WO2011147147A1 - 无源光网络中实现线路倒换后业务恢复的方法、系统及onu - Google Patents

无源光网络中实现线路倒换后业务恢复的方法、系统及onu Download PDF

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Publication number
WO2011147147A1
WO2011147147A1 PCT/CN2010/077374 CN2010077374W WO2011147147A1 WO 2011147147 A1 WO2011147147 A1 WO 2011147147A1 CN 2010077374 W CN2010077374 W CN 2010077374W WO 2011147147 A1 WO2011147147 A1 WO 2011147147A1
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Prior art keywords
line
optical network
switching
terminal device
network unit
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PCT/CN2010/077374
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English (en)
French (fr)
Inventor
柳清
郭汝明
刘晓亮
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中兴通讯股份有限公司
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Publication of WO2011147147A1 publication Critical patent/WO2011147147A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability

Definitions

  • the present invention relates to a Passive Optical System (PON) technology, and more particularly to a method, a system, and an Optical Network Unit (ONU) for implementing service recovery after a line switching in a passive optical network.
  • PON Passive Optical System
  • ONU Optical Network Unit
  • the access layer network is the basic platform for various services.
  • the rapid development of broadband access services has made the demand for data bandwidth of the access layer continue to grow.
  • optical fiber makes optical fiber access a development direction of access network.
  • Passive optical network technology is characterized by its "passive", that is, the Optical Distribution Network (ODN) is composed of passive optical components such as passive optical splitters and optical fibers, and does not include any active devices, and
  • ODN Optical Distribution Network
  • the advantages of "point-to-multipoint" networking form make the passive optical network system have the advantages of simple maintenance, high reliability and low cost, and have become the industry-recognized fiber access (Fitor To The x, FTTx) system. Preferred option.
  • the PON system consists of an Optical Line Terminal (OLT), an ONU, and an Optical Distribution Network (ODN).
  • OLT is placed in the central office and the ONU is close to the end user.
  • the ODN is used to connect the OLT to the ONU.
  • the included fiber extends a long distance and is placed outdoors.
  • the ONUs carrying important services must be protected by uplink redundancy.
  • FIG 1 when a single OLT is used for fiber backup, if the OLT fails, the service is interrupted, and in actual cabling, usually The main backup optical fiber of the same OLT is placed in the same pipeline. It is very likely that the backup optical fiber is destroyed at the same time and the line protection is lost.
  • the line backup method across the OLT shown in Fig. 2 is proposed.
  • the ONUs with the active and standby uplinks can be registered to the two OLTs at the same time. Only one of the lines can be used as the primary line to send and receive service data.
  • the ONU detects that the main line is interrupted or receives a switching command, the ONU completes itself. The switching of the alternate line, so that the business is not affected.
  • Figure 3 shows the network for protection of services through the primary and backup lines in a passive optical network.
  • the upper switching device (generally an Ethernet switch) S of the OLT1 in the active line learns the data link layer address of the terminal device A from its port a.
  • the data link layer address identifier is generally a media access control (MAC) address, which is also called a physical address.
  • MAC media access control
  • the line protection switching time is not equal to the service recovery time.
  • the ONU reverses the service of the terminal device from the active line to the backup line, although the physical transmission line has been successfully switched, the corresponding relationship between the MAC address table and the downlink port of the terminal device on the switching device S cannot be updated in time.
  • the message sent by device H to terminal device A will still be sent down by port a, instead of being sent through port b for connecting OLT2 in the alternate line. In this way, the terminal device service can only be restored when the MAC address of the terminal device A ages or is updated on the switching device S.
  • the automatic aging process of the MAC address maintained on the switching device S is usually 300 seconds.
  • the update process of the MAC address maintained on the switching device S can be completed by the handshake mechanism of the service itself.
  • the update of the MAC address of the terminal device on the switching device S is completed, so that the switching device S knows that the terminal device A needs to be delivered from the port b.
  • Data, the time spent on this process is usually in the order of seconds. For some important services or services that users require to guarantee the quality of service, the speed of restoring services after performing the above line switching cannot meet the requirements. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a method for realizing service recovery after line switching in a passive optical network. After performing line protection switching, the service of the terminal device can be quickly recovered.
  • the present invention provides a method for implementing service recovery after a line switching in a passive optical network, including: after the optical network unit completes switching from the primary line to the backup line, constructing and transmitting, by using the standby line, An uplink data packet identified by the data link layer address of the terminal device, after the switching device receives the uplink data packet, and sends data to the terminal device by using the standby line.
  • the above method also has the following characteristics:
  • the switching device After receiving the uplink data packet, the switching device is modified by the backup line to the terminal device port as a port on the switching device for connecting the standby line, and is used by the switching device to connect to the The port of the backup line sends data to the terminal device.
  • the terminal device is a preset terminal device that needs to perform service recovery protection preset by the optical network unit;
  • optical network unit After the optical network unit completes the switching from the primary line to the backup line, and constructs and transmits and belongs to the user network interface, constructs and sends an uplink data packet including the data link layer address identifier.
  • the step of constructing and transmitting includes: constructing the data link layer address identifier for the active user network interface under the preset user network interface The upstream packet identified by the layer address is sent and sent.
  • the uplink data packet is a broadcast type data packet
  • the source address is a data link layer address identifier of the terminal device
  • the target address is a broadcast address.
  • the data link layer address identifier is a media access control address.
  • a system for implementing service recovery after line switching in a passive optical network of the present invention includes an optical network unit and a switching device;
  • the optical network unit is configured to: after completing the switching from the primary line to the backup line, construct and send, by using the standby line, an uplink data packet that includes a data link layer address identifier of the terminal device; the switching device is configured to: Receiving, by the backup line, the uplink data packet The terminal device sends data.
  • the switching device is configured to: after receiving the uplink data packet, modify a downlink port corresponding to the data link layer address identifier of the terminal device to a port on the switching device for connecting the standby line, And transmitting data to the terminal device by using the port that is connected to the standby line.
  • the optical network unit includes a service recovery processing determination module and a notification module;
  • the service recovery processing judging module is configured to: when the optical network unit completes the line switching, and sends a trigger message to the notification module;
  • the notification module is configured to: after receiving the trigger message of the service recovery processing determination module, construct and send an uplink data packet that includes the data link layer address identifier; wherein the terminal device is the optical network unit preset Terminal equipment that needs to be protected by business recovery.
  • the optical network unit includes a service recovery processing determination module and a notification module;
  • the service recovery processing judging module is configured to: when the optical network unit completes the line switching, and determines that the preset user network interface includes the active data link layer address identifier, sends a trigger message to the notification module. ;
  • the notification module is configured to: after receiving the trigger message of the service recovery processing determination module, send and send the uplink data packet according to the link layer address.
  • the present invention also provides an optical network unit for implementing service recovery after line switching in a passive optical network, where the optical network unit is configured to: after completing the switching from the primary line to the backup line, construct and pass the standby line Sending, to the switching device, an uplink data packet that includes the data link layer address identifier of the terminal device; and after the receiving the uplink data packet, the switching device sends data to the terminal device by using the standby line.
  • the optical network unit includes a service recovery processing determination module and a notification module;
  • the service recovery processing judging module is configured to: when the optical network unit completes the line switching, and sends a trigger message to the notification module;
  • the notification module is configured to: after receiving the trigger message of the service recovery processing determination module, construct and send an uplink data packet that includes the data link layer address identifier.
  • the optical network unit includes a service recovery processing determination module and a notification module;
  • the service recovery processing judging module is configured to: when the optical network unit completes the line switching, and determines that the preset user network interface includes the active data link layer address identifier, sends a trigger message to the notification module. ;
  • the notification module is configured to: after receiving the trigger message of the service recovery processing determination module, the preset user network interface
  • the upstream packet identified by the link layer address is sent and sent.
  • the data link layer address identifier of the terminal device is notified to the switching device in time, so that the switching device can quickly learn the location update of the terminal device, and timely convert the port that sends the downlink data, and pass the data.
  • the backup line is delivered, so that the service of the terminal device can be restored in time, and the time-consuming recovery of the service is controlled in milliseconds to ensure reliable communication of important services.
  • this method is simple to implement and only improves ONU, and does not require any modification of devices such as OLT and aggregation switch.
  • Figure 1 is a schematic diagram of networking of a single OLT line backup
  • FIG. 2 is a schematic diagram of networking of backup across OLT lines
  • FIG. 3 is a schematic diagram of a network structure for performing service protection through a primary line and an alternate line in a passive optical network
  • FIG. 4 is a structural diagram of a system for implementing fast service recovery after line switching in an embodiment
  • FIG. 5 is a flowchart of a method for implementing fast service recovery after line switching in an embodiment
  • FIG. 6 is a flowchart of a method for implementing fast service recovery after line switching in the first embodiment
  • FIG. 7 is a flowchart of a method for implementing fast service recovery after line switching in the second embodiment.
  • a system for implementing fast service recovery after line switching in a passive optical network includes an optical network unit and a switching device.
  • the uplink data packet including the data link layer address identifier of the terminal device is constructed and transmitted through the standby line. Exchange data.
  • the switching device After receiving the uplink data packet, the switching device modifies the downlink port corresponding to the data link layer address identifier of the terminal device to a port on the switching device for connecting the standby line, and the port is used to connect to the The terminal device sends data.
  • the optical network unit includes a service recovery processing judgment module and a notification module.
  • the system can use the following methods to implement fast service recovery:
  • the service recovery processing judging module is configured to send a trigger message to the notification module after the optical network unit completes the line switching.
  • the notification module is configured to construct and send an uplink data packet including the data link layer address identifier after receiving the trigger message of the service recovery processing determining module.
  • the terminal device is a terminal device preset for the optical network unit to perform service recovery protection.
  • the service recovery processing judging module is configured to send a trigger message to the notification module when the pre-established user network interface includes the active data link layer address identifier after the optical network unit completes the line switching.
  • the notification module is configured to: after receiving the trigger message of the service recovery processing judgment module, construct an uplink data packet that includes the data link layer address identifier for the active data link layer address identifier of the preset user network interface. And send.
  • the uplink data packet sent by the optical network unit in this system is a broadcast type data packet, and the source address is the end.
  • the data link layer address identifier of the end device, and the target address is a broadcast address.
  • This upstream packet is a packet with no special meaning. If the upper-level switching device receives the data packet, because the data packet does not have a specific operational meaning, the upper-level switching device only learns that the data link layer address identifier of the terminal device in the data packet does not perform other operations.
  • the above data link layer address identifier is generally referred to as a media access control address, that is, a MAC address.
  • the method for implementing fast service recovery after line switching in a passive optical network includes: after the optical network unit completes switching from the primary line to the backup line, constructing and transmitting, by using the standby line, the terminal device The uplink data packet identified by the data link layer address, and the switching device sends the data to the terminal device through the backup line after receiving the uplink data packet.
  • the switching device After receiving the uplink data packet, the switching device modifies the downlink port corresponding to the data link layer address identifier of the terminal device to a port on the switching device for connecting the standby line, and sends the terminal to the terminal through the port.
  • the device sends data.
  • the data link layer address identifier of the terminal device usually refers to the MAC address.
  • the ONU When the ONU sends an uplink packet through the backup line, it passes through the standby OLT to the switching device, and the standby OLT learns the MAC address of the terminal device from the uplink data packet, and also updates the MAC address of the terminal device.
  • a protection object that needs to be service recovery protection may be preset, and the protection object may be a terminal device or a preset user network interface (UNI) The object's way to achieve the ultimate goal of protecting the terminal device belonging to the interface.
  • UNI user network interface
  • the optical network unit notifies the data link layer address identifier of the terminal device to the switching device in time after performing the line protection switching, so that the switching device can quickly learn the location update of the terminal device, and timely convert the port that sends the downlink data.
  • the data is delivered through the backup line, so that the service of the terminal device can be restored in time, and the time-consuming recovery of the service is controlled in milliseconds to ensure reliable communication of important services.
  • the protection object set in the first embodiment is a terminal device.
  • the preset protection object is a terminal device, it can also be understood that the protection object is a data link layer address identifier.
  • the terminal device identifier and its data link layer address identifier can be regarded as corresponding.
  • the optical network unit can set all terminal devices under its management to be protected, and some terminal devices can be protected.
  • the method for implementing fast service recovery after line switching in the first embodiment includes: when the optical network unit completes and belongs to the user network interface, constructing and transmitting an uplink data packet including the data link layer address identifier.
  • Step 601 The service of the terminal device is transmitted through the primary line, and after the ONU detects the failure of the primary line or receives the switching command, the switching from the primary line to the standby line is completed.
  • Step 602 The ONU determines whether the MAC address of the terminal device is in an active state. If yes, the next step is performed, otherwise the process is not completed, and the process ends.
  • Step 603 The ONU determines whether the MAC address of the terminal device belongs to the U I interface. If yes, the next step is performed, otherwise the process is not completed, and the process ends.
  • the U I interface is used to connect the terminal device, and the uplink port is used to aggregate user traffic and connect to the upper device. If the MAC address of the terminal device belongs to the U I interface, the terminal device corresponding to the MAC address is located in the lower level of the ONU in the passive optical network. If the MAC address of the terminal device belongs to the uplink port, the terminal device corresponding to the MAC address is located in the upper level of the ONU in the passive optical network. In this case, the ONU cannot construct the data packet containing the MAC address and send it from the uplink port. Otherwise, it will cause an error update of the network location of the terminal device.
  • the source address of the uplink packet constructed by the ONU is the MAC address of the terminal device, the destination address is a broadcast address, and the uplink data packet is a data packet with no special meaning. If the upper-level switching device receives the data packet, since the data packet has no specific operational meaning, the upper-level switching device only learns the source MAC address indicated in the data packet and does not perform other operations.
  • Step 605 The ONU sends an uplink data packet by using an alternate line. When the ONU sends this upstream packet, it sends it through the uplink port.
  • the ONU may start a retimer after the uplink packet is sent. When the retimer reaches the set time, the ONU resends the uplink packet.
  • the protection object set in the second embodiment is a U I interface.
  • the optical network unit can be set to protect all U I interfaces under its management, or some U I interfaces need to be protected.
  • the method for implementing the fast service recovery after the line switching in the second embodiment includes: after the line switching is completed, the data link layer address identifier structure that is active in the preset user network interface includes the data link layer.
  • the upstream packet identified by the address is sent.
  • Step 701 The service of the terminal device is transmitted through the primary line, and after the ONU detects the failure of the primary line or receives the switching command, the switching from the primary line to the standby line is completed.
  • Step 702 The ONU determines whether there is an active MAC address under the preset user network interface, and if yes, performs the next step; otherwise, does not process, and ends the process.
  • the source address in the uplink packet constructed by the ONU is the MAC address
  • the destination address is the broadcast address
  • the uplink packet is a packet with no special meaning. If the upper switching device receives the data packet, the data packet has no specific operational meaning, so the upper switching device only learns the source MAC address indicated in the data packet and does not perform other operations.
  • Step 704 The ONU sends an uplink data packet by using an alternate line.
  • the ONU When the ONU sends this upstream packet, it sends it through the uplink port.
  • the ONU in order to prevent the first uplink packet from being lost due to unstable circuit, the ONU can start the retimer after the uplink packet is sent. When the retimer reaches the set time, the ONU Resend this upstream packet.
  • the method for realizing rapid service recovery after line switching includes:
  • Step S101 The ONU determines the MAC address of the device A to be service-protected, and configures the service protection data in the ONU, and configures the MAC address.
  • step S102 the ONU continuously scans the state of the uplink port 1. When it detects that the primary line connection (Link) 1 is faulty or receives a switching command, it immediately triggers the switching to the backup line Link2.
  • Link the primary line connection
  • Step S103 After the line switching is completed, the ONU determines the current state of the MAC address of the protection device A.
  • Step S104 if the MAC is not in an active state, no operation is performed.
  • Step S105 If the MAC is in an active state, continue to determine whether the MAC address belongs to the UI interface of the ONU. If not, go to step S106; if yes, go to step S107.
  • Step S106 When the MAC address does not belong to the U I interface but belongs to the uplink port, no operation is performed, and the process ends.
  • Step S107 The MAC address belongs to the U I interface, and the ONU constructs a U KOWN ARP packet whose source address is the MAC address, the destination address is the broadcast address ff:ff:ff:ff:ff, and the operation code is all 0s.
  • Step S108 the ONU sends the constructed data packet from the switched uplink port 2 along the backup line Iink2.
  • Step S109 in order to prevent the data packet sent for the first time from being lost due to instability of the line, the ONU starts the retransmission timer after sending the first data packet.
  • Step S110 The retransmission timer expires, and the ONU resends the data packet.
  • the method for realizing rapid service recovery after line switching includes:
  • Step S201 The ONU determines the U I interface that needs to be service recovery protection, and the ONU configures the service protection data, and configures the interface.
  • Step S202 The ONU continuously scans the state of the uplink port 1 and immediately triggers the switching to the backup line Link2 upon detecting the failure of the main line Link1 or receiving the switching command.
  • Step S203 After the line switching is completed, the ONU determines whether there is an active MAC address under the pre-configured U I interface to be protected. If yes, step S205 is performed; if not, step S204 is performed.
  • Step S204 if there is no active MAC address, no operation is performed, and the process ends.
  • Step S205 For the active MAC address, the ONU constructs an UNKOWN ARP packet whose source address is the MAC address, the destination address is the broadcast address ff:ff:ff:ff:ff:ff, and the operation code is all 0.
  • Step S206 the ONU sends the constructed data packet from the switched uplink port 2 along the backup line Iink2.
  • Step S207 in order to prevent the data packet sent for the first time from being lost due to instability of the line, the ONU starts the retransmission timer after issuing the first data packet.
  • Step S208 the retransmission timer expires, and the ONU resends the data packet.
  • the data link layer address identifier of the terminal device is notified to the switching device in time after the line protection switching is performed, so that the switching device can quickly learn the location update of the terminal device, and timely convert the port that sends the downlink data.
  • the data is delivered through the backup line, so that the service of the terminal device can be restored in time, and the time-consuming recovery of the service is controlled in milliseconds to ensure reliable communication of important services.
  • this method is simple to implement and only improves the ONU, and does not require any modification of devices such as OLTs and aggregation switches.

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Description

无源光网络中实现线路倒换后业务恢复的方法、 系统及 ONU
技术领域
本发明涉及无源光网络 ( Passive Optical System, 简称 PON )技术， 尤 其涉及无源光网络中实现线路倒换后业务恢复的方法、 系统及光网络单元 ( Optical Network Unit, 简称 ONU ) 。 背景技术
接入层网络是各种业务开展的基础平台， 近年来宽带接入业务的快速发 展使得接入层对于数据带宽的需求呈现出持续增长的态势。 光纤作为传输高 速率、 容量大、 支持多业务的最佳媒质， 使得光纤接入成为接入网的一个发 展方向。无源光网络技术因其"无源 "的特点，即光分配网（ Optical Distribution Network, 简称 ODN )全部由无源光分路器和光纤等无源光器件组成不包括 任何有源器件， 以及 "点到多点" 组网形态的优势， 使无源光网络系统具有 维护简单、可靠性高、成本低的优势，已经成为业界公认的实现光纤接入 ( Fiber To The x, FTTx ) 系统的首选方案。
PON系统由光线路终端（ Optical Line Terminal, 简称 OLT ) 、 ONU和光 分配网（ ODN )组成。 OLT—般置于中心机房而 ONU则贴近最终用户， ODN 用于连接 OLT和 ONU, 包含的光纤延伸距离通常比较长且布放在室外。 承 载重要业务的 ONU必须釆用上行线路冗余的方式来保护，如图 1所示，使用 单个 OLT实现光纤备份时， 如果此台 OLT发生故障， 业务便会中断， 并且 在实际布线中，通常同一 OLT的主备份光纤布放在同一管线中的可能性很大， 即主用光纤被破坏时备份光纤很可能同时被破坏， 失去线路保护的能力。
为了提高线路保护能力， 提出了图 2所示的跨 OLT的线路备份方式。 具 有主备上行线路的 ONU可以同时注册到两台 OLT上， 只使用其中的一条线 路作为主用线路收发业务数据，当 ONU检测到主用线路中断或收到倒换命令 时， 由 ONU自行完成向备用线路的倒换， 从而使业务不受影响。
图 3中示出了无源光网络中通过主用线路和备用线路进行业务保护的网 络结构。 当 ONU管理下的终端设备 A与上级设备 H正常通信时， 连接主用 线路中 OLT1的上级交换设备 (一般为以太网交换机） S从其端口 a上学习到 终端设备 A的数据链路层地址标识， 此数据链路层地址标识一般是媒体访问 控制 （ Media Access Control, 简称 MAC )地址也称为物理地址， 上级设备 H 发往终端设备 A的报文到达上级交换设备 S后， 交换设备 S根据 MAC地址 表从端口 a转发， 经由 OLT1到 ONU的方向到达终端设备 A。 ONU到 OLT1 的主用线路故障时或 ONU收到倒换命令时， ONU将终端设备的业务从主用 线路倒换到备用线路。
但是， 线路保护倒换时间并不等于业务恢复时间。 ONU将终端设备的业 务从主用线路倒换到备用线路后， 虽然物理传输线路已经切换成功， 但由于 交换设备 S上的终端设备的 MAC地址表与下行端口的对应关系不能得到及 时更新， 因此上级设备 H发往终端设备 A的报文仍然会由端口 a向下发送， 而不是经过用于连接备用线路中 OLT2的端口 b发送。 这样终端设备业务只 能等到终端设备 A的 MAC地址在交换设备 S上老化或得到更新时才能恢复。 交换设备 S上维护的 MAC地址自动老化过程的耗时一般为 300秒。 交换设 备 S上维护的 MAC地址的更新过程可以是通过业务自身的握手机制完成的， 完成交换设备 S上的终端设备 MAC地址的更新使交换设备 S得知需从端口 b 下发终端设备 A的数据， 这一过程的耗时通常为秒级。 对于一些重要业务或 用户要求保证服务质量的业务， 执行上述线路倒换后恢复业务的速度不能满 足其要求。 发明内容
本发明要解决的技术问题是提供无源光网络中实现线路倒换后业务恢复 的方法， 在执行线路保护倒换后， 使终端设备的业务能够得到快速恢复。
为了解决上述技术问题， 本发明提供了无源光网络中实现线路倒换后业 务恢复的方法， 包括： 光网络单元完成从主用线路至备用线路的倒换后， 构 造并通过所述备用线路发送包含所述终端设备的数据链路层地址标识的上行 数据包， 交换设备收到所述上行数据包后通过所述备用线路向所述终端设备 下发数据。 上述方法还具有以下特点：
所述交换设备收到所述上行数据包后通过所述备用线路向所述终端设备 口修改为所述交换设备上用于连接所述备用线路的端口， 通过所述交换设备 上用于连接所述备用线路的端口向所述终端设备下发数据。
上述方法还具有以下特点：
所述终端设备是所述光网络单元预设的需进行业务恢复保护的终端设 备；
所述光网络单元完成从主用线路至备用线路的倒换后， 所述构造并发送 且属于用户网络接口时， 构造并发送包含所述数据链路层地址标识的上行数 据包。
上述方法还具有以下特点：
所述光网络单元完成从主用线路至备用线路的倒换后， 所述构造并发送 的步骤包括： 为预设的用户网络接口下处于活动状态的数据链路层地址标识 构造包含所述数据链路层地址标识的上行数据包并发送。
上述方法还具有以下特点：
所述上行数据包是广播类型数据包， 源地址为所述终端设备的数据链路 层地址标识， 目标地址为广播地址。
上述方法还具有以下特点：
所述数据链路层地址标识是媒体访问控制地址。
为了解决上述技术问题， 本发明无源光网络中实现线路倒换后业务恢复 的系统， 包括光网络单元和交换设备；
所述光网络单元设置为： 完成从主用线路至备用线路的倒换后， 构造并 通过所述备用线路发送包含终端设备的数据链路层地址标识的上行数据包； 所述交换设备设置为： 收到所述上行数据包后通过所述备用线路向所述 终端设备下发数据。
上述系统还具有以下特点：
所述交换设备是设置为： 在收到所述上行数据包后将所述终端设备的数 据链路层地址标识对应的下行端口修改为所述交换设备上用于连接所述备用 线路的端口， 通过所述连接所述备用线路的端口向所述终端设备下发数据。
上述系统还具有以下特点：
所述光网络单元包括业务恢复处理判断模块、 通知模块；
所述业务恢复处理判断模块设置为：在所述光网络单元完成线路倒换后， 络接口时， 向所述通知模块发送触发消息；
所述通知模块设置为：在收到所述业务恢复处理判断模块的触发消息后， 构造并发送包含所述数据链路层地址标识的上行数据包； 其中终端设备是所 述光网络单元预设的需进行业务恢复保护的终端设备。
上述系统还具有以下特点：
所述光网络单元包括业务恢复处理判断模块、 通知模块；
所述业务恢复处理判断模块设置为：在所述光网络单元完成线路倒换后， 判断预设的用户网络接口下包含处于活动状态的数据链路层地址标识时， 向 所述通知模块发送触发消息；
所述通知模块设置为：在收到所述业务恢复处理判断模块的触发消息后， 据链路层地址标识的上行数据包并发送。
本发明还提供了一种无源光网络中实现线路倒换后业务恢复的光网络单 元， 所述光网络单元设置为： 完成从主用线路至备用线路的倒换后， 构造并 通过所述备用线路向交换设备发送包含终端设备的数据链路层地址标识的上 行数据包； 使所述交换设备收到所述上行数据包后通过所述备用线路向终端 设备下发数据。
所述光网络单元包括业务恢复处理判断模块、 通知模块； 所述业务恢复处理判断模块设置为：在所述光网络单元完成线路倒换后， 络接口时， 向所述通知模块发送触发消息；
所述通知模块设置为：在收到所述业务恢复处理判断模块的触发消息后， 构造并发送包含所述数据链路层地址标识的上行数据包。
所述光网络单元包括业务恢复处理判断模块、 通知模块；
所述业务恢复处理判断模块设置为：在所述光网络单元完成线路倒换后， 判断预设的用户网络接口下包含处于活动状态的数据链路层地址标识时， 向 所述通知模块发送触发消息；
所述通知模块设置为：在收到所述业务恢复处理判断模块的触发消息后， 为预设的用户网络接口
据链路层地址标识的上行数据包并发送。
本发明中在执行线路保护倒换后及时将终端设备的数据链路层地址标识 通知至交换设备的方式， 使交换设备快速获知终端设备的位置更新， 及时转 换下发下行数据的端口， 将数据通过备用线路下发， 从而使终端设备的业务 得到及时恢复， 将业务恢复的耗时控制在毫秒级， 保证重要业务的可靠通信。 另外， 此方法实现简单仅对 ONU进行改进， 不需要对 OLT、 汇聚交换机等 设备进行任何改造。
附图概述
图 1是单 OLT线路备份的组网示意图；
图 2是跨 OLT线路备份的组网示意图；
图 3是无源光网络中通过主用线路和备用线路进行业务保护的网络结构 示意图；
图 4是实施例中实现线路倒换后快速业务恢复的系统组成结构图； 图 5是实施例中实现线路倒换后快速业务恢复的方法流程图； 图 6是实施例一中实现线路倒换后快速业务恢复的方法流程图； 图 7是实施例二中实现线路倒换后快速业务恢复的方法流程图。
本发明的较佳实施方式
无源光网络中实现线路倒换后快速业务恢复的系统包括光网络单元和交 换设备。
光网络单元用于完成从主用线路至备用线路的倒换后， 构造并通过所述 备用线路发送包含所述终端设备的数据链路层地址标识的上行数据包。 交换 据。
交换设备在收到所述上行数据包后将所述终端设备的数据链路层地址标 识对应的下行端口修改为所述交换设备上用于连接所述备用线路的端口， 通 过此端口向所述终端设备下发数据。
如图 4所示， 光网络单元包括业务恢复处理判断模块、 通知模块。
实施例一， 本系统实现业务快速恢复时可釆用以下方式：
业务恢复处理判断模块用于在所述光网络单元完成线路倒换后， 判断所 时， 向所述通知模块发送触发消息。 通知模块用于在收到所述业务恢复处理 判断模块的触发消息后， 构造并发送包含所述数据链路层地址标识的上行数 据包。 上述终端设备是所述光网络单元预设的需进行业务恢复保护的终端设 备。
实施例二， 本系统实现业务快速恢复时还可以釆用以下方式：
业务恢复处理判断模块用于在所述光网络单元完成线路倒换后， 判断预 设的用户网络接口下包含处于活动状态的数据链路层地址标识时， 向所述通 知模块发送触发消息。 通知模块用于在收到所述业务恢复处理判断模块的触 发消息后， 为预设的用户网络接口下处于活动状态的数据链路层地址标识构 造包含此数据链路层地址标识的上行数据包并发送。
本系统中光网络单元发出的上行数据包是广播类型数据包， 源地址为终 端设备的数据链路层地址标识， 目标地址为广播地址。 此上行数据包是无特 殊含义的数据包。 上级交换设备如收到此数据包， 由于此数据包没有特定的 操作含义， 上级交换设备仅会学习数据包中指示终端设备的数据链路层地址 标识不会做其他操作。
上述数据链路层地址标识是通常指媒体访问控制地址即 MAC地址。
如图 5所示， 无源光网络中实现线路倒换后快速业务恢复的方法包括： 光网络单元完成从主用线路至备用线路的倒换后， 构造并通过所述备用线路 发送包含所述终端设备的数据链路层地址标识的上行数据包， 交换设备收到 所述上行数据包后通过所述备用线路向所述终端设备下发数据。
交换设备收到所述上行数据包后将所述终端设备的数据链路层地址标识 对应的下行端口修改为所述交换设备上用于连接所述备用线路的端口， 通过 此端口向所述终端设备下发数据。
终端设备的数据链路层地址标识通常是指 MAC地址。
ONU通过备用线路发送上行数据包时， 经过备用 OLT到达交换设备， 备用 OLT从此上行数据包中学习到终端设备的 MAC地址， 也进行此终端设 备的 MAC地址的更新。
实现线路倒换后快速业务恢复的方法中， 可以预设需进行业务恢复保护 的保护对像， 此保护对像可以是终端设备， 也可以通过预设用户网络接口 ( User Network Interface, 简称 UNI )为对象的方式， 进而达到保护归属该接 口下的终端设备的最终目的。
本发明中光网络单元在执行线路保护倒换后及时将终端设备的数据链路 层地址标识通知至交换设备的方式， 使交换设备快速获知终端设备的位置更 新， 及时转换下发下行数据的端口， 将数据通过备用线路下发， 从而使终端 设备的业务得到及时恢复， 将业务恢复的耗时控制在毫秒级， 保证重要业务 的可靠通信。
实施例一 实施例一中设置的保护对像为终端设备。 预设保护对像为终端设备时， 也可以理解为保护对像为数据链路层地址标识， 在无源光网络中， 终端设备 标识与其数据链路层地址标识可视为——对应。 预设需保护的终端设备时， 光网络单元可以设置其管理下的所有终端设备均需保护， 也可以设置部分终 端设备需保护。
实施例一中实现线路倒换后快速业务恢复的方法包括， 光网络单元完成 且属于用户网络接口时， 构造并发送包含所述数据链路层地址标识的上行数 据包。
如 6所示， 具体包括以下步骤：
步骤 601 , 终端设备的业务通过主用线路传递， ONU检测到主用线路故 障或者收到倒换命令后， 完成从主用线路至备用线路的倒换。
步骤 602, ONU判断此终端设备的 MAC地址是否处于活动状态， 如果 是， 执行下一步， 否则不作处理， 结束流程。
步骤 603 , ONU判断此终端设备的 MAC地址是否属于 U I接口， 如果 是， 执行下一步， 否则不作处理， 结束流程。
无源光网络中， U I接口用于下挂终端设备， 上联端口用于汇聚用户流 量并连接到上级设备。 如果此终端设备的 MAC地址属于 U I接口时表示此 MAC地址对应的终端设备在无源光网络中位于 ONU的下级。 如果此终端设 备的 MAC地址属于上联端口时表示此 MAC地址对应的终端设备在无源光网 络中位于 ONU的上级， 此时 ONU不能自行构造包含此 MAC地址的数据包 并从上联口发出， 否则会造成终端设备网络位置的错误更新。
ONU构造的上行数据包中源地址是此终端设备的 MAC地址， 目标地址 是广播地址， 且此上行数据包是无特殊含义的数据包。 上级交换设备如收到 此数据包， 由于此数据包没有特定的操作含义， 因此上级交换设备仅会学习 数据包中指示的源 MAC地址不会做其他操作。
步骤 605 , ONU通过备用线路发送上行数据包。 ONU发送此上行数据包时通过上联端口发出。
此步骤中， 为了防止首次发出的上行数据包因线路不稳定而丟失， ONU 可以在发出上行数据包后启动重定时器， 在重定时器到达设定时间时， ONU 重发此上行数据包。
实施例二
实施例二中设置的保护对像为 U I接口。预设需保护的 U I接口时， 光 网络单元可以设置其管理下的所有 U I接口均需保护， 也可以设置部分 U I 接口需保护。
实施例二中实现线路倒换后快速业务恢复的方法包括， 所述光网络单元 完成线路倒换后， 为预设的用户网络接口下处于活动状态的数据链路层地址 标识构造包含此数据链路层地址标识的上行数据包并发送。
如图 7所示， 具体包括以下步骤：
步骤 701 , 终端设备的业务通过主用线路传递， ONU检测到主用线路故 障或者收到倒换命令后， 完成从主用线路至备用线路的倒换。
步骤 702, ONU判断预设的用户网络接口下是否有处于活动状态的 MAC 地址， 如果是， 执行下一步； 否则， 不作处理， 结束流程。
数据包。
ONU构造的上行数据包中源地址是此 MAC地址，目标地址是广播地址， 且此上行数据包是无特殊含义的数据包。 上级交换设备如收到此数据包， 由 于此数据包没有特定的操作含义， 因此上级交换设备仅会学习数据包中指示 的源 MAC地址不会做其他操作。
步骤 704 , ONU通过备用线路发送上行数据包。
ONU发送此上行数据包时通过上联端口发出。
此步骤中， 为了防止首次发出的上行数据包因线路不稳定而丟失， ONU 可以在发出上行数据包后启动重定时器， 在重定时器到达设定时间时， ONU 重发此上行数据包。
下面结合具体实施例对本发明的进行详细说明。
具体实施例一
参考图 3的网络结构， 保护对像为终端设备时， 实现线路倒换后快速业 务恢复的方法包括：
步骤 S101 , ONU确定需进行业务恢复保护的设备 A的 MAC地址， 在 ONU配置业务保护数据， 将此 MAC地址配置其中。
步骤 S102, ONU不断扫描上联口 1 的状态， 一旦检测到主用线路连接 ( Link ) 1故障或收到倒换命令则立即触发向备用线路 Link2的倒换。
步骤 S103 ,线路倒换完成后， ONU判断保护设备 A的 MAC地址的当前 状态。
步骤 S104, 如该 MAC未处于活动状态， 则不做任何操作。
步骤 S105, 如该 MAC处于活动状态， 继续判断该 MAC地址是否属于 ONU的 U I接口， 如果不是， 执行步骤 S106; 如果是， 执行步骤 S107。
步骤 S106, MAC地址不属于 U I接口而是属于上联端口时， 不做任何 操作， 结束流程。
步骤 S107, MAC地址属于 U I接口， 则 ONU 自行构造一个源地址为 此 MAC, 目标地址为广播地址 ff:ff:ff:ff:ff:ff, 操作码全 0的 U KOWN ARP 数据包。
步骤 S108, ONU将构造好的数据包从倒换后的上联端口 2沿备用线路 Iink2发出。
步骤 S109, 为防止首次发出的数据包因线路不稳定丟失， ONU发出首 个数据包后启动重发定时器。
步骤 S110, 重发定时器时间到， ONU重发此数据包。
当预设的需要进行业务恢复保护的终端设备有多个时， 对于每一个终端 设备的处理步骤与上述步骤是一致的。 具体实施例二
参考图 3的网络结构， 保护对像为 U I接口时， 实现线路倒换后快速业 务恢复的方法包括：
步骤 S201 , ONU确定需要进行业务恢复保护的 U I接口， ONU配置业 务保护数据， 将此接口配置其中。
步骤 S202, ONU不断扫描上联口 1的状态， 一旦检测到主用线路 Linkl 故障或收到倒换命令则立即触发向备用线路 Link2的倒换。
步骤 S203 , 线路倒换完成后， ONU判断预配置的需保护的 U I接口下 有是否有处于活动状态的 MAC地址， 如果有， 执行步骤 S205; 如果没有， 执行步骤 S204。
步骤 S204, 如果没有处于活动状态的 MAC地址， 则不作任何操作， 结 束流程。
步骤 S205, 对于处于活动状态的 MAC地址， ONU逐一自行构造一个源 地址为此 MAC , 目标地址为广播地址 ff:ff:ff:ff:ff:ff ,操作码全 0的 UNKOWN ARP数据包。
步骤 S206, ONU将构造好的数据包从倒换后的上联端口 2沿备用线路 Iink2发出。
步骤 S207, 为防止首次发出的数据包因线路不稳定丟失， ONU发出首 个数据包后启动重发定时器。
步骤 S208, 重发定时器时间到， ONU重发此数据包。
当预设的需要进行业务恢复保护的 U I接口有多个时， 对于每一个 U I 接口下终端设备的处理步骤与上述步骤是一致的。
当然， 本发明还可有其他多种实施例， 在不背离本发明精神及其实质的 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。 工业实用性 本发明中在执行线路保护倒换后及时将终端设备的数据链路层地址标识 通知至交换设备的方式， 使交换设备快速获知终端设备的位置更新， 及时转 换下发下行数据的端口， 将数据通过备用线路下发， 从而使终端设备的业务 得到及时恢复， 将业务恢复的耗时控制在毫秒级， 保证重要业务的可靠通信。 另外， 此方法实现简单仅对 ONU进行改进， 不需要对 OLT、 汇聚交换机等 设备进行任何改造。

Claims

权 利 要 求 书
1、 无源光网络中实现线路倒换后业务恢复的方法， 所述方法包括： 光网络单元完成从主用线路至备用线路的倒换后， 构造并通过所述备用 线路发送包含所述终端设备的数据链路层地址标识的上行数据包， 交换设备 收到所述上行数据包后通过所述备用线路向所述终端设备下发数据。
2、 如权利要求 1所述的方法， 其中，
所述交换设备收到所述上行数据包后通过所述备用线路向所述终端设备 口修改为所述交换设备上用于连接所述备用线路的端口， 通过所述交换设备 上用于连接所述备用线路的端口向所述终端设备下发数据。
3、 如权利要求 1所述的方法， 其中，
所述终端设备是所述光网络单元预设的需进行业务恢复保护的终端设 备；
所述光网络单元完成从主用线路至备用线路的倒换后， 所述构造并发送 且属于用户网络接口时， 构造并发送包含所述数据链路层地址标识的上行数 据包。
4、 如权利要求 1所述的方法， 其中，
所述光网络单元完成从主用线路至备用线路的倒换后， 所述构造并发送 的步骤包括： 为预设的用户网络接口下处于活动状态的数据链路层地址标识 构造包含所述数据链路层地址标识的上行数据包并发送。
5、 如权利要求 1、 2、 3或 4所述的方法， 其中，
所述上行数据包是广播类型数据包， 源地址为所述终端设备的数据链路 层地址标识， 目标地址为广播地址。
6、 如权利要求 1、 2、 3或 4所述的方法， 其中，
所述数据链路层地址标识是媒体访问控制地址。
7、无源光网络中实现线路倒换后业务恢复的系统， 所述系统包括光网络 单元和交换设备；
所述光网络单元设置为： 完成从主用线路至备用线路的倒换后， 构造并 通过所述备用线路发送包含终端设备的数据链路层地址标识的上行数据包； 所述交换设备设置为： 收到所述上行数据包后通过所述备用线路向所述 终端设备下发数据。
8、 如权利要求 7所述的系统， 其中，
所述交换设备是设置为： 在收到所述上行数据包后将所述终端设备的数 据链路层地址标识对应的下行端口修改为所述交换设备上用于连接所述备用 线路的端口， 通过所述连接所述备用线路的端口向所述终端设备下发数据。
9、 如权利要求 7或 8所述的系统， 其中，
所述光网络单元包括业务恢复处理判断模块、 通知模块；
所述业务恢复处理判断模块设置为：在所述光网络单元完成线路倒换后， 络接口时， 向所述通知模块发送触发消息；
所述通知模块设置为：在收到所述业务恢复处理判断模块的触发消息后， 构造并发送包含所述数据链路层地址标识的上行数据包；
其中所述终端设备是所述光网络单元预设的需进行业务恢复保护的终端 设备。
10、 如权利要求 7或 8所述的系统， 其中，
所述光网络单元包括业务恢复处理判断模块、 通知模块；
所述业务恢复处理判断模块设置为：在所述光网络单元完成线路倒换后， 判断预设的用户网络接口下包含处于活动状态的数据链路层地址标识时， 向 所述通知模块发送触发消息；
所述通知模块设置为：在收到所述业务恢复处理判断模块的触发消息后， 据链路层地址标识的上行数据包并发送。
11、 无源光网络中实现线路倒换后业务恢复的光网络单元， 所述光网络 单元设置为： 完成从主用线路至备用线路的倒换后， 构造并通过所述备用线 路向交换设备发送包含终端设备的数据链路层地址标识的上行数据包；
使所述交换设备收到所述上行数据包后通过所述备用线路向终端设备下 发数据。
12、如权利要求 11所述的光网络单元， 所述光网络单元包括业务恢复处 理判断模块、 通知模块；
所述业务恢复处理判断模块设置为：在所述光网络单元完成线路倒换后， 络接口时， 向所述通知模块发送触发消息；
所述通知模块设置为：在收到所述业务恢复处理判断模块的触发消息后， 构造并发送包含所述数据链路层地址标识的上行数据包。
13、如权利要求 11所述的光网络单元， 所述光网络单元包括业务恢复处 理判断模块、 通知模块；
所述业务恢复处理判断模块设置为：在所述光网络单元完成线路倒换后， 判断预设的用户网络接口下包含处于活动状态的数据链路层地址标识时， 向 所述通知模块发送触发消息；
所述通知模块设置为：在收到所述业务恢复处理判断模块的触发消息后， 为预设的用户网络接口
据链路层地址标识的上行数据包并发送。
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