WO2011020261A1 - Procede et systeme de protection pour mecanisme double transmission dans un reseau annulaire - Google Patents

Procede et systeme de protection pour mecanisme double transmission dans un reseau annulaire Download PDF

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Publication number
WO2011020261A1
WO2011020261A1 PCT/CN2009/075411 CN2009075411W WO2011020261A1 WO 2011020261 A1 WO2011020261 A1 WO 2011020261A1 CN 2009075411 W CN2009075411 W CN 2009075411W WO 2011020261 A1 WO2011020261 A1 WO 2011020261A1
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WO
WIPO (PCT)
Prior art keywords
service
path
protection
working path
protection path
Prior art date
Application number
PCT/CN2009/075411
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English (en)
Chinese (zh)
Inventor
刘国满
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2011020261A1 publication Critical patent/WO2011020261A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/22—Alternate routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery

Definitions

  • the present invention relates to the field of ring network protection technologies, and in particular to a protection method and system for a ring network dual-issue mechanism. Background technique
  • the ring network In the current packet transmission network, the ring network is widely used in the actual network because it is relatively simple and reliable in comparison with other networks with other topologies.
  • MPLS multi-protocol label switching
  • the existing ring network such as the MPLS ring network
  • SDH Synchronous Digital Hierarchy
  • SONET Synchronous Optical Network
  • the existing ring network protection methods are based on the fault detection and protection of the Label Switching Path (LSP) layer.
  • LSP Label Switching Path
  • the main object of the present invention is to provide a protection method for a ring network dual-issue mechanism. And the system can reduce the overhead of OAM packets and perform fast path protection and fault recovery when the data ring network fails.
  • the present invention provides a method for protecting a ring network dual-issue mechanism, the method comprising:
  • the service sending node sends the service packets to the service receiving node along the working path and the protection path of the ring network respectively;
  • the service receiving node performs service performance statistics according to the service status of the service path and the protection path, and selects the service packet received on the working path or the protection path according to the result of the service performance statistics. deal with.
  • the processing of the service packet received on the working path or the protection path is performed according to the result of the service performance statistics, specifically:
  • the service packet received on the working path is selected to be processed, and the protection path is received. Discarded service packets;
  • the service packet received on the working path is selected to be processed
  • the service packet received on the protection path is selected to be processed.
  • the service performance statistics are performed according to the reception status of service packets on the working path and the protection path, which are specifically:
  • the service receiving node starts from receiving the first service packet, and the initialization timer counts the receipt of the service packet. If the service packet on the working path is received before the timer expires, the working path is determined. Normal, otherwise, it is determined that the working path is faulty;
  • the method further includes: pre-configuring a working path and a protection path for transmitting the service packet on the ring network.
  • the method further includes: when the working path and the protection path are deleted, the service receiving node stops performing service performance statistics on the working path and the protection path.
  • the method further includes: when there is an intermediate node between the service sending node and the service receiving node, the intermediate node transparently transmits the service packet sent by the service sending node to the service receiving node.
  • the present invention also provides a protection system for a ring network dual-issue mechanism, the system comprising: a service sending node and a service receiving node, where
  • the service sending node is configured to perform dual-issue of service packets to the service receiving node along the working path and the protection path of the ring network respectively;
  • the service receiving node is configured to perform service performance statistics according to the service status of the service path and the protection path, and select a service received on the working path or the protection path according to the result of the service performance statistics.
  • the message is processed.
  • the service receiving node is further configured to: select, according to a result of the service performance statistics of the working path and the protection path, a service packet received on the working path when determining that the working path and the protection path are both normal The processing is performed, and the service packet received on the protection path is discarded.
  • the service packet received on the working path is selected to be processed; If the path is normal and the working path is faulty, you can choose to process the service packets received on the protection path.
  • the service receiving node is further configured to: start the timer from the start of receiving the first service packet, and determine that the working path is normal if the service packet on the working path is received before the timer expires. Otherwise, it is determined that the working path is faulty; if the service packet on the protection path is received before the timer expires, it is determined that the protection path is normal, otherwise, the protection path is determined to be faulty.
  • the service receiving node is further configured to stop performing service performance statistics on the working path and the protection path when the working path and the protection path are deleted.
  • the system further includes: an intermediate node, configured to transparently transmit the service text sent by the service sending node to the service receiving node.
  • the protection scheme of the ring network dual-issue mechanism of the present invention determines that the service packets received on the working path or the protection path need to be processed by the service receiving node to perform service performance statistics on the working path and the protection path corresponding to the two ports. .
  • the service performance statistics are based on the timer of the service receiving node itself, and the OAM packet is not required to detect the status of the two ports (ie, the working path and the protection path service performance). Therefore, the overhead of the OAM packet is saved.
  • the present invention simultaneously and continuously counts the service performance of the working path and the protection path, when a single point failure occurs on the ring network, or multiple points of failure occur, the service receiving node can immediately calculate the service performance result according to the path. Switch to a path with good service performance and receive and process service packets through the corresponding port, so that path protection and fault recovery can be performed quickly.
  • FIG. 1 is a schematic flowchart of a dual-issue mechanism protection method for a ring network according to the present invention
  • FIG. 2 is a schematic diagram of a process of performing service performance statistics on a working path and a protection path by a service receiving node;
  • FIG. 3 is a schematic diagram of a process of receiving and processing a service packet by a service receiving node;
  • FIG. 4 is a schematic diagram of a ring network structure of a single point of failure;
  • Figure 5 is a schematic diagram of a ring network structure with multiple points of failure
  • FIG. 6 is a schematic structural diagram of a dual-issue mechanism protection system for a ring network according to the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical solutions of the present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.
  • the protection process of the ring network dual-issue mechanism of the present invention is shown in FIG. 1 and includes: Step 101: The service sending node performs dual transmission of service packets to the service receiving node along the working path and the protection path of the ring network.
  • Step 102 The service receiving node performs service performance statistics according to the service path and the service status of the protection path, and selects the service packet received on the working path or the protection path according to the result of the service performance statistics.
  • Step 101 The service sending node sends the service packets to the service receiving node along the working path and the protection path of the ring network.
  • the path on the ring network is configured as a working path and a protection path in advance, and the direction in which the service packets are transmitted is opposite. If the working path direction is a clockwise direction on the ring network, the protection path is on the ring network. Counterclockwise; vice versa.
  • the service sending node When the service sending node sends a service packet to the service receiving node, it needs to send the two-way transmission along the working path and the protection path respectively.
  • the intermediate node is only responsible for transparent transmission for service packets, and does not process the service text. It should be noted that, for a service packet, if there is only one service receiving node, the node processes the packet after receiving the service packet, and does not forward the service packet; If the service receiving node receives the service packet, the service receiving node needs to process the packet and forward the service packet until the last service receiving node.
  • Step 102 The service receiving node performs service performance statistics according to the service path and the service status of the protection path, and selects the service packet received on the working path or the protection path according to the result of the service performance statistics.
  • Step 201 The service receiving node starts from receiving the first service packet, and initializes a timer. Timed receipt of service messages.
  • the duration of the timer can be set as needed.
  • the duration of the service packet from the service sending node to the service receiving node may be estimated, and an empirical value is obtained, and the experience value is set to ⁇ , that is, an average of the service packet from the service sending node to the service receiving node.
  • the period of the timer in the present invention may be 2.5 ⁇ , 3 ⁇ , 4 ⁇ , or the like.
  • the service receiving node receives the service text from its own two ports, which are respectively connected to the working path and the protection path. Regardless of the port from which the service receiving node receives the first service packet, the service packet initializes its own timer and starts receiving the next service packet for the two ports (corresponding to the working path and the protection path). Timed.
  • Step 202 Determine whether the service packet on the current path is received before the timer expires. If yes, go to step 203 to determine that the current path is normal. If no, go to step 204 to determine that the current path is faulty.
  • the service node needs to perform statistics on the service performance of the working path and the protection path at the same time and continuously, and obtain corresponding service performance statistics. However, if the current working path or protection path is deleted due to network topology changes, etc., the service receiving node stops performing service performance statistics on the working path or the protection path.
  • the service node determines whether it receives the next service packet before the timer expires.
  • the timer is When the service packet is not received before the first timeout, the timer can be initialized again. When the service packet is not received before the timer expires for the second time, the timer can be initialized for the third time. If the service packet is not received before, the process proceeds to step 204, and the current path is faulty, and the service is poor. If the service packet is received before the third timeout of the timer, step 203 is performed to determine that the current path is normal, and the service performance is good. .
  • the status of the current path may be determined.
  • the status of the current path obtained in step 203 and step 204 is the service performance statistics result on the current path (working path or protection path).
  • the service receiving node processes the service packets received on the working path or the protection path according to the result of the service performance statistics.
  • the process shown in Figure 3 can be used, including:
  • Steps 301 to 302 Determine whether the working path and the protection path are normal. If yes, process the service packet received on the working path; if no, go to step 303.
  • the service receiving node determines whether the working path and the protection path are normal. If both are normal, the service packet received on the working path is selected. If the service packets received on the protection path are discarded, no processing is performed. If the two are not normal, go to step 303.
  • Step 303 Determine whether the working path is faulty. If no, go to step 302 to process the service packet received on the working path; if yes, go to step 304.
  • step 304 is performed.
  • Steps 304 to 305 determining whether the protection path is faulty. If no, step 305 is performed to process the service packet received on the protection path. If yes, in step 306, the service receiving node cannot receive the service packet.
  • the service receiving node can process the service packet according to the following strategy: According to the result of the service performance statistics of the working path and the protection path, when determining that the working path and the protection path are normal, select the working path. The received service packet is processed, and the service packet received on the protection path is discarded.
  • the service packet received on the working path is selected to be processed
  • the service packet received on the protection path is selected to be processed. It should be noted that the service receiving node needs to continuously perform statistics on the service performance of the working path and the protection path. If the service receiving node receives the service packet from the protection path and processes the fault, the service receiving node recovers immediately. Switch from the protection path to the working path to receive and process service messages.
  • the service packet is a point-to-point (P2P) packet
  • the node 2 is a service sending node
  • the node 8 is a service receiving node
  • the node 2 sends a P2P text to the node 8 along the working path and the protection path respectively.
  • P2P point-to-point
  • the working path between the node 5 and the node 6 is faulty, and the service receiving node 8 counts the service performance of the working path and the protection path by means of the method of FIG. 2, and can obtain: the working path is faulty, and the protection path is normal. Therefore, the node 8 cannot receive the service packet from the working path, and processes the service packet received on the protection path. If the node 8 receives and processes the P2P text from the protection path, the failure between the node 5 and the node 6 is restored, and the node 8 immediately switches to the working path to receive and process the P2P message.
  • node 3 is a service sending node
  • node 5 and node 7 are service receiving nodes
  • service packets are point-to-multipoint primary station (P2MP) messages
  • node 3 goes to node 5 and node 7 along the working path and the protection path respectively.
  • the working path between the node 5 and the node 6 is faulty.
  • the node 5 and the node 7 count the service performance of the working path and the protection path by the method of FIG. 2, and can obtain: For the node 5, the working path and the protection path are both Normally, the node 5 processes the P2MP packet received on the working path.
  • the working path fails and the protection path is normal. Therefore, the node 7 processes the P2MP packet received on the protection path.
  • FIG. 5 is a schematic diagram of a ring network structure with multiple points of failure.
  • the path in the clockwise direction of the pre-configuration diagram is the working path
  • the path in the counterclockwise direction is the protection path
  • the service packet is P2P 4
  • the node 2 is the service.
  • Nodes, node 8 is a service receiving node, and node 2 sends P2P packets to the node 8 along the working path and the protection path, respectively.
  • the working path between the node 4 and the node 5 fails, the protection path between the node 6 and the node 7 fails, and the service receiving node 8 counts the service performance of the working path and the protection path by the method of FIG. You can get: The working path is faulty and the protection path is normal. Therefore, the node 8 cannot receive service packets from the working path and processes the service packets received on the protection path.
  • the node 3 is a service sending node
  • the node 5 and the node 7 are service receiving nodes
  • the service packet is a P2MP packet
  • the node 3 sends the P2MP text to the node 5 and the node 7 along the working path and the protection path respectively.
  • the working path between the node 4 and the node 5 fails, and the protection path between the node 6 and the node 7 fails.
  • the node 5 and the node 7 count the service performance of the working path and the protection path by the method of FIG. 2, and can obtain: For node 5, both the working path and the protection path are faulty. Therefore, node 5 becomes an isolated node and cannot receive service packets. For node 7, the working path fails and the protection path is normal. Therefore, node 7 is correct.
  • the P2MP packet received on the protection path is processed. If node 7 receives and processes a P2MP message from the protection path and the failure between node 4 and node 5 is restored, node 7 immediately switches to the working path to receive and process the P2MP message.
  • the present invention further provides a protection system for a ring network dual-issue mechanism, as shown in FIG. 6, including: a service sending node 10 and a service receiving node 20, where
  • the service sending node 10 is configured to perform dual-issue of service packets to the service receiving node 20 along the working path and the protection path of the ring network respectively;
  • the service receiving node 20 is configured to perform service performance statistics according to the service status of the service path and the protection path, and select the service packet received on the working path or the protection path according to the result of the service performance statistics.
  • the service receiving node 20 is further configured to: according to the result of the service performance statistics of the working path and the protection path, when determining that the working path and the protection path are normal, selecting to process the service packet received on the working path, and processing the protection path If the working path is normal and the protection path is faulty, the service packet received on the working path is selected. When the protection path is normal and the working path is faulty, the protection path is selected. The received service packet is processed.
  • the service receiving node 20 is further configured to: start the timer from the start of receiving the first service packet, and if the service packet on the working path is received before the timer expires, determine that the working path is normal, otherwise, determine The working path is faulty. If the service packet on the protection path is received before the timer expires, the protection path is determined to be normal. Otherwise, the protection path is determined to be faulty.
  • the service receiving node 20 is further configured to stop the service performance statistics of the working path and the protection path when the working path and the protection path are deleted.
  • the system further includes: an intermediate node 30, configured to transparently transmit a service packet sent by the service sending node 10 to the service receiving node 20. Since the service transmitting node 10 and the service receiving node 20 may be directly connected, the intermediate node 30 is optional.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un procédé de protection pour mécanisme double transmission dans le réseau annulaire. Le procédé comporte notamment les étapes suivantes: un noeud de transmission de service qui transmet un message de service de manière bidirectionnelle à un noeud de réception de service le long d'un chemin de travail et d'un chemin de protection d'un réseau annulaire respectivement; le noeud de réception de service effectue les statistiques d'efficacité du service selon l'état de réception du message de service sur le chemin de travail et le chemin de protection, et choisit le message de service reçu sur le chemin de travail ou le chemin de protection pour procéder selon le résultat des statistiques d'efficacité du service. L'invention concerne également un système de protection pour mécanisme double transmission dans un réseau annulaire, qui permet de réduire la surcharge d'un message OAM (Opération, Administration et Maintenance), et qui peut réaliser la protection rapide du chemin ainsi que la récupération de la défaillance lorsqu'elle survient dans le réseau de données annulaire.
PCT/CN2009/075411 2009-08-20 2009-12-08 Procede et systeme de protection pour mecanisme double transmission dans un reseau annulaire WO2011020261A1 (fr)

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CN200910091034.5A CN101997753B (zh) 2009-08-20 2009-08-20 一种环网双发机制的保护方法和系统
CN200910091034.5 2009-08-20

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CN104618165A (zh) * 2015-02-13 2015-05-13 上海小蚁科技有限公司 一种网络评估方法及装置

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US20060209860A1 (en) * 2005-03-18 2006-09-21 Fujitsu Limited Method and apparatus for allocating label to path in ring network
CN1838606A (zh) * 2005-03-24 2006-09-27 华为技术有限公司 使用mpls建立信令传递网用于mesh网保护的方法
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CN104618165B (zh) * 2015-02-13 2018-04-13 上海小蚁科技有限公司 一种网络评估方法及装置

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