WO2011131069A1 - Binding links detection method and distributed device - Google Patents

Abstract

A method for detecting binding links and a distributed device are disclosed in the invention, wherein the detection method includes: a transmission end device sends connectivity check (CC) messages to a reception end device through all the member links of a binding link (S402); if the reception end device does not receive the CC message through one of the member links within a predetermined time, the state of the member link is determined to be abnormal (S404); and when the reception end device determines that the states of all the member links are abnormal, the state of the binding link is determined to be abnormal (S406). The invention can achieve the connectivity detection of binding links between the distributed devices in a Transport Multi-Protocol Label Switching (T-MPLS) network.

Description

 The present invention relates to the field of communications, and in particular to a method for detecting a bundled link and a distributed device. Background technique

T-MPLSC transport MPLS (Multi-Protocol Label Switching) technology is a new type of technology based on the needs of operators for packet transport networks.

MPLS, connection-oriented packet transport technology. T-MPLS provides a simplified, connection-oriented implementation based on widely used IP/MPLS technologies and standards. T-MPLS removes the functionality of MPLS that is not related to connection-oriented applications, while adding some features that are important to the transport network. Unlike MPLS, T-MPLS does not support connectionless mode, which is simpler to implement and easier to operate and manage than MPLS. T-MPLS eliminates the functional features associated with L3 and IP routing in MPLS, and its device implementation will meet operators' needs for low-cost and high-capacity next-generation packet networks. T-MPLS follows the existing idea of circuit-switched transport networks, using the same architecture, management and operational modes. T-MPLS will be used in the transport network for future operator packetization.

Many of the design ideas of T-MPLS have been widely used in traditional SDH (Synchronous Digital Hierarchy) networks, and operators are also based on this idea to operate and manage existing networks. Therefore, T-MPLS can be considered as an organic combination of mature TDM transport network operation mechanism and reliable packet network technology (MPLS). In addition, T-MPLS has major improvements to MPLS, such as bidirectional LSP (Label Switching Path), end-to-end LSP protection, and powerful OAM (Operation Administration and Maintenance) mechanisms. The effective control and use of the transmission network resources will be realized, thereby reducing the network operation cost. OAM is the core issue of T-MPLS and the root cause of changes in the T-MPLS standard. In order to improve the discovery capability of faults, the connectivity detection (CC) function is defined in T-MPLS. As shown in Figure 2, the essence of the bundling technology is to "combine" several physical links between two devices into one logical data path, called a bundle link. The link is logically a whole. The internal composition and details of the transmitted data are transparent to the upper layer. Several physical links inside the bundle link complete the data transmission and reception tasks and back up each other. As long as there are still working members, the entire bundled link will not expire. Bundling links have the following significant advantages over direct connections through physical ports between devices as shown in Figure 1:

1) Improve link availability: In bundled links, member links are dynamically backed up to each other. When a member link is broken, other member links can quickly take over their work. Unlike the spanning tree protocol, the process of enabling backup on a bundled link is invisible to the outside of the aggregate, and the backup process is enabled only within the bundled link, regardless of other links, and the switch can be completed in milliseconds. 2) Increase link capacity: Another obvious advantage of bundling technology is to provide users with an economical way to increase link transmission rates. By bundling multiple physical links, users can obtain a larger bandwidth data link without upgrading existing devices, and its capacity is equal to the sum of the physical link capacities. The bundle module allocates service traffic to different member links according to a certain algorithm to implement link-level load sharing. In some cases, bundling is even the only way to increase link capacity. For example, when devices on the market cannot provide links higher than 10G, users can aggregate two 10G links to obtain transmission lines with bandwidths greater than 10G. In addition, in a specific networking environment, it is necessary to limit the capacity of the transmission line, which is neither too low, affecting the transmission speed, nor too high, exceeding the processing capacity of the network. However, the prior art only supports link bandwidth growth of orders of magnitude, such as 10M, 100M, 1000M, and the like. By bundling n physical links, a more suitable n-bandwidth link can be obtained. Thanks to the above advantages, bundled links are widely used in T-MPLS active networks. However, in the existing solution, the CC function of the distributed device can only support one physical port to send protocol packets, that is, it can only detect the connectivity of the physical link directly connected between the devices through the physical port, but cannot implement the binding chain. The road is tested for connectivity. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a method for detecting a bundled link and a distributed device to solve at least the above problems. According to an aspect of the present invention, a method for detecting a bundle link is provided, including: a sender device sends a connectivity detection CC message to a receiver device through all member links in a bundle link; When the CC message of any member link is not received within the predetermined time, the status of the member link is abnormal. When the receiving device determines that the status of all member links is abnormal, the bundle link is determined. The status is abnormal. According to another aspect of the present invention, a distributed device is provided, including a line card, where the line card includes: a receiving module, configured to receive a connectivity detection CC report sent by the sending end device through all member links in the bundle link The member link state judging module is configured to determine that the status of the member link is abnormal when the CC message of any member link is not received within a predetermined time; If the status is abnormal, it is determined that the status of the bundled link is abnormal. According to the present invention, the receiving end device detects the CC message sent by the transmitting end device through all the member links of the bundling link, and determines the member link when the CC message on a certain member link is not received within a predetermined time. The status of the link is abnormal. When the status of all the member links is abnormal, the status of the bundle link is considered abnormal. This solves the problem that the related technology cannot implement connectivity detection for the bundle link. Detection of connectivity of bundled links between distributed devices in an MPLS network. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of a device directly connected through a physical port according to the related art; FIG. 2 is a schematic diagram of a device connected through a bundle interface according to the related art; FIG. 3 is a T-MPLS according to an embodiment of the present invention. FIG. 4 is a flowchart of a method for detecting a bundle link according to a first embodiment of the present invention; FIG. 5 is a bundle link of a distributed device according to Embodiment 2 of the present invention; Flowchart of connectivity detection; 6 is a schematic diagram of connection of a bundle interface between a router and an access network router and a switch according to a third embodiment of the present invention; and FIG. 7 is a schematic structural diagram of a distributed device 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. As shown in FIG. 3, in the T-MPLS network, the distributed device A and the distributed device B communicate through the bundle link 1 and the bundle link 2. 4 is a flowchart of a method for detecting a bundle link according to a first embodiment of the present invention, including the following steps: Step S402: A sender device sends a connectivity detection CC 4 to a receiver device through all member links in a bundle link. In the step S404, when the receiving device does not receive the CC message of any member link within a predetermined time, it determines that the status of the member link is abnormal; and in step S406, the receiving device determines all member chains. When the status of the path is abnormal, it is determined that the status of the bundle link is abnormal. In this embodiment, the receiving end device detects the CC message sent by the sending end device through all the member links of the bundling link, and determines the member when the CC message on a certain member link is not received within a predetermined time. The status of the link is abnormal (that is, an abnormality or fault occurs). When the status of all the member links is abnormal, the status of the link is considered abnormal (that is, an abnormality or fault occurs). The CC function of the distributed device can only support one physical port to send protocol packets. That is, the connectivity of the physical link directly connected to the physical port can be detected. . Can be implemented using this embodiment

Detection of connectivity of bundled links between distributed devices in a T-MPLS network. The bundle link may include two or more physical links (each physical link is called a member link). Preferably, step S402 includes: the sending end device sends a CC message by using a line card where all member links of the sending end device are located. The sender device master notifies all the line cards where the member ports of the bundle link are located (eg, periodically) to simultaneously transmit the CC 4 message. This embodiment provides a specific implementation manner in which a sending end device sends a CC message. All the line cards of the member ports corresponding to all the member links of the bundled link send CC packets at the same time to enable the receiving device to determine the status of the member links by detecting the receiving status of the CC packets and finally determine the bundle link. status. Preferably, the step S404 includes: the receiving end device receives the CC message by using the line card where any member link of the receiving end device is located, and simultaneously detects the receiving condition; the receiving end device does not receive the CC message within the predetermined time. The status of the member link is determined to be abnormal. This embodiment provides a specific implementation manner in which the receiving end device detects the status of the member link. The line card directly detects the reception of the CC message and makes a judgment, and the judgment is faster. The receiving of CC messages by each line card is detected at the same time (ie, in parallel), and the detection of the bundle link is not affected by the plugging and unplugging of some/some member line cards. Preferably, in the foregoing method, the method further includes: deleting, by the line cards where the member links are located, the states of the corresponding member links. In this way, the mutual backup of the status of the member links of the bundled link (that is, the full backup), for example, after the startup or during the detection process, the status of the member link is abnormal, and the line card of the other member link is notified. Implement mutual backup of the status of member links. In addition, the mutual backup of the status of the member link can also prevent the connectivity detection of the bundle link from being affected by the insertion and removal of the line card corresponding to the link of the member link. Preferably, the step S406 includes: when the receiving end device does not receive the CC message within the predetermined time by the line card where the member link of the receiving end device is located, the line card on the receiving end device determines whether the line card is normal. The member link; if there is no normal member link, the line card on the receiving device notifies the main control module in the receiving device, and the status of the bundling link is abnormal. That is, when a line card on the receiving device finds that the status of all the link members of the bundle link is abnormal, and the physical port link is abnormal, the link bundle link is abnormal. At this time, the bundle link cannot transmit packets. When the receiving device determines that there is a normal member link, it determines that the state of the bundled link is normal. That is, as long as the status of one member link is normal and the status of the entire bundle link is normal, the packet can be transmitted. The preferred embodiment provides a specific implementation manner in which the receiving end device determines that the state of the bundled link is abnormal (that is, the bundle link is abnormal or faulty). Because the line cards back up the state of the member links corresponding to each other, that is, each line card has the status of all member links, therefore, when When the line card determines that the status of the member link corresponding to the link is abnormal, the line card can directly determine whether the status of the other member links is abnormal. If yes, it determines that the bundle link is abnormal. The judgment of the state of the bundled link directly by the line card can greatly shorten the judgment time, determine the speed faster, and meet the requirements of the related technology for high reliability requirements (such as voice service, etc.). Preferably, in the foregoing method, the method includes: if a normal member link exists, the line card where the abnormal member link on the receiving device is located is connected to the member link of the receiving device except the abnormal member link. The line card broadcasts a message that the status of its corresponding member link is abnormal. The preferred embodiment provides a specific implementation in which the receiving end device determines that the state of the bundled link is normal. Because the line cards back up the state of the member links corresponding to each other, that is, each line card has the status of all member links. Therefore, when a line card determines the status of the member link corresponding to it If the fault is abnormal, the line card can directly determine whether the status of the other member links is abnormal. If not, determine that the status of the bundle link is normal. The judgment of the state of the bundled link directly by the line card can greatly shorten the judgment time, determine the speed faster, and meet the requirements of the related technology for high reliability requirements (such as voice service, etc.). When it is judged that there are other bundle links whose status is normal, the transmission data can be directly switched, so that the transmission of data is not interrupted. As shown in FIG. 3, the distributed device A and the distributed device B can be the transmitting end and the receiving end of each other, and the connectivity detection of the bundled link 1 and the bundled link 2 is performed by the above method. In the second embodiment, the method for detecting the bundle link of the present invention is described by taking the distributed device A in FIG. 3 as the router A and the distributed device B as the router B as an example. Traffic between the router A and the router B is carried. To prevent the loss of long-term traffic due to the interruption of the physical link, the traffic is carried over the bundle interface between the router A and the router B. The bundled link 2 carries the service.) At the same time, the bundle interface backup is performed between the router A and the router B to protect the bundle interface itself. This requires the CC function of the T-MPLS OAM to detect the state of the bundle link. FIG. 5 is a flowchart of connectivity detection of a bundle link of a distributed device according to Embodiment 2 of the present invention. First, you need to create and configure bundled link 1 and bundle link 2 on Router A and Router B. The physical interface of the BFD is bound to the corresponding bundle interface (that is, the physical link is added to the corresponding bundle link;) Then deploy the CC function of the T-MPLS OAM (that is, start the CC detection function of the bundle link) to detect the bundle link 1 and the bundle link 2 respectively! state. As shown in FIG. 5, the process of the method for detecting a bundle link according to the second embodiment specifically includes the following steps: Step S502: Configure a CC detection function for starting T-MPLS OAM on Router A and/or Router B; Step S504, The master notifies the CC function parameter of the line card where the member ports corresponding to all the member links of the bundle link 1 and the bundle link 2 are located, and the line card simultaneously sends the CC message according to the CC function parameter and starts detecting at the same time; S506: If the line card corresponding to one of the link links 1 or the link 2 of the bundle link 2 does not receive the CC message of the peer end within the detection time (that is, the predetermined time), a physical port chain is generated. Step S508: The physical port link abnormal event needs to be separately processed according to the detection status of the sibling member link, and the line card determines whether the bundle link to which it belongs (assumed to be the bundle link 1) is detected. The status is normal other sibling member links, and if yes, go to step S510, if no, go to step 4 to gather S512; step S510, the line card broadcasts that the bundle link 1 corresponds to Line card detection state of this link member (i.e., the state of the line card corresponding to the members of the link is abnormal message); step S512, the notification directly to the line card of the master device 1 as a whole bundle link is abnormal. FIG. 6 is a schematic diagram of connection of a bundle interface between a router and an inter-network router and a switch according to a third embodiment of the present invention. An operator deploys a bundled interface between the skeletal network and the access network to carry the service on the 7-port (that is, the bundled link is used to carry the service). The bundled link needs to be detected by the CC function of the T-MPLS OAM. As shown in Figure 6, Router A, Router B, and Router C form the backbone network of the carrier. Switch A and Switch B are access-side devices. Configure the bundle interface and bundle link between Switch A and Router A. Since the other switch B wants to know the state of the bundle link between the switch A and the router A, the CC function of the T-MPLS OAM is deployed between the switch A and the router A to detect the state of the bundle link. Step 1, switches and routers A configuration bundle interface A 1, ^ ¹ and the physical interface bundle into a bundle interface (i.e. links are created and configured on the bundle switch router A 1 and A (i.e., bundled The binding link corresponding to interface 1 adds the physical link (that is, the physical link corresponding to the physical interface) to the corresponding bundle link 1;); Step 2, configure bundle interface 1 to start T-MPLS. The CC function of the OAM is used to detect the state of the bundled link 1. Step 3: At some point, if the bundle link is detected according to the above detection method of the bundled link

If the status of 1 is normal, the user traffic is forwarded. Step 4: At a certain time, if the detection of the bundle link is abnormal according to the detection method of the bundle link, the state of the bundle link 1 is set to be abnormal. And block the forwarding of user traffic. FIG. 7 is a schematic structural diagram of a distributed device according to an embodiment of the present invention. As shown in FIG. 7, the distributed device 1 includes: a line card 10, comprising: a receiving module 101, configured to receive a connectivity detection CC message sent by a sending end device through all member links in a bundle link; The link state determining module 102 is configured to determine that the status of the member link is abnormal when the receiving module 101 does not receive the CC message of any member link within a predetermined time; When the status of the path is abnormal, it is determined that the status of the bundled link is abnormal. Preferably, the line card 10 further includes: a sending module 103, configured to notify the main control module 20 that the state of the bundling link is abnormal when the member link state determining module 102 determines that the status of all the member links is abnormal; The distributed device 1 further includes: a main control module 20 configured to receive a notification that the bundle link status of the line card 10 is abnormal, and perform subsequent processing. The member link state determining module 102 is further configured to determine whether there is a normal member link when the receiving module 101 does not receive the CC message within a predetermined time. Preferably, the sending module 103 is further configured to: when the member link state determining module 102 determines that there is a normal member link, broadcast the corresponding line card to the distributed device 1 except the member link other than the abnormal member link. The status of the member link is an abnormal message. The distributed device of the above embodiment detects the connectivity of the bundle link by using the above-described detection method of the bundle link. It can be seen from the above description that the present invention achieves the following technical effects: The present invention solves the problem that the related art cannot implement connectivity detection for a bundled link, thereby enabling inter-distributed devices in a T-MPLS network. The connectivity of the bundle link is detected. The status of the member links of the bundle link is backed up by each other and is not affected by the insertion and removal of the line card corresponding to the member link in the bundle link. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, 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 scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim A method for detecting a bundle link, comprising:  The sender device sends a connectivity detection CC message to the receiver device through all member links in the bundle link.  When the receiving end device does not receive any of the member links within a predetermined time When the CC packet is received, the status of the member link is abnormal.  When the receiving end device determines that the status of all the member links is abnormal, it determines that the status of the bundled link is abnormal. The method according to claim 1, wherein the sending end device sends the connectivity detection to the receiving end device by using all the member links in the bundling link.  The sending end device sends the message by using a line card where all member links on the sending end device are located. The method according to claim 1, wherein, when the receiving end device does not receive any CC message of the member link within a predetermined time, determining that the status of the member link is abnormal includes :  Receiving, by the receiving end device, the CC 4 message by using a line card where any member link of the receiving end device is located, and simultaneously detecting the receiving condition;  When the receiving end device does not receive the CC message within the predetermined time, it determines that the status of the member link is abnormal. The method according to claim 2 or 3, further comprising: the line cards where the one of the member links are located back up each other to the state of the corresponding member link. The method according to claim 1, wherein, when the receiving end device determines that the status of the all member links is abnormal, determining that the status of the bundle link is abnormal includes: when the receiving When the end device does not receive the CC message within the predetermined time by the line card where the member link of the receiving device is located, the line card on the receiving device determines whether there is a normal member chain. road; If there is no normal member link, the line card on the receiving end device notifies the main control module in the receiving end device that the status of the bundling link is abnormal. The method according to claim 5, wherein, if there is a normal member link, the line card where the abnormal member link on the receiving end device is located removes the abnormal member chain from the receiving end device The line card where the member links other than the road are located broadcasts the message that the status of the corresponding member link is abnormal. 7. A distributed device, comprising a line card, the line card comprising:  The receiving module is configured to receive, by the sending end device, the connectivity detection CC message sent by all the member links in the bundle link;  The member link state judging module is configured to determine that the status of the member link is abnormal when the CC message of the member link is not received within a predetermined time; If the status of the link is abnormal, it is determined that the status of the bundle link is abnormal. The distributed device according to claim 7, wherein the line card further comprises: a sending module, configured to: when the member link state determining module determines that the states of all the member links are abnormal, Notifying the main control module that the status of the bundle link is abnormal;  The distributed device further includes: the main control module, configured to receive a notification that the bundle link status of the line card is abnormal, and perform subsequent processing. The distributed device according to claim 7, wherein the member link state determining module is further configured to determine whether a normal member link exists when the CC message is not received within the predetermined time. The distributed device according to claim 9, wherein the sending module is further configured to: when the member link state determining module determines that a normal member link exists, to the receiving device The line card where the member links other than the abnormal member link are located broadcasts the message that the status of the corresponding member link is abnormal.