CN100466564C - Fault monitoring method and device for virtual leased line - Google Patents
Fault monitoring method and device for virtual leased lineDownload PDFInfo
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- CN100466564C CN100466564CCNB2007100907733ACN200710090773ACN100466564CCN 100466564 CCN100466564 CCN 100466564CCN B2007100907733 ACNB2007100907733 ACN B2007100907733ACN 200710090773 ACN200710090773 ACN 200710090773ACN 100466564 CCN100466564 CCN 100466564C
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Abstract
Translated fromChineseDescription
Translated fromChinese技术领域technical field
本发明涉及信息技术领域，尤其涉及一种虚拟租用线路的故障监听方法与装置。The invention relates to the field of information technology, in particular to a fault monitoring method and device for a virtual leased line.
背景技术Background technique
虚拟租用线路(VLL，Virtual Leased Line)是一种网络互连业务，VLL业务是点到点的连接，如果网络中的任何一点出现故障，就会导致VLL业务中断，从而降低了VLL业务的可靠性。Virtual Leased Line (VLL, Virtual Leased Line) is a network interconnection service. VLL service is a point-to-point connection. If any point in the network fails, the VLL service will be interrupted, thereby reducing the reliability of the VLL service. sex.
为了提高VLL业务的可靠性，现有技术提出一种基于VLL的快速重路由(FRR，Fast Reroute)方法，下面结合图1对该现有技术进行描述，如图1所示，该组网图包括用户端(CE，Customer Edge)和供应端(PE，Provider Edge)，具体是这样实现的：In order to improve the reliability of the VLL service, the prior art proposes a VLL-based fast rerouting (FRR, Fast Reroute) method, which is described below in conjunction with Fig. 1, as shown in Fig. 1, the networking diagram Including the user end (CE, Customer Edge) and the supply end (PE, Provider Edge), the specific implementation is as follows:
在对方供应端和本地供应端之间建立一条主伪链路(PW，Pseudo wire)，并在对方供应端和本地备份供应端之间再建立一条备份PW，用来保护主PW。在对方供应端上主PW和备份PW共用一个连接链路(AC，Attachment circuit)，也就是对方用户端和对方供应端之间的链路；为了快速检测PW本身的故障，可以使用双向转发检测(BFD，bidirectional forwarding detection)方式，同时AC链路之间(例如，对方用户端和对方供应端、本地供应端和本地用户端、本地备份供应端和本地用户端)的故障可以根据不同的网络选用不同的检测方式，例如，以太网可以使用802.1ag或者802.1ah，异步传输模式(ATM，Asynchronous Transfer Mode)网络可以使用ATM操作和维护(ATM OAM，ATM Operation and Maintenance)信元等。Establish a primary pseudo-link (PW, Pseudo wire) between the other party's supply end and the local supply end, and establish a backup PW between the other party's supply end and the local backup supply end to protect the main PW. The main PW and the backup PW share a connection link (AC, Attachment circuit) on the other party's supply side, that is, the link between the other party's user end and the other party's supply end; in order to quickly detect the failure of the PW itself, bidirectional forwarding detection can be used (BFD, bidirectional forwarding detection) mode, at the same time, the fault between the AC link (for example, the peer user end and the peer supply end, the local supply end and the local user end, the local backup supply end and the local user end) can be based on different network Choose different detection methods, for example, Ethernet can use 802.1ag or 802.1ah, asynchronous transfer mode (ATM, Asynchronous Transfer Mode) network can use ATM operation and maintenance (ATM OAM, ATM Operation and Maintenance) cells, etc.
上述现有技术当本地供应端和本地用户端之间的AC链路出现故障后，本地供应端通过PW信令或者其他方式将故障告知对方供应端，对方供应端收到远端故障事件后就从主PW切换到备份PW上，数据也从PW切换到备份PW上；当BFD检测到主PW发生故障后，对方供应端将VLL业务切换到备份PW上。这样对方供应端、本地供应端和本地用户端之间任何一点出现故障，VLL业务都能得到有效保护。同时对不同的网络可采用不同的AC故障检测方式，对以太网使用802.1ag或者802.1ah，对ATM可以使用ATM OAM，例如远端缺陷指示(RDI，Remote Defect Indication)和报警指示信号(AIS，Alarm IndicationSignal)。In the above prior art, when the AC link between the local provider and the local user fails, the local provider notifies the counterpart supply of the fault through PW signaling or other means, and the counterpart supplier receives the remote failure event and immediately When switching from the primary PW to the backup PW, data is also switched from the PW to the backup PW; when BFD detects that the primary PW fails, the other party's provider switches the VLL service to the backup PW. In this way, the VLL service can be effectively protected if there is a failure at any point between the other party's supply end, the local supply end, and the local user end. At the same time, different AC fault detection methods can be used for different networks, 802.1ag or 802.1ah can be used for Ethernet, and ATM OAM can be used for ATM, such as remote defect indication (RDI, Remote Defect Indication) and alarm indication signal (AIS, Alarm IndicationSignal).
但是，上述现有技术在AC是点到点协议(PPP，Point-to-Point Protocol)、帧中继(FR，Frame Relay)和高级数据链路控制(HDLC，High Level Data LinkControl)链路时就分为两种情况：一种情况是异种介质互连(例如，对方用户端和对方供应端、本地供应端和本地用户端、本地备份供应端和本地用户端之间是独立协商链路状态)，此时AC可分别使用链路协议本身的机制来检测故障；另一种情况是同种介质互连，此时对方用户端和本地用户端之间需要通过PW进行链路协商，而链路协商报文在对方供应端上是透传的，因此，同种介质互连时，对方供应端不能检测到AC链路的故障，进一步，在对方供应端上无法实现从主PW切换到备份PW，也就无法实现VLL业务的保护。However, the above-mentioned prior art is when the AC is a point-to-point protocol (PPP, Point-to-Point Protocol), frame relay (FR, Frame Relay) and advanced data link control (HDLC, High Level Data LinkControl) link It is divided into two cases: one case is the interconnection of heterogeneous media (for example, the link state is independently negotiated between the other party’s user end and the other party’s supply end, the local supply end and the local user end, and the local backup supply end and the local user end. ), at this time, the AC can use the mechanism of the link protocol itself to detect faults; another case is the interconnection of the same medium. The path negotiation packets are transparently transmitted on the other party's supply end. Therefore, when the same medium is interconnected, the other party's supply end cannot detect the failure of the AC link. Furthermore, the other party's supply end cannot switch from the primary PW to the backup PW, it is impossible to realize the protection of the VLL service.
发明内容Contents of the invention
本发明实施例要解决的技术问题是提供一种虚拟租用线路的故障监听方法与装置，该方法与装置在同种介质互连的情况也能监听到AC链路的故障。The technical problem to be solved by the embodiments of the present invention is to provide a fault monitoring method and device for a virtual leased line, the method and the device can detect the fault of the AC link even when the same medium is interconnected.
为解决上述技术问题，本发明实施例提供一种虚拟租用线路的故障监听方法，该方法包括：In order to solve the above technical problems, an embodiment of the present invention provides a fault monitoring method for a virtual leased line, the method comprising:
从虚拟租用线路上接收本地用户端发送给对方用户端的报文；Receive the message sent by the local client to the other client from the virtual leased line;
判断收到的报文是否为链路协议报文，并在所述报文是链路协议报文时，将所述链路协议报文进行复制再发送给本地用户端的中央处理单元，并判断所述链路协议报文是否为故障报文。Judging whether the received message is a link protocol message, and when the message is a link protocol message, copying the link protocol message and sending it to the central processing unit of the local user end, and judging Whether the link protocol message is a fault message.
本发明实施例也提供一种虚拟租用线路的故障监听装置，该装置包括：The embodiment of the present invention also provides a fault monitoring device for a virtual leased line, the device comprising:
接收单元，用于从虚拟租用线路上接收报文；a receiving unit, configured to receive messages from the virtual leased line;
监听单元，用于判断收到的报文是否为链路协议报文，以及在所述报文是链路协议报文时，将所述链路协议报文进行复制再发送给本地用户端的中央处理单元，判断所述链路协议报文是否为故障报文。The monitoring unit is used to judge whether the received message is a link protocol message, and when the message is a link protocol message, copy the link protocol message and send it to the central A processing unit, judging whether the link protocol message is a fault message.
以上技术方案可以看出，由于本发明实施例首先判断收到的报文是否为链路协议报文，并在收到的报文为链路协议报文时，判断报文是否为故障报文，与现有技术将链路协议报文进行透传相比较，本发明实施例在VLL业务处于同种介质互连时，也能够根据链路协议报文得知AC链路在任何位置发生的故障，从而使得本发明实施例可根据监测到的故障对VLL业务进行快速重路由，进而能够有效地保护VLL业务的可靠性。As can be seen from the above technical solutions, because the embodiment of the present invention first judges whether the received message is a link protocol message, and when the received message is a link protocol message, judges whether the message is a fault message , compared with the transparent transmission of link protocol messages in the prior art, in the embodiment of the present invention, when the VLL service is interconnected on the same medium, it is also possible to know the AC link at any location according to the link protocol message failure, so that the embodiment of the present invention can perform fast rerouting on the VLL service according to the detected failure, thereby effectively protecting the reliability of the VLL service.
附图说明Description of drawings
图1是现有技术的VLL组网示意图；FIG. 1 is a schematic diagram of a VLL networking in the prior art;
图2是本发明方法实施方式的流程图；Fig. 2 is the flowchart of the embodiment of the method of the present invention;
图3是本发明装置实施方式的示意图。Figure 3 is a schematic diagram of an embodiment of the device of the present invention.
具体实施方式Detailed ways
本发明实施例提供一种虚拟租用线路的故障监听方法与装置，该方法首先从虚拟租用线路上接收本地用户端发送给对方用户端的报文；判断收到的报文是否为链路协议报文，并在所述报文是链路协议报文时，判断所述链路协议报文是否为故障报文。The embodiment of the present invention provides a fault monitoring method and device for a virtual leased line. The method first receives a message sent from a local user terminal to a counterparty user terminal from a virtual leased line; and judges whether the received message is a link protocol message , and when the message is a link protocol message, determine whether the link protocol message is a fault message.
参照图2，图2是本发明方法实施方式的流程图，下面结合图1和图2对该实施方式进行详细说明，假设图1的本地供应端是PE2a，本地用户端是CE2，本地备份供应端是PE2b，对方供应端是PE1，对方用户端是CE1，该实施方式包括以下步骤：Referring to Fig. 2, Fig. 2 is a flow chart of the embodiment of the method of the present invention. The embodiment will be described in detail below in conjunction with Fig. 1 and Fig. 2, assuming that the local supply end in Fig. 1 is PE2a, the local user end is CE2, and the local backup supply The end is PE2b, the other party's supply end is PE1, and the other party's user end is CE1. This implementation method includes the following steps:
步骤201、本地供应端接收链路协议的监听标识，利用该监听标识在本地的用户端和供应端之间的接口触发链路协议监听功能，其中，监听标识就是一个需要进行监听的标志，本地供应端只有收到该监听标识后才可以触发接口的链路协议监听功能。
步骤202、本地供应端通过本地的用户端和供应端之间的接口从虚拟租用线路上接收本地用户端发送给对方用户端的报文，例如，通过PE2a和CE2的接口接收CE2发送给CE1的报文。通常采用链路协议报文将AC链路的情况(例如AC链路正常或故障)转发给对方供应端，该链路协议报文都是协议自身定义的。
步骤203、根据收到报文头部的报文类型标志位判断该报文是否为链路协议报文，如果是，执行步骤204，否则结束流程。
步骤204、通过VLL转发链路协议报文给对方用户端，同时将该链路协议报文进行复制，然后发送给本地用户端的中央处理单元(CPU，Centralprocessing unit)。Step 204: Forward the link protocol packet to the opposite client through the VLL, and at the same time copy the link protocol packet, and then send it to the central processing unit (CPU, Central processing unit) of the local client.
步骤205、本地供应端根据收到报文的数据内容判断该链路协议报文是否为故障报文，如果是，执行步骤206，否则结束流程。
其中，报文的数据内容包括报文标识，该标识可以区分报文是故障报文还是正常报文等。Wherein, the data content of the message includes a message identifier, and the identifier can distinguish whether the message is a fault message or a normal message.
同时本地供应端根据收到的链路协议报文来驱动本地链路协议状态机，以保证状态之间能够正常进行迁移。At the same time, the local provider drives the local link protocol state machine according to the received link protocol message, so as to ensure normal transition between states.
假设本地接口的链路协议状态机包括UP状态和DOWN状态两个状态，UP状态表示可用，DOWN状态表示不可用，链路协议报文分为正常报文和故障报文两种，假设状态机的当前状态为DOWN状态，如果链路协议报文是故障报文，状态机仍为DOWN状态；如果链路协议报文是正常报文，状态机则从DOWN状态迁移至UP状态。Assume that the link protocol state machine of the local interface includes two states: UP state and DOWN state. The UP state indicates that it is available, and the DOWN state indicates that it is unavailable. Link protocol packets are divided into normal packets and fault packets. Assume that the state machine The current state of the link is the DOWN state. If the link protocol message is a fault message, the state machine is still in the DOWN state; if the link protocol message is a normal message, the state machine will transition from the DOWN state to the UP state.
如果状态机的当前状态为UP状态，如果链路协议报文是故障报文，状态机从UP状态变为DOWN状态；如果链路协议报文是正常报文，状态机仍为UP状态。If the current state of the state machine is the UP state, if the link protocol message is a fault message, the state machine changes from the UP state to the DOWN state; if the link protocol message is a normal message, the state machine is still in the UP state.
步骤206、通过VLL信令或者BFD等其他方式将报文是否为故障报文的结果通知对方供应端。Step 206 : Notify the other party of the result of whether the message is a fault message through VLL signaling or BFD or other means.
步骤207、对方供应端判断虚拟租用线路上是否存在备份PW，如果是，执行步骤208，否则结束流程。
步骤208、对方供应端从主PW切换到备份PW。
可选地，根据收到报文的数据内容判断得到该链路协议报文是故障恢复报文时，也需要通过VLL信令或者BFD等其他方式将判断结果通知对方供应端，对方供应端再从备份PW切换到主PW。Optionally, when judging that the link protocol message is a failure recovery message according to the data content of the received message, it is also necessary to notify the other side of the supply end of the judgment result through VLL signaling or BFD, and then the other side's supply end Switch from the backup PW to the primary PW.
由图1可知，主PW是PE1和PE2a之间的链路，备份PW是PE1和PE2b之间的链路，从主PW切换到备份PW就是从PE1和PE2a之间的链路切换到PE1和PE2b之间的链路。As shown in Figure 1, the primary PW is the link between PE1 and PE2a, and the backup PW is the link between PE1 and PE2b. Switching from the primary PW to the backup PW means switching from the link between PE1 and PE2a to PE1 and PE2a. Link between PE2b.
下面结合图1对本发明方法实施方式进行举例说明，假设图1的本地供应端是PE2a，本地用户端是CE2，本地备份供应端是PE2b，对方供应端是PE1，对方用户端是CE1。首先启动PE2a和CE2之间接口的链路协议监听功能，当CE2通过PE2a和CE2之间的接口向CE1发送报文时，PE2a判断该报文是链路协议报文时，通过VLL信令将该报文转发给CE2处理，同时将该报文进行复制再发送给本地的CPU，PE2a根据收到的链路协议报文来驱动本地链路协议状态机，以保证状态之间能够正常进行迁移。The embodiment of the method of the present invention is illustrated below in conjunction with FIG. 1 . Assume that the local provider in FIG. 1 is PE2a, the local client is CE2, the local backup provider is PE2b, the opposite provider is PE1, and the opposite client is CE1. First, enable the link protocol monitoring function on the interface between PE2a and CE2. When CE2 sends a packet to CE1 through the interface between PE2a and CE2, and PE2a judges that the packet is a link protocol packet, it sends the The message is forwarded to CE2 for processing, and at the same time, the message is copied and sent to the local CPU. PE2a drives the local link protocol state machine according to the received link protocol message to ensure normal transition between states. .
PE2a在监听到CE2发送给CE1的链路协议报文为故障报文时，通过VLL信令或者BFD等其他方式通知PE1从主PW切换到备份PW，例如，PE2a监听到CE2发送给CE1的报文是链路控制协议终结(Link Control protocol Terminal)报文时，通过VLL信令或者其他方式通告PE1，让PE1从主PW切换到备份PW。当PE2a监听到CE2发送给CE1的链路协议报文为故障恢复报文时，通过VLL信令或者其他方式通知PE1连接链路故障已恢复，PE1从备份PW正常回切到主PW。When PE2a detects that the link protocol packet sent by CE2 to CE1 is a failure packet, it notifies PE1 to switch from the active PW to the backup PW through VLL signaling or BFD or other means. For example, PE2a detects that the packet sent by CE2 to CE1 When the message is a link control protocol termination (Link Control protocol Terminal) message, notify PE1 through VLL signaling or other methods, so that PE1 switches from the primary PW to the backup PW. When PE2a detects that the link protocol packet sent by CE2 to CE1 is a fault restoration packet, it notifies PE1 that the link fault has been restored through VLL signaling or other methods, and PE1 normally switches back from the backup PW to the primary PW.
PE2a根据收到的链路协议报文驱动本地的链路协议状态机，例如，从UP状态到DOWN状态或者从DOWN状态到UP状态等，这样可以保证状态之间能够正常进行迁移。PE2a drives the local link protocol state machine according to the received link protocol packets, for example, from UP state to DOWN state or from DOWN state to UP state, etc., so as to ensure normal transition between states.
同样地，PE2a对CE1发送给CE2的报文也需要监听，如果该报文是链路协议报文需将报文原封不动的转发给CE2处理，如果PE2a监听到该报文是故障报文时不需要通知PE1从主PW切换到备份PW，但需要将该报文发送给对方用户端的CPU，以便驱动本地接口的链路协议状态机，保证状态之间能够正常进行迁移。Similarly, PE2a also needs to monitor the packet sent from CE1 to CE2. If the packet is a link protocol packet, it needs to forward the packet to CE2 for processing. If PE2a detects that the packet is a fault packet It is not necessary to notify PE1 to switch from the primary PW to the backup PW, but it is necessary to send the message to the CPU of the peer client to drive the link protocol state machine of the local interface and ensure normal transition between states.
本发明实施例也提供了一种虚拟租用线路的故障监听装置，由图3可知，该装置包括触发单元301、接收单元302、监听单元303以及切换单元306。The embodiment of the present invention also provides a virtual leased line fault monitoring device. As can be seen from FIG. 3 , the device includes a triggering
其中，触发单元301用于接收链路协议的监听标识，以及根据该监听标识触发链路协议监听功能。Wherein, the triggering
其中，接收单元302用于在触发链路协议监听功能之后从虚拟租用线路上接收本地用户端向对方用户端发送的报文。Wherein, the receiving
其中，监听单元303包括：Wherein, the
第一判断单元304，用于根据收到报文头部的报文类型标志位判断接收单元302该报文是否为链路协议报文，以及在报文是链路协议报文时，将该报文进行复制再发送给本地用户端的中央处理单元；The
第二判断单元305，用于在第一判断单元304得到报文是链路协议报文时，根据收到报文的数据内容判断报文是否为故障报文或故障恢复报文，并将判断结果发送给切换单元306。The
其中，切换单元306用于判断虚拟租用线路上是否存在备份伪链路，并在虚拟租用线路上存在备份伪链路和第二判断单元305得到报文是故障报文的结果时从主伪链路切换到备份伪链路，以及在第二判断单元305得到报文是故障恢复报文的结果时从备份伪链路切换到主伪链路。Wherein, switching
由上述可知，本发明实施例首先判断收到的报文是否为链路协议报文，并在收到的报文为链路协议报文时，判断报文是否为故障报文，与现有技术将链路协议报文进行透传相比较，本发明实施例在VLL业务处于同种介质互连时，也能够根据链路协议报文得知AC链路在任何位置发生的故障，从而使得本发明实施例可根据监测到的故障对VLL业务进行快速重路由，进而能够有效地保护VLL业务的可靠性。As can be seen from the above, the embodiment of the present invention first judges whether the received message is a link protocol message, and when the received message is a link protocol message, judges whether the message is a fault message, which is different from the existing Compared with the transparent transmission of the link protocol message, the embodiment of the present invention can also know the failure of the AC link at any position according to the link protocol message when the VLL service is interconnected on the same medium, so that The embodiments of the present invention can quickly re-route the VLL service according to the detected faults, thereby effectively protecting the reliability of the VLL service.
另外，本发明实施例在报文为链路协议报文时，需要将该报文发送给本地用户端的CPU，这样可以驱动本地的链路协议状态机，从而保证状态机的各个状态之间能够正常进行迁移。In addition, in the embodiment of the present invention, when the message is a link protocol message, the message needs to be sent to the CPU of the local user end, so that the local link protocol state machine can be driven, thereby ensuring that each state of the state machine can Migrate as normal.
最后，当本地用户端向对方用户端发送报文时，本发明实施例监听到报文是故障报文时从主PW切换到备份PW，报文是故障恢复报文时从备份PW切换到主PW，这样使得本发明实施例在AC链路出现故障时，都不会中断VLL业务，从而提高了VLL业务的可靠性。Finally, when the local user terminal sends a message to the opposite party user terminal, the embodiment of the present invention switches from the active PW to the backup PW when the message is detected to be a fault message, and switches from the backup PW to the active PW when the message is a fault recovery message. PW, so that the embodiment of the present invention will not interrupt the VLL service when the AC link fails, thereby improving the reliability of the VLL service.
以上对本发明实施例所提供的一种虚拟租用线路的故障监听方法与装置进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。The method and device for fault monitoring of a virtual leased line provided by the embodiment of the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiment is only for To help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification It should not be construed as a limitation of the invention.
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