WO2012079405A2

WO2012079405A2 - Link trace processing method and system

Info

Publication number: WO2012079405A2
Application number: PCT/CN2011/080315
Authority: WO
Inventors: 黄登成
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-12-16
Filing date: 2011-09-28
Publication date: 2012-06-21
Also published as: CN102571464A; WO2012079405A3; CN102571464B

Abstract

Disclosed are a link trace processing method and system. The method comprises the following steps: a receiving port receiving a continuity check message (CCM), the CCM carrying a link path record field for indicating ports through which the CCM passes; the receiving port updating the content of the link path record field, and sending to a next port the CCM carrying the updated link path record field. Through the present invention, the system may use the CCM to trace the state of the link, thereby improving the processing capacity of the system.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a link tracking processing method and system. BACKGROUND OF THE INVENTION Institute for Electrical and Electronic Engineers (abbreviated as

IEEE) The 802.1ag standard provides logical point-to-point connectivity detection for Connectivity Fault Management (CFM), ie, Connectivity Check (CC), Link Tracking, and Faults. Point confirmation and isolation. The CC provides logical point-to-point connectivity detection, and the connectivity check is implemented by periodically sending a Connectivity Check Message (CCM). CCM is a protocol frame that provides connectivity detection management. Each Maintenance Sets End Point Identifier (MEP) periodically sends multicast CCM packets to all MEPs in the list according to the remote MEP table, and tells the other party that the peer MEP is in the maintenance set (maintenance associations). , referred to as connectivity within MA). In the related art, Link Trace (LT) is the main means for checking the fault point of the network, including two types of packets: Link Trace Message (LTM) and link tracking. Response (Link Trace Response, referred to as LTR). The LT is used to detect the path between the MEPs. It is similar to the Route Trace command in the operating system. The SP calculates the LTR message by sending a multicast LTM message to the specified device and listening to the device along the path. Path information to the specified MEP device. For example, the implementation of the LT function may be: Each maintenance point (MP) of the LTM message will respond to the received LTM message, generate an LTR message, and send it back to the source MP; The MP parses the received message response and obtains a link path. 1 is a schematic diagram of a CCM message format definition according to the related art, and FIG. 2 is a schematic diagram of a LTM message format definition according to the related art, as shown in FIG. 1 and FIG. 2, wherein TIN represents a message format definition method. , divided into 3 parts, type (Type), length (Length), value (Value). The specific definition can be found in the IEEE802.1ag standard, which is not described here. It can be seen that the CC provides logical point-to-point connectivity detection, and periodically sends detection messages periodically, but this method can only detect the link with fault, but cannot determine the location; and LT is to detect between MEPs. The path can detect the point of failure of the network. However, the method is passively detected, that is, it needs to be manually initiated by the user. In view of the above-mentioned related art, the use of CC detection cannot determine the location of the fault and the use of the LT requires manual initiation, and no effective solution has been proposed at present. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a link tracking processing scheme to solve the problem in the above related art that the fault location cannot be determined using continuity detection. In order to achieve the above object, according to an aspect of the present invention, a link tracking processing method is provided. The tracking processing method of the link according to the present invention includes the following steps: the receiving port receives the CCM, wherein the CCM carries a link path record field for indicating a CCM way port; the receiving port updates the link path record field, and The updated link path record field is carried to the CCM and sent to the next port. Preferably, before the updated link path record field is carried to the CCM and sent to the next port, the method further includes: the receiving port determines the current link state of the CCM according to the link path record field, and according to the current chain of the CCM The road status is prompted. Preferably, the receiving port determines the current link state of the CCM according to the link path record field, and prompting according to the current link state of the CCM includes: recording the MAC address of the CCM passing port and the MAC address of the receiving port according to the link path record field Determining whether the link of the CCM is looped, and generating a corresponding alarm prompt when the link of the CCM is looped; and/or, the link path record field in the CCM received by the interface port this time is the last time The received link path record field in the CCM is compared to determine whether the link of the CCM is changed, and in the case where the link of the CCM is changed, a corresponding link change prompt is generated. Preferably, before the receiving port receives the CCM, the method further includes: the starting port adding a link path record field in the CCM, and setting the number of MPs passing through the CCM in the link path record field to 1, and starting The MAC address of the originating port is filled in the link path record field as the MAC address of the CCM path port. Preferably, updating the content of the link path record field further comprises: setting a link state identifier in the link path record field to 1 in case of a link change of the CCM; if the link of the CCM is unchanged Set the link state identifier in the link path record field to 0. Preferably, the content of the receiving port update link path record field includes at least one of the following: modifying the number of MPs that the CCM passes, modifying the link state identifier of the CCM, and adding the MAC address of the CCM transit port. In order to achieve the above object, according to another aspect of the present invention, a link tracking processing system is also provided. A tracking processing system for a link according to the present invention includes a start port, one or more intermediate ports, and a destination port, wherein the intermediate port includes: a receiving module configured to receive a CCM, wherein the CCM is carried for indicating The CCM passes the link path record field of the port; the update module is set to update the content of the link path record field; and the sending module is configured to carry the updated link path record field to the CCM and send it to the next intermediate port or Terminate the destination port. Preferably, the intermediate port further includes: a prompting module, configured to determine a current link state of the CCM according to the link path record field, and prompting according to the current link state of the CCM. Preferably, the prompting module is further configured to determine whether the link of the CCM is looped according to the MAC address of the CCM transiting port and the MAC address of the receiving port in the link path record field, and generate a corresponding link when the CCM link is looped. And/or, comparing the link path record field in the CCM received by the interface port with the link path record field in the CCM received last time, determining whether the link of the CCM is changed, and In the case of a link change of the CCM, a corresponding link change prompt is generated. Preferably, the start port includes: an adding module, configured to add a link path record field in the CCM; and a setting module, configured to set the number of MPs passing through the CCM in the link path record field to 1, and The MAC address of the originating port is filled in the link path record field as the MAC address of the CCM path port. Through the present invention, the method of carrying the link path record field for indicating the CCM path port in the CCM is adopted, and the problem that the fault location cannot be determined by using the continuity detection in the related art is solved, so that the system can use the CCM to track the link. The state improves the processing power of the system. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of a CCM message format definition according to the related art; FIG. 2 is a schematic diagram of an LTM message format definition according to the related art; FIG. 3 is a link tracking processing method according to an embodiment of the present invention; Figure 4 is a block diagram showing the structure of a tracking processing system for a link according to an embodiment of the present invention; Figure 5 is a block diagram showing the structure of a tracking processing system for a link according to a preferred embodiment of the present invention; 6 is a schematic diagram of a new field link path record field definition according to an embodiment of the present invention; and FIG. 7 is a schematic diagram of a CCM implementing link tracking detection under a networking condition according to an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. According to an embodiment of the present invention, a link tracking processing method is provided. FIG. 3 is a flowchart of a method for tracking a link according to an embodiment of the present invention. As shown in FIG. 3, the method includes the following steps: Step S302: A receiving port receives a continuity check message (CCM), where, in a CCM Carrying a link path record field for indicating a CCM path through port; Step S304, receiving the content of the port update link path record field, and carrying the updated link path record field to the CCM for transmission to the next port. Through the above steps, the method of carrying the link path record field for indicating the CCM path port in the CCM is adopted, and the problem that the fault location cannot be determined by using the continuity detection in the related art is solved, so that the system can use the CCM to track the link. The state improves the processing power of the system. Preferably, in step S304, before the updated link path record field is carried to the CCM and sent to the next port, the receiving port may determine the current link state of the CCM according to the link path record field, and according to the current CCM status. The link status is prompted. The method can effectively track the CCM in real time and notify the user of the status, which enhances the performance of the system and improves the user experience. Preferably, the receiving port determines the current link state of the CCM according to the link path record field, and prompting according to the current link state of the CCM includes: recording the MAC address of the CCM passing port and the MAC address of the receiving port according to the link path record field Determining whether the link of the CCM is looped, and generating a corresponding alarm prompt when the link of the CCM is looped; and/or, the link path record field in the CCM received by the interface port this time is the last time The received link path record field in the CCM is compared to determine whether the link of the CCM is changed, and in the case where the link of the CCM is changed, a corresponding link change prompt is generated. The method can make the user clearly know the routing status of the service, discover the link problem in time, and improve the effectiveness and accuracy of the system. Preferably, before step S302, the originating port may add a link path record field in the CCM, and set the number of MPs passing through the CCM in the link path record field to 1, and the MAC address of the start port. The address is filled in the link path record field as the MAC address of the CCM path port. The method is simple and practical, and has high operability. Preferably, in step S304, updating the content of the link path record field further includes: setting a link state identifier in the link path record field to 1 in the case of a link change of the CCM; In the case of no change, the link state identifier in the link path record field is set to zero. The method can detect the routing state of the CCM link, notify the user of the link change, and improve the system processing capability. Preferably, in step S304, the content of the receiving port update link path record field includes at least one of: modifying the number of MPs through which the CCM passes, modifying the link state identifier of the CCM, and adding the MAC address of the CCM way port. The method is simple and practical, and has high operability. Corresponding to the foregoing method, an embodiment of the present invention further provides a link tracking processing system. 4 is a structural block diagram of a link tracking processing system according to an embodiment of the present invention. As shown in FIG. 4, the system 40 includes a start port 42, one or more intermediate ports 44, and a destination port 46, where The intermediate port 44 includes: a receiving module 442, configured to receive a continuity detection message CCM, where the CCM carries a link path record field for indicating a CCM path port; an update module 444, coupled to the receiving module 442, configured to update The content of the link path record field; and the sending module, configured to carry the updated link path record field to the CCM for transmission to the next intermediate port or destination port. Through the above system 40, the method of carrying the link path record field for indicating the CCM path port in the CCM is adopted, and the problem that the fault location cannot be determined by using the continuity detection in the related art is solved, so that the system can use the CCM to track the link. The state of the system improves the processing power of the system. It should be noted that the start port 42, the intermediate port 44, and the destination port 46 referred to herein are for a certain

For the CC message (CCM), the CC message is initiated from the start port 42 and ends through one or more intermediate ports 44 to the destination port 46. For the case of a ring link, the originating port 42 may also be the destination port 46, and each port in the ring link may be the initiator of a certain CC message (δΡ, start port 42). . 5 is a structural block diagram of a link tracking processing system according to a preferred embodiment of the present invention. As shown in FIG. 5, the intermediate port 44 further includes: a prompting module 446 coupled to the updating module 444, configured to record a field according to the link path. Determine the current link state of the CCM and prompt according to the current link state of the CCM. Preferably, the prompting module 446 is further configured to determine whether the link of the CCM is looped according to the MAC address of the CCM transiting port and the MAC address of the receiving port in the link path record field, and generate the link when the CCM link is looped. Corresponding alarm prompts; and/or, the link path in the CCM received by the interface port this time The recorded field is compared with the link path record field in the last received CCM to determine whether the link of the CCM is changed, and in the case where the link of the CCM is changed, a corresponding link change prompt is generated. Preferably, the start port 42 includes: an add module 422 configured to add a link path record field in the CCM; and a setting module 424 coupled to the add module 422 and the receive module 442, configured to be in the link path record field The number of MPs passed by the CCM is set to 1, and the MAC address of the originating port is filled in the link path record field as the MAC address of the CCM path port. The implementation process of the above embodiment will be described in detail below in conjunction with the preferred embodiments and the accompanying drawings. Preferred Embodiment 1 This embodiment combines CC detection connectivity with LT link tracking detection, adds a field in a CC protocol message (ie, CCM) to implement the function of the LT, and detects the link path in real time. If a link is detected, the link protection can be started and switched to the protection link. If a link is detected, a warning can be generated. If a link change is detected, the link can also be made. Change the prompt. 6 is a schematic diagram of a new field link path record field definition according to an embodiment of the present invention. As shown in FIG. 6, a TIN field may be added to a CCM message, which is called a link path record field (Link Trace Record TIN). ), record the MAC address of the passed MP. For example, each MP of the CCM message path adds the MAC address of the port to the TIN field and saves it directly, so that the packets received by the MP through the path know all the paths that the CCM message has passed before. In the implementation process, the tracking processing method of the link in this embodiment may include the following steps: Step 1: The starting port (port 1) sends a CCM packet, where the link path record field in the packet includes the MAC address of port 1. MAC1, and the number of MPs passed by 1. Step 2: The CCM message is sent to the port 2 with the service, and the port 2 receives the parsed CCM message, saves the useful information, and modifies the link path record field in the CCM message, and adds the MAC address MAC2 of the port 2 at the end of the field. The number of MPs is incremented by 1, and then forwarded to the next port 3 with the service. The node in the network (that is, the intermediate port) repeats step 2 and sends it to the destination port. The destination port resolves the CCM packet. From the link path record field in the CCM packet, the MAC address of all ports through which the service passes can be obtained. address. This will let you know all the port paths that this service has passed. It can be seen that the CC connectivity check is to periodically send a packet to detect the connected line. The LT is the result of reporting the link path after the instance is enabled. According to the solution of the embodiment, the link can be performed in real time without manual operation. Tracking, quickly locate the faulty port, and obtain the network change according to the link tracking result. That is, if the link is protected, the protocol that needs to know the network path, such as STP, can directly obtain the link path that has been obtained. To operate, there is no need to recalculate the acquisition path, which can improve the processing efficiency of the system. Preferred Embodiment 2 FIG. 7 is a schematic diagram of implementing link tracking detection by a CCM under network conditions according to an embodiment of the present invention. As shown in FIG. 7, the MAC address of each port is indicated in the figure, in this embodiment. During the process of checking the connectivity check of the source port (that is, the start port) to the destination port, the service is forwarded through port 2 and port 3 and sent to the destination port through the network. As shown in Figure 6, MP Num indicates the number of MPs passing through, and the first one can be filled with 1; Link Status indicates whether the link changes, 0 indicates no change, and 1 indicates change. In the implementation process, the link tracking processing method may include the following steps: Step S702: The destination port sends a CCM packet to the port 1 (ie, the start port), and after receiving the CCM packet, the port 1 is in the packet. Increase the field. For example, for the first MEP, you can fill in 1 in MP Num, 0 in Link Status, and MAC address 00-00-00-00-00-01 in the local port at MAC address 1. Step S704, the CCM packet is received on the port 2, and the packet is parsed and processed, and the storage operation is performed. Port 2 sends a CCM packet to port 3 to modify the link path record field. For example, MP Num=2, MAC address2 is the MAC address of port 2 00-00-00-00-00-02. Step S706, the CCM message is received on the port 3, and the judgment is performed according to the CC protocol processing rule, and the storage operation is performed. When forwarding to the next port, MP Num is incremented by 1, and the MAC address of port 3 is added to the end of the link path record field 00-00-00-00-00-00-03. Step S708, all port processing in the network is similar to steps S404-S406. To ensure that the byte is too long, you can set Mp_Num <= 32. If it is greater than 32, MP Num=0, the MAC address is completely cleared, and then the MAC address of the local port is filled in the MAC address 1 byte. In step S710, the forwarding is performed multiple times. At the end point (ie, the destination port), the CCM packet is discarded after being processed, and is not forwarded. For example, by extracting the link path record field and doing the inbound operation, it is known that the CCM passes through those MAC addresses, thereby knowing the connection status of the MAC network. Preferably, in steps S704-S710, the MAC address in the link path record field may be checked. If it is the same, indicating that the link is looped, a broadcast storm may be caused, and a corresponding prompt is made. It is also possible to check when there is a change in the MAC address record. If there is a change, the path through which the data passes is not the same. Set Link Status to 1. If the link does not change as it was last time, Link Status is set to 0. You can also prompt the user that the path status of the link has changed. In summary, the embodiment of the present invention can be operated, managed, and maintained based on the IEEE 802.1ag standard Ethernet. It is a method for implementing link tracking monitoring in CFM, and the function of link tracking is integrated into the CC, which can be real-time. Tracking the link to solve the problem of using the continuity detection in the related art to determine the fault location, and improving the processing capability of the system. The various modules or steps of the present invention described above may be implemented on a general purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices, optionally, they may be calculated The program code executable by the apparatus is implemented such that they may be stored in the storage device by the computing device, and in some cases, the steps shown or described may be performed in an order different than that herein, or They are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for tracking a link, comprising the following steps:

The receiving port receives the continuity detection message CCM, where the CCM carries a link path record field for indicating the CCM path port;

The receiving port updates the content of the link path record field, and carries the updated link path record field to the CCM for transmission to the next port.

The method according to claim 1, wherein, before the updated link path record field is sent to the CCM and sent to the next port, the method further includes:

The receiving port determines a current link state of the CCM according to the link path record field, and prompts according to the current link state of the CCM.

The method according to claim 1 or 2, wherein the receiving port determines a current link state of the CCM according to the link path record field, and the prompting according to the current link state of the CCM includes:

Determining, according to the MAC address of the CCM way port and the MAC address of the receiving port in the link path record field, whether the link of the CCM is looped, and in a case where the link of the CCM is looped, Generate corresponding alarm prompts; and/or,

Comparing the link path record field in the CCM received by the interface port with the link path record field in the CCM received last time, determining whether the link of the CCM is changed, and In the event that the link of the CCM changes, a corresponding link change prompt is generated.

The method according to claim 3, wherein before the receiving port receives the CCM, the method further includes:

The originating port adds the link path record field in the CCM, and sets the number of MPs passing by the CCM in the link path record field to 1, and the MAC of the start port The address is filled into the link path record field as the MAC address of the CCM path port.

5. The method of claim 4, wherein updating the content of the link path record field further comprises: if the link of the CCM changes, the link in the link path record field The status flag is set to 1; in the case where the link of the CCM has not changed, the link status flag in the link path record field is set to zero. The method according to claim 1, wherein the receiving port updates the content of the link path record field to include at least one of: modifying the number of MPs through which the CCM passes, and modifying a link state of the CCM Identify and append the MAC address of the CCM transit port. A link tracking processing system includes a start port, one or more intermediate ports, and a destination port, where the intermediate port includes:

a receiving module, configured to receive a continuity detection message CCM, where the CCM carries a link path record field for indicating the CCM path port;

An update module, configured to update content of the link path record field;

And a sending module, configured to carry the updated link path record field to the CCM and send the message to the next intermediate port or the destination port. The system according to claim 7, wherein the intermediate port further comprises:

The prompting module is configured to determine a current link state of the CCM according to the link path record field, and prompt according to the current link state of the CCM. The system according to claim 7 or 8, wherein the prompting module is further configured to determine the link of the CCM according to a MAC address of the CCM way port and a MAC address of the receiving port in the link path record field Whether the loop is generated, and in the case that the link of the CCM is looped, a corresponding alarm prompt is generated; and/or, the link path record field in the CCM that the interface port receives this time Comparing with the link path record field in the last received CCM, determining whether the link of the CCM is changed, and in case the link of the CCM is changed, generating a corresponding link change prompt. The system according to claim 9, wherein the start port comprises:

Adding a module, configured to add the link path record field in the CCM; and setting a module, configured to set the number of MPs passing by the CCM in the link path record field to 1, and The MAC address of the originating port is filled in the link path record field as the MAC address of the CCM path port.