WO2009036676A1 - Procédé de transition d'état et équipement de nœud de réseau - Google Patents

Procédé de transition d'état et équipement de nœud de réseau Download PDF

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Publication number
WO2009036676A1
WO2009036676A1 PCT/CN2008/071948 CN2008071948W WO2009036676A1 WO 2009036676 A1 WO2009036676 A1 WO 2009036676A1 CN 2008071948 W CN2008071948 W CN 2008071948W WO 2009036676 A1 WO2009036676 A1 WO 2009036676A1
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WO
WIPO (PCT)
Prior art keywords
state
protection lock
protection
clear
status
Prior art date
Application number
PCT/CN2008/071948
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English (en)
Chinese (zh)
Inventor
Changgong Yang
Haichun Fu
Mingyan Liu
Wenhua Sun
Wenguang Xu
Original Assignee
Huawei Technologies Co., Ltd.
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
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009036676A1 publication Critical patent/WO2009036676A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability

Definitions

  • the present invention relates to the field of communications, and in particular, to a method for performing state transition in automatic protection switching (APS) in end-to-end communication and a corresponding network node device.
  • APS automatic protection switching
  • the APS automatic protection switching mechanism is a point-to-point switching mechanism between different ends of an Ethernet (ETH)-based virtual local area network (VLAN) defined on the basis of the ITU-T G.8031/Y1342 protocol.
  • ETH Ethernet
  • VLAN virtual local area network
  • Figure 1 a typical end-to-end communication model, in which the local and remote ends use two physical transmission links, the working link and the standby link, between the two endpoints to transmit services.
  • the terminal and the remote end periodically receive maintenance commands and issue various alarm information according to the standard.
  • the existing APS automatic protection switching protocol defines the following two protection mechanisms:
  • the local end copies the service into two parts, and transmits to the remote end through the working link and the standby link, and the remote end selects a link for service reception.
  • 1:1 protection mechanism There is a working link and a standby link between the local end and the remote end.
  • the local end sends service signals to the remote end through the working link.
  • the working link fails, such as the transmission link. If the failure or the transmission quality is degraded, the link switching can be performed, and the service signal is continuously sent through the standby link.
  • the remote link synchronizes the switching between the working link and the standby link.
  • Table 1 below is the request command and status change table received by the local end: Table 1
  • the jump status maintained by the local end includes: A state, B state, C state, D state, E state, F state, G state, H state, and I state.
  • each state it specifies whether the service signal is transmitted on the working link or on the standby link, such as "Working Link Active, Protection/Standby", indicating that In the state, the service signal is transmitted on the working link, and the standby link is in a waiting or ready state; otherwise, "Working link waiting, standby/protection (Active/Active), indicating that the state is in the state
  • the service signal is transmitted on the standby link, and the working link is in a waiting or ready state.
  • Forced switching to the standby link Forced switching to the standby link (Force Switch, FS);
  • the cells in the state change table list the state transitions after receiving the request command in various jump states. For example, "the symbol indicates that the local end switches to the A state after receiving the corresponding request command. That is, there is no switching request status.
  • the APS information packet is sent to the remote end to notify the remote end of the switching.
  • Table 2 below shows the request command and status change table received by the remote end.
  • Waiting 1 ⁇ , 1, m, n, o, p, q, r, s in Table 2 is the request command received by the far end.
  • A, B, C, D, E, F, G, H, and I are the jump states to be maintained by the remote end.
  • the meaning of each status and request command is the same as in Table 1.
  • the remote end determines that the current protection switching needs to be switched to the working link or the standby link through the indication value included in the received APS signaling.
  • the inventor has found that the automatic protection switching between the local end and the remote end has the following problems: When the local end is in the protection locked state, if the working link is faulty, link switching needs to be performed, that is, switching to the standby link continues. Transmit business signals.
  • the local end can perform the clear command (Clear) in Table 1, perform state transition, and send an automatic protection switching request to the remote end.
  • the remote end When the remote end is also in the protection lock state, it can be known from the "C protection lock" state in Table 2 that the protection lock state is a high priority state, and no state transition is performed on any command received, that is, the remote end is in protection.
  • the input is interrupted.
  • the embodiment of the invention provides a state transition method and a network node device, which is implemented to notify the remote end of the local protection lock state, so that both ends can release the protection lock together, so that After the link is faulty, the remote end can respond to the automatic protection switching request sent by the local end.
  • a state transition method is applied to the state transition between the local end and the remote end of two network nodes with automatic protection switching, including:
  • the local end clears the protection lock status and sends a clear protection lock command or notification to the remote end.
  • a state transition method is applied to the state transition between the local end and the remote end of two network nodes with automatic protection switching, including:
  • the local end receives the clear protection lock command or notification sent by the remote end. If the current state is the protection lock state, it is converted to the no-switch request status.
  • a network node device includes: a transmitting/receiving unit, a state switching unit, and a protection locking state clearing unit; wherein:
  • the transmitting/receiving unit is configured to send/receive a service signal and send/receive an automatic protection switching related command; and control the state transition unit to perform state transition according to the sent/received automatic protection switching command;
  • the state transition unit is configured to accept control of the sending/receiving unit to perform a state transition;
  • the protection lock state clearing unit is configured to clear a protection lock state, and instruct the sending/receiving unit to establish a working link Another network node device connected to the alternate link sends a clear protection lock command or notification;
  • the state transition method and the network node device send a clear protection lock notification or a command to the remote end after the local end clears the protection lock state; if the current state of the remote end is the protection lock state, the state is converted to a non-switching request state, so that both ends The protection lock can be released together.
  • the remote end can respond to the automatic protection switching request sent by the local end in time to synchronize the link switching, thus ensuring uninterrupted transmission of service signals.
  • 1 is a schematic diagram of an end-to-end communication model in the prior art
  • 2 is a schematic diagram of the automatic protection switching request that does not respond to the local end when the remote end is in the protection locked state
  • FIG. 3 is a flowchart of a process after a remote end receives a clear protection lock notification message sent by the local end according to an embodiment of the present disclosure
  • FIG. 4 is a flowchart of a process after a remote end receives a clear remote protection lock command issued by the local end according to an embodiment of the present disclosure
  • FIG. 5 is a schematic structural diagram of a network node device according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of a protection lock state clearing unit in FIG. 5;
  • FIG. 7 is a second schematic structural diagram of the protection lock state clearing unit in FIG. 5.
  • the two network nodes with the automatic protection switching function are distinguished, and the end that sends the clear protection lock notification or command is called the local end, and The end that receives the clear protection lock notification or command is called the far end.
  • the local and remote ends are interchangeable.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the local end works normally and is in the protection lock state. After the clear command (Clear) is executed, it returns to the no-replacement request state, and then sends a clear protection lock notification message to the remote end to notify the remote end to clear the protection lock status, so that the subsequent chain If the path is faulty, the remote end can respond to the automatic protection switching request sent by the local end.
  • the notification message can also be sent at the same time as the execution of the clear command, or it can be sent in advance, without strict time relationship.
  • Step 301 The remote end determines whether the state of the user is in the protection lock state; if the protection is locked, step 302 is performed or step 303 is performed. If the current state of the remote end is not the protection locked state, then go to step 304;
  • Step 302 The remote end automatically executes a clear command to clear its own protection lock status.
  • Step 303 Send an alarm to request to clear the protection lock status.
  • Step 304 no operation is performed.
  • a specific processing policy in which the remote end receives the clear protection lock notification message can be set in advance. If the set processing policy is to automatically execute the clear command, when the remote end receives the clear protection lock notification message sent by the local end, and the current state is the locked state, the above step 302 is performed. If the set processing policy is to send an alarm, when the remote end receives the clear protection lock notification message sent by the local end, and the current state is the locked state, the above step 303 is performed.
  • the local end clears the protection locking state, which specifically includes:
  • the local end After the local end detects that the protection lock state has reached the set threshold, it automatically executes the clear command to clear the protection lock state of the local end and converts it to the non-switching request state. Otherwise, the local end determines the self after receiving the cleared command. When the current state is the protection lock state, the protection lock state is cleared and the status is changed to no switch request status.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • Table 3 compares with Table 2, adding a receive command, that is, adding the clear remote protection lock command c
  • Table 3 compares with Table 2, adding a receive command, that is, adding the clear remote protection lock command c
  • Step 401 The remote end determines whether it is in a protection locked state. If it is determined that the protection is not in the protection lock state, go to step 403; if the current state is the protection lock state, go to step 402; Step 402, further determine whether the remote end is configured to automatically respond to clear the remote protection lock command; In response to the clear remote protection lock command, step 403 is performed; otherwise, step 404 is performed;
  • Step 403 The remote end automatically clears the self-protection lock state, and switches to the no-switching request state.
  • Step 404 The remote state does not change, and an alarm is issued to request to clear the protection lock state.
  • Step 405 The remote end receives the operation and maintenance personnel to initiate After the clear command, step 403 is executed, that is, the state is changed to the no-switching request state.
  • Step 406 The remote end responds to the automatic protection switching request of the local end, and switches to the corresponding link, and completes the automatic protection switching of the link in synchronization with the local end.
  • the present invention further provides an embodiment of a network node device structure.
  • the network node device includes:
  • a transmitting/receiving unit 501 configured to transmit/receive a service signal and transmit/receive an automatic protection switching; and control the state transition unit 502 to perform a state transition according to the automatic protection switching command sent/received;
  • the state transition unit 502 is configured to accept the control of the transmitting/receiving unit 501 to perform a state transition.
  • the protection lock state clearing unit 503 is configured to clear the protection lock state, and after clearing the protection lock state, instruct the sending/receiving unit 501 to establish Another network node device that is connected to the working link and the standby link sends a clear protection lock notification message, or sends a clear remote protection lock command; and receives a clear protection lock notification message sent by another network node device or clears the far After the end protection lock command is issued, when it is determined that the current state is the protection lock state, the notification state transition unit 502 transitions to the no-switch request status.
  • FIG. 6 is a schematic diagram of a specific structure of the protection lock state clearing unit 503 of FIG. 5.
  • the protection lock state clearing unit 503 further includes: a first clearing subunit 601, an indicating subunit 602, a parsing subunit 603, and a second clearing Subunit 604; where:
  • the first clearing sub-unit 601 is configured to automatically execute the clear command after the protection lock state is maintained to reach the set threshold, and clear the protection lock state of the local end, and instruct the state transition unit 502 to switch to the no-switch request status; After receiving the issued clear command, the state transition unit 502 obtains its current state, and when its current state is the protection lock state, clears the protection lock state, and instructs the state transition unit 502 to transition to the no-switch request state;
  • the first clearing subunit 601 notifies the indicating subunit after clearing the protection locking state of the local end. 602;
  • the indication subunit 602 is configured to receive the notification sent by the first clearing subunit 601, and instruct the sending/receiving unit 501 to send a clear protection lock notification message to another network node device that establishes the working link and the standby link connection, or Send clear remote protection lock command;
  • the parsing subunit 603 is configured to receive and parse the protection lock notification message, or receive and parse the clear remote protection lock command, and send the parsing result to the second clearing subunit 604;
  • the second clearing subunit 604 is configured to receive the parsing result sent by the parsing subunit 603, obtain the current state of the self from the state converting unit 502, and clear the protection locking state when the current state of the self is the protection locking state, indicating the state transition.
  • the unit is converted to a no-replacement request state or an alarm is issued, requesting to clear the protection lock status.
  • the protection lock status clearing unit 503 may further include a response policy storage subunit; as shown in FIG. 7, the response policy storage subunit 605 stores a first response policy for clearing the protection lock, or a second response for issuing an alarm.
  • the second clearing subunit 604 receives the parsing result, and obtains its own current state as the protection lock state, the query response policy storage subunit 605;
  • the protection lock status is cleared, indicating that the state transition unit 502 is converted to the no-switch request status; or according to the acquired second response policy, an alarm is issued to request to clear the protection lock status.
  • the state transition method and the network node device provided by the embodiment of the present invention are configured to clear the remote protection lock state by sending the remote protection lock notification message or the remote protection lock command to the remote end, and respond to the local protection switching request. purpose.
  • the defect and the problem that the remote end cannot automatically respond to the protection switching request of the local end when the local end and the remote end are in the protection locked state are solved in the prior art.
  • the storage medium may be a magnetic disk, an optical disk, or a read-only storage memory (Read-Only) Memory, ROM) or Random Access Memory (RAM).
  • Read-Only Read-Only Memory
  • RAM Random Access Memory

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

Abstract

L'invention concerne un procédé de transition d'état et un équipement de nœud de réseau. Le procédé et l'équipement sont appliqués à la transition d'état des nœuds du réseau à l'extrémité proche et à l'extrémité distante. Les nœuds du réseau possèdent une fonction de commutation automatique de protection dans le cadre de la communication de bout en bout. Concrètement, la notification pour supprimer le verrouillage de la protection ou la commande de la demande pour supprimer le verrouillage de la protection sur l'extrémité distante est envoyée à l'extrémité distante, faisant en sorte que l'extrémité distante soit convertie àla demande de non-commutation. Lorsqu'une panne de réseau survient dans l'extrémité proche, l'extrémité distante peut répondre automatiquement à la demande de commutation de la protection par l'extrémité proche. Le procédé et l'équipement résolvent le problème suivant. Si l'extrémité distante est dans l'état de verrouillage de la protection en ayant une haute priorité, elle ne peut pas répondre automatiquement à la demande de commutation automatique de protection, ce qui fait que la commutation automatique de protection sur l'extrémité proche et sur l'extrémité distante n'est pas en phase et cela a pour conséquence d'interrompre la transmission des signaux.
PCT/CN2008/071948 2007-09-17 2008-08-11 Procédé de transition d'état et équipement de nœud de réseau WO2009036676A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2007101546342A CN101394261B (zh) 2007-09-17 2007-09-17 一种状态转换方法与网络节点装置
CN200710154634.2 2007-09-17

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JP5530520B2 (ja) * 2009-08-17 2014-06-25 アルカテル−ルーセント イーサネット（登録商標）リニアプロテクション切替の状態遷移のための方法および手段
CN102611604B (zh) * 2011-01-19 2019-01-15 中兴通讯股份有限公司 一种共享网状保护实现方法及系统
CN102355408A (zh) * 2011-08-16 2012-02-15 杭州华三通信技术有限公司 一种通信设备的链路状态变更控制方法和装置
CN103580932A (zh) * 2013-11-26 2014-02-12 盛科网络（苏州）有限公司 基于以太网线性保护倒换的状态切换方法及系统
CN104836729B (zh) * 2015-05-19 2018-09-11 瑞斯康达科技发展股份有限公司 一种线性保护倒换的方法、pe设备及系统
CN104935507B (zh) * 2015-06-03 2018-05-08 瑞斯康达科技发展股份有限公司 一种线性保护倒换的方法、pe设备及系统

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CN101394261B (zh) 2012-02-15
CN101394261A (zh) 2009-03-25

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