WO2012037754A1 - Procédé et dispositif de noeud pour la réalisation d'une commutation de protection linéaire bidirectionnelle pour une section de multiplexage - Google Patents

Procédé et dispositif de noeud pour la réalisation d'une commutation de protection linéaire bidirectionnelle pour une section de multiplexage Download PDF

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Publication number
WO2012037754A1
WO2012037754A1 PCT/CN2010/079521 CN2010079521W WO2012037754A1 WO 2012037754 A1 WO2012037754 A1 WO 2012037754A1 CN 2010079521 W CN2010079521 W CN 2010079521W WO 2012037754 A1 WO2012037754 A1 WO 2012037754A1
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WIPO (PCT)
Prior art keywords
bridging
switching
decision mode
node device
request
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PCT/CN2010/079521
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English (en)
Chinese (zh)
Inventor
吴青
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中兴通讯股份有限公司
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Publication of WO2012037754A1 publication Critical patent/WO2012037754A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/14—Monitoring arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0057—Operations, administration and maintenance [OAM]
    • H04J2203/006—Fault tolerance and recovery

Definitions

  • the present invention relates to the field of optical network technologies, and in particular, to a method and a node device for implementing bidirectional linear protection switching of a multiplex section.
  • both ends of the node device send NR0,0 signaling (NR is no request, both the request bridge signal and the bridged signal are 0).
  • NR no request
  • both the request bridge signal and the bridged signal are 0.
  • SD2,0 requests the peer bridge signal
  • the right end node device After the right end node device completes the signal 2 bridging, it sends RR2, 2 (reverse request, the requesting peer also bridges the signal 2, and informs the peer end that the signal 2 bridge is completed); the left end node device completes the bridging of the signal 2 And switching, sending SD2, 2 (notifying the opposite end that the signal 2 is bridged); the right end node device completes the signal 2 switching.
  • the right end node device When the right end node device detects that the signal 3 is interrupted, it sends SF3, 2 (requests the peer bridge signal 3, notifying that the peer is still in the state of the bridge signal 2) The left end node device cancels the bridge switching of signal 2, and performs the bridging of signal 3. Then, it transmits RR3, 3 (reverse request, requests the peer bridge signal 3, and informs the opposite end that the signal 3 bridge is completed); the right end node The device completes the bridge of signal 3, sends SF3, 3 (notifies the peer that the signal 3 is bridged). The left end node device completes the signal 3 switching.
  • the right end node device When the right end node device detects the failure recovery of the working channel 3, it sends WTR3, 3 (notifies the peer end to enter the switching for the recovery state). The left end node device is still degraded due to the working channel 2, so after the switching of the undo signal 3, the sending is performed.
  • SD2,3 request peer bridge signal 2, because SD priority is higher than WTR
  • right end device undo signal 3 switching and complete signal 2 bridge send RR2, 2 (reverse request, request peer also bridge signal 2, and inform the opposite end of the completion of the signal 2 bridge); the left end node device completes the bridging and switching of signal 2, sends SD2, 2; the right end node device completes the signal 2 switching.
  • the node device (the local end) first notifies the peer end to bridge the corresponding signal, and then the local end bridges the bridge, and the local end performs the bridge switching, and then the opposite end completes the switching, and the signaling needs to be performed. After the three-way interaction, the bridge switching between the two ends is performed. The decision of the APSs at both ends of the bridge switching process must be performed twice, and the service switching time is longer.
  • the technical problem to be solved by the present invention is to provide a method and a node device for implementing bidirectional linear protection switching of a multiplex section, so as to improve the multiplexing section 1 without affecting the connection with the device running the standard protocol: N bidirectional linear protection switching efficiency.
  • the present invention provides a method for implementing bidirectional linear protection switching of a multiplex section. The method includes: after the node device calculates the bridging request with the highest priority in the protection group, performing bridging and switching of the bridging request corresponding service according to the first decision mode.
  • the step of the bridging and switching of the bridging request corresponding service by the node device according to the first decision mode includes: if the node device determines that the node device is configured in the first decision mode, performing bridging of the bridging request corresponding service Switched.
  • the step of the bridging and switching of the bridging request corresponding service by the node device according to the first decision mode includes: if the node device determines that the received multiplex section cost K2 indicates the first decision mode, the bridging request is performed. Correspond to the bridging and switching of services.
  • the method further includes: saving the first decision mode; and performing the bridging request according to the first decision mode
  • the method further includes: transmitting a multiplexing segment overhead K2 indicating the first decision mode.
  • the method further includes: if the node device receives the switching control information sent by the network management, and determines that the switching control information is carried The decision mode is different from the currently executed decision mode, and the decision mode mismatch information is reported to the network management.
  • the present invention further provides a node device, including at least one working port and one protection port, where the working port and the protection port interact with an automatic protection switching (APS) module, where: the APS module is configured.
  • the APS module is configured. After the bridging request with the highest priority in the protection group is calculated, bridging and switching of the service corresponding to the bridging request is performed according to the first decision mode.
  • the APS module is configured to perform the bridging request according to the first decision mode as follows Bridging and switching of the corresponding service: If it is determined that the device of the node is configured in the first decision mode, the bridging and switching of the service corresponding to the bridging request is performed.
  • the APS module is configured to perform bridging and switching of the bridging request corresponding service according to the first decision mode as follows: if it is determined that the received multiplex section overhead K2 byte indicates the first decision mode, the bridging is performed. Request bridging and switching of the corresponding service.
  • the APS module is further configured to: save the first decision mode, and further, after completing bridging and switching, send a multiplexing segment overhead K2 indicating the first decision mode.
  • the APS module is further configured to: if receiving the switching control information sent by the network management, and determining that the decision mode carried by the switching control information is different from the currently executed decision mode, reporting the decision mode mismatch information to the network management.
  • the invention provides a method and a node device for realizing the bidirectional linear protection switching of the multiplex section, and reduces the three interactions of the protocol bytes in the switching process to one interaction, and the corresponding decision processing is only one time, which can greatly improve the multiplexing section.
  • N bidirectional linear protection switching efficiency, thus making up for the deficiencies of other processing units, in particular, the implementation of the multiplex section protection decision is optimized, then the corresponding requirements for other processing units will be reduced accordingly. For example, after the switching efficiency is improved, the requirements for fast detection of alarms can be reduced accordingly.
  • the alarms are quickly detected by hardware, which can relatively reduce some parameters of the hardware.
  • the announcement phase mode also enhances controllability.
  • FIG. 1 is a schematic diagram of a multiplex section 1: N bidirectional linear protection switching 3-phase APS message flow;
  • FIG. 2 is a schematic diagram of a node device according to an embodiment of the present invention;
  • FIG. 4 is a flow chart of a PST bidirectional linear protection switching 1-phase APS message flow according to the present invention;
  • FIG. 5 is a 1-phase node device and a 3-phase node of the present invention; Schematic diagram of the APS message flow of the device's docking.
  • the preferred embodiment of the present invention performs the switching process in Ethernet protection switching (G.8031) and Transport Multi-Protocol Label Switching (T-MPLS) linear protection switching (G.8131).
  • the present invention proposes to implement 1-phase execution in the multiplex section bidirectional 1:N linear protection, mainly to identify the phase in the signaling, and indicate the decision mode of the local end to the opposite end, and negotiate the two ends. Decision-making mode, making protection decisions in a unified mode. At the same time, it also considers the docking of the original processing.
  • the method proposed in this paper also applies to the optical transport network (OTN) linear protection specified in G.873.1.
  • the multiplex section 1:N bidirectional linear protection decision uses the 1-phase method. After the node calculates the bridge request with the highest priority in the protection group, it directly completes the bridging of the maximum request corresponding service. Switching, and sending the request to the peer. After receiving the request, if the peer confirms that it is the largest request, it also completes the bridge switching, and the service is restored.
  • the multiplex section overhead is K2 bytes of b6-b8.
  • the existing standards are defined as follows: 000 00 001-101 Reserved 110 MS-RDI (Reuse Segment Remote Defect Indication)
  • the present invention will use the reserved bytes therein to negotiate the phase modes (decision mode) indicating both ends, and perform corresponding decisions according to the matching conditions.
  • the method of the present invention is applied to the multiplex section protection (MSP) of the access side in a packet transport network (PTN) device to improve the protection switching efficiency.
  • MSP multiplex section protection
  • PTN packet transport network
  • FIG. 2 A schematic diagram of a node device according to an embodiment of the present invention is shown in FIG. 2.
  • the invention is defined in the multiplex section overhead K2 byte b6-b8, and the definition is as follows:
  • the bidirectional protection group includes STM ports #A-1 and #B-1 of line cards A and B, where #A-1 is the working port, # B- 1 is a protection port.
  • the 1:N bidirectional protection group includes N working ports and 1 protection port. 1 : N can only protect one working channel at the same time, and N working channels share one protection channel. Therefore, protection is generally determined according to priority. Which work channel is the business.
  • Line card A detects the alarm information of port #A-1, line card B detection #B-1 port alarm information and the received Kl, K2 bytes, which are sent to the APS decision module of the main control board through the inter-board communication module.
  • the APS decision module also receives the switching control command issued by the network management device to the protection group of the local device, and the user can set the multiplexing segment 1: the two-way decision mode.
  • the user can indicate whether the decision mode of the protection group uses 1-phase or 3-phase, so that the end device is b6-b8 in the K2 byte sent by the protection group. The corresponding value will be filled in.
  • FIG. 3 is a flowchart of a method for implementing bidirectional linear protection switching of a multiplex section according to an embodiment of the present invention. As shown in FIG. 3, the method includes the following steps:
  • the node device searches for the configured multiplex section protection group identifier (ID) according to the alarm information or the port that receives the K byte or the switching control, and the node device receives the alarm information and the switching control information, and then sends the APS module to the APS module. Initiating a local bridging request may also directly input this information to the APS module, which is handled by the cost bridging request.
  • ID configured multiplex section protection group identifier
  • S20 The local device compares the local request and/or the remote request in the protection group, and calculates the maximum request with the highest priority in the protection group and the service number of the request; and extracts the request of the peer from the signaling sent by the peer end.
  • the local maximum request is the highest priority bridging request among the bridging requests for all working and protection channels in the local protection group.
  • the local maximum request is calculated when the bridge request of a local channel changes (that is, the alarm information of each channel in the local protection group and the priority comparison of the switching control information are generated), and the remote request receives the opposite end.
  • the signal is extracted from the multiplex section. For details, see G.8131.
  • the request with the highest priority is used to ensure that the two ends perform the same bridge switching on the channel where the request is located.
  • the request is reported to the opposite end by requesting corresponding signaling (such as SD, SF, etc.); if it is a remote request, the transmitted signaling is RR (reverse request, indicating that it is an acknowledgement Request).
  • corresponding signaling such as SD, SF, etc.
  • S30 Perform bridging switching according to the received decision mode indicated by K2. Determine the received information of K2, that is, b6-b8, and extract the decision mode information of the peer end from K2. If b6-b8 of receiving K2 is 011, Save the decision mode (mode) to 3-phase, execute the decision according to the standard 3-phase (omitted), and send b2-b8 of K2 to fill in 011, indicating 3-phase, ending;
  • the NMS sets the multiplex section 1:N bidirectional decision mode to 1 -phase
  • the node device APS decision module
  • the report decision mode does not match the information to
  • the network management device is a kind of prompt for the customer, similar to the alarm prompt, and ends.
  • the K2 indication 1-phase is received, the save execution mode mode is 1-phase, and the process proceeds to step S40. If the receiving K2 indicates other values, the situation of the local setting is judged. If the device is 3-phase, the decision is made according to the standard 3-phase (omitted), otherwise the process proceeds to step S40.
  • S40 Perform bridging and switching of the service number indicated by the request with the highest priority. If the maximum request is a remote request, go to S50; otherwise, the content of the sending protocol byte is: the request type is the maximum request, the request service number and the bridged service number are both the service number indicated by the maximum request, and b6-b8 indicates 1 in K2. -phase, end;
  • the content of the sending protocol byte is: the request type is RR (reverse request), the request service number and the bridged service number are both service numbers indicated by the maximum request, and b6-b8 indicates 1-phase in K2.
  • the management plane sets the multiplex section 1:N bidirectional decision mode to 3-phase, if the node determines that the decision mode set by the network management is different from the local storage decision mode, the report decision mode does not match the information to the network management device, and is for the customer.
  • a hint similar to an alert, ends.
  • the result of the bridge switching decision is transmitted to the line card A and the line card B through the inter-board communication module, and the transmission K1 and ⁇ 2 are transmitted to the line card and transmitted through the protection port.
  • the introduction of this method can effectively compensate for the following problems on the switching time: 1.
  • the transmission efficiency of the inter-board communication module is low; 2.
  • the decision-making execution efficiency of the APS decision-making module on the main control is low; 3.
  • the execution efficiency of the line card execution action is low.
  • the service switching time is related to the above several. When the number of interactions is reduced, the requirements for other parts can be appropriately reduced.
  • FIG. 4 is a schematic diagram of the APS message flow of the multiplex section bidirectional linear protection switching 1-phase according to the present invention.
  • the protection switching process is as follows: Initially, both ends of the node device send signaling of NR0, 0; when the left-end node device detects that signal 2 is degraded, and calculates the highest priority of the SD bridging request of signal 2, After the bridge switching is completed, SD2, 2 is sent (requesting the peer bridge signal 2); if the right end node device has the highest priority of the bridge request for the acknowledgement signal 2, the bridge switching of the signal 2 is also completed, and RR2, 2 is sent.
  • the latter process is similar.
  • FIG. 5 is a schematic flow chart of an APS message of a 1-phase node device and a 3-phase node device of the present invention, assuming that the left end node device is set to 1-phase, and the right end node device is set to an existing node device (existing node)
  • the devices are executed in 3-phase, and the phase is not detected from K2.
  • the protection switching process is as follows: Initially, both ends send NR0, 0 signaling; when the left end node device (press 1-phase, because When the received K2 byte has no indication mode, it is still executed by 1-phase.
  • the signal 2 degradation (SD) is detected, and the SD bridge request of the signal 2 is calculated to have the highest priority, the bridge switching is completed, so SD2, 2 is transmitted.
  • SD signal 2 degradation
  • the right end node device detects signal 3 failure (SF) and calculates the SF bridge of signal 3, please If the priority is the highest, the signal 2 is reversed and the SF3, 2 is sent; the left end device undoes the bridge switching of the signal 2, and completes the bridge switching of the signal 3, transmitting RR3, 3; the right end node device completes the bridge switching of the signal 3. , send SF3, 3; the latter process is similar.
  • SF failure
  • the device of the present invention is well compatible with the original device, and there is no problem of docking. The entire process is degraded to two handshakes to complete the bridge switching, so there is no impact on the switching efficiency.
  • the 3-phase side refers to the node in which the present invention is implemented in a default 3-phase manner, and the 1-phase side finger is executed in a 1-phase manner using the node of the present invention as shown in FIG. 5, when requested by the 3-phase side
  • the entire process degenerates into a 2-phase (two-node interaction between two nodes) execution, and if the request is initiated by the 1-phase side, it is still executed in 1-phase.
  • B clicks 3-phase to execute when NR is received instead of RR, it will cause point B to fail to complete the switchover (NR request was originally only used to indicate that there is no request currently, request signal number is 0 or additional service number) .
  • the present invention provides a method and a node device for realizing bidirectional linear protection switching of a multiplex section, and reduces the three interactions of protocol bytes in the switching process to one interaction, and the corresponding decision processing is only once, which can greatly improve
  • the multiplexing efficiency of the multiplex section 1:N bidirectional linear protection compensates for the deficiencies of other processing units.
  • the implementation of the multiplex section protection decision is optimized, and the requirements for other processing units are correspondingly reduced. For example, after the switching efficiency is increased, the requirements for fast detection of alarms can be reduced accordingly.
  • the alarms are quickly detected by hardware, which can relatively reduce some parameters of the hardware.
  • the announcement phase mode also enhances controllability.

Abstract

La présente invention concerne un procédé permettant de réaliser une commutation de protection linéaire bidirectionnelle pour une section de multiplexage. Le procédé se déroule comme suit : après qu'un dispositif de nœud a calculé la demande de pontage avec la priorité la plus haute dans un groupe de protection, il effectue le pontage de la commutation pour le service correspondant à la demande de pontage, selon un premier mode de décision. La présente invention concerne également le dispositif de nœud comportant au moins un port de travail et un port de protection qui interagissent avec un module de commutation de protection automatique (APS). Le module APS est conçu pour : effectuer un pontage et une commutation pour le service correspondant à une demande de pontage, selon le premier mode de décision, après le calcul de la demande de pontage avec la priorité la plus haute dans un groupe de protection. La présente invention peut grandement améliorer l'efficacité de la commutation de la protection linéaire 1/N bidirectionnelle pour une section de multiplexage.
PCT/CN2010/079521 2010-09-26 2010-12-07 Procédé et dispositif de noeud pour la réalisation d'une commutation de protection linéaire bidirectionnelle pour une section de multiplexage WO2012037754A1 (fr)

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CN201010294424.5A CN101951303B (zh) 2010-09-26 2010-09-26 一种实现复用段双向线性保护倒换的方法及节点设备
CN201010294424.5 2010-09-26

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CN102882590A (zh) * 2011-07-15 2013-01-16 中兴通讯股份有限公司 一种双向工作路径故障消失后的处理方法及装置、系统
CN102801611B (zh) * 2012-07-05 2018-11-16 南京中兴新软件有限责任公司 一种实现跨线卡msp的方法、主控芯片和ptn设备
CN102868441B (zh) * 2012-08-22 2017-03-22 中兴通讯股份有限公司 一种保护倒换方法、系统及光网络节点
US9806939B2 (en) 2013-10-17 2017-10-31 Electronics And Telecommunications Research Institute Method and apparatus for linear protection switching
KR20150044801A (ko) * 2013-10-17 2015-04-27 한국전자통신연구원 선형 보호 절체 방법 및 장치

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US5692034A (en) * 1990-10-01 1997-11-25 United States Advanced Network, Inc. Customized, billing-controlled call bridging system
CN1617476A (zh) * 2003-11-12 2005-05-18 阿尔卡特公司 用于sdh/sonet网络的路径/通道保护
CN101001123A (zh) * 2006-12-31 2007-07-18 华为技术有限公司 用于光传输网络的倒换方法和装置
CN101702658A (zh) * 2009-11-24 2010-05-05 中兴通讯股份有限公司 一种环网保护的实现方法及系统

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US5692034A (en) * 1990-10-01 1997-11-25 United States Advanced Network, Inc. Customized, billing-controlled call bridging system
CN1617476A (zh) * 2003-11-12 2005-05-18 阿尔卡特公司 用于sdh/sonet网络的路径/通道保护
CN101001123A (zh) * 2006-12-31 2007-07-18 华为技术有限公司 用于光传输网络的倒换方法和装置
CN101702658A (zh) * 2009-11-24 2010-05-05 中兴通讯股份有限公司 一种环网保护的实现方法及系统

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