利要求 3所述的方法, 其特征在于, 步骤 a所述分配标 签的方法为:为 MPLS环网的所有站点设置公用的环形标签交换路径, 并分配用于标识该路径的公用标签;
则步骤 b21中, 源站点在待发送的控制信息报文上添加自身站点 标识和所述公用环形标签交换路径的标签;
步骤 b22中, MPLS环网中的各站点根据自身站点标识判断所述控 制信息是否以自身为源站点。
PCT/CN2005/001696 2004-10-15 2005-10-17 Procede pour la transmission de message de commande dans un reseau en boucle a commutation multiprotocole par etiquette WO2006039871A1 (fr)

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