WO2015139534A1 - 基于ptn的实现链路状态穿通功能的系统、方法及装置 - Google Patents
基于ptn的实现链路状态穿通功能的系统、方法及装置 Download PDFInfo
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- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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- the present invention relates to the field of PTN (Packet Transport Network) devices, and in particular, to a system, method and device for implementing link state punch-through function based on PTN.
- PTN Packet Transport Network
- the service router (SR) and the AG (Access Gateway) are widely used in the core layer of the softswitch network.
- the AG device is located at the access layer of the softswitch network, and the PTN network is interconnected between the SR device and the AG device.
- the fault transmission between the AG device and the SR device is mainly implemented by the LPT (link-state pass through) function.
- the LPT transparently transmits the link status of the local end of the network to the peer end of the network.
- the network peer can be linked according to the status of the local end of the network.
- the LPT can detect and notify the fault of the link on the user side of the Ethernet service, and can also detect and notify the middle. Point-to-point network failure.
- the LPT When the LPT is used, if the local link is faulty, the user equipment detects the fault and automatically enables the backup link. The user tries to use the backup link to communicate with the user equipment on the peer. The LPT sends the fault information of the local link to the fault. On the peer network edge device, the peer network edge device immediately shuts down the user-side port, so that the user equipment on the peer end detects the fault and activates the backup link. This allows the network local end and the network peer to communicate on the backup link. .
- the existing LPT technology generally uses dedicated LPT messages to implement fault information transmission.
- the dedicated LPT messages need to be additionally developed with corresponding functional modules, and the time required to develop functional modules corresponding to dedicated LPT messages is longer. Not only increases the cost of use, but also increases the processing mechanism of functional modules.
- the object of the present invention is to provide a system, method and device for implementing a link state punch-through function based on PTN, which can not only simplify the processing mechanism and improve the processing efficiency of the device, but also improve the processing efficiency of the device. Can reduce network construction costs and use costs.
- a PTN-based system for implementing a link state punch-through function including a sequentially connected access gateway AG device, a first carrier edge device PE1, and a first carrier.
- PE1 When the network fault occurs on the UNI user side, PE1 sends the communication fault information to the AG device; PE1 starts the customer signal fault CSF processing module of the PW layer of the pseudowire; determines that the link state is faulty, and the CSF processing module of the PW layer of PE1 is continuous. Generate a CSF signal with the type TYPE field being 000. PE1 sends the CSF signal and the corresponding service packet to PE2 through P1 and P2. PE2 interrupts the communication on the UNI side and sends communication failure information to the SR device. The AG device and the SR device will The communication service is switched to the standby link, and the AG device and the SR device communicate through the standby link;
- PE1 sends the continuity detection message CCM of the PW layer to PE2 through P1 and P2; PE2 sends the CCM of the PW layer to PE1 through P2 and P1; respectively, whether PE1 and PE2 are received.
- CCM continuity detection message
- PE1 reports the continuity detection-connectivity loss CC-LOC information to the user.
- PE1 interrupts the communication on the UNI side and sends the communication to the AG device. The fault information is sent; the PE2 reports the CC-LOC information to the user, the PE2 interrupts the communication on the UNI side, and sends the communication fault information to the SR device; the AG device and the SR device switch the communication service to the standby link, and the AG device and the SR device pass the backup.
- PE1 receives CCM and PE2 does not receive CCM, PE2 reports CC-LOC information to the user.
- PE2 interrupts communication on the UNI side and sends communication failure information to the SR device.
- PE2 sends remote defect indication to PE1 through P2 and P1.
- RDI information PE1 interrupts the communication on the UNI side, and sends communication failure information to the AG device; the AG device and the SR device switch the communication service to the standby link, and the AG device and the SR device communicate through the standby link;
- PE1 does not receive CCM
- PE2 receives CCM
- PE1 reports CC-LOC information to the user
- PE1 interrupts communication on the UNI side, and sends communication failure information to the AG device
- PE1 sends RDI information to PE2 through P1 and P2, PE2
- the communication on the UNI side is interrupted, and the communication failure information is transmitted to the SR device; the AG device and the SR device switch the communication service to the standby link, and the AG device and the SR device communicate through the standby link.
- a PTN-based method for implementing a link state punch-through function applied to the above system includes the following steps:
- step A determine the location of the network failure, if the network failure occurs on the UNI side, go to step B, if the network failure occurs on the NNI side, go to step D;
- PE1 sends the communication fault information to the AG device; PE1 starts the CSF processing module of the PW layer; determines that the link state is faulty, and the CSF processing module of the PW layer of the PE1 continuously generates the CSF signal with the TYPE field of 000, and the PE1 sends the CSF signal. And corresponding service message, sent to PE2 through P1 and P2, go to step C;
- PE2 interrupts the communication on the UNI side, and sends communication failure information to the SR device; the AG device and the SR device switch the communication service to the standby link, and the AG device and the SR device communicate through the standby link;
- PE1 sends the continuity detection message CCM of the PW layer to the CCM through P1 and P2.
- PE1 reports CC-LOC information to the user.
- PE1 interrupts the communication on the UNI side and sends communication failure information to the AG device.
- PE2 reports CC-LOC information to the user.
- PE2 interrupts the communication on the UNI side. And sending communication failure information to the SR device; go to step E;
- PE2 If PE1 receives CCM and PE2 does not receive CCM, PE2 reports CC-LOC information to the user. PE2 interrupts the communication on the UNI side and sends communication failure information to the SR device. PE2 sends RDI information to PE1 through P2 and P1. Interrupt the communication on the UNI side, and send communication failure information to the AG device; go to step E;
- PE1 does not receive CCM, PE2 receives CCM, PE1 reports CC-LOC information to the user, PE1 interrupts communication on the UNI side, and sends communication failure information to the AG device; PE1 sends RDI information to PE2 through P1 and P2, PE2 Interrupt the communication on the UNI side, and send communication failure information to the SR device; go to step E;
- the AG device and the SR device switch the communication service to the standby link, and the AG device and the SR device communicate through the standby link.
- determining that the link state is faulty in step B includes the following process: detecting whether the link signal is lost, and if so, the link state is faulty, otherwise the link state is not faulty, and the link signal is re-detected. Lost.
- the PE2 interrupting the communication on the UNI side in the step C includes the following process: disconnecting the port on the PE2 user side.
- the PE2 interrupting the communication on the UNI side in the step C includes the following process: the user side transmitting laser of the PE2 is turned off.
- the PE1 interrupting the communication on the UNI side in the step D includes the following process: disconnecting the port connection on the user side of the PE1; in step D, the PE2 interrupting the communication on the UNI side includes the following process: disconnecting the port on the user side of the PE2. .
- the PE1 interrupting the communication on the UNI side in the step D includes the following process: the user side transmitting laser of the PE1 is turned off; and the PE2 interrupting the communication of the UNI side in the step D includes the following process: the user side transmitting laser of the PE2 is turned off.
- a device for implementing link state punch-through function based on PTN applied to the above method comprising a fault occurrence determining module, a UNI side link state judging module, a UNI side standby link communication module, an NNI side link state judging module, and an NNI Side backup link communication module;
- the fault occurrence determining module is connected to the UNI side link state judging module and the NNI side link state judging module, and the UNI side link state judging module is connected to the UNI side standby link communication module, and the NNI side link state judging module and the NNI side are respectively connected.
- the alternate link communication module is connected;
- the fault occurrence determining module is configured to: determine a location where the network fault occurs, and if the network fault occurs on the UNI side, send a fault signal to the link state judgment module of the UNI side; if the network fault occurs on the NNI side, send the module to the NNI side CSF open module. Fault signal
- the UNI side link state judging module is configured to: after receiving the fault signal sent by the fault occurrence determining module, the PE1 sends the communication fault information to the AG device; the PE1 starts the CSF processing module of the PW layer; determines that the link state is faulty, and the PE1 is faulty.
- the CSF processing module of the PW layer continuously generates a CSF signal with a TYPE field of 000, and the PE1 sends the CSF signal and the corresponding service packet to the PE2 through P1 and P2, and sends a communication signal to the UNI side backup link communication module;
- the UNI side backup link communication module is configured to: after receiving the communication signal sent by the UNI side link state determination module, the PE2 interrupts the communication on the UNI side, and sends the communication to the SR device. Fault information; the AG device and the SR device switch the communication service to the standby link, and the AG device and the SR device communicate through the standby link;
- the NNI side link state judging module is configured to: PE1 sends the PW layer continuity detection message CCM to PE2 through P1 and P2; PE2 sends the CW of the PW layer to PE1 through P2 and P1; respectively, whether PE1 and PE2 are received.
- CCM PW layer continuity detection message
- PE1 reports CC-LOC information to the user.
- PE1 interrupts the communication on the UNI side and sends communication failure information to the AG device.
- PE2 reports CC-LOC information to the user.
- PE2 interrupts the communication on the UNI side. And transmitting communication failure information to the SR device; and transmitting a communication signal to the NNI side backup link communication module;
- PE1 receives CCM and PE2 does not receive CCM, PE2 reports CC-LOC information to the user.
- PE2 interrupts the communication on the UNI side and sends communication failure information to the SR device.
- PE2 sends RDI information to PE1 through P2 and P1. Interrupting communication on the UNI side, and transmitting communication failure information to the AG device; and transmitting a communication signal to the NNI side backup link communication module;
- PE1 does not receive CCM
- PE2 receives CCM
- PE1 reports CC-LOC information to the user
- PE1 interrupts communication on the UNI side, and sends communication failure information to the AG device
- PE1 sends RDI information to PE2 through P1 and P2, PE2 Interrupting communication on the UNI side, and transmitting communication failure information to the SR device; transmitting a communication signal to the NNI side backup link communication module;
- the NNI side backup link communication module is configured to: after receiving the communication signal sent by the link state determination module of the NNI side, the AG device and the SR device switch the communication service to the standby link, and the AG device and the SR device communicate through the standby link.
- the user side and the network side can check the CSF, CCM, and RDI packet mechanisms of the original MPLS-TP OAM of the PTN device.
- the abnormality of the link state is detected, and the link state abnormality information is transmitted to the network side or the user side in time, thereby triggering the switching of the network device (the AG device and the SR device); not only the service damage can be reduced, but also the LPT function can be implemented.
- the invention does not generate additional functional modules when used, and does not generate additional overhead, which not only simplifies the processing mechanism, but also improves the processing efficiency of the device. Moreover, it can reduce network construction costs and usage costs.
- FIG. 1 is a schematic structural diagram of implementing standby link communication after a fault occurs on a PTN user side according to an embodiment of the present invention
- FIG. 2 is a schematic structural diagram of implementing standby link communication after a fault occurs on the PTN network side according to an embodiment of the present invention.
- the PTN-based system for implementing the link state punch-through function in the embodiment of the present invention includes an AG (access gateway) device and a PE1 (Provider Edge 1, respectively).
- step S1 Determine the location where the network failure occurs. If the network failure occurs on the UNI side (user side), go to step S2. If the network failure occurs on the NNI side (network side), go to step S7.
- PE1 sends communication fault information to the AG device; PE1
- the CSF (Customer Signal Failure) processing module of the PW (Pseudo Wire) layer is started, and the process proceeds to step S3.
- step S3 Detecting whether the link state is faulty. If the link signal is lost, the link state is faulty, and the process goes to step S4. If the link state is not lost, the link state is not faulty, and step S3 is performed again.
- PE2 interrupts the communication on the UNI side, sends communication failure information to the SR device, and proceeds to step S6.
- the PE2 interrupts the communication on the UNI side, including the following process: disconnecting the port on the user side of the PE2; or turning off the user side transmitting laser of the PE2.
- PE1 sends a CCM (Continuous Check Message) of the PW layer to PE2 through P1 and P2; and PE2 sends the CCM of the PW layer to PE1 through P2 and P1.
- CCM Continuous Check Message
- step S8 respectively, detecting whether PE1 and PE2 receive the CCM, if both PE1 and PE2 receive the CCM, the link fault does not occur in the intermediate point-to-point network link, and step S8 is performed again;
- PE1 receives CCM
- PE2 does not receive CCM
- PE1 cannot send CCM, go to step S10;
- PE1 reports CC-LOC (Continuous Check-Loss of Connectivity) information to the user, and PE1 interrupts communication on the UNI side and sends communication failure information to the AG device.
- CC-LOC Continuous Check-Loss of Connectivity
- the PE2 reports the CC-LOC information to the user, and the PE2 interrupts the communication on the UNI side and transmits the communication failure information to the SR device. Go to step S12.
- PE2 reports CC-LOC information to the user, and PE2 interrupts communication on the UNI side, and sends communication failure information to the SR device.
- PE2 sends RDI (Remote Defect Indication) information to PE1 through P2 and P1, and PE1 interrupts communication on the UNI side and transmits communication failure information to the AG device; Go to step S12.
- RDI Remote Defect Indication
- PE1 reports CC-LOC information to the user, and PE1 interrupts communication on the UNI side and sends communication failure information to the AG device.
- PE1 sends RDI information to PE2 through P1 and P2, and PE2 interrupts communication on the UNI side and transmits communication failure information to the SR device; Go to step S12.
- S12 The AG device and the SR device switch the communication service to the standby link, and the AG device and the SR device communicate through the standby link.
- PE1 interrupts the communication on the UNI side, including the following process: disconnecting the port on the user side of the PE1; or turning off the user side transmitting laser of the PE1.
- the PE2 interrupts the communication on the UNI side, including the following process: disconnecting the port on the user side of the PE2; or turning off the user side transmitting laser of the PE2.
- the PTN-based device for implementing the link state punch-through function in the embodiment of the present invention includes a fault occurrence determining module, a UNI side link state determining module, a UNI side standby link communication module, an NNI side link state determining module, and an NNI side. Alternate link communication module.
- the fault occurrence determining module is connected to the UNI side link state judging module and the NNI side link state judging module, and the UNI side link state judging module is connected to the UNI side standby link communication module, and the NNI side link state judging module and the NNI side are respectively connected. Alternate link communication mode Blocks are connected.
- the fault occurrence determining module is configured to: determine a location where the network fault occurs, and if the network fault occurs on the UNI side, send a fault signal to the link state judgment module of the UNI side; if the network fault occurs on the NNI side, send the module to the NNI side CSF open module. Fault signal.
- the UNI side link state judging module is configured to: after receiving the fault signal sent by the fault occurrence determining module, the PE1 sends the communication fault information to the AG device; the PE1 starts the CSF processing module of the PW layer; determines that the link state is faulty, and the PE1 is faulty.
- the CSF processing module of the PW layer continuously generates a CSF signal with a TYPE field of 000.
- the PE1 sends the CSF signal and the corresponding service packet to the PE2 through P1 and P2, and sends a communication signal to the UNI side backup link communication module.
- the UNI side backup link communication module is configured to: after receiving the communication signal sent by the UNI side link state judging module, the PE2 interrupts the communication on the UNI side, and sends the communication failure information to the SR device; the AG device and the SR device switch the communication service to The standby link, the AG device and the SR device communicate through the alternate link.
- the NNI side link state judging module is configured to: PE1 sends the PW layer continuity detection message CCM to PE2 through P1 and P2; PE2 sends the CW of the PW layer to PE1 through P2 and P1; respectively, whether PE1 and PE2 are received.
- CCM PW layer continuity detection message
- PE1 reports CC-LOC information to the user.
- PE1 interrupts the communication on the UNI side and sends communication failure information to the AG device.
- PE2 reports CC-LOC information to the user.
- PE2 interrupts the communication on the UNI side. And transmitting communication failure information to the SR device; and transmitting a communication signal to the NNI side backup link communication module.
- PE2 If PE1 receives CCM and PE2 does not receive CCM, PE2 reports CC-LOC information to the user. PE2 interrupts the communication on the UNI side and sends communication failure information to the SR device. PE2 sends RDI information to PE1 through P2 and P1. Interrupting the communication on the UNI side and transmitting communication failure information to the AG device; transmitting the communication to the NNI side backup link communication module Letter signal.
- PE1 does not receive CCM
- PE2 receives CCM
- PE1 reports CC-LOC information to the user
- PE1 interrupts communication on the UNI side, and sends communication failure information to the AG device
- PE1 sends RDI information to PE2 through P1 and P2, PE2
- the communication on the UNI side is interrupted, and communication failure information is transmitted to the SR device; the communication signal is transmitted to the NNI side backup link communication module.
- the NNI side backup link communication module is configured to: after receiving the communication signal sent by the link state determination module of the NNI side, the AG device and the SR device switch the communication service to the standby link, and the AG device and the SR device communicate through the standby link.
Abstract
本发明公开了一种基于PTN的实现链路状态穿通功能的系统、方法及装置，涉及PTN设备领域。系统包括顺次连接的接入网关AG设备、第一运营商边缘设备PE1、第一运营商设备P1、第二运营商设备P2、第二运营商边缘设备PE2和业务路由器SR设备。本发明能够通过PTN设备原有的MPLS-TP OAM的CSF、CCM和RDI报文机制，检测链路状态的异常，触发网络设备的倒换；不仅能够减小业务损伤，而且能够实现LPT功能。本发明使用时不会产生额外的功能模块，也不会产生额外的开销，不仅能够简化处理机制，提高设备的处理效率，而且能够降低网络建设成本和使用成本。
Description
本发明涉及PTN(Packet Transport Network，分组传送网)设备领域，具体涉及一种基于PTN的实现链路状态穿通功能的系统、方法及装置。
随着NGN(Next Generation Network，下一代网络)技术的趋向成熟，SR(Service Router，业务路由器)设备、AG(Access Gateway，接入网关)设备已经广泛应用于软交换网络的核心层。AG设备位于软交换网络的接入层，SR设备和AG设备之间主要采用PTN网络互联。
在PTN网络中，AG设备和SR设备之间的故障传递主要采用LPT(link-state pass through，链路状态穿通)功能实现。LPT将网络本端的链路状态透传至网络对端，网络对端能够根据网络本端的状态进行联动；LPT能够检测、并通报以太网业务用户侧链路的故障，还能够检测、并通报中间点到点网络的故障。
LPT使用时，若本端链路发生故障，用户设备会检测到故障、并自动启用备份链路，试图使用备份链路与对端的用户设备进行通信；LPT将本端链路的故障信息发送给对端网络边缘设备，对端网络边缘设备随即关闭用户侧端口，使网络对端的用户设备检测到故障发生，进而启用备份链路，以此实现网络本端和网络对端在备份链路上通信。
但是，现有的LPT技术一般采用专用的LPT报文实现故障信息的传递，专用LPT报文需要额外开发与之对应的功能模块，开发与专用LPT报文对应的功能模块所需的时间较长，不仅增加了使用成本，而且增加功能模块的处理机制比较复杂。
发明内容
针对现有技术中存在的缺陷，本发明的目的在于提供一种基于PTN的实现链路状态穿通功能的系统、方法及装置，本发明使用时不仅能够简化处理机制，提高设备的处理效率，而且能够降低网络建设成本和使用成本。
为达到以上目的，本发明采取的技术方案是：一种基于PTN的实现链路状态穿通功能的系统，包括顺次连接的接入网关AG设备、第一运营商边缘设备PE1、第一运营商设备P1、第二运营商设备P2、第二运营商边缘设备PE2和业务路由器SR设备；
当网络故障发生于UNI用户侧时，PE1将通信故障信息发送至AG设备；PE1启动伪线PW层的客户信号故障CSF处理模块；判定链路状态发生故障，PE1的PW层的CSF处理模块连续生成类型TYPE字段为000的CSF信号，PE1将CSF信号和相应的业务报文，通过P1和P2发送至PE2，PE2中断UNI侧的通信，向SR设备发送通信故障信息；AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信；
当网络故障发生于NNI网络侧时，PE1将PW层的连续性检测消息CCM通过P1和P2发送至PE2；PE2将PW层的CCM通过P2和P1发送至PE1；分别检测PE1、PE2是否收到CCM，
若PE1、PE2均未收到CCM，PE1上报连续性检测-连通性丢失CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通
信故障信息；PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信；
若PE1收到CCM、PE2未收到CCM，PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；PE2通过P2和P1，向PE1发送远端缺陷指示RDI信息，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信；
若PE1未收到CCM、PE2收到CCM，PE1上报CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；PE1通过P1和P2，向PE2发送RDI信息，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信。
一种应用于上述系统的基于PTN的实现链路状态穿通功能的方法，包括以下步骤：
A、确定网络故障发生的位置，若网络故障发生于UNI侧，转到步骤B，若网络故障发生于NNI侧，转到步骤D；
B、PE1将通信故障信息发送至AG设备；PE1启动PW层的CSF处理模块；判定链路状态发生故障，PE1的PW层的CSF处理模块连续生成TYPE字段为000的CSF信号，PE1将CSF信号和相应的业务报文，通过P1和P2发送至PE2，转到步骤C；
C、PE2中断UNI侧的通信，向SR设备发送通信故障信息；AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信；
D、PE1将PW层的连续性检测消息CCM通过P1和P2发送至
PE2；PE2将PW层的CCM通过P2和P1发送至PE1；分别检测PE1、PE2是否收到CCM，
若PE1、PE2均未收到CCM，PE1上报CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；转到步骤E；
若PE1收到CCM、PE2未收到CCM，PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；PE2通过P2和P1，向PE1发送RDI信息，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；转到步骤E；
若PE1未收到CCM、PE2收到CCM，PE1上报CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；PE1通过P1和P2，向PE2发送RDI信息，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；转到步骤E；
E、AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信。
在上述方案的基础上，步骤B中判定链路状态发生故障包括以下流程：检测链路信号是否丢失，若是，则链路状态发生故障，否则链路状态未发生故障，重新检测链路信号是否丢失。
在上述方案的基础上，步骤C中PE2中断UNI侧的通信包括以下流程：断开PE2用户侧的端口连接。
在上述方案的基础上，步骤C中PE2中断UNI侧的通信包括以下流程：关闭PE2的用户侧发送激光器。
在上述方案的基础上，步骤D中若PE1、PE2均收到CCM，继续检测PE1、PE2是否收到CCM。
在上述方案的基础上，步骤D中PE1中断UNI侧的通信包括以下流程：断开PE1用户侧的端口连接；步骤D中PE2中断UNI侧的通信包括以下流程：断开PE2用户侧的端口连接。
在上述方案的基础上，步骤D中PE1中断UNI侧的通信包括以下流程：关闭PE1的用户侧发送激光器；步骤D中PE2中断UNI侧的通信包括以下流程：关闭PE2的用户侧发送激光器。
一种应用于上述方法的基于PTN的实现链路状态穿通功能的装置，包括故障发生确定模块、UNI侧链路状态判断模块、UNI侧备用链路通信模块、NNI侧链路状态判断模块和NNI侧备用链路通信模块；
故障发生确定模块分别与UNI侧链路状态判断模块、NNI侧链路状态判断模块相连，UNI侧链路状态判断模块与UNI侧备用链路通信模块相连，NNI侧链路状态判断模块与NNI侧备用链路通信模块相连；
故障发生确定模块，用于：确定网络故障发生的位置，若网络故障发生于UNI侧，向UNI侧链路状态判断模块发送故障信号；若网络故障发生于NNI侧，向NNI侧CSF开启模块发送故障信号；
UNI侧链路状态判断模块，用于：接收故障发生确定模块发送的故障信号后，PE1将通信故障信息发送至AG设备；PE1启动PW层的CSF处理模块；判定链路状态发生故障，PE1的PW层的CSF处理模块连续生成TYPE字段为000的CSF信号，PE1将CSF信号和相应的业务报文，通过P1和P2发送至PE2，向UNI侧备用链路通信模块发送通信信号；
UNI侧备用链路通信模块，用于：接收UNI侧链路状态判断模块发送的通信信号后，PE2中断UNI侧的通信，向SR设备发送通信
故障信息；AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信；
NNI侧链路状态判断模块，用于：PE1将PW层的连续性检测消息CCM通过P1和P2发送至PE2；PE2将PW层的CCM通过P2和P1发送至PE1；分别检测PE1、PE2是否收到CCM，
若PE1、PE2均未收到CCM，PE1上报CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；向NNI侧备用链路通信模块发送通信信号；
若PE1收到CCM、PE2未收到CCM，PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；PE2通过P2和P1，向PE1发送RDI信息，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；向NNI侧备用链路通信模块发送通信信号；
若PE1未收到CCM、PE2收到CCM，PE1上报CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；PE1通过P1和P2，向PE2发送RDI信息，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；向NNI侧备用链路通信模块发送通信信号；
NNI侧备用链路通信模块，用于：接收NNI侧链路状态判断模块发送的通信信号后，AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信。
与现有技术相比，本发明的优点在于：
本发明的用户侧或网络侧发生故障时，用户侧和网络侧能够通过PTN设备原有的MPLS-TP OAM的CSF、CCM和RDI报文机制，检
测链路状态的异常、并及时将链路状态异常信息传递至网络侧或者用户侧，进而触发网络设备(AG设备和SR设备)的倒换；不仅能够减小业务损伤，而且能够实现LPT功能。与现有技术中需要额外开发功能模块的专用LPT报文相比，本发明使用时不会产生额外的功能模块，也不会产生额外的开销，不仅能够简化处理机制，提高设备的处理效率，而且能够降低网络建设成本和使用成本。
图1为本发明实施例中PTN用户侧发生故障后实现备用链路通信的结构示意图；
图2为本发明实施例中PTN网络侧发生故障后实现备用链路通信的结构示意图。
以下结合附图及实施例对本发明作进一步详细说明。
参见图1、图2所示，本发明实施例中的基于PTN的实现链路状态穿通功能的系统，包括顺次连接的AG(access gateway，接入网关)设备、PE1(Provider Edge 1，第一运营商边缘设备)、P1(第一运营商设备)、P2(第二运营商设备)、PE2(Provider Edge2，第二运营商边缘设备)和SR(service router，全业务路由器)设备。
本发明实施例中的基于PTN的实现链路状态穿通功能的方法，包括以下步骤：
S1：确定网络故障发生的位置，若网络故障发生于UNI侧(用户侧)，转到步骤S2，若网络故障发生于NNI侧(网络侧)，转到步骤S7。
S2：参见图1所示，PE1将通信故障信息发送至AG设备；PE1
启动PW(Pseudo Wire，伪线)层的CSF(Customer Signal Failure，客户信号故障)处理模块，转到步骤S3。
S3：检测链路状态是否发生故障，若链路信号丢失，则链路状态发生故障，转到步骤S4；若链路状态未丢失，则链路状态未发生故障，重新执行步骤S3。
S4：PE1的PW层的CSF处理模块连续生成TYPE(类型)字段为000的CSF信号，PE1将CSF信号和相应的业务报文，通过P1和P2发送至PE2，转到步骤S5。
S5：PE2中断UNI侧的通信，向SR设备发送通信故障信息，转到步骤S6。
PE2中断UNI侧的通信包括以下流程：断开PE2用户侧的端口连接；或者关闭PE2的用户侧发送激光器。
S6：AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信。
S7：参见图2所示，PE1将PW层的CCM(Continuous Check Message，连续性检测消息)通过P1和P2发送至PE2；PE2将PW层的CCM通过P2和P1发送至PE1。
S8：分别检测PE1、PE2是否收到CCM，若PE1、PE2均收到CCM，链路故障未发生在中间点到点的网络链路，重新执行步骤S8；
若PE1、PE2均未收到CCM，则链路故障发生在中间点到点的网络链路，转到步骤S9；
若PE1收到CCM、PE2未收到CCM，则PE1无法发送CCM，转到步骤S10；
若PE1未收到CCM、PE2收到CCM，则PE2无法发送CCM，转到步骤S11。
S9：PE1上报CC-LOC(Continuous Check-Loss of Connectivity，连续性检测-连通性丢失)信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；
PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；转到步骤S12。
S10：PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；
PE2通过P2和P1，向PE1发送RDI(远端缺陷指示)信息，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；转到步骤S12。
S11：PE1上报CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；
PE1通过P1和P2，向PE2发送RDI信息，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；转到步骤S12。
S12：AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信。
S9～S11中，PE1中断UNI侧的通信包括以下流程：断开PE1用户侧的端口连接；或者关闭PE1的用户侧发送激光器。PE2中断UNI侧的通信包括以下流程：断开PE2用户侧的端口连接；或者关闭PE2的用户侧发送激光器。
本发明实施例中的基于PTN的实现链路状态穿通功能的装置，包括故障发生确定模块、UNI侧链路状态判断模块、UNI侧备用链路通信模块、NNI侧链路状态判断模块和NNI侧备用链路通信模块。
故障发生确定模块分别与UNI侧链路状态判断模块、NNI侧链路状态判断模块相连，UNI侧链路状态判断模块与UNI侧备用链路通信模块相连，NNI侧链路状态判断模块与NNI侧备用链路通信模
块相连。
故障发生确定模块，用于：确定网络故障发生的位置，若网络故障发生于UNI侧，向UNI侧链路状态判断模块发送故障信号；若网络故障发生于NNI侧，向NNI侧CSF开启模块发送故障信号。
UNI侧链路状态判断模块，用于：接收故障发生确定模块发送的故障信号后，PE1将通信故障信息发送至AG设备；PE1启动PW层的CSF处理模块；判定链路状态发生故障，PE1的PW层的CSF处理模块连续生成TYPE字段为000的CSF信号，PE1将CSF信号和相应的业务报文，通过P1和P2发送至PE2，向UNI侧备用链路通信模块发送通信信号。
UNI侧备用链路通信模块，用于：接收UNI侧链路状态判断模块发送的通信信号后，PE2中断UNI侧的通信，向SR设备发送通信故障信息；AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信。
NNI侧链路状态判断模块，用于：PE1将PW层的连续性检测消息CCM通过P1和P2发送至PE2；PE2将PW层的CCM通过P2和P1发送至PE1；分别检测PE1、PE2是否收到CCM，
若PE1、PE2均未收到CCM，PE1上报CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；向NNI侧备用链路通信模块发送通信信号。
若PE1收到CCM、PE2未收到CCM，PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；PE2通过P2和P1，向PE1发送RDI信息，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；向NNI侧备用链路通信模块发送通
信信号。
若PE1未收到CCM、PE2收到CCM，PE1上报CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；PE1通过P1和P2，向PE2发送RDI信息，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；向NNI侧备用链路通信模块发送通信信号。
NNI侧备用链路通信模块，用于：接收NNI侧链路状态判断模块发送的通信信号后，AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信。
本发明不局限于上述实施方式，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围之内。本说明书中未作详细描述的内容属于本领域专业技术人员公知的现有技术。
Claims (9)
- 一种基于PTN的实现链路状态穿通功能的系统，其特征在于：包括顺次连接的接入网关AG设备、第一运营商边缘设备PE1、第一运营商设备P1、第二运营商设备P2、第二运营商边缘设备PE2和业务路由器SR设备；当网络故障发生于UNI用户侧时，PE1将通信故障信息发送至AG设备；PE1启动伪线PW层的客户信号故障CSF处理模块；判定链路状态发生故障，PE1的PW层的CSF处理模块连续生成类型TYPE字段为000的CSF信号，PE1将CSF信号和相应的业务报文，通过P1和P2发送至PE2，PE2中断UNI侧的通信，向SR设备发送通信故障信息；AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信；当网络故障发生于NNI网络侧时，PE1将PW层的连续性检测消息CCM通过P1和P2发送至PE2；PE2将PW层的CCM通过P2和P1发送至PE1；分别检测PE1、PE2是否收到CCM，若PE1、PE2均未收到CCM，PE1上报连续性检测-连通性丢失CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信；若PE1收到CCM、PE2未收到CCM，PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；PE2通过P2和P1，向PE1发送远端缺陷指示RDI信息，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信；若PE1未收到CCM、PE2收到CCM，PE1上报CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；PE1通过P1和P2，向PE2发送RDI信息，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信。
- 一种应用于权利要求1所述系统的基于PTN的实现链路状态穿通功能的方法，其特征在于，包括以下步骤：A、确定网络故障发生的位置，若网络故障发生于UNI侧，转到步骤B，若网络故障发生于NNI侧，转到步骤D；B、PE1将通信故障信息发送至AG设备；PE1启动PW层的CSF处理模块；判定链路状态发生故障，PE1的PW层的CSF处理模块连续生成TYPE字段为000的CSF信号，PE1将CSF信号和相应的业务报文，通过P1和P2发送至PE2，转到步骤C；C、PE2中断UNI侧的通信，向SR设备发送通信故障信息；AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信；D、PE1将PW层的连续性检测消息CCM通过P1和P2发送至PE2；PE2将PW层的CCM通过P2和P1发送至PE1；分别检测PE1、PE2是否收到CCM，若PE1、PE2均未收到CCM，PE1上报CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；转到步骤E；若PE1收到CCM、PE2未收到CCM，PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；PE2 通过P2和P1，向PE1发送RDI信息，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；转到步骤E；若PE1未收到CCM、PE2收到CCM，PE1上报CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；PE1通过P1和P2，向PE2发送RDI信息，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；转到步骤E；E、AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信。
- 如权利要求2所述的基于PTN的实现链路状态穿通功能的方法，其特征在于：步骤B中判定链路状态发生故障包括以下流程：检测链路信号是否丢失，若是，则链路状态发生故障，否则链路状态未发生故障，重新检测链路信号是否丢失。
- 如权利要求2所述的基于PTN的实现链路状态穿通功能的方法，其特征在于：步骤C中PE2中断UNI侧的通信包括以下流程：断开PE2用户侧的端口连接。
- 如权利要求2所述的基于PTN的实现链路状态穿通功能的方法，其特征在于：步骤C中PE2中断UNI侧的通信包括以下流程：关闭PE2的用户侧发送激光器。
- 如权利要求2所述的基于PTN的实现链路状态穿通功能的方法，其特征在于：步骤D中若PE1、PE2均收到CCM，继续检测PE1、PE2是否收到CCM。
- 如权利要求2所述的基于PTN的实现链路状态穿通功能的方法，其特征在于：步骤D中PE1中断UNI侧的通信包括以下流程：断开PE1用户侧的端口连接；步骤D中PE2中断UNI侧的通信包括以下流程：断开PE2用户侧的端口连接。
- 如权利要求2所述的基于PTN的实现链路状态穿通功能的方法，其特征在于：步骤D中PE1中断UNI侧的通信包括以下流程：关闭PE1的用户侧发送激光器；步骤D中PE2中断UNI侧的通信包括以下流程：关闭PE2的用户侧发送激光器。
- 一种应用于权利要求2所述方法的基于PTN的实现链路状态穿通功能的装置，其特征在于：包括故障发生确定模块、UNI侧链路状态判断模块、UNI侧备用链路通信模块、NNI侧链路状态判断模块和NNI侧备用链路通信模块；故障发生确定模块分别与UNI侧链路状态判断模块、NNI侧链路状态判断模块相连，UNI侧链路状态判断模块与UNI侧备用链路通信模块相连，NNI侧链路状态判断模块与NNI侧备用链路通信模块相连；故障发生确定模块，用于：确定网络故障发生的位置，若网络故障发生于UNI侧，向UNI侧链路状态判断模块发送故障信号；若网络故障发生于NNI侧，向NNI侧CSF开启模块发送故障信号；UNI侧链路状态判断模块，用于：接收故障发生确定模块发送的故障信号后，PE1将通信故障信息发送至AG设备；PE1启动PW层的CSF处理模块；判定链路状态发生故障，PE1的PW层的CSF处理模块连续生成TYPE字段为000的CSF信号，PE1将CSF信号和相应的业务报文，通过P1和P2发送至PE2，向UNI侧备用链路通信模块发送通信信号；UNI侧备用链路通信模块，用于：接收UNI侧链路状态判断模块发送的通信信号后，PE2中断UNI侧的通信，向SR设备发送通信故障信息；AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信；NNI侧链路状态判断模块，用于：PE1将PW层的连续性检测消息CCM通过P1和P2发送至PE2；PE2将PW层的CCM通过P2和P1发送至PE1；分别检测PE1、PE2是否收到CCM，若PE1、PE2均未收到CCM，PE1上报CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；向NNI侧备用链路通信模块发送通信信号；若PE1收到CCM、PE2未收到CCM，PE2上报CC-LOC信息至用户，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；PE2通过P2和P1，向PE1发送RDI信息，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；向NNI侧备用链路通信模块发送通信信号；若PE1未收到CCM、PE2收到CCM，PE1上报CC-LOC信息至用户，PE1中断UNI侧的通信、并向AG设备发送通信故障信息；PE1通过P1和P2，向PE2发送RDI信息，PE2中断UNI侧的通信、并向SR设备发送通信故障信息；向NNI侧备用链路通信模块发送通信信号；NNI侧备用链路通信模块，用于：接收NNI侧链路状态判断模块发送的通信信号后，AG设备和SR设备将通信业务倒换至备用链路，AG设备和SR设备通过备用链路通信。
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