WO2013016983A1 - Pseudo wire redundancy negotiation mode detection method, system and device thereof - Google Patents

Abstract

A pseudo wire (PW) redundancy negotiation mode detection method and system are provided. The method comprises: a first PW redundancy negotiation mode of a first edge device on the PW is configured and a second PW redundancy negotiation mode of a second edge device on the PW is configured meanwhile; the first edge device and the second edge device send the local PW redundancy negotiation modes to each other respectively; the first edge device and the second edge device check the received PW redundancy negotiation modes respectively and obtain check results.

Description

 Detection method, system and device for pseudowire redundancy negotiation mode

Technical field

 The present invention relates to the field of communications, and in particular, to a method and system for detecting a Pseudo Wire (PW) redundancy negotiation mode.

Background technique

 With the development of IP data networks, the IP network itself is very scalable, scalable, and compatible. However, the upgrade, extension, and interoperability of traditional communication networks (such as FR networks and ATM networks) are relatively poor. Due to the mode of transmission and the type of services, the new network sharing is also poor. Interoperability management. End-to-end PWE3 (Pseudo-Wire Emulation Edge-to-Edge) technology, which provides PW on the packet switched network by deploying PW between the carrier's edge devices (ΡΕ, Provider Edge) Layer 2 packet services such as Ethernet, Frame Relay, and Asynchronous Transfer Mode. Since PWE3 technology enables different services of operators to be transmitted in the same network, the original access method can be integrated with the existing IP backbone network, thereby reducing network duplication and saving operating costs. . At the same time, the IP backbone network can be connected to a variety of access networks to transform and enhance the original data network. Therefore, the above advantages of PWE3 technology have made it more and more widely used in various needs and networking of operators.

1 is a network structure diagram of an end-to-end pseudowire simulation according to the related art. As shown in Figure 1, a typical network reference model for end-to-end pseudowire simulation shows that the user edge device (CE1) of a user's local area network 1 accesses the carrier's MPLS through the access link (AC1). (Multi-Protocol Label Switching) The edge device (PE1) of the backbone network; the user edge device (CE2) of the user's local area network 2 accesses the edge device of the MPLS backbone network of the operator through the access link (AC2) (PE2) The operator deploys a pseudowire for this service between PE1 and PE2. A pseudowire is a collection of a pair of unidirectional Label Switch Paths (LSPs) in opposite directions. The packet in the local area network 1 of the user, which is sent from the access link AC1, is encapsulated into a protocol data unit (PDU) of the pseudowire, and is transparently transmitted to the peer PE2 device through the pseudowire. When the packet arrives at the PE2 device, PE2 is restored to the local form after being processed locally and forwarded to the local area of the user through AC2. Go to the network of network 2. The packet forwarding from CE2 to CE1 is similar to the above process.

 As users' requirements for network reliability become higher and higher, operators often need to deploy protection measures for PW services to ensure that when a PW link fails, an alternate PW link can be quickly found to replace the previous PW. The link continues to work. The traditional PW service protection is based on the PSN tunnel layer, that is, the redundancy protection technology is deployed on the PW outer tunnel (for example, LDP FRR technology or RSVP-TE FRR technology). But this is not enough for the protection of PW-based end-to-end services. For example, for the failure of the access side of the pseudowire service, the failure of the PE node, etc., the redundancy protection measures of the PSN layer will be powerless. Therefore, the industry has proposed a redundancy protection mechanism based on the pseudowire service layer.

The draft draft-ietf-pwe3-redundancy-bit-04 summarizes the scenario of deploying PW redundancy protection services and defines two PW redundancy states, Active state and Standby state. The PE device selects the PW whose current state is the active state to forward the user data. The PW in the standby state protects the PW in the active state and does not forward the user data. When the active PW cannot forward user data for some reason (such as the access side failure or the PSN side failure), the PW in the Standby state will replace the failed Active PW to forward the user packet, and the PW of the Standby state. The redundant state is switched to the active state. The redundancy status of the PW can be determined by the local configuration, and can be determined by the state of the access side or by other policies. The PW redundancy status of the PEs at both ends of the PW may be inconsistent. Therefore, the PEs at both ends of the PW need to negotiate the PW redundancy status. The result of the negotiation is the final redundancy status of the PW. The draft defines a status bit that indicates the current PW redundancy status, that is, a referential forwarding (Preferential Forwarding) to advertise and negotiate PW redundancy (including Active and Standby states). At the same time, the negotiation mode of two PW redundant status bits is defined in the draft, namely Independent Mode and Master/Slave Mode. The independent mode means that the two PE devices of the pseudowire negotiate the PW redundancy state of the pseudowire according to the local PW redundancy state and the PW redundancy state of the remote advertisement. The principle of negotiation is equivalent to the redundancy of the two ends. An "AND" operation of the remaining state, that is, when only the PW redundancy states at both ends are in the Active state, the final negotiation result is Active, and the negotiation result in all other cases is the Standby state; wherein two of the pseudowires in the master-slave mode The role of the terminal is not equal, that is, one end is the active end, and one end is the slave end. To receive and comply with the decision results of the initiative. Different negotiation modes are applicable to different PW redundancy scenarios. For details, refer to the PW redundancy scenario summarized in Appendix A of the draft. In this draft, the PW redundancy negotiation mode is configured independently on the two PE devices that establish the pseudowire, rather than negotiated. Therefore, the configuration requires the legality and validity of the configuration of the PW redundancy negotiation mode on the two PEs. In the actual service deployment, the two PEs of the PW are generally located in different areas, and because of subsequent adjustments to the network deployment, the legality and effectiveness of the PW redundancy negotiation mode configuration are very high. Hard to guarantee. For example: For the redundancy negotiation mode of a PW, both ends of the PW are configured as the active end of the master-slave mode. In this way, the two PEs of the PW will unilaterally determine the final redundancy state of the PW by using the local policy, which may result in inconsistent negotiation results of the redundancy status of the PW on the two PEs. For example, in the redundancy negotiation mode of a PW, the PE device at one end of the PW is configured in a master-slave mode (active or slave), and the PE device at the other end is configured in an independent mode, so that one end of the PW is locally redundant. The remaining state either takes the remote redundancy state as the final redundancy state of the PW, and the other end uses the negotiation result of the redundancy state of the PEs at both ends as the final redundancy state of the PW. The result of the negotiation of the redundancy status of the PW on the two PEs is also inconsistent. The inconsistency of this negotiation also affects the renegotiation and determination of the PW redundancy state when the redundancy state changes on the PE device at the subsequent end.

 The two PEs of the PW redundancy negotiation mode are difficult to guarantee because the two PEs of the PW redundancy negotiation mode are generally assigned to different areas. The problem, there is currently no effective solution.

Summary of the invention

 The main purpose of the embodiments of the present invention is to provide a method and system for detecting a PW redundancy negotiation mode, so as to solve the problem that the two PE devices of the PW are generally located in different regions, and are subsequently deployed to the network. Adjustments and other factors make the legality and validity of the PW redundancy negotiation mode configuration difficult to guarantee.

 In order to achieve the above object, according to an aspect of the present invention, a method for detecting a PW redundancy negotiation mode is provided, including:

Configure the first PW redundancy negotiation mode on the first edge device on the PW and configure the PW on the PW. a second PW redundancy negotiation mode of the second edge device;

 The first edge device and the second edge device respectively send a local PW redundancy negotiation mode to the peer end;

 The first edge device and the second edge device respectively check the received PW redundancy negotiation mode to obtain a verification result.

 Optionally, the step of the first edge device and the second edge device respectively sending the local PW redundancy negotiation mode to the peer end includes:

 Transmitting, by the first edge device, the first PW redundancy negotiation mode to the second edge device by using an end-to-end PW emulation signaling packet;

 At the same time, the second edge device sends the second PW redundancy negotiation mode to the first edge device by using an end-to-end PW emulation signaling message.

 Optionally, the step of the first edge device and the second edge device respectively verifying the received PW redundancy negotiation mode to obtain the verification result includes:

 The first edge device parses the received second PW redundancy negotiation mode to obtain second PW redundancy negotiation mode information;

 And matching the first PW redundancy negotiation mode information in the first edge device with the parsed second PW redundancy negotiation mode information to obtain a valid verification result.

 Optionally, the step of the first edge device and the second edge device respectively verifying the received PW redundancy negotiation mode to obtain the verification result includes:

 The second edge device parses the received first PW redundancy negotiation mode to obtain first PW redundancy negotiation mode information;

 And matching the second PW redundancy negotiation mode information in the second edge device with the parsed first PW redundancy negotiation mode information to obtain a valid verification result.

 Optionally, the first PW redundancy negotiation mode includes: an independent mode or a master-slave mode, where the valid check result includes:

The first PW redundancy negotiation mode and the second PW redundancy negotiation mode are both the independent modes; or The first edge device is an active end of the master-slave mode, and the second edge device is a slave end of the master-slave mode; or

 The second edge device is an active end of the master-slave mode, and the first edge device is a slave end of the master-slave mode.

 Optionally, after the first edge device and the second edge device respectively check the received PW redundancy negotiation mode to obtain the verification result, the method further includes:

 The verification result is displayed, wherein when the verification result is an invalid verification result, the system issues a prompt message.

 The embodiment of the present invention further provides a detection system for a pseudowire PW redundancy negotiation mode, which includes: a configuration unit, configured to: configure a first PW redundancy negotiation mode of a first edge device on a PW, and configure a PW on the PW a second PW redundancy negotiation mode of the second edge device;

 a sending unit, configured to: send a local PW redundancy negotiation mode of the first edge device and the second edge device to respective peer ends; and

 And a verification unit, configured to: respectively check the PW redundancy negotiation mode received by the first edge device and the second edge device to obtain a verification result.

 Optionally, the sending unit includes:

 a first sending module, configured to: send the first PW redundancy negotiation mode from the first edge device to the second edge device by using an end-to-end PW emulation signaling message;

 And a second sending module, configured to: send the second PW redundancy negotiation mode from the second edge device to the first edge device by using an end-to-end PW emulation signaling message.

 Optionally, the verification unit includes:

 a first parsing module, configured to: parse the second PW redundancy negotiation mode received by the first edge device to obtain second PW redundancy negotiation mode information;

 a first matching module, configured to: perform matching check on the first PW redundancy negotiation mode information in the first edge device with the parsed second PW redundancy negotiation mode information, to obtain valid Check the result.

Optionally, the verification unit includes: a second parsing module, configured to: parse the first PW redundancy negotiation mode received by the second edge device, to obtain first PW redundancy negotiation mode information;

 a second matching module, configured to: perform matching check on the second PW redundancy negotiation mode information in the second edge device with the parsed first PW redundancy negotiation mode information, to obtain valid Check the result.

 Optionally, the system further includes:

 And a display unit, configured to: display the verification result, wherein when the verification result is an invalid verification result, the prompt information is sent.

 The embodiment of the present invention further provides an edge device, which is located at one end of the pseudowire PW, and the edge device includes:

 a configuration module, configured to: configure a first PW redundancy negotiation mode of the edge device; the sending module is configured to: send the first PW redundancy negotiation mode to a peer edge device located at another end of the PW ;

 a receiving module, configured to: receive a second PW redundancy negotiation mode sent by the peer edge device;

 And a verification module, configured to: perform verification on the received second PW redundancy negotiation mode to obtain a verification result.

 Optionally, the sending module is configured to send the first PW redundancy negotiation mode to the peer edge device by using an end-to-end PW emulation signaling packet.

 Optionally, the verification module includes:

 a parsing submodule, configured to: parse the received second PW redundancy negotiation mode to obtain second pw redundancy negotiation mode information;

 The matching sub-module is configured to: perform matching verification on the first PW redundancy negotiation mode information of the edge device and the second PW redundancy negotiation mode information that is parsed to obtain a valid verification result.

 Optionally, the edge device further includes:

a display module, configured to: display the verification result, where the verification result is none When the result of the verification is valid, a message is sent.

 Optionally, the first PW redundancy negotiation mode includes: an independent mode or a master-slave mode, where the valid check result includes:

 The first PW redundancy negotiation mode and the second PW redundancy negotiation mode are both the independent modes; or

 The first edge device is an active end of the master-slave mode, and the second edge device is a slave end of the master-slave mode; or

 The second edge device is an active end of the master-slave mode, and the first edge device is a slave end of the master-slave mode.

 In the embodiment of the present invention, the first pseudowire PW redundancy negotiation mode of the first edge device on the pseudowire PW is configured, and the second pseudowire PW redundancy negotiation mode of the second edge device on the pseudowire PW is configured; The device and the second edge device respectively send the local pseudowire PW redundancy negotiation mode to the peer end; the first edge device and the second edge device respectively check the received pseudowire PW redundancy negotiation mode to obtain the calibration The result of the test is that the two PE devices in the prior art are generally divided into different regions, and the legality and effectiveness of the PW redundancy negotiation mode configuration are very large due to subsequent adjustments to the network deployment. It is difficult to guarantee the problem, and thus achieve the effect of effectively ensuring the legitimacy and effectiveness of the PW redundancy negotiation mode. BRIEF abstract

 The drawings are intended to provide a further understanding of the embodiments of the invention, and are intended to be a part of the invention. In the drawing:

 1 is a network structure diagram of an end-to-end pseudowire simulation according to the related art;

 2 is a structural diagram of a detection system of a PW redundancy negotiation mode according to an embodiment of the present invention; FIG. 3 is a structural diagram of an edge device according to an embodiment of the present invention;

4 is a flowchart of a method for detecting a PW redundancy negotiation mode according to an embodiment of the present invention; FIG. 5 is a detailed flowchart of a method for detecting a PW redundancy negotiation mode according to an embodiment of the present invention; 6 is a schematic diagram of coding of a PW redundancy negotiation mode TLV according to an embodiment of the present invention; and FIG. 7 is a schematic diagram of verification of a PW redundancy negotiation mode according to an embodiment of the present invention. Preferred embodiment of the invention

 Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

 The embodiment of the invention provides a method and a system for detecting a PW redundancy negotiation mode.

 2 is a structural diagram of a detection system of a PW redundancy negotiation mode according to an embodiment of the present invention. As shown in FIG. 2, the system includes: a configuration unit 10, a transmitting unit 30, and a verification unit 50.

 The configuration unit 10 is configured to configure a first PW redundancy negotiation mode of the first edge device on the PW, and configure a second PW redundancy negotiation mode of the second edge device on the PW. The sending unit 30 is configured to use the first edge. The device and the second edge device respectively send the local PW redundancy negotiation mode to the peer end; the verification unit 50 is configured to perform verification on the received PW redundancy negotiation mode by the first edge device and the second edge device, respectively. To get the verification result.

 The foregoing embodiment of the present application is configured to detect a legality detection system in a PW redundancy negotiation mode, and is configured to detect an illegal configuration of a PE device redundancy negotiation mode at both ends of a PW in a PW redundancy scenario, so as to discover PW redundancy as early as possible. The problems existing in the networking are corrected in time to achieve the effect of effectively ensuring the legitimacy and effectiveness of the PW redundancy negotiation mode.

 Specifically, the configuration unit 10 implements a pseudowire PW redundancy negotiation mode configuration on the edge device PEs of the PW, and implements the local PW by using the PEs at both ends through the PWE3 signaling. The redundancy negotiation mode is advertised to the peer PE, and then the check unit 50 is used to verify the PW redundancy negotiation mode and the local PW redundancy negotiation mode advertised by the peer PE.

 In the configuration unit 10 of the foregoing embodiment of the present application, the configuration of the PW redundancy negotiation mode may be configured on the command line interface of the PE device, or may be configured on the network management system, or may be inherited from the default attributes of the PE device. . The PW redundancy negotiation mode involved in the embodiment of the present invention may include an independent mode, an active mode in the master-slave mode, and a slave mode in the master-slave mode.

The sending unit 30 in the foregoing embodiment of the present application may include: a first sending module, configured to The edge device sends the first PW redundancy negotiation mode to the second edge device by using the end-to-end PW emulation signaling packet; the second sending module is configured to use the end-to-end PW emulation signaling packet by the second edge device. The two PW redundancy negotiation mode is sent to the first edge device.

 Specifically, the PWE3 signaling in the foregoing embodiment is specifically a PW mapping message that is advertised to the peer end when the PW is established. The local PW redundancy negotiation mode is carried in the interface parameter TLV (PW Interface Parameters TLV) of the extended PW mapping message. The coding of the specific PW redundancy negotiation mode in the signaling can be in various specific forms. This patent gives a suggested coding format. The encoding of the interface parameter TLV is as follows (Parameter ID: OxOD, Length: 4, Description: PW Redundancy Negotiation Mode), and the encoding of the redundancy negotiation mode is as follows (Independent Mode: 0x01; Master/Slave Mode (Master Role): 0x02; Master /Slave Mode(Slave Role) :0x03 ) .

 The verification unit 50 in the above embodiment of the present application may include: a first parsing module, configured to parse the received second pseudowire PW redundancy negotiation mode by the first edge device, to obtain a second pseudowire PW redundancy negotiation mode. The first matching module is configured to perform matching check on the first pseudowire PW redundancy negotiation mode information in the first edge device and the parsed second pseudowire PW redundancy negotiation mode information to obtain valid information. Check the result.

 Preferably, the verification unit 50 may further include: a second parsing module, configured to parse the received first pseudowire PW redundancy negotiation mode by the second edge device, to obtain first pseudowire PW redundancy negotiation mode information; a second matching module, configured to perform matching check between the second pseudowire PW redundancy negotiation mode information in the second edge device and the parsed first pseudowire PW redundancy negotiation mode information, to obtain a valid checksum result.

 In the embodiment of the check unit 50, the check of the PW redundancy negotiation mode and the local PW redundancy negotiation mode is to verify the validity of the PW redundancy configuration mode at both ends. Specifically, the PEs at both ends of the PW are In the PW redundancy negotiation mode, only the two ends are in independent mode, or one end is the active end of the master-slave mode, and the other end is the slave end of the master-slave mode. The configuration combination of the two PW redundancy negotiation modes is effective. The configuration combination of other PW redundancy negotiation modes should be considered incorrect.

In the above embodiment of the present application, the system may further include: a display unit 70, configured to display a verification result, where the system issues a prompt message when the verification result is an invalid verification result. Specifically, after the verification is performed, the result of the verification may be given on the command line interface or the network management. Specifically, in the embodiment of the display unit 70, the PW redundancy configuration verification result can be displayed on the command line interface based on the display command per PW, including the local PW redundancy negotiation mode and the remote notification. PW redundancy negotiation mode. It can also be displayed as a separate entry on the U2000. For the configuration of the incorrect redundancy negotiation mode, you can give corresponding alarm prompt information on the command line interface or the NMS. Prompt equipment maintenance personnel to check and modify accordingly.

FIG. 3 is a schematic structural diagram of an edge device according to an embodiment of the present invention. As shown in Figure 3, the edge device includes:

 The configuration module 301 is configured to: configure a first PW redundancy negotiation mode of the edge device; the sending module 302 is configured to: send the first PW redundancy negotiation mode to the peer end located at the other end of the PW Edge device

 The receiving module 303 is configured to: receive a second PW redundancy negotiation mode sent by the peer edge device;

 The verification module 304 is configured to: perform verification on the received second PW redundancy negotiation mode to obtain a verification result.

 Preferably, the sending module is configured to send the first PW redundancy negotiation mode to the peer edge device by using an end-to-end PW emulation signaling message.

 Preferably, the verification module may include:

 a parsing sub-module 3041, configured to: parse the received second PW redundancy negotiation mode to obtain second PW redundancy negotiation mode information;

 The matching sub-module 3042 is configured to: perform matching verification on the first PW redundancy negotiation mode information of the edge device and the parsed second PW redundancy negotiation mode information to obtain a valid check result.

 Preferably, the edge device may further include:

a display module 305, configured to: display the verification result, where the verification result is When the result of the invalid check is issued, a message is sent.

The PW redundancy negotiation mode configuration information can be carried to the peer end through PWE3 signaling in the process of the PW redundancy negotiation mode. The validity check of the configuration of the PW redundancy negotiation mode is completed before the negotiation of the remaining state. Therefore, the incorrect configuration of the PW redundancy negotiation mode on the two PEs that establish the PW can be discovered as soon as possible, prompting the device maintenance personnel to modify it in time.

 4 is a flowchart of a method for detecting a PW redundancy negotiation mode according to an embodiment of the present invention; FIG. 5 is a detailed flowchart of a method for detecting a PW redundancy negotiation mode according to an embodiment of the present invention; FIG. 6 is a flowchart according to an embodiment of the present invention. Schematic diagram of the coding of the PW redundancy negotiation mode TLV; and FIG. 7 is a schematic diagram of the verification of the PW redundancy negotiation mode according to an embodiment of the present invention.

 As shown in FIG. 4, the method for detecting the PW redundancy negotiation mode includes the following steps:

 In step S102, the first PW redundancy negotiation mode of the first edge device on the PW is configured by the configuration unit 10 shown in FIG. 2, and the second pseudowire PW redundancy negotiation mode of the second edge device on the PW is configured.

 Step S104: The first edge device and the second edge device respectively send the local PW redundancy negotiation mode to the peer end by using the sending unit 30 in FIG. 2 .

 Step S106: The first edge device and the second edge device respectively perform verification on the received PW redundancy negotiation mode by using the verification unit 50 in FIG. 2 to obtain a verification result.

 The foregoing method for detecting the validity of the PW redundancy negotiation mode is implemented in the PW redundancy scenario, and the configuration of the redundancy negotiation mode of the PEs at both ends of the PW is invalid. The problem, in order to correct in time, thus achieving the effect of effectively ensuring the legitimacy and effectiveness of the PW redundancy negotiation mode.

Specifically, the method for detecting the validity of the PW redundancy negotiation mode configuration is to perform the PW redundancy negotiation mode configuration on the PEs at both ends of the pseudowire, and implement the PEs at both ends by using the sending singleton. The local PW redundancy negotiation mode is respectively advertised to the peer PE, and then the check unit 50 is used to verify the PW redundancy negotiation mode and the local PW redundancy negotiation mode notified by the peer PE. In the above embodiment, step S104, the first edge device and the second edge device respectively respectively

The sending of the PW redundancy negotiation mode to the peer end may include: the first edge device sends the first PW redundancy negotiation mode to the second edge device by using the end-to-end pseudowire emulation signaling packet; and the second edge device passes the end to The PW emulation signaling message of the end sends the second PW redundancy negotiation mode to the first edge device.

 In the step S106 of the foregoing embodiment, the first edge device and the second edge device respectively check the received PW redundancy negotiation mode, so as to obtain the verification result, the first edge device parses the received second PW redundancy. Negotiating the mode to obtain the second PW redundancy negotiation mode information, and performing matching and verifying the first PW redundancy negotiation mode information in the first edge device with the parsed second PW redundancy negotiation mode information to obtain valid Check result.

 Preferably, in step S106, the first edge device and the second edge device respectively check the received PW redundancy negotiation mode to obtain the verification result, which may also include: the second edge device parses the received first PW redundancy. The negotiation mode is configured to obtain the first PW redundancy negotiation mode information, and the second PW redundancy negotiation mode information in the second edge device is matched and verified with the parsed first PW redundancy negotiation mode information to obtain Valid check results.

 The first PW redundancy negotiation mode in the foregoing embodiments may include: an independent mode and a master-slave mode, where the valid check result includes: the first PW redundancy negotiation mode and the second PW redundancy negotiation mode are independent Mode; or the first edge device is the active end of the master-slave mode, and the second edge device is the slave end of the master-slave mode; or the second edge device is the active end of the master-slave mode, and the first edge device is the master-slave mode The slave of the pattern.

 In the step S106 of the foregoing implementation of the present application, after the first edge device and the second edge device respectively check the received PW redundancy negotiation mode to obtain the verification result, the method further includes: displaying the verification result, where When the verification result is invalid verification result, the system issues a prompt message.

As shown in FIG. 5, in the foregoing method embodiment of the present application, the configuration of the related parameters of the pseudowire is first performed on the first edge device PE1, including the configuration of the local PW redundancy negotiation mode. The configuration of the redundancy negotiation mode can be performed on the command line interface, or on the network management system, or inherit the default configuration of the system. After the configuration of the PW parameters on the PE1 is complete, the PWE3 signaling is initiated, and the information about the PW on the PE1 is advertised to the PE2 device through the PW mapping message, where the local redundancy negotiation mode information of the PE1 is encoded in the PW mapping message. Interface Parameter Tlv The encoding format is shown in Figure 5. After receiving the mapping message advertised by PE1, ΡΕ2 parses and saves the PW redundancy negotiation mode information of PE1.

 Configure the PW parameters on PE2, including the configuration of the local PW redundancy negotiation mode. PE2 checks the validity of the PW redundancy negotiation mode advertised by the previously received PE1 with the locally configured redundancy negotiation mode. The verification strategy is shown in Figure 6. That is, the PW redundancy negotiation mode configuration of the PEs at both ends of the PW is only in the independent mode, or the active end of the master-slave mode and the slave end of the master-slave mode, and the configuration of the two PW redundancy negotiation modes. The combination is valid, and the configuration combinations of other PW redundancy negotiation modes should be considered incorrect.

 PE2 carries the PW redundancy negotiation mode information of the local configuration to PE1 through the PW mapping message sent by PE2 to PE1. After receiving the mapping message advertised by PE2, PE1 will analyze the redundancy negotiation mode information of PE2 and perform the validity check with the locally configured redundancy negotiation mode configuration information according to the verification policy of Figure 6.

 On PE1 and PE2, when the check result of the PW redundancy negotiation mode is unreasonable, the alarm information is sent through the command line interface or the NMS, and the configuration personnel are prompted to check the configuration validity and modify the operation.

 It should be noted that the steps shown in the flowchart of the accompanying drawings of the embodiments of the present invention may be executed in a computer system such as a set of computer executable instructions, and although a logical sequence is shown in the flowchart, In some cases, the steps shown or described may be performed in an order different than that described herein.

 It can be seen from the description of the foregoing embodiments that the present invention achieves the following technical effects: The present invention implements a method for detecting the legality of PW redundancy negotiation mode configuration in a PW redundancy scenario, and uses the PW redundancy negotiation proposed in this document. The method for detecting the validity of the mode configuration may be configured to carry the local PW redundancy negotiation mode configuration information to the peer end through PWE3 signaling in the process of the signaling process established by the PW, thereby completing the PW redundancy before the PW redundancy state negotiation. The negotiation mode is configured to check the validity of the negotiation mode. Therefore, the incorrect configuration of the PW redundancy negotiation mode on the two PEs that establish the PW can be discovered as soon as possible, prompting the device maintenance personnel to modify it in time.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct the associated hardware, such as a read only memory, a magnetic disk, or an optical disk. Optionally, all or part of the steps of the above embodiments may also be used. One or more integrated circuits are implemented. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

 It is to be understood that the invention may be embodied in other forms and modifications without departing from the spirit and scope of the invention. Industrial applicability

 The solution of the embodiment of the invention effectively guarantees the legitimacy and effectiveness of the PW redundancy negotiation mode.

Claims

Claim A method for detecting a pseudowire PW redundancy negotiation mode, comprising:  The first PW redundancy negotiation mode of the first edge device on the PW is configured, and the second PW redundancy negotiation mode of the second edge device on the PW is configured.  The first edge device and the second edge device respectively send a local PW redundancy negotiation mode to the peer end;  The first edge device and the second edge device respectively check the received PW redundancy negotiation mode to obtain a verification result. 2. The method according to claim 1, wherein the step of the local edge device and the second edge device respectively transmitting the local PW redundancy negotiation mode to the peer end includes:  Transmitting, by the first edge device, the first PW redundancy negotiation mode to the second edge device by using an end-to-end PW emulation signaling packet;  At the same time, the second edge device sends the second PW redundancy negotiation mode to the first edge device by using an end-to-end PW emulation signaling message. The method according to claim 2, wherein the step of the first edge device and the second edge device respectively verifying the received PW redundancy negotiation mode to obtain the verification result includes:  The first edge device parses the received second PW redundancy negotiation mode to obtain second PW redundancy negotiation mode information;  And matching the first PW redundancy negotiation mode information in the first edge device with the parsed second PW redundancy negotiation mode information to obtain a valid verification result. The method according to claim 2, wherein the step of the first edge device and the second edge device respectively verifying the received PW redundancy negotiation mode to obtain the verification result includes: The second edge device parses the received first PW redundancy negotiation mode to obtain first PW redundancy negotiation mode information; And matching the second PW redundancy negotiation mode information in the second edge device with the parsed first PW redundancy negotiation mode information to obtain a valid verification result. The method according to claim 3 or 4, wherein the first PW redundancy negotiation mode comprises: an independent mode or a master-slave mode, wherein the valid verification result comprises:  The first PW redundancy negotiation mode and the second PW redundancy negotiation mode are both the independent modes; or  The first edge device is an active end of the master-slave mode, and the second edge device is a slave end of the master-slave mode; or  The second edge device is an active end of the master-slave mode, and the first edge device is a slave end of the master-slave mode. The method according to claim 1, wherein after the first edge device and the second edge device respectively check the received PW redundancy negotiation mode to obtain a verification result, The method also includes:  The verification result is displayed, wherein when the verification result is an invalid verification result, the system issues a prompt message. 7. A detection system for a pseudowire PW redundancy negotiation mode, comprising:  a configuration unit, configured to: configure a first PW redundancy negotiation mode of the first edge device on the PW, and configure a second PW redundancy negotiation mode of the second edge device on the PW;  a sending unit, configured to: send a local PW redundancy negotiation mode of the first edge device and the second edge device to respective peer ends; and  And a verification unit, configured to: respectively check the PW redundancy negotiation mode received by the first edge device and the second edge device to obtain a verification result. 8. The system according to claim 7, wherein the sending unit comprises:  a first sending module, configured to: send the first PW redundancy negotiation mode from the first edge device to the second edge device by using an end-to-end PW emulation signaling message; a second sending module, configured to: pass the second through an end-to-end PW emulation signaling message A PW redundancy negotiation mode is sent from the second edge device to the first edge device. 9. The system according to claim 8, wherein the verification unit comprises:  a first parsing module, configured to: parse the second PW redundancy negotiation mode received by the first edge device to obtain second PW redundancy negotiation mode information;  a first matching module, configured to: perform matching check on the first PW redundancy negotiation mode information in the first edge device with the parsed second PW redundancy negotiation mode information, to obtain valid Check the result. 10. The system according to claim 8, wherein the verification unit comprises:  a second parsing module, configured to: parse the first PW redundancy negotiation mode received by the second edge device, to obtain first PW redundancy negotiation mode information;  a second matching module, configured to: perform matching check on the second PW redundancy negotiation mode information in the second edge device with the parsed first PW redundancy negotiation mode information, to obtain valid Check the result. 11. The system of claim 7, the system further comprising:  And a display unit, configured to: display the verification result, wherein when the verification result is an invalid verification result, the prompt information is sent.  An edge device, located at one end of the pseudowire PW, the edge device includes: a configuration module, configured to: configure a first PW redundancy negotiation mode of the edge device; and a sending module, configured to: The first PW redundancy negotiation mode is sent to the peer edge device located at the other end of the PW;  a receiving module, configured to: receive a second PW redundancy negotiation mode sent by the peer edge device;  And a verification module, configured to: perform verification on the received second PW redundancy negotiation mode to obtain a verification result. 13. The edge device according to claim 12, wherein The sending module is configured to pass the first PW by using an end-to-end PW emulation signaling message The redundancy negotiation mode is sent to the peer edge device. The edge device according to claim 13, wherein the verification module comprises: a parsing submodule, configured to: parse the received second PW redundancy negotiation mode to obtain a second pw redundancy Negotiation mode information;  The matching sub-module is configured to: perform matching verification on the first PW redundancy negotiation mode information of the edge device and the second PW redundancy negotiation mode information that is parsed to obtain a valid verification result. 15. The edge device of claim 12, further comprising:  And a display module, configured to: display the verification result, wherein when the verification result is an invalid verification result, a prompt message is sent. The edge device according to claim 15, wherein: the first PW redundancy negotiation mode comprises: an independent mode or a master-slave mode, wherein the valid verification result comprises:  The first PW redundancy negotiation mode and the second PW redundancy negotiation mode are both the independent modes; or  The first edge device is an active end of the master-slave mode, and the second edge device is a slave end of the master-slave mode; or  The second edge device is an active end of the master-slave mode, and the first edge device is a slave end of the master-slave mode.