WO2004114594A1 - Procede de reprise en secours du service d'un dispositif dans un reseau de groupe atm (mode de transfert asynchrone) - Google Patents

Procede de reprise en secours du service d'un dispositif dans un reseau de groupe atm (mode de transfert asynchrone) Download PDF

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Publication number
WO2004114594A1
WO2004114594A1 PCT/CN2004/000159 CN2004000159W WO2004114594A1 WO 2004114594 A1 WO2004114594 A1 WO 2004114594A1 CN 2004000159 W CN2004000159 W CN 2004000159W WO 2004114594 A1 WO2004114594 A1 WO 2004114594A1
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WO
WIPO (PCT)
Prior art keywords
atm
connection
virtual
virtual channel
endpoint
Prior art date
Application number
PCT/CN2004/000159
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English (en)
Chinese (zh)
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WO2004114594A8 (fr
Inventor
Shanfeng Ke
Ke Li
Xifeng Wan
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2004114594A1 publication Critical patent/WO2004114594A1/fr
Publication of WO2004114594A8 publication Critical patent/WO2004114594A8/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5625—Operations, administration and maintenance [OAM]
    • H04L2012/5627—Fault tolerance and recovery

Definitions

  • the present invention relates to a method for distributing services in an asynchronous transmission mode (ATM) device network, and in particular, to a method for implementing service backup by using ATM multicast function and quickly detecting a failure of a service channel.
  • ATM asynchronous transmission mode
  • ATM Asynchronous Transfer Mode
  • ATM cells need bandwidth only when there is data transmission, but can provide time slots equivalent to time division multiplexers for continuous transmission.
  • Each ATM connection is identified by a label in the cell header.
  • the labels include a virtual channel identifier (Virtual Channel Identifier (hereinafter referred to as VCI)) and a virtual path identifier (Virtual Path Identifier (hereinafter referred to as VPI))
  • VCI P a virtual channel (Virtual Channel (hereinafter referred to as VC))
  • VC Virtual Channel
  • VP virtual path
  • ATM technology plays an extremely important role and is widely used in access, aggregation, and core switching equipment. All ATM technology-based devices are hereinafter referred to as ATM switching equipment.
  • ATM equipment generally supports a variety of interfaces, such as El, E3, STM-1, STM-4, and so on. ATM equipment interconnects through these interfaces to realize an ad hoc network, thereby carrying various services such as video, voice, data, and Internet access.
  • the main control unit and switching network board of the ATM equipment generally need to adopt the Chinese backup design to ensure that when one of the paths carrying services fails, the other one is replaced.
  • An existing service backup method is to implement service protection or interface backup through route switching. Specifically, in this method, it is implemented between the upper and lower ATM devices.
  • the ATM Forum and related ITU-T protocols (such as PNNI1.1 and IISP) manage the link status between ATM devices, support dynamic routing protocols, and assign addresses to all ATM users to support dynamic calling protocols between users. .
  • the source initiates a call to dynamically apply for a virtual connection, and the system selects a normal interface and sends a virtual connection request to the destination device based on the current routing information. Therefore, after negotiation between the two ATM devices, End-to-end connections can be established between them similar to ordinary ATM interfaces. When the interface fails, the routing status will change. The system releases the current virtual connection between the two ATM devices and re-establishes a new connection between them based on the new routing information.
  • the disadvantage of the above method is that all the devices participating in the networking need to support the relevant protocols of the ATM Forum or ITU-T, resulting in a complicated implementation method.
  • DSLAM digital subscriber line access mode
  • the SVC / SPVC software protocol provides support, so this method is not suitable for DSLAM.
  • the switching time is long and cannot meet the switching requirements of some bearer services. For example, in the V5 voice service, failures such as call disconnection may occur.
  • another service backup method mainly depends on the design of the hardware. It provides a backup interface board for each interface board. Under normal circumstances, data is transmitted and received only on the interface of the active interface board.
  • the backup interface The board does not process data.
  • the main interface board fails or the interface on the main interface board fails, the main board stops processing data and sets it as the standby board, and the previous standby board is upgraded to the main board to start sending and receiving data.
  • the above method requires special design of the hardware, which leads to an increase in cost, and it is difficult to support both the active and standby interfaces and the active and standby boards at the same time, and is not conducive to the upgrade of the built-in network switching function.
  • this method can only handle the switching guarantee when the interface between two levels of ATM equipment fails. In a multi-level ATM equipment network, protection switching cannot be performed for the failure of intermediate links and nodes.
  • Another interface backup method is to abandon the self-organizing network function between ATM devices. 04 000159
  • the object of the present invention is to provide a service backup method in an asynchronous transfer mode (ATM) device networking, which has the advantages of simple implementation but strong protection function.
  • ATM asynchronous transfer mode
  • a service backup method in an asynchronous transfer mode (ATM) networking system implements service backup by providing a redundant virtual channel connection for a virtual channel connection carrying a service, wherein the system establishes a Permanent virtual connections from source endpoints to several destination endpoints:
  • Each destination endpoint is set as a leaf node of the root node of the multicast connection.
  • the source endpoint and the destination endpoint are connected to a cell bus to complete the exchange of ATM cells in a bus manner.
  • the source endpoint and the destination endpoint are connected to a centralized ATM switching network to complete the exchange of ATM cells through it.
  • a service backup method in an asynchronous transfer mode (ATM) networking system implements service backup by providing redundant virtual channel connections for virtual channel connections that carry services, wherein the system establishes Permanent virtual connections from source endpoints to several destination endpoints:
  • One of the multicast connections is set as the active connection in the active state, and the remaining multicast connection is set as the standby connection in the inactive state,
  • the source endpoint and the destination endpoint are connected to a cell bus to complete the exchange of ATM cells in a bus manner.
  • the source endpoint and the destination endpoint are connected to a centralized switching network to complete the exchange of ATM cells through it.
  • a service backup method in an asynchronous transfer mode (ATM) networking system implements service backup by providing redundant virtual channel connections for virtual channel connections that carry services, wherein the system establishes A permanent virtual connection from a source endpoint to a destination endpoint:
  • ATM asynchronous transfer mode
  • each unidirectional unicast connection has the same virtual path identifier (VPI) / virtual channel identifier (VCI) and traffic parameters; one of them is unidirectional Unicast connections are set as the active connection in the active state, and the remaining unidirectional unicast connections are set as the standby connection in the inactive state.
  • VPN virtual path identifier
  • VCI virtual channel identifier
  • the system changes the status of the permanent virtual connection in the following manner: If the current primary connection is unavailable, it is achieved by setting it to an inactive state and setting one of the remaining unidirectional unicast connections to the active state Switching of the active connection.
  • the source endpoint and the destination endpoint are connected to a cell bus to complete the exchange of ATM cells in a bus manner.
  • the source endpoint and the destination endpoint are connected to a centralized switching network to complete the exchange of ATM cells through it.
  • the virtual connection carrying the main connection service is connected according to the physical layer alarm reported by the ATM interface.
  • the virtual connection of the virtual channel is to determine whether the virtual connection carrying the main connection service is connected according to the OAM layer alarm reported by the virtual channel.
  • the ATM networking system can provide redundant virtual channels for bearer services by properly configuring a multicast connection or a unidirectional unicast connection. Connect for business backup.
  • Fig. 1 is a schematic diagram of an embodiment of the method according to the present invention.
  • Fig. 2 is a schematic view of another embodiment of the method according to the present invention.
  • the core idea of the method of the present invention is to implement service backup by providing redundant virtual channel connections for bearer services, which will be further explained below.
  • a service is carried by a permanent virtual connection from a source endpoint to a destination endpoint, in order to provide service backup capability to the destination endpoint, according to the present invention, in addition to the destination endpoint, multiple destination endpoints can be added and A virtual channel connection carrying the service is established between the source endpoint and each additional destination endpoint.
  • the multicast function of the ATM technology can establish a starting point-multipoint virtual channel connection, so it can be used to implement the above service backup capability. That is, the source endpoint is first set as the root node of the multicast connection, and then each destination endpoint is set. A leaf node of a root node for the multicast connection.
  • a service is a multicast service itself, that is, the source endpoint serves as the root node to transmit services to multiple destination endpoints as its leaf nodes.
  • the source endpoint serves as the root node to transmit services to multiple destination endpoints as its leaf nodes.
  • the source endpoint serves as the root node to transmit services to multiple destination endpoints as its leaf nodes.
  • the source endpoint in addition to the Multiple source endpoints can be added in addition to the source endpoint, and each source endpoint is set as the root node of a multicast connection, each destination endpoint is set as the leaf node of each multicast connection root node, and all multicast Connections have the same Virtual Path Identifier (VPI) / Virtual Channel Identifier (VCI) configuration and traffic parameter configuration.
  • VPN Virtual Path Identifier
  • VCI Virtual Channel Identifier
  • one of the multicast connections should be set as the active connection in the active state, and the rest should be set as the standby connection in the inactive state. If the current active connection is unavailable, the active connection is switched by setting it to the inactive state and setting one of the remaining multicast connections to the active state.
  • the virtual connection bearer in order to provide service backup capability to the source endpoint, according to the present invention, in addition to the source endpoint, multiple source endpoints can be added, and a unidirectional unicast connection from each source endpoint to the destination endpoint is established.
  • a unicast connection has the same virtual path identifier (VPI) / virtual channel identifier (VCI) and traffic parameters.
  • VPN virtual path identifier
  • VCI virtual channel identifier
  • traffic parameters In order to ensure that only one unicast unidirectional connection is transmitting services at any time, one of the unidirectional unicast connections should be set as the active primary connection, and the remaining unidirectional unicast connections should be set as inactive. Backup connection. If the current active connection is unavailable, the active connection is switched by setting it to the inactive state and setting one of the remaining unidirectional unicast connections to the active state.
  • the above situations 1 to 3 are the basic connection types.
  • the service backup of other connection types can be realized by combining the above methods.
  • the method of case 1 can be used to implement service backup of a point-to-multipoint virtual connection
  • the method of case 3 can be used to implement service backup of a multipoint-to-point virtual connection.
  • the following describes two preferred embodiments for implementing protection switching of a bidirectional unicast connection by using the embodiments.
  • the first embodiment is used for an ATM device of a bus-type switching structure, and the second embodiment is used for centralized switching. ATM equipment of the type structure.
  • First embodiment is used for an ATM device of a bus-type switching structure, and the second embodiment is used for centralized switching. ATM equipment of the type structure.
  • a bus-type switching structure as shown in FIG. 1 is generally used for connection.
  • three interface boards A, B, and C implement ATM cell exchange based on the bus-type switching structure.
  • the interface board B and the interface board C provide uplink interfaces and are respectively connected to the first device and the second device, that is, they are connected to the upper-layer network through the two uplink interfaces.
  • a multicast connection root with interface board A as the root node and interface board B as the leaf node is first established, and then A leaf is added to the interface board C on this connection, that is, the interface board C is also set as a leaf node of the multicast connection.
  • a leaf is added to the interface board C on this connection, that is, the interface board C is also set as a leaf node of the multicast connection.
  • interface board B and interface board C In the direction to interface board A, establish a unidirectional unicast connection from interface board B to interface board A and from interface board C to interface board A, respectively.
  • These two connections use the same VPI / VCI and have the same flow parameters.
  • only one of the two connections should be activated. For example, it is assumed here that a unicast connection from interface board B to interface board A is activated.
  • the data connected to interface board A is sent to the connections on interface boards B and C at the same time, but interface board A only sends from interface board B Receiving data, thereby achieving data transmission with the uplink device through the "dual transmission selective reception" mode.
  • the multicast connection from interface board A to interface board B and interface board C does not change. You only need to control interface board B and The state of the two unidirectional unicast connections from interface board C to interface board A is sufficient. Specifically, deactivate the unicast connection from interface board B to interface board A and activate the unicast connection from interface board C to interface board A.
  • the system needs to know the fault conditions of each virtual connection in time. Therefore, it is necessary to support the physical layer alarm and the operation and management (OAM) alarm capability between the device and the upper-level device, according to the OAM on the interface link and the connection. Alarms switch unicast connections in a timely manner.
  • OAM operation and management
  • related protection protocols such as 1.610 and 1.630 can also be used to detect RLOS / ROF / SD alarms at the physical layer, AIS / RDI alarms at the ATM layer, interfaces on the device, and board failure alarms to initiate service protection switching.
  • the centralized switching structure shown in Figure 2 is generally used for connection.
  • the three ATM business processing units are respectively connected to the interface boards A and B.
  • C and the switching network board access the switching network to realize the exchange of ATM cells, and the interface boards B and C provide working ports and protection ports respectively.
  • the specific implementation method can also adopt the configuration of a two-leaf multicast connection + two unidirectional unicast connections, which will be further described below.
  • the data connected to interface board A is sent to the connections on interface boards B and C at the same time, but interface board A only receives data from interface board B, thus implementing the mode of "dual transmission and selective reception".
  • the reliable transmission of data When switching is required (for example, when the connection of interface board B is abnormal or data cannot be received), the multicast connection from interface board A to interface boards B and C does not change. You only need to control interface board B and interface board The state of the two unidirectional unicast connections from C to interface board A is sufficient. Specifically, the unicast connection from interface board B to interface board A is deactivated and the unicast connection from interface board C to interface board A is activated.
  • the second embodiment should also support the physical layer alarm and the operation and management (OAM) alarm capability between the device and the superior device to switch the order in time according to the OAM alarm on the interface link and connection Broadcast connection. And to save system resources, the same 004 000159
  • the method of the present invention can be used to implement service backup of a bidirectional unicast connection, and the difference lies only in the multicast replication structure.
  • the same is true for service backups of other connection types, and therefore will not be described again.
  • the method of the present invention can realize the protection switching of the interface without any special design of the interface hardware of the ATM device.
  • the ATM device supports the multicast feature, it can be used in a wide range and has a wide range of supported interface types. Supports various interfaces such as E1 / T1, E3 / T3, STM-1 / STM-4, etc.), with strong portability and low cost.
  • the method of the present invention can not only realize board-level and interface-level protection switching, but also can implement VP-level protection switching. Therefore, the method has a wider application range, more flexible modes, and more powerful protection functions.
  • the technical solution of the present invention is simple in design, has a fast switching speed, and can complete switching within 50ms, so it has almost no impact on various services carried.

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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 reprise en secours de service d'un dispositif dans un système de réseau de groupe ATM, qui est facile à mettre en oeuvre mais permet de protéger efficacement des fonctions. Ce procédé comprend la fourniture de canaux virtuels Internet pour la reprise en secours de service par configuration adéquate d'une connexion multidestination ou d'une connexion monodestination à des fins de prestation de service,en une fois, cela au moyen d'une alarme de couche physique et d'une alarme de couche ATM permettant au service une détection de défaillance rapide et une commutation. En particulier, pour protéger le terminal de destination contre une connexion virtuelle unilatérale, le noeud terminal source correspondant au noeud racine de connexion de canal virtuel multidestination est configuré. Mais, pour que le noeud source de la connexion virtuelle unilatérale soit protégé, une connexion de canal virtuel monodestination unilatérale est créée entre chaque terminal source (y compris un terminal de travail et deux autres terminaux) et le terminal de destination. Chaque connexion de canal virtuelle monodestination unilatérale présente le même identificateur de voie virtuelle (VPI)/identificateur de canal virtuel (VCI) et le même paramètre de flux, et l'une des connexions de canal virtuelles monodestination unilatérale peut être mise à l'état actif, l'autre connexion de canal virtuelle monodestination unilatérale étant mise à l'état non actif, en tant que connexion de réserve.
PCT/CN2004/000159 2003-06-23 2004-03-01 Procede de reprise en secours du service d'un dispositif dans un reseau de groupe atm (mode de transfert asynchrone) WO2004114594A1 (fr)

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CNB031294383A CN1306769C (zh) 2003-06-23 2003-06-23 一种异步传输模式组网内的业务备份方法
CN03129438.3 2003-06-23

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EP1848139A1 (fr) 2006-04-18 2007-10-24 THOMSON Licensing Méthode et appareil pour transmettre des données à plusieurs récepteurs en utilisant ARQ
CN101715648B (zh) * 2007-06-04 2012-11-14 艾利森电话股份有限公司 用于改进的频道转换的方法和设备
JP2011510534A (ja) * 2008-01-14 2011-03-31 アルカテル−ルーセント イーサネット（登録商標）仮想専用ルート権限付きマルチポイントサービスのスマートプロテクションのための方法およびシステム
WO2010000172A1 (fr) * 2008-06-30 2010-01-07 华为技术有限公司 Procédé, système, dispositif d'extrémité de réception et dispositif source de multidiffusion pour protection de multidiffusion
CN111385519B (zh) * 2018-12-29 2021-10-08 中兴通讯股份有限公司 实现视频会议恢复的方法、装置、终端及多点控制单元
CN109787895B (zh) * 2019-03-29 2020-10-27 烽火通信科技股份有限公司 一种双归保护方法、接入节点、设备及通信网络

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JP2000083030A (ja) * 1998-09-04 2000-03-21 Nec Corp Ａｔｍネットワークのブロードキャスト通信方法及びシステム
US6181680B1 (en) * 1996-03-01 2001-01-30 Fujitsu Limited Communication monitoring in ATM switch
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JPH08237253A (ja) * 1995-02-24 1996-09-13 Hitachi Ltd Ａｔｍ網のバーチャルパス切替方法及び装置
US6181680B1 (en) * 1996-03-01 2001-01-30 Fujitsu Limited Communication monitoring in ATM switch
JP2000083030A (ja) * 1998-09-04 2000-03-21 Nec Corp Ａｔｍネットワークのブロードキャスト通信方法及びシステム
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HK1072670A1 (en) 2005-09-02
WO2004114594A8 (fr) 2005-03-03
CN1306769C (zh) 2007-03-21
CN1567890A (zh) 2005-01-19

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