WO2015109734A1

WO2015109734A1 - Pseudo wire protection method, device and node

Info

Publication number: WO2015109734A1
Application number: PCT/CN2014/079784
Authority: WO
Inventors: 李旭; 何忠勇
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-01-24
Filing date: 2014-06-12
Publication date: 2015-07-30
Also published as: CN104811324A

Abstract

Disclosed are a pseudo wire (PW) protection method, device and node, the method comprising: monitoring a head node receiving PW packets on a master PW path, the master PW path being a current working PW path; and directly determining whether it is necessary to perform a master/slave PW switchover operation according to the monitoring result. The present invention can detect the PW status without being based on OAM and BFD, thus reducing the detection time required for the switchover protection mechanism, and does not require additional use of system resources, thus improving resource utilization.

Description

TECHNICAL FIELD The present invention relates to a pseudowire protection method, apparatus, and node. BACKGROUND In a packet transport network (PTN) network, a Pseudo Wire (PW) protection supports PW hierarchical protection of homologous different sinks or homologous and homogeneous sinks, based on work and protection of PW. Status detection to initiate a switching action. In the current mode, the status of the PW is detected based on the Operation Administration and Maintenance (OAM) or the Bidirectional Forwarding Detection (BFD). To ensure the reliability of the detection, The definitions in the ITU-T Y.1731 standard and the BFD technical white paper need to be determined at least after 3.5 test cycles. For the system, additional resources are required to process OAM or BFD packets, and the performance of the switching is also affected. It can be seen that the existing PW protection switching mechanism requires a longer detection time and requires additional resources of the system. SUMMARY OF THE INVENTION The main technical problem to be solved by the embodiments of the present invention is to provide a pseudowire protection method, device, and node, which solves the problem that the existing pseudowire switching protection mechanism has a long detection time and needs to occupy additional resources of the system. In order to solve the above problem, the embodiment of the present invention provides a pseudowire protection method, including: monitoring a pseudowire packet receiving condition of a head node on a main pseudowire path, where the main pseudowire path is a current working pseudowire path According to the monitoring result, it is judged whether the active/standby switching operation of the pseudowire is performed. In an embodiment of the present invention, determining whether to perform the active/standby switching operation of the pseudowire according to the monitoring result includes: when the monitoring result is that the head node does not receive the pseudowire packet within the preset time threshold, Perform an active/standby switchover of the pseudowire. In an embodiment of the present invention, determining whether to perform the active/standby switching operation of the pseudowire according to the monitoring result includes: When the monitoring result is that the head node receives a pseudowire packet within a preset time threshold, and determines, according to the pseudowire packet, the tail node access side on the main pseudowire path and/or from the header When the pseudowire path of the node to the tail node is faulty, the active/standby switchover operation of the pseudowire is performed. In an embodiment of the present invention, the tail line access side on the main pseudowire path and the pseudo line from the head node to the tail node are determined according to the control word in the pseudowire message. Whether the path is faulty. In an embodiment of the present invention, determining, according to the L and R bit values in the control word, a tail node access side on the primary pseudowire path, and a direction from the head node to the tail node Whether the pseudowire path is faulty. In an embodiment of the present invention, the tail node access side on the main pseudowire path and the direction from the head node to the tail node are respectively determined according to L and R bit values of the control word. Whether the fault of the pseudowire path is: determining whether the value of the L bit of the control word is a first preset value, and if yes, determining that the tail node access side is faulty; determining the value of the R bit of the control word Whether it is a second preset value, and if so, determines a pseudowire path failure from the head node to the tail node direction. In order to solve the above problem, the present invention further provides a pseudowire protection device, including a detection module and a pseudowire protection switching module: the detection module is configured to monitor a pseudowire message reception condition of a head node on a main pseudowire path, The main pseudowire path is a current working pseudowire path. The pseudowire protection switching module is configured to determine whether to perform an active/standby switching operation of the pseudowire according to the monitoring result of the detection module. In an embodiment of the present invention, the detecting module includes a pseudowire packet detecting submodule; the pseudowire packet detecting submodule is configured to detect whether the head node receives a pseudowire within a preset time threshold. If the packet is not, the monitoring result is that the head node does not receive the pseudowire packet within the preset time threshold; the pseudowire protection switching module includes the determining submodule and the switching execution submodule, and the determining When the sub-module determines that the monitoring result is that the head node does not receive the pseudo-line message within the preset time threshold, the sub-module notifies the switching execution sub-module to perform the active/standby switching operation of the pseudo line. In an embodiment of the present invention, the detecting module includes a fault detecting submodule, and the fault detecting submodule is configured to: when the head node receives a pseudowire packet within a preset time threshold, according to the pseudo Line message judges the Whether the tail node access side on the main pseudowire path and/or the pseudowire path from the head node to the tail node direction is faulty, and a judgment result is obtained; the pseudowire protection switching module includes a judgment submodule and a switching execution a submodule, the determining submodule notifying when the judgment result is that the tail node access side on the main pseudowire path and/or the pseudowire path from the head node to the tail node is faulty The switching execution submodule performs an active/standby switching operation of the pseudowire. In an embodiment of the present invention, the fault detection sub-module includes a control word value acquisition unit and a determination unit, and the control word value acquisition unit is configured to acquire a control word in the pseudo-line message; The unit is configured to determine, according to the control word acquired by the control word value acquiring unit, whether the pseudowire path in the direction of the tail node access side on the main pseudowire path and from the head node to the tail node is faulty. In order to solve the above problem, an embodiment of the present invention further provides a node, where the node is a head node, and includes a memory and a processor, where the memory is used to store at least a program module, and the processor is configured to use according to at least one program module. The following steps are performed: monitoring the receiving of the pseudowire packet on the main pseudowire path of the node, where the main pseudowire path is the current working pseudowire path; determining whether to perform the active/standby switching operation of the pseudowire according to the monitoring result. The beneficial effects of the embodiments of the present invention are: the pseudowire protection method, device and node provided by the embodiment of the present invention directly monitor the receiving condition of the pseudowire packet on the main pseudowire path of the head node, and the main pseudowire path is the current work. The pseudowire path is directly determined based on the monitoring result to determine whether the active/standby switching operation of the pseudowire is required. It is not necessary to perform state detection of the pseudowire based on OAM or BFD. Therefore, the detection time required for the switching protection mechanism can be reduced, and the system resources are not separately occupied, which is more conducive to improving resource utilization. 1 is a schematic diagram of a format of a non-structured simulation mode control word provided in Embodiment 1 of the present invention; FIG. 2 is a schematic diagram of a format of a structured simulation mode control word provided in Embodiment 1 of the present invention; A schematic diagram of a pseudo-line protection method provided in Example 1; 4 is a schematic diagram of a pseudowire protection device provided in Embodiment 2 of the present invention; FIG. 5 is a schematic structural diagram 1 of the detection module in FIG. 4; FIG. 6 is a schematic structural diagram of a pseudowire protection switching module in FIG. FIG. 8 is a schematic diagram of a failure of a tail node access side according to Embodiment 3 of the present invention; FIG. 9 is a schematic diagram of a tail node failure according to Embodiment 3 of the present invention; FIG. 11 is a schematic diagram of a fault in the direction of the head node to the tail node of the network according to the third embodiment of the present invention; FIG. 12 is a schematic diagram of the network in the direction of the head node to the tail node of the network according to Embodiment 3 of the present invention; FIG. 13 is a schematic diagram of the fault in the direction of the tail node to the head node in the network according to the third embodiment of the present invention; FIG. 14 is a schematic diagram of the internal fault in the network according to the third embodiment of the present invention; 15 is another schematic diagram of a dual-directional internal fault in the network provided by Embodiment 3 of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be further described in detail by way of specific embodiments with reference to the accompanying drawings. Embodiment 1:

IETF RFC4553 and IETF RFC5086 respectively define a method of encapsulating unstructured and structured time division multiplexed signals into a packet switched network of pseudowires; and the definition of each bit of the control word is defined in detail in the specification. As shown in Figure 1 and Figure 2: Figure 1 shows the unstructured simulation mode control word format, and Figure 2 shows the structured simulation mode control word format. Among them, IETF RFC4553 and IETF RFC5086 stipulate that when the access side of the service path tail node fails, the current service path tail node sets the pseudowire message payload to all 1 when performing pseudowire encapsulation, and the control word is inside The L-bit position is 1 after the transmission head node; when the pseudo-line path in the direction from the head node to the tail node fails, IETF RFC4553 and IETF RFC5086 specify that the R-bit position of the control word is 1 after the current service path tail node performs the pseudo-line encapsulation. Sent to the head node. Therefore, after receiving the pseudowire packet sent by the tail node, the head node may at least know the current status of the pseudowire path in the direction from the tail node or the head node to the tail node. Therefore, in this embodiment, it is possible to directly use the tail node to send a pseudowire message to the head node to determine whether to perform the pseudowire main backup. The protection operation is replaced, and the state detection of the pseudowire is not required based on OAM or BFD, so the detection time required for the switching protection mechanism can be reduced, and the system resources are not separately occupied. Further explanation will be given below in conjunction with a specific process. As shown in FIG. 3, the method for protecting the pseudowire according to the embodiment includes: Step 301: The pseudowire packet receiving condition of the head node on the main pseudowire path is monitored. The main pseudowire path in this embodiment is the current working. The pseudo-line path, that is, the current service path; Step 302: Determine whether the active/standby switching operation of the pseudowire needs to be performed according to the monitoring result; the step includes: when the monitoring result is that the head node does not receive the pseudo-line report within the preset time threshold In this case, the active/standby switching operation of the pseudowire is performed; otherwise, whether the active/standby switching operation of the pseudowire needs to be performed is determined according to the specific state of the relevant control word in the received pseudowire message. Preferably, when the monitoring result is that the head node receives the pseudowire packet within the preset time threshold, and determines, according to the pseudowire packet, the tail node access side and/or the slave node to the tail node on the main pseudowire path. When the pseudowire path of the direction is faulty, the active/standby switchover operation of the pseudowire is performed. In this embodiment, when the head node does not receive the pseudowire packet within the preset time threshold, the fault may be a fault of the tail node on the main pseudowire path, a pseudowire path fault from the tail node to the head node, Or a pseudowire path failure from the head node to the tail node and a pseudowire path failure from the tail node to the head node. In this embodiment, when the pseudowire packet received by the head node determines that the tail node access side on the main pseudowire path and/or the pseudowire path in the direction from the head node to the tail node is faulty, according to the pseudowire report The state of the control word in the text is judged; preferably, it is possible to determine whether the pseudowire path in the direction of the tail node access side and the slave node to the tail node on the main pseudowire path is faulty by the L and R bit values in the control word. . Of course, according to the specific application scenario, the other bits in the control word or the state of the corresponding bit may be selected as the corresponding judgment basis, and details are not described herein again. In the following, only the L and R bit values in the control word are used to determine whether the pseudowire path in the direction of the tail node access side and the slave node to the tail node on the main pseudowire path is faulty: Determining the received pseudowire message Whether the value of the L bit of the control word is the first preset value, and if so, determining that the tail node access side is faulty; IETF RFC4553 and IETF RFC5086 specify that the value of the L bit at this time is 1, so in this embodiment The first preset value is 1; determining whether the value of the R bit of the control word in the received pseudowire message is the second preset value, and if so, the shell 1J determines the pseudowire path fault from the head node to the tail node direction. . IETF RFC4553 and IETF RFC5086 stipulate that the value of the R bit at this time is also 1, so the second preset value in this embodiment is also 1. It should be understood that the first preset value and the second preset value in this embodiment are not only selectable 1. According to the related protocol and the update of the specification, the value may also be changed correspondingly. And the values of the two are not limited to being the same. It can be seen that the solution provided in this embodiment does not need to additionally use OAM or BFD to perform state detection of the PW, and only needs to use the receiving condition of the pseudowire message and the control word in the pseudowire message to determine whether the pseudowire master is to be performed. Backup protection operation.

Embodiment 2: This embodiment provides a pseudowire protection device. Referring to FIG. 4, the detection module and the pseudowire protection switching module are provided. The detection module is configured to monitor the pseudowire of the head node on the main pseudowire path. In the case of the text receiving, the main pseudowire path in this embodiment is the current working pseudowire path, that is, the current service path. The pseudowire protection switching module is configured to determine whether to perform an active/standby switching operation of the pseudowire according to the monitoring result of the detection module. Preferably, as shown in FIG. 5 and FIG. 6 respectively, the detection module in this embodiment includes a pseudo-line packet detection sub-module; the pseudo-line protection switching module includes a judging sub-module and a switching execution sub-module; The sub-module is configured to detect whether the head node receives the pseudo-line message within the preset time threshold. If no, the monitoring result is that the head node does not receive the pseudo-line message within the preset time threshold. The judging sub-module of the pseudo-line protection switching module notifies the switching execution sub-module to perform the active/standby switching operation of the pseudo-line when the monitoring result is that the head node does not receive the pseudo-line message within the preset time threshold. In this embodiment, when the head node does not receive the pseudowire packet within the preset time threshold, the fault may be a fault of the tail node on the main pseudowire path, a pseudowire path fault from the tail node to the head node, Or a pseudowire path failure from the head node to the tail node and a pseudowire path failure from the tail node to the head node. Referring to FIG. 7, the detection module in this embodiment further includes a fault detection submodule. The fault detection submodule is configured to detect that the head node receives the pseudowire packet within a preset time threshold after detecting the pseudowire packet detection submodule. And determining, according to the pseudowire message, whether the tail node access side on the primary pseudowire path and/or the pseudowire path from the head node to the tail node direction is faulty, and obtaining a determination result. The judging sub-module of the pseudo-line protection switching module is further configured to notify the switching when determining that the judging result is a fault of the tail node access side and/or the slave node to the tail node in the direction of the tail node The submodule performs the active/standby switchover operation of the pseudowire. The fault detection sub-module in this embodiment includes a control word value acquisition unit and a determination unit, and the control word value acquisition unit is configured to acquire a control word in the received pseudowire message; the determination unit is configured to acquire according to the control word value acquisition unit. The control word determines whether the tail node access side on the main pseudowire path and the pseudowire path from the head node to the tail node are faulty. The preferred control word value acquisition unit may select whether the pseudowire path in the direction of the tail node access side and the slave node to the tail node on the main pseudowire path is faulty by the L and R bit values in the control word. Of course, according to the specific application scenario, the other bits in the control word or the state of the corresponding bit may be selected as the corresponding judgment basis, and details are not described herein again. The following is only to determine whether the pseudowire path in the direction of the tail node access side and the slave node to the tail node on the main pseudowire path is faulty by the L and R bit values in the control word: The judging unit judges the control word value obtaining unit Whether the value of the acquired L bit is the first preset value, and if yes, determining that the tail node access side is faulty; IETF RFC4553 and IETF RFC5086 specify that the value of the L bit at this time is 1, so the first in this embodiment A preset value may be set to 1; the determining unit determines whether the value of the R bit obtained by the control word value acquiring unit is the second preset value, and if so, determines a pseudowire path fault from the head node to the tail node direction. IETF RFC4553 and IETF RFC5086 stipulate that the value of the R bit at this time is also 1, so the second preset value in this embodiment is also 1. It should be understood that the first preset value and the second preset value in this embodiment are not only selectable 1. According to the related protocol and the update of the specification, the value may also be changed correspondingly. And the values of the two are not limited to being the same.

Embodiment 3 The embodiment of the present invention further provides a node, where the node is a head node, and is specifically a dual homing node, which includes a memory and a processor, where the memory is used to store at least one program module, and the processor is configured to use at least one The program module performs the following steps: monitoring the receiving condition of the pseudowire packet on the main pseudowire path, and the main pseudowire path is the current working pseudowire path; determining whether to perform the active/standby switching operation of the pseudowire according to the monitoring result, The steps include: performing an active/standby switching operation of the pseudowire when the monitoring result is that the head node does not receive the pseudowire packet within the preset time threshold; otherwise, according to the specific control word in the received pseudowire packet The status determines whether the active/standby switchover of the pseudowire is required. Preferably, when the monitoring result is that the head node receives the pseudowire message within the preset time threshold, And determining, according to the pseudowire packet, the active/standby switching operation of the pseudowire when determining that the tail node access side and/or the pseudowire path in the direction from the head node to the tail node are faulty on the main pseudowire path. In this embodiment, when the head node does not receive the pseudowire packet within the preset time threshold, the fault may be a fault of the tail node on the main pseudowire path, a pseudowire path fault from the tail node to the head node, Or a pseudowire path failure from the head node to the tail node and a pseudowire path failure from the tail node to the head node. In this embodiment, when the pseudowire packet received by the head node determines that the tail node access side on the main pseudowire path and/or the pseudowire path in the direction from the head node to the tail node is faulty, according to the pseudowire report The state of the control word in the text is judged; preferably, it is possible to determine whether the pseudowire path in the direction of the tail node access side and the slave node to the tail node on the main pseudowire path is faulty by the L and R bit values in the control word. . Of course, according to the specific application scenario, the other bits in the control word or the state of the corresponding bit may be selected as the corresponding judgment basis, and details are not described herein again.

Embodiment 4: The solution provided by the embodiment of the present invention is further described below in combination with several specific fault scenarios. Referring to Figure 8, the figure shows the fault of the tail node access side. The specific operation process at this time includes:

A1: The dual-homing node E1 detects the situation in which the current service path (that is, the main pseudo-line path) receives the pseudo-line message from the tail node; in Figure 8, the current service path tail node access side fails. According to RFC4553 and RFC5086, when the current service path tail node E2 performs the pseudowire packet encapsulation, the pseudowire message payload is set to all 1, and the Lbit in the control word is set to 1 and sent to the head node; In step A1, the dual-homing node E1 normally receives the pseudo-line message fed back by the tail node within a preset time threshold;

A2: The dual-homing node E1 obtains the state of the corresponding control word from the received pseudo-line message, and determines whether to perform the active/standby switching according to the obtained control word status. In this case, the dual-homed node E1 obtains the Lbit of the control word from the pseudowire message received by it. The dual-homing node E1 considers that the current primary pseudowire path is unavailable according to the value of Lbit, and triggers a pseudowire switching operation. Please refer to FIG. 9 , which shows the fault of the tail node. The specific operation process at this time includes: Bl: The dual-homed node El detects the situation in which the current service path (that is, the main pseudo-line path) receives the pseudo-line message from the tail node; in FIG. 9, the current service path tail node E2 fails, and cannot go to the dual-homing node. E1 sends a pseudo-line message, so in step B1, the dual-homing node NE1 does not receive the pseudo-line message fed back by the tail node within a preset time threshold;

B2: The dual-homing node E1 does not receive the pseudowire packet sent by the tail node E2 within the preset time. In this case, it is considered that the current main pseudowire path is unavailable, triggering the pseudowire switching operation. Referring to FIG. 10 and FIG. 11 , the figure shows a pseudo-line path fault from the head node to the tail node. The specific operation process at this time includes: C1: The dual-homing node E1 detects the path of the current service ( That is, the case where the pseudo-line message is received from the tail node on the main pseudo-line path; in FIG. 10 and FIG. 11, the internal dual-homing node E1 to the tail node E2 in the network are faulty. According to RFC4553 and RFC5086, when the current service path tail node E2 performs the pseudowire packet encapsulation, the R bit position in the pseudowire control word is set to 1, and is sent to the head node E1. Therefore, in step C1, the dual-homing node NE1 normally receives the pseudowire message fed back by the tail node within a preset time threshold;

C2: Dual-homed node E1 obtains the status of the corresponding control word from the received pseudo-line message, and judges whether to perform the active/standby switching according to the obtained control word status. In this case, the dual-homed node E1 obtains the R bit of the control word from the pseudowire message received by it. The dual-homing node E1 considers that the current primary pseudowire path is unavailable according to the value of the R bit, triggering a pseudowire switching operation. Referring to Figure 12 and Figure 13, the figure shows the fault of the pseudowire path from the tail node to the head node. The specific operation process at this time includes:

D1: The dual-homing node E1 detects the situation of the pseudowire line from the tail node on the path where the current service is located (that is, the main pseudowire path); in FIG. 12 and FIG. 13, the pseudowire from the tail node E2 to the head node E1 If the path is faulty, the pseudo-line message cannot be sent to the dual-homing node NE1. Therefore, in step D1, the dual-homing node NE1 does not receive the pseudo-line message fed back by the tail node within the preset time threshold. D2: The dual-homing node E1 does not receive the pseudowire packet sent by the tail node E2 within a preset time. In this case, it is considered that the current main pseudowire path is unavailable, and the pseudowire switching operation is triggered. Referring to FIG. 14 and FIG. 15, the figure shows the pseudowire path from the tail node to the head node and the pseudowire path fault from the head node to the tail node. The specific operation process at this time includes:

E1: The dual-homing node E1 detects the situation in which the line of the current service (that is, the main pseudo-line path) receives the pseudo-line message from the tail node; in FIG. 14 and FIG. 15, the pseudo between the tail node E2 and the head node E1 If the line path is bidirectional, the tail node E2 cannot send a pseudowire packet to the dual homing node NE1. Therefore, in step E1, the dual homing node NE1 does not receive the pseudowire packet fed back by the tail node within a preset time threshold.

E2: The dual-homing node E1 does not receive the pseudowire packet sent by the tail node E2 within the preset time. In this case, it is considered that the current main pseudowire path is unavailable, triggering the pseudowire switching operation. It can be seen that the solution provided by the embodiment of the present invention does not need to additionally use OAM or BFD to perform state detection of the pseudowire PW, and only needs to use the reception condition of the pseudowire message and the control word in the pseudowire message to determine whether to perform. Protection operation of the pseudowire active/standby switchover.

The above is a further detailed description of the present invention in conjunction with the specific embodiments. It is not intended that the specific embodiments of the invention are limited to the description. It will be apparent to those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the invention. Industrial Applicability The technical solution provided by the embodiments of the present invention can be applied to the field of pseudowires, and the detection time required for the switching protection mechanism is reduced, and the system resources are not separately occupied, which is more conducive to improving resource utilization.

Claims

Claim

A pseudowire protection method, comprising:

Monitoring, by the head node, a pseudowire packet receiving condition on the main pseudowire path, where the main pseudowire path is a current working pseudowire path;

According to the monitoring result, it is judged whether the active/standby switching operation of the pseudowire is performed.

2. The method of claim 1, wherein determining whether to perform the active/standby switching operation of the pseudowire according to the monitoring result comprises:

When the monitoring result is that the head node does not receive the pseudowire packet within the preset time threshold, the active/standby switching operation of the pseudowire is performed.

The method for protecting the pseudowire according to claim 1 or 2, wherein determining whether to perform the active/standby switching operation of the pseudowire according to the monitoring result includes:

When the monitoring result is that the head node receives a pseudowire packet within a preset time threshold, and determines, according to the pseudowire packet, the tail node access side on the main pseudowire path and/or from the header When the pseudowire path of the node to the tail node is faulty, the active/standby switchover operation of the pseudowire is performed.

The pseudowire protection method according to claim 3, wherein the tail node access side on the main pseudowire path is determined according to a control word in the pseudowire message, from the head node to the Whether the pseudowire path in the direction of the tail node is faulty.

The pseudowire protection method according to claim 4, wherein the tail node access side on the main pseudowire path is judged from the head node according to L and R bit values in the control word, respectively Whether the pseudowire path to the tail node direction is faulty.

The pseudowire protection method according to claim 5, wherein the tail node access side on the main pseudowire path is determined from the head node to the L and R bit values of the control word, respectively Whether the pseudowire path in the direction of the tail node is faulty includes:

Determining whether the value of the L bit of the control word is a first preset value, and if yes, determining that the tail node access side is faulty;

Determining whether the value of the R bit of the control word is a second preset value, and if so, determining a pseudowire path failure from the head node to the tail node direction.

A pseudowire protection device, comprising: a detection module and a pseudowire protection switching module: the detection module is configured to monitor a pseudowire packet reception condition of the head node on a main pseudowire path, where the main pseudowire path is current The pseudowire protection switching module is configured to determine whether to perform an active/standby switching operation of the pseudowire according to the monitoring result of the detection module.

The pseudowire protection device according to claim 7, wherein the detection module comprises a pseudowire packet detection submodule; the pseudowire packet detection submodule is configured to detect that the head node is at a preset time threshold Whether the pseudo-line message is received, if not, the monitoring result is that the head node does not receive the pseudo-line message within the preset time threshold; the pseudo-line protection switching module includes the determining sub-module and the switching execution The sub-module, the determining sub-module notifying the switching execution sub-module to perform an active/standby switching operation of the pseudowire when determining that the monitoring result is that the head node does not receive the pseudowire packet within the preset time threshold.

The pseudowire protection device according to claim 7 or 8, wherein the detection module comprises a fault detection submodule; the fault detection submodule is configured to receive a pseudo at the head node within a preset time threshold Determining, according to the pseudowire message, whether the tail node access side on the main pseudowire path and/or the pseudowire path from the head node to the tail node direction is faulty, and obtaining a judgment result;

The pseudowire protection switching module includes a judging submodule and a switching execution submodule, and the judging submodule determines that the judging result is a tail node access side on the main pseudowire path and/or from the head node When the pseudowire path to the tail node is faulty, the switching execution submodule is notified to perform an active/standby switching operation of the pseudowire.

The pseudowire protection device according to claim 9, wherein the fault detection submodule includes a control word value acquisition unit and a determination unit, and the control word value acquisition unit is configured to acquire the pseudowire message a control unit; the determining unit is configured to determine, according to the control word acquired by the control word value acquiring unit, a tail line access side on the main pseudowire path, and a pseudo line from the head node to the tail node direction Whether the path is faulty.

11. A node as a head node, comprising a memory and a processor, the memory for storing at least a program module, the processor for performing the following steps according to at least one of the program modules: monitoring the node at the main a pseudowire message receiving situation on the pseudowire path, where the main pseudowire path is a current working pseudowire path;