CN101035032A - 虚拟租用线路的故障监听方法与装置 - Google Patents

虚拟租用线路的故障监听方法与装置 Download PDF

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CN101035032A
CN101035032A CNA2007100907733A CN200710090773A CN101035032A CN 101035032 A CN101035032 A CN 101035032A CN A2007100907733 A CNA2007100907733 A CN A2007100907733A CN 200710090773 A CN200710090773 A CN 200710090773A CN 101035032 A CN101035032 A CN 101035032A
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message
link
vll
link protocol
fault
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CN100466564C (zh
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刘长宝
子康
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2008/070349 priority patent/WO2008119275A1/zh
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Abstract

本发明涉及信息技术领域，公开了一种虚拟租用线路的故障监听方法与装置，其中，所述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。另外，本发明也提供了一种虚拟租用线路的故障监听装置，本发明在同种介质互连时能够监听到连接链路在任何位置发生的故障，并能根据监听到的故障对虚拟租用线路业务进行快速重路由，从而能够有效地保护虚拟租用线路业务的可靠性。

Description

虚拟租用线路的故障监听方法与装置
技术领域
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。
背景技术
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。
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：
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。
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)。
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。
发明内容
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。
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：
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。
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：
接收单元，用于从虚拟租用线路上接收报文；
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，判断所述链路协议报文是否为故障报文。
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。
附图说明
图1是现有技术的VLL组网示意图；
图2是本发明方法实施方式的流程图；
图3是本发明装置实施方式的示意图。
具体实施方式
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。
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：
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)。
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。
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。
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。
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。
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。
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。
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。
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。
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。
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。
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。
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。
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。
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。
其中，监听单元303包括：
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；
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。
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。
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。
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。
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。
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。

Claims (11)

1、一种虚拟租用线路的故障监听方法，其特征在于，所述方法包括：
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；
判断所述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。
2、如权利要求1所述的虚拟租用线路的故障监听方法，其特征在于，根据收到报文头部的报文类型标志位判断所述报文是否为链路协议报文。
3、如权利要求1所述的虚拟租用线路的故障监听方法，其特征在于，根据收到报文的数据内容判断所述链路协议报文是否为故障报文。
4、如权利要求1所述的虚拟租用线路的故障监听方法，其特征在于，在判断报文是否为故障报文之后进一步包括：
当虚拟租用线路上存在备份伪链路以及报文是故障报文时，对方供应端从主伪链路切换到备份伪链路。
5、如权利要求1所述的虚拟租用线路的故障监听方法，其特征在于，收到的报文为链路协议报文时，所述方法进一步包括：
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。
6、如权利要求1所述的虚拟租用线路的故障监听方法，其特征在于，在接收本地用户端发送给对方用户端的报文之前进一步包括：
接收链路协议的监听标识，以及利用所述监听标识触发链路协议的监听功能。
7、如权利要求1至6任一项所述的虚拟租用线路的故障监听方法，其特征在于，所述方法进一步包括：
在报文是链路协议报文时，根据收到报文的数据内容判断所述报文是否为故障恢复报文，并在报文是故障恢复报文时从备份伪链路切换到主伪链路。
8、一种虚拟租用线路的故障监听装置，其特征在于，所述装置包括：
接收单元，用于从虚拟租用线路上接收报文；
监听单元，用于判断所述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，判断所述链路协议报文是否为故障报文。
9、如权利要求8所述的虚拟租用线路的故障监听装置，其特征在于，所述监听单元包括：
第一判断单元，用于根据收到报文头部的报文类型标志位判断所述报文是否为链路协议报文，并在报文是链路协议报文时，将所述报文进行复制再发送给本地用户端的中央处理单元；
第二判断单元，用于根据收到报文的数据内容判断所述链路协议报文是否为故障报文或故障恢复报文，以及提供判断结果。
10、如权利要求8或9所述的虚拟租用线路的故障监听装置，其特征在于，所述装置还进一步包括：
切换单元，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。
11、如权利要求10所述的虚拟租用线路的故障监听装置，其特征在于，所述装置还进一步包括：
触发单元，用于接收链路协议的监听标识，以及利用所述监听标识触发链路协议的监听功能。
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