WO2017215376A1

WO2017215376A1 - Multi-segment pseudo wire detection method and network element

Info

Publication number: WO2017215376A1
Application number: PCT/CN2017/083808
Authority: WO
Inventors: 姜冰
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-06-16
Filing date: 2017-05-10
Publication date: 2017-12-21
Also published as: CN107517116B; CN107517116A

Abstract

Disclosed are a multi-segment pseudo wire detection method and a network element. The method comprises: a sending end device sending a first detection packet to a receiving end device, wherein the first detection packet comprises first identity identification information about the sending end device, and receiving a second detection packet sent by the receiving end device; and the sending end device extracting second identity identification information from the second detection packet, and determining the identity of the receiving end device according to the second identity identification information.

Description

Multi-segment pseudo line detection method and network element

Technical field

The present application relates to, but is not limited to, the field of communication technologies, and in particular, to a multi-segment pseudowire detection method and a network element.

Background technique

MS-PW (Multi-Segment Pseudo-Wire) originates from the application model of edge-to-edge pseudowire simulation, allowing multiple fragmentation between source PE (Provider Edge, Vendor Edge Device) and destination PE. PW (Pseudo-Wire) is used to connect single-segment PWs on both sides of the S-PE (Switch Provider Edge). It is not applicable to directly establish a single between the source PE and the destination PE. The scenario of segment pseudowires satisfies the requirements of network layering, cross-local network, cross-operator, and application across control planes to improve network scalability.

Bidirectional forwarding detection (BFD) is widely used on PW to detect faults on PW links. With the development of MS-PW and its application, more relevant technicians use it. The characteristics of BFD are applied to the MS-PW to detect the failure of the MS-PW link. Compared with a single-stage PW, the MS-PW has a relatively complex link, and the process of fault detection is naturally different.

Referring to FIG. 1, the device 1 and the device 2 are connected to each other through the point-of-sale vendor device, and the device 3 is connected. The device 1 and the device 3 and the device 2 and the device 3 establish a pseudowire service, and both configure a BFD detection mechanism. BFD is used in the asynchronous mode. In this mode, the two nodes of the network periodically send BFD control packets. If the BFD control packet is not received within the detection time, the corresponding BFD control packet is considered to be corresponding. The link has failed. The process of detecting the link of the MS-PW by BFD is as follows: The link established by the two nodes is a link that is dynamically triggered. Before the session is established, the devices at both ends send the remote identifier to 0. For example, the device 1 sends the packet A to the device 2, the remote identifier field of the packet A is 0, and the local identifier field is the local identifier assigned by the system to the device 1, if it is 12; The device 3 sends the packet A to the device 2, and after receiving the packet A, the device 2 checks the local identifier of the packet A, and finds that the local identifier is 12, so the identifier 12 is learned. but Yes, because the device 3 is directly connected to the device 2, and the device 1 is connected to the device 2 through the device 3, there is often a situation in which the device 2 mistakes the device 3 as being sent by the device 3 after receiving the message A. Therefore, it is erroneously considered that the identifier 12 corresponds to the device 3, thereby causing the packet to be incorrectly associated with the pseudo line segment.

In summary, when the BFD detection mechanism is used to detect the MS-PW, the source of the packet cannot be distinguished, and the pseudo-line segment is associated with the error of the packet, causing errors in the detection result and causing oscillations.

Summary of invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The multi-segment pseudowire detection method and the network element provided by the embodiment of the present invention can accurately distinguish the source of the detection message.

An embodiment of the present invention provides a multi-segment pseudowire detection method, including:

Sending a first detection packet to the receiving device, where the first detection packet includes first identity information of the sending device;

Receiving a second detection packet sent by the receiving device;

Extracting the second identity identification information in the second detection packet, and determining the identity of the receiving device according to the second identity identification information.

The embodiment of the invention further provides a network element, including a message sending module, a message receiving module and a processing module;

The packet sending module is configured to send a first detection packet to the receiving device, where the first detection packet includes first identity information of the sending device;

The packet receiving module is configured to receive a second detection packet sent by the receiving device;

The processing module is configured to: extract second identity information in the second detection packet, and determine identity of the receiving device according to the second identity information.

The embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the multi-segment pseudo line detection method of any one of the foregoing.

According to the multi-segment pseudo-line detection method, the network element, and the computer storage medium provided by the embodiment of the present invention, the transmitting end device sends the first detection packet to the receiving end device, where the first detection packet includes the first identity of the sending end device. And identifying the information, and receiving the second detection packet sent by the receiving device, the sending device extracting the second identity information from the second detection packet, and determining the identity of the receiving device according to the second identity information. The method in the embodiment of the present invention does not need to determine the identity of the sender of the message by means of learning, but uniquely determines the identity of the receiver according to the second identity information, thereby knowing that the second detection packet is received from the receiver. The end device determines the link between the receiving end device and the transmitting end device as a detecting link. To accurately distinguish the source of the detection message, the link detection of the current multi-segment pseudowire is more accurate, and the detection error is reduced.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a schematic diagram of networking;

2 is a flowchart of a method for detecting a multi-segment pseudowire according to Embodiment 1 of the present invention;

3 is a schematic structural diagram of a network element according to Embodiment 2 of the present invention;

FIG. 4 is a schematic diagram of an exemplary networking of Embodiment 2 of the present invention.

Detailed

The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

Embodiment 1:

This embodiment provides a multi-segment pseudowire detection method. Referring to FIG. 2, the method includes:

S201: The sending end device sends a first detection packet to the receiving end device, where the first detection packet includes first identifier information of the sending end device.

S202: The sending end device receives the second detection packet sent by the receiving end device, where the second The detection message includes second identification information of the receiving device;

S203: The sending end device extracts the second identity identification information in the second detection packet, and determines the identity of the receiving device.

In this implementation, when step S201 and step S202 are performed, there is no requirement of a sequence relationship between the two steps, and step S202 may be performed first or step S201 may be performed first. In the step S201, the first detection message includes first identity identification information, where the first identity identification information can uniquely identify the identity of the sender device in the network, so that the receiver device receives the first detection report. After the text, the identity of the sender device can be identified. The form of the first identification information may be various, as long as it can be uniquely identified in the network, for example, may be a number arranged according to a certain rule, or may be an identifier having a special meaning in itself. For example, it can be an IP address. The first identity identification information may be configured by the staff member on the device in advance, or the staff member may set a certain configuration rule. When the multi-segment pseudowire detection method is enabled (before step S201 is performed), the device automatically completes the pair. The assignment of its own first identity information.

The sending device may obtain the first identity information of the device, and then encapsulate the first identity information into the first detection packet. In an implementation manner, the first detection packet may be a BFD packet. The BFD packet is encapsulated with an IP header. When the IP address is used as the first identity information, the IP address can be encapsulated in the source IP address field in the IP header. In this way, additional fields can be added and the overhead can be increased. At the same time, the purpose of accurately transmitting the first identification information is achieved. The first detection packet is then sent to the peer device.

After receiving the first detection packet, the receiving end device parses the first detection packet, obtains the first identity identification information, and identifies that the first detection packet is sent according to the first identity identification information. The device, so that the link actually detected by the first detection data packet is a link between the first detection message sending device and itself.

The receiving device also sends a second detection packet to the first detection packet sending device. The first detection packet sending device performs the step S202, and the second detection packet sent by the receiving device, and the second detection packet includes the second identification information. The system of the receiving device also assigns itself to the second identity information for unique identifier identity in the network. The form may be the same as the first identification information, for example, may be a number arranged according to a certain rule. It can also be an identifier that has a special meaning in itself, for example, it can be an IP address. It can be configured by the staff in advance on the peer device, or the staff can set a certain configuration rule. When the multi-segment pseudowire detection method is enabled, the peer device automatically completes the second identity identification information of the user. distribution. The peer device obtains its own second identity information, and encapsulates the second identity information into a second detection packet. In an implementation manner, the second detection packet may be a BFD packet. The BFD packet is encapsulated with an IP header. When the IP address is used as the second identifier, the IP address can be encapsulated in the source IP address field in the IP header. Then, the second detection packet is sent to the sending device of the first detection packet.

After receiving the second detection packet, the sending end device performs step S203, and determines, according to the second identity identification information, which device is the device of the receiving end device, and determines which link is between the two devices. The link between the two is also the detection link.

In this embodiment, the transmitting device further determines whether the received second detection packet needs to be forwarded, and if it is determined that forwarding is needed, it is forwarded. The target detection information in the second detection packet is obtained, and the target path is determined according to the target object identification information, and the second detection and forwarding message is generated, and the second detection and forwarding message also carries the second identity identification information. Then, the second detection and forwarding packet is forwarded through the target path.

The above-mentioned multi-segment pseudo-line detection method can be applied to a network loaded with an MS-PW service, and the multi-segment pseudo-line detection method in this embodiment is used to assign identity identification information uniquely identifying the identity of the device to each device, and the detection is performed. When the packet is to be forwarded, the identity information is carried in the forwarding process, that is, the identification information is carried in a detection packet from the generation to the destination end. The identity information is not changed, so that when the destination receives the detection packet, the destination can easily and accurately identify which device the detection packet is generated, thereby determining which links they have experienced and the links they have passed. It is the link being detected. The judgment of the detection link is more accurate, the implementation is simple, and the use is convenient.

Embodiment 2:

This embodiment provides a network element. Referring to FIG. 3, the network element includes a message sending module 31, a message receiving module 32, and a processing module 33.

The packet sending module 31 is configured to send the first detection packet to the peer device, where the first detection packet is sent. The first identity identification information may be used to identify the identity of the network element in the network. The receiving device may identify the identity of the network element after receiving the first detection packet. The form of the first identification information may be various, as long as it can be uniquely identified in the network, for example, may be a number arranged according to a certain rule, or may be an identifier having a special meaning in itself. For example, it can be an IP address. The first identity information may be configured by the staff member on the device in advance, or the staff may set a certain configuration rule. When the multi-segment pseudowire detection method is enabled, the network element automatically completes the first identity of the user. Distribution of information.

The network element may further include an encapsulating module, and the encapsulating module obtains the first identity information of the first identity information, and then the first identity information is encapsulated into the first detection packet, and the packet sending module 31 sends the first identity information to the peer device. In an embodiment, the first detection packet may be a BFD packet. The BFD packet is encapsulated with an IP header. When the IP address is used as the first identity information, the IP address can be encapsulated in the source IP address field in the IP header.

The packet receiving module 32 is configured to receive the second detection packet sent by the receiving device, and include the second identification information in the second detection packet. The system of the receiving device also assigns itself to the second identity information for unique identifier identity in the network. The form may be the same as the first identification information, for example, may be a number arranged according to a certain rule, or may be an identifier having a special meaning in itself, for example, may be an IP address. The configuration may be configured by the staff on the receiving device in advance, or the staff may set a certain configuration rule. When the multi-segment pseudowire detection method is enabled, the receiving device automatically completes the second identity information of the user. distribution. The receiving device obtains the second identity information of the device and encapsulates the second identity information into the second detection packet. In an implementation manner, the second detection packet may be a BFD packet. The BFD packet is encapsulated with an IP header. When the IP address is used as the second identifier, the IP address can be encapsulated in the source IP address field in the IP header. The second detection packet is then sent to the network element.

The processing module 33 parses the second detection packet received by the packet receiving module 31, acquires the second identity identification information, and identifies the identity of the receiving device according to the second identity identification information, thereby determining the relationship between the two. link.

The network element further includes a judgment processing module 34 configured to determine whether it is necessary to receive the second check. The packet is forwarded, and if it is determined that forwarding is required, it is forwarded. The determination processing module 34 acquires the target object identification information in the second detection message, determines the target path according to the target object identification information, and generates a second detection and forwarding message, where the second detection and forwarding message also carries the second identity identifier. information. Then, the second detection and forwarding packet is forwarded through the target path.

In an embodiment, when the BFD is used to detect the MS-PW, the target identifier information may be a target label value carried by the BFD detection packet, where the target label value is used to point to the label value of the target device, and the sending end is used. The device itself saves the label table. The sender device can query the content of the next step corresponding to the entry of the target tag value from its own tag table. If the content of the next step needs to be forwarded, the judgment process is performed. Module 34 forwards the message. When the forwarding is performed, the second detection packet is parsed and re-encapsulated, but the content of the packet is not changed, and the second detection and forwarding packet is generated, and the second identity is still carried in the second detection and forwarding packet. Identification information.

The network element in this embodiment may be a common PE or an S-PE. When the network element is a PE, the network element does not have the function of forwarding the detection packet, and can only send the detection packet and receive the detection packet. And determining the detection link according to the identity identification information in the received detection packet, and completing the link switching when the link is found to be faulty; when the network element is the S-PE, the not only can send the detection packet and The detection packet is received, and the detection link is determined according to the identity identification information in the received detection packet, and the detection packet can be forwarded when needed.

The functions of the modules of the network element, the packet sending module 31, the message receiving module 32, the processing module 33, the encapsulating module and the judging processing module 34 in this embodiment can be implemented by the processor of the network element.

The following is a description of the network element in this embodiment. Referring to FIG. 4, FIG. 4 is a schematic diagram of a PW network composed of network elements in this embodiment. The network element 1, the network element 2, the network element 3, and the network element 4 are sequentially connected. A PW service is configured on each link. The MS-PW is configured on each device. The BFD detection mechanism is enabled on all NEs.

The IP address is used as the identity information of each device, where the IP address of the network element 1 is 1.1.1.1; the IP address of the network element 2 is 2.2.2.2; the IP address of the network element 3 is 3.3.3.3; The IP address is 4.4.4.4. The IP address of each NE is not mandatory according to the above configuration. The configuration staff will be flexible. The BFD detection link between the network element 1 and the network element 2 is the link 1; the BFD detection link between the network element 2 and the network element 3 is the link 2; and the BFD detection between the network element 3 and the network element 4 The link is link 3; the BFD detection link between network element 1 and network element 4 is link 4.

The network element 1 generates a detection packet, and the detection packet carries its own IP address 1.1.1.1; it is sent to the network element 2; the detection packet sent to the network element 2 is directly reached through the link 1. The network element 2, the network element 2 parses the detection packet, and obtains the IP address thereof as 1.1.1.1; then it is identified that the detection packet is the network element 1, and then it is determined that the transmission is completed through the link 1, thereby determining The interaction between the two is for the detection of link 1.

The network element 2 generates a detection packet, and the detection packet carries its own IP address 2.2.2.2; it is sent to the network element 3; the detection packet sent to the network element 3 is directly reached through the link 2 The network element 3, the network element 3 parses the detection packet, and obtains the IP address thereof as 2.2.2.2; then it is identified that the detection packet is the network element 2, and then it is determined that the transmission is completed through the link 2, thereby determining The interaction between the two is for the detection of link 2.

The network element 3 generates a detection packet, and the detection packet carries its own IP address 3.3.3.3; it is sent to the network element 4; the detection packet sent to the network element 4 is directly reached through the link 3. The network element 4, the network element 4 parses the detection packet, and obtains the IP address thereof as 3.3.3.3; then it is identified that the network element 3 is sent by the detection packet, and then it is determined that the transmission is completed through the link 3, thereby determining The interaction between the two is for the detection of link 3. The network element 1 generates a detection packet, and the detection packet carries its own IP address 1.1.1.1; it is sent to the network element 4; the detection packet sent to the network element 4 passes through the network through the link 4. The element 2 and the network element 3 arrive at the network element 4, and the network element 4 parses the detection packet, and obtains the IP address thereof as 1.1.1.1; then it identifies that the detection packet is the network element 4, and then determines that it is through the link. 4 The transmission is completed, thereby determining that the interaction between the two is for the detection of the link 4.

There are many other links between the network element 2, the network element 3, the network element 4, and the network element 1. These are not enumerated here. The detection process for other links is similar to the above process.

With the network element of this embodiment, when detecting the multi-segment pseudowire, the detected link can be quickly and accurately located, the detection efficiency is improved, and the erroneous connection is detected to avoid false handover.

The modules or steps of the above embodiments of the present invention can be implemented by a general-purpose computing device. They can be centralized on a single computing device or distributed over a network of multiple computing devices, which can be implemented in program code executable by the computing device so that they can be stored in a computer storage medium (ROM/RAM) , in a magnetic disk, in an optical disk, are performed by a computing device, and in some cases, the steps shown or described may be performed in an order different from that herein, or they may be separately fabricated into individual integrated circuit modules, or Multiple of these modules or steps are fabricated as a single integrated circuit module. Therefore, embodiments of the invention are not limited to any particular combination of hardware and software.

The above is a further detailed description of the embodiments of the present invention in connection with the embodiments, and the implementation of the present application is not limited to the description. It will be apparent to those skilled in the art that the present invention can be made in the form of the present invention without departing from the scope of the present invention.

Industrial applicability

The method in the embodiment of the present invention does not need to determine the identity of the sender of the message by means of learning, but uniquely determines the identity of the receiver according to the second identity information, thereby knowing that the second detection packet is received from the receiver. The end device determines that the link between the receiving end device and the transmitting end device is a detecting link, so as to accurately distinguish the source of the detecting message, and the link detection of the current multi-segment pseudowire is more accurate, and the detection error is reduced.

Claims

A multi-segment pseudowire detection method includes:

Sending a first detection packet to the receiving device, where the first detection packet includes first identity information of the sending device;

Receiving a second detection packet sent by the receiving device;

Extracting the second identity identification information in the second detection packet, and determining the identity of the receiving device according to the second identity identification information.
The multi-segment pseudo-line detection method according to claim 1, further comprising: determining, according to the second detection message, whether packet forwarding is required, and if yes, extracting target object identification information from the second detection message Determining a target path according to the target object identification information, and generating a second detection and forwarding message carrying the second identity identification information, and forwarding the second detection and forwarding message by using the target path.
The multi-segment pseudo-line detection method according to claim 2, wherein determining whether to perform packet forwarding according to the second detection message comprises: acquiring target object identification information in the second detection message, according to the The target object identification information determines whether the target object of the second detection message is itself. If yes, the packet forwarding is not required; if not, the packet forwarding is required.
The method for detecting a multi-segment line according to any one of claims 1 to 3, wherein the first detection message and the second detection message are bidirectional forwarding detection protocol messages.
The multi-segment pseudo-line detection method according to claim 4, wherein the first identity identification information and the second identity identification information are respectively encapsulated in IP addresses of the first detection packet and the second detection packet Inside the head.
The multi-segment pseudowire detection method according to any one of claims 1 to 3, wherein the first identity identification information and the second identity identification information are IP addresses of the sender device and the receiver device .
A network element includes a message sending module, a message receiving module, and a processing module;

The packet sending module is configured to send a first detection packet to the receiving device, where the first detection packet includes first identity information of the sending device;

The packet receiving module is configured to receive a second detection packet sent by the receiving device;

The processing module is configured to: extract second identity information in the second detection packet, and determine identity of the receiving device according to the second identity information.
The network element of claim 7, further comprising: a judgment processing module, determining, according to the second detection message, whether packet forwarding is required, and if yes, extracting target object identification information from the second detection packet Determining a target path according to the target object identification information, and generating a second detection and forwarding message carrying the second identity identification information, and forwarding the second detection and forwarding message by using the target path.
The network element according to claim 8, wherein the determining processing module is configured to acquire target object identification information in the second detection message, and determine a target of the second detection message according to the target object identification information Whether the object is itself, if it is, no packet forwarding is required; if not, packet forwarding is required.
The network element according to any one of claims 7-9, wherein the first detection message and the second detection message are bidirectional forwarding detection protocol messages.
A computer readable storage medium storing computer executable instructions for performing the multi-segment pseudowire detection method of any of claims 1-6.