WO2016074417A1 - Procédé et dispositif de transmission de flux de données de service - Google Patents

Procédé et dispositif de transmission de flux de données de service Download PDF

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Publication number
WO2016074417A1
WO2016074417A1 PCT/CN2015/075307 CN2015075307W WO2016074417A1 WO 2016074417 A1 WO2016074417 A1 WO 2016074417A1 CN 2015075307 W CN2015075307 W CN 2015075307W WO 2016074417 A1 WO2016074417 A1 WO 2016074417A1
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WO
WIPO (PCT)
Prior art keywords
channel
service data
data stream
transmission
protection
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PCT/CN2015/075307
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English (en)
Chinese (zh)
Inventor
李景华
马静敏
何忠勇
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中兴通讯股份有限公司
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Publication of WO2016074417A1 publication Critical patent/WO2016074417A1/fr

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    • 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
    • H04L45/24—Multipath
    • H04L45/247—Multipath using M:N active or standby paths
    • 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

Definitions

  • the present invention relates to the field of communications, and in particular to a method and an apparatus for transmitting a service data stream.
  • the SNCP implementation method is very simple.
  • the protection switching of the service is implemented by the alarm monitoring module and the command switching module. After the SNCP protection is configured, the alarm monitoring module is responsible for monitoring the alarms on the working channel in real time. Once an alarm that triggers service switching occurs, the protection switching is implemented immediately.
  • the command switchover monitors various switching commands sent to and from the device by the NMS, and performs certain priority judgments, and then determines whether to perform protection switching. Since the service forwarding of SDH and MSTP devices is based on rigid forwarding of channels, service traffic can be quickly completed through the internal channel or time division cross-multiplexing structure of the device. Therefore, the implementation of SNCP in SDH and MSTP devices is simple and efficient.
  • STM-N When a packet transmission device is interconnected with an SDH or MSTP device, STM-N is generally used for docking. After the SDH or MSTP device transmits the alarmed or switched traffic to the packet transmission device, the packet transmission device must be able to respond to the alarm on the one hand, and cooperate with the peer device to generate a service switching action. The traffic can be selectively received. Since there is no time division cross-multiplexing structure inside the packet device, the implementation of SNCP protection must take a different approach.
  • the packet transmission device In the scenario where the packet transmission device is connected to the SDH or the MSTP in the related art, the packet transmission device only supports port level protection, and the channel level protection is generally used for alarm conversion when interfacing with the SDH. Or the manner in which the alarm is propagated to forward-compatible the completed service switching, the packet transmission device itself does not have a channel-level protection scheme.
  • the embodiment of the invention provides a method and a device for transmitting a service data stream, so as to at least solve the problem that only the port level protection is supported in the related art.
  • a service data stream transmission method including: establishing a working channel and a protection channel of a service data stream; detecting the service data stream; and obtaining the working channel and the location according to the detection result.
  • the selected channel in the protection channel is used for service data stream transmission.
  • the detecting the service data flow includes: performing alarm detection on the service data flow; and selecting, in the case that the detection result is that the synchronization data system SDH or the multi-service transmission platform MSTP network link is normal according to the alarm detection, selecting the The working channel performs the service data stream transmission; and/or, in the case that the detection result is determined by the alarm detection to be a synchronous data system SDH or a link failure of the multi-service transmission platform MSTP network to generate a subnet connection protection SNCP switching, The protection channel performs the service data stream transmission.
  • Selecting a channel from the working channel and the protection channel to perform service data stream transmission according to the detection result includes: packetizing the payload of the service data stream into an Ethernet frame format, where the Ethernet frame format is The VCID in the VLAN of the virtual local area network is used to distinguish the channel selected by the service data stream, and the service data stream is transmitted according to the selected channel.
  • the method further includes: after the link failure of the SDH or the MSTP network is restored, the service data flow is returned to the working channel for transmission.
  • Selecting a channel from the working channel and the protection channel to perform service data stream transmission according to the detection result includes: transmitting the service data stream simultaneously in the working channel and the protection channel; if no SNCP switching occurs, The traffic data stream received from the protection channel is discarded.
  • a service data stream transmission apparatus including: an establishing module, configured to establish a working channel and a protection channel of a service data flow; and a detecting module configured to detect the service data stream And a transmission module configured to select a channel from the working channel and the protection channel to perform service data stream transmission according to the detection result.
  • the detecting module includes: a detecting unit configured to perform alarm detection on the service data flow; and a first selecting unit configured to determine, according to the alarm detection, that the detection result is a synchronous data system SDH or a multi-service transmission platform MSTP network link Normally, the working channel is selected to perform the service data stream transmission; and/or the second selecting unit is configured to determine, according to the alarm detection, that the detection result is a synchronous data system SDH or a chain of a multi-service transmission platform MSTP network.
  • the protection channel is selected to perform the service data stream transmission.
  • the transmission module includes: a first transmission unit configured to perform packetization processing on a payload of the service data flow into an Ethernet frame format, and use a VCID in a virtual local area network VLAN field to distinguish the Ethernet frame format
  • the channel selected by the service data stream transmits the service data stream according to the selected channel.
  • the apparatus further includes: a second transmission unit configured to return the service data stream to the working channel for transmission after the link failure of the SDH or the MSTP network is restored.
  • the transmission module includes: a simultaneous transmission unit configured to simultaneously transmit the service data stream in the working channel and the protection channel;
  • the transport unit is discarded and is set to discard the traffic data stream received from the protection channel without generating an SNCP switch.
  • a working channel and a protection channel for establishing a service data flow are used; the service data flow is detected; and a service channel is selected from the working channel and the protection channel according to the detection result, and the service data stream is transmitted.
  • the packet transmission network is connected to the MSTP/SDH network, and the problem of channel level protection cannot be realized.
  • the channel protection device achieves channel protection for the service data stream.
  • FIG. 1 is a flowchart of a method for transmitting a service data stream according to an embodiment of the present invention
  • FIG. 2 is a block diagram of a service data stream transmission apparatus according to an embodiment of the present invention.
  • FIG. 3 is a block diagram 1 of a service data stream transmission apparatus in accordance with a preferred embodiment of the present invention.
  • FIG. 4 is a block diagram 2 of a service data stream transmission apparatus in accordance with a preferred embodiment of the present invention.
  • FIG. 5 is a block diagram 3 of a service data stream transmission apparatus in accordance with a preferred embodiment of the present invention.
  • FIG. 6 is a block diagram 4 of a service data stream transmission apparatus in accordance with a preferred embodiment of the present invention.
  • FIG. 7 is a structural block diagram of an internal system of a packet transfer device in accordance with a preferred embodiment of the present invention.
  • FIG. 8 is a first schematic diagram of a packet transmission system application networking according to a preferred embodiment of the present invention.
  • FIG. 9 is a second schematic diagram of a packet transmission system application networking according to a preferred embodiment of the present invention.
  • FIG. 10 is a flow chart 1 of traffic flow transmission in a packet transmission device system in accordance with a preferred embodiment of the present invention
  • FIG. 11 is a flow chart 2 of traffic flow transmission in a packet transmission device system in accordance with a preferred embodiment of the present invention.
  • FIG. 12 is a flow chart 3 of traffic flow transmission in a packet transfer device system in accordance with a preferred embodiment of the present invention.
  • FIG. 13 is a flow chart 4 of traffic flow transmission in a packet transfer device system in accordance with a preferred embodiment of the present invention.
  • FIG. 1 is a flowchart of a service data stream transmission method according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps:
  • Step S102 establishing a working channel and a protection channel of the service data stream
  • Step S104 detecting the service data stream
  • Step S106 Select a channel from the working channel and the protection channel to perform service data stream transmission according to the detection result.
  • the working channel and the protection channel of the service data flow are established; the service data stream is detected; and the service data stream is selected from the working channel and the protection channel according to the detection result, and the packet transmission in the related art is solved.
  • the problem of channel-level protection cannot be achieved, and the channel protection device achieves channel protection for the service data stream.
  • the active network device is used as the synchronous data system SDH or the multi-service transmission platform (MSTP).
  • the detecting the service data flow may include: Performing alarm detection on the service flow data (that is, the service data flow); and selecting the working channel to perform the service data flow transmission if the detection result is that the link of the SDH or the MSTP network is normal according to the alarm detection; and/or In the case that the detection result is determined by the alarm detection to be a synchronous data system SDH or a link failure of the multi-service transmission platform MSTP network to generate a sub-network connection protection SNCP switching, the protection channel is selected to perform the service data stream transmission.
  • the method of selecting a channel for the transmission of the service data stream may be performed in a plurality of manners.
  • selecting a channel for the service data stream transmission from the working channel and the protection channel according to the detection result may include:
  • the payload of the service flow data is encapsulated into an Ethernet frame format, and the VCID in the virtual local area network (VLAN) field is used to distinguish the channel selected by the service flow data, and the service is selected according to the selected channel.
  • Stream data is transmitted.
  • the protection channel is selected for the service data stream transmission, after the link failure of the SDH or the MSTP network is restored, the service flow data is returned to the working channel for transmission.
  • selecting a channel for the service data stream transmission from the working channel and the protection channel according to the detection result may further include: simultaneously transmitting the service data stream in the working channel and the protection channel; If no SNCP switching occurs, the service flow data received from the protection channel is discarded.
  • the embodiment of the present invention further provides a service data stream transmission device, which is configured to implement the foregoing embodiments and preferred embodiments, and has not been described again.
  • a service data stream transmission device configured to implement the foregoing embodiments and preferred embodiments, and has not been described again.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 2 is a block diagram of a service data stream transmission apparatus according to an embodiment of the present invention. As shown in FIG. 2, the method includes: an establishing module 22, a detecting module 24, and a transmitting module 26. The following briefly describes each module.
  • the establishing module 22 is configured to establish a working channel and a protection channel of the service data flow
  • the detecting module 24 is configured to detect the service data stream
  • the transmission module 26 is configured to select a channel from the working channel and the protection channel to perform service data stream transmission according to the detection result.
  • FIG. 3 is a block diagram 1 of a service data stream transmission apparatus according to a preferred embodiment of the present invention.
  • the detection module 24 includes:
  • the detecting unit 32 is configured to perform alarm detection on the service flow data.
  • the first selecting unit 34 is configured to select the working channel to perform the service data stream transmission if the detection result is that the synchronization data system SDH or the multi-service transmission platform MSTP network link is normal according to the alarm detection; and/or,
  • the second selecting unit 36 is configured to select the protection channel to perform the service data if the detection result is that the detection result is the synchronous data system SDH or the link failure of the multi-service transmission platform MSTP network generates the sub-network connection protection SNCP switching according to the alarm detection. Streaming.
  • the transmission module 26 includes:
  • the first transmission unit 42 is configured to perform packetization processing on the payload of the service flow data into an Ethernet frame format, and use the VCID in the virtual local area network VLAN field to distinguish the channel selected by the service flow data in the Ethernet frame format.
  • the service flow data is transmitted according to the selected channel.
  • FIG. 5 is a block diagram 3 of a service data stream transmission apparatus according to a preferred embodiment of the present invention. As shown in FIG. 5, the apparatus further includes:
  • the second transmission unit 52 is configured to return the service flow data to the working channel for transmission after the link failure of the SDH or the MSTP network is restored.
  • FIG. 6 is a block diagram 4 of a service data stream transmission apparatus according to a preferred embodiment of the present invention.
  • the transmission module 26 includes:
  • the transmitting unit 62 is configured to simultaneously transmit the service data stream in the working channel and the protection channel;
  • the drop transmission unit 64 is arranged to discard the traffic flow data received from the protection channel without generating an SNCP switch.
  • the packet transmission device in the channel protection system of the present invention includes a packet processing unit and a packet switching control unit, and the functions of the two units are established by the module 22 and the detection module 24 in the embodiment of the present invention. It is implemented together with the transmission module 26, and each segment element will be briefly described below.
  • FIG. 7 is a structural block diagram of an internal system of a packet transfer device according to a preferred embodiment of the present invention.
  • a packet processing unit is connected to an STM-N link outside the packet transfer device, and the STM-N link may be The working channel and protection channel with the SDH or MSTP device may also be the STM-N link that the packet transmitting device needs to forward the service.
  • the packet processing unit is responsible for extracting alarms and payloads in the STM-N link input from the external device, and transmitting the alarm information to the packet switching control unit to perform packetization processing on the payload.
  • the packet switching control unit is configured to process the packet transmitted by the packet processing unit, and the processing includes the selection of the forwarding port, the discarding of the traffic, and the like, and processes the control information transmitted by the packet processing unit, such as an alarm, to process the alarm information and The priority operation of the manual switching command.
  • the method for implementing channel protection by the packet transmission device in the optional embodiment includes: establishing a channel protection relationship, performing alarm detection and payload packetization processing on the service flow.
  • the packet processing unit A serves as a working channel
  • the packet processing unit B serves as a protection channel.
  • both the packet processing unit A and the packet processing unit B receive the traffic.
  • the alarm is detected according to the overhead of the SDH service flow, and the payload of the service is packetized into an Ethernet frame format, and the destination MAC of the Ethernet frame (Media Access Control) is a fixed MAC of the packet switching control unit.
  • the source MAC is the fixed MAC of the processing unit in which it is located.
  • the VCID in the VLAN (Virtual LAN) field is used in the frame format to distinguish which channel, time slot, or cascading group the service belongs to in the STM-N.
  • the alarm information and the packetized processed payload are then sent to the packet switching control unit.
  • the packet switching control unit processes the alarm information and determines the service forwarding.
  • the packet switching control unit performs priority calculation according to the received alarm information and the switching state of the local end, and determines whether the service flow is received from the working channel or the protection channel, and the packet information is forwarded to the packet processing unit C according to the service configuration relationship.
  • the packet processing unit C decapsulates and sends the traffic to the external channel.
  • the packet processing unit C decapsulates the received Ethernet frame, fills the information in the received frame into a channel or time slot configured by the user, and then sends it out from the external channel.
  • the internal system structure applied to the packet transfer device in the alternative embodiment is as shown in FIG. 7.
  • the working channel and the protection channel are respectively connected to the working channel and the protection channel of the SDH or MSTP device configured with SNCP protection, and the docking particles are connected.
  • the degree can be STM-N level, or it can be VC4, VC3, VC12 level.
  • the external channel in FIG. 7 is a channel for which the packet transmission device forwards the service received from the SDH or the MSTP device, and the granularity may also be STM-N, VC4, VC3, and VC12.
  • the double arrow in FIG. 7 is the control channel.
  • FIG. 8 is a first schematic diagram of a packet transmission system application networking according to a preferred embodiment of the present invention. As shown in FIG. 8, the above-mentioned packet transmission device 1 in the alternative embodiment is applied, and may be associated with 2, 3, 4, etc.
  • the network composed of SDH or MSTP devices cooperates to implement channel protection, and the granularity is VC4, VC3, and VC12.
  • FIG. 9 is a second schematic diagram of a packet transmission system application networking according to a preferred embodiment of the present invention. As shown in FIG. 9, two or more packet transmission devices may be connected to perform service flow data transmission.
  • FIG. 10 is a flowchart 1 of the service flow transmission in the packet transmission device system according to the preferred embodiment of the present invention, as shown in FIG. The process includes:
  • Step S1002 The packet transmission device PTN configures local service and channel protection
  • Step S1004 In the case that the SNCP protection of the SDH or the MSTP network is not reversed, the system receives data of various granularity from the working channel 1 port;
  • Step S1006 After the packet processing unit A completes the alarm detection (the overhead alarm is not detected), the packet is packetized to complete the encapsulation of the Ethernet frame format, and the destination MAC is the fixed MAC of the packet switching control unit, and the source MAC is its own. a fixed MAC of the packet processing unit A, and the packet is sent to the packet switching control chip;
  • Steps S1008-S1010 the packet control chip system forwards the packet to the 11 port according to the configuration relationship of the service, and the packet processing unit C receives the packet from the 6 port, performs packet processing, and fills the channel or time slot configured by the user. And sent out from the external channel 6.
  • the other way of the traffic is handled in the same way, except that the packet switching control unit needs to duplicate the traffic received from port 12 and send it to port 10 of the 8-port protection channel of the working channel. When no switching occurs, the traffic received by the system from the protection channel is completely discarded.
  • step S1012 the service flow data is transmitted to the external channel.
  • FIG. 11 is a second flowchart of traffic flow transmission in a packet transmission device system according to a preferred embodiment of the present invention. As shown in Figure 11, the process includes:
  • Step S1102 the packet transmission device configures service and channel protection
  • Step S1104 When a link fault occurs in the SDH or MSTP network to generate SNCP protection switching, the service traffic of the SDH or MSTP network enters the system from the protection channel in FIG. 7;
  • Step S1106 it is determined whether there is a link fault in the SDH or MSTP network is restored, if the determination result is yes, step S1110 is performed, and if the determination result is no, step S1108 is performed;
  • Step S1108 the packet processing unit A receives the overhead alarm from the channel 1 and transmits it to the packet switching control unit.
  • step S1110 the alarm transmitted by the packet processing unit A to the packet control unit disappears
  • Step S1112 the packet switching control unit performs protection switching, and receives the service from the channel 9.
  • Step S1114 after the packet switching control unit waits for the WTR, performs protection failback, and receives the service from the channel 7.
  • Step S1116 the packet processing unit C receives the data from the channel 11 and performs depacketization processing, and sends the data to the external channel.
  • step S1118 the transmission is performed on the external channel.
  • the packet processing unit A must transmit an alarm to the packet control unit from the channel overhead received by the working channel 1 port, and the alarm detecting module in the packet control unit immediately performs protection switching after detecting the alarm.
  • the protection channel 9 port receives the service, and according to the data processing manner of steps S1008-S1010 of the implementation example, the packet data is forwarded to the packet processing unit 12 port.
  • packet processing unit C receives data from port 5, it also forwards the service to port 10 of the protection channel according to the same processing method. In this way, when there is a link failure in the SDH or MSTP network and the bidirectional traffic of the service needs to be switched, the entire system can work as described above.
  • the SDH or MSTP network is faulty.
  • the alarm module in the packet control unit detects that the alarm disappears, and immediately switches to receive and send the service from the working channel.
  • FIG. 12 is a flowchart 3 of the traffic flow transmission in the packet transmission device system according to the preferred embodiment of the present invention. As shown in 12, the process includes:
  • Step S1202 PTN configuration service and channel protection
  • step S1204 the PTN device sends an artificial switching command.
  • Step S1206 A link fault occurs on the SDH or the MSTP network, and an alarm is generated on the working link.
  • Step S1208 The packet switching control unit performs a switching priority calculation to determine which channel to receive the service from;
  • Step S1210 the packet processing unit C receives the data from the channel 11 and performs de-packet processing, and sends the data to the external channel.
  • Step S1212 an external channel.
  • the services in the SNCP network are received from the protection channel. Because the traffic of the service is always dual-issue, the system sends traffic to the working channel and the protection channel at the same time. At this time, the packet transmission system does not need to perform a switching operation. In this case, the traffic of the packet transmission device and the SDH or the MSTP device in both directions are simultaneously transmitted in different directions, that is, the working channel and the protection channel.
  • the packet switching control unit is required to perform the calculation of the switching priority, to determine from which packet processing unit the module receives data, and if the packet transmission device locks the traffic. In the working channel, there is a risk of business interruption.
  • the network composed of the packet transfer device 1 and the packet transfer device 2 to which the system of the present alternative embodiment is applied implements protection of the VCG group.
  • This protection scenario is to extend the application of VC12 granular channel protection, and bind multiple VC12-level channels in one VCG group to implement channel protection of the packet transmission device in the VCG group.
  • FIG. 13 is a flowchart 4 of traffic flow transmission in a packet transmission device system according to a preferred embodiment of the present invention. As shown in FIG. 13, the process includes:
  • Step S1302 the packet transfer devices 1 and 2 respectively configure a VCG group
  • Step S1304 the packet transmission device VCG1/VCG2 is configured to form a protection relationship
  • step S1308 the VCG is switched to the VCG protection link.
  • the VCG group is configured to be connected to the VCG group to form a VCG group protection relationship.
  • the working VCG group fails, the working VCG port fails to negotiate, and the VCG group is triggered to perform protection switching.
  • This protection switching scenario enables the VCG group to protect similar ports on the network side of the packet transmission device, but the VCG group is a virtual interface rather than a real physical interface.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. Perform the steps shown or described, or separate them into individual integrated circuit modules, or Multiple of these modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.
  • a method and an apparatus for transmitting a service data stream have the following beneficial effects: the problem that the channel-level protection between the packet transmission network and the MSTP/SDH network in the related art cannot be achieved is achieved.
  • the effect of channel protection on the traffic data stream is achieved by the packet transmission device.

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Abstract

L'invention concerne un procédé et un dispositif de transmission de flux de données de service, lequel procédé comprend les étapes consistant à : établir des canaux de travail et des canaux de protection pour des flux de données de service; détecter les flux de données de service; selon le résultat de la détection, choisir des canaux parmi les canaux de travail et les canaux de protection pour transmettre les flux de données de service. Grâce à la présente invention, il est possible de résoudre le problème de l'art antérieur selon lequel une protection de niveau de canal ne peut pas être réalisée dans la connexion de réseaux de transport par paquets et de réseaux plateforme de transport multi-services MSTP/hiérarchie numérique synchrone SDH, et le canal de protection pour le flux de données de service est obtenu par des dispositifs de transport de paquets.
PCT/CN2015/075307 2014-11-14 2015-03-27 Procédé et dispositif de transmission de flux de données de service WO2016074417A1 (fr)

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CN201410648317.6 2014-11-14

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CN109309530B (zh) * 2017-07-28 2023-08-01 中兴通讯股份有限公司 一种数据传输方法和装置
CN109560864B (zh) * 2017-09-26 2021-10-19 中兴通讯股份有限公司 一种数据传输方法和装置
CN109561012B (zh) * 2018-12-21 2021-05-28 安徽皖兴通信息技术有限公司 一种sdh网络与分组网络的通讯方法

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US20070086333A1 (en) * 2005-10-18 2007-04-19 Fujitsu Limited Path protection method and layer-2 switch
CN101145990A (zh) * 2007-08-02 2008-03-19 中兴通讯股份有限公司 一种通过串联监视功能实现子网连接保护的方法
CN102739430A (zh) * 2011-04-15 2012-10-17 中兴通讯股份有限公司 一种以太网保护倒换的实现方法和系统

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070086333A1 (en) * 2005-10-18 2007-04-19 Fujitsu Limited Path protection method and layer-2 switch
CN101145990A (zh) * 2007-08-02 2008-03-19 中兴通讯股份有限公司 一种通过串联监视功能实现子网连接保护的方法
CN102739430A (zh) * 2011-04-15 2012-10-17 中兴通讯股份有限公司 一种以太网保护倒换的实现方法和系统

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