WO2009070943A1 - Procédé de traitement de défauts, système et dispositif d'échange basés sur un réseau ethernet industriel - Google Patents

Procédé de traitement de défauts, système et dispositif d'échange basés sur un réseau ethernet industriel Download PDF

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Publication number
WO2009070943A1
WO2009070943A1 PCT/CN2007/071280 CN2007071280W WO2009070943A1 WO 2009070943 A1 WO2009070943 A1 WO 2009070943A1 CN 2007071280 W CN2007071280 W CN 2007071280W WO 2009070943 A1 WO2009070943 A1 WO 2009070943A1
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WO
WIPO (PCT)
Prior art keywords
state
link
port
working
standby
Prior art date
Application number
PCT/CN2007/071280
Other languages
English (en)
French (fr)
Inventor
Dongqin Feng
Jian Chu
Han Zhang
Jianxiang Jin
Original Assignee
Supcon Group Co., Ltd.
Zhejiang University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Supcon Group Co., Ltd., Zhejiang University filed Critical Supcon Group Co., Ltd.
Priority to US12/744,296 priority Critical patent/US8488475B2/en
Priority to KR1020107014048A priority patent/KR101204130B1/ko
Priority to EP07846106.8A priority patent/EP2216938B1/en
Priority to JP2010534341A priority patent/JP5140735B2/ja
Publication of WO2009070943A1 publication Critical patent/WO2009070943A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
    • H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H04L12/437—Ring fault isolation or reconfiguration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0686—Additional information in the notification, e.g. enhancement of specific meta-data

Definitions

  • the present invention relates to the field of industrial Ethernet technologies, and in particular, to an industrial Ethernet based fault processing method, system, and a switching device.
  • Ethernet With the development of Ethernet technology, Ethernet has been increasingly used in industrial applications, but the stable operation and improved efficiency in the industrial production process have higher requirements for the availability of Industrial Ethernet in the event of a fault.
  • the existing industrial Ethernet generally adopts a master-slave ring network redundancy implementation mechanism, which controls the operation of the entire network through the main switching device in the Ethernet system, so that in the Ethernet When a switching device fails, the availability of the entire network is guaranteed.
  • the above-mentioned master-slave ring redundancy implementation mechanism highly concentrates the fault risk in the network on the primary switching device, resulting in the entire Ethernet network being unavailable in the event of a failure of the primary switching device.
  • Step 101 Configure all the switches in the system.
  • Step 102 Perform periodic loop detection and coordination on the system according to the predetermined configuration indication.
  • Step 103 Send a fault alarm message when a loop fault or protocol machine fault is detected.
  • the method implements distributed fault detection and diagnosis, it embodies the fairness principle of Ethernet communication, and solves the problem of high concentration of Ethernet availability risk caused by failure of the main switching device. .
  • the distributed single-ring redundant network can only handle the failure of the single switching device, and thus still cause the Ethernet system to be unavailable;
  • the path of packet transmission between switching devices changes. Therefore, it needs to be reconstructed during the fault recovery process.
  • the FDB table inherent in the switching device thus extends the time for Ethernet network failure recovery and correspondingly reduces the availability of the Ethernet system.
  • Another object of the present invention is to provide an industrial Ethernet-based fault handling system and a switching device to solve the problem that the system is not available when multiple switching devices in the Ethernet system fail in the prior art.
  • the present invention provides the following technical solutions:
  • An industrial Ethernet-based fault processing method in which a switching device in a network is connected through redundant double-links, wherein a working link is in a working state, and a standby link is in a standby state, including: detecting a switching device between the networks The connection situation of the dual link;
  • the standby link is switched to the working link when the working link is in a failed state and the standby link is in a connected state.
  • connection status of the link includes: the link is in a connected state, the link is in a fault state, or the link is in a disconnected state;
  • the switching device includes at least four ports, and is connected to the adjacent switching device of the switching device through two ports, and the two ports on the same link are the same ring port, and the switching device is The two ports connected to the same switching device are the same port.
  • the switching device searches for the same port of the faulty port that causes the working link to be in a fault state; when the standby link where the same port is located is in the connected state, the working port state on the working link is changed to the disabled state, and the standby port is used.
  • the alternate port state on the link changes to the original state of the working port.
  • the converting the status of the standby port on the standby link to the original state of the working port includes: the original state of the working port is a forwarding state, and the standby port state is changed to a forwarding state; or the original state of the working port is In the congestion state, the standby port state is changed to a congestion state. Further includes:
  • the switching device When the dual link fails, or the working link is in a fault state and the standby link is disconnected In the state, the switching device maintains the state of the standby port on the standby link, and changes the state of the failed port to a congested state;
  • the port state on the dual link is set according to a pre-configuration, and clock synchronization is performed.
  • the switching device sends the alarm information in a multicast manner when the working link fails, and the alarm information includes the fault type information and the location information of the fault occurrence.
  • An industrial Ethernet-based fault processing system comprising: a plurality of switching devices, wherein the switching devices are connected by mutually redundant dual links, wherein the working link is in an active state, and the standby link is in a standby state, the switching Equipment includes:
  • a detecting unit configured to detect a connection condition of the dual link with the adjacent switching device; and switch the standby link to the working link.
  • the switching unit includes:
  • a search unit configured to search for a same port of the faulty port that causes the working link to be in a fault state
  • an operating unit configured to: when the standby link where the same port is located is in a connected state, the working port on the working link The state is changed to the disabled state, and the alternate port state on the standby link is changed to the original state of the working port.
  • the switching device further includes:
  • a conversion unit configured to maintain a state of the standby port on the standby link when the dual link fails, or the working link is in a fault state, and the standby link is in an open state, and the status of the faulty port is Switch to a congested state;
  • the notification unit is configured to notify the working port in the network that is in a congested state to be in a forwarding state.
  • the switching device further includes:
  • a setting unit used for switching devices in the network, when setting, setting a port state on the dual link according to a pre-configuration, and performing clock synchronization
  • An alarm unit configured to send an alarm message in a multicast manner when a working link fails, the report
  • the alarm information includes fault type information and location information of the fault occurrence.
  • a switching device including:
  • a detecting unit configured to detect a connection situation of the dual link with the connected switching device; and switch the standby link to the working link.
  • the switching unit includes:
  • a search unit configured to search for a same port of the faulty port that causes the working link to be in a fault state
  • an operating unit configured to: when the standby link where the same port is located is in a connected state, the working port on the working link The state is changed to the disabled state, and the alternate port state on the standby link is changed to the original state of the working port.
  • a conversion unit configured to maintain a state of the standby port on the standby link when the dual link fails, or the working link is in a fault state, and the standby link is in an open state, and the status of the faulty port is Switch to a congested state;
  • the notification unit is configured to notify the working port in the network that is in a congested state to be in a forwarding state. Further includes:
  • a setting unit used for switching devices in the network, when setting, setting a port state on the dual link according to a pre-configuration, and performing clock synchronization
  • the alarm unit is configured to send the alarm information in a multicast manner when the working link is faulty, where the alarm information includes the fault type information and the location information of the fault occurrence.
  • the switching device in the network of the present invention is connected through mutually redundant dual links, wherein the working link is in a working state, the standby link is in a standby state, and the switching device in the network is detected.
  • the standby link is switched to the working link.
  • the mutually redundant dual-link ring structure applying the present invention can ensure the availability of the network by switching to the standby link when there is a multi-point failure in the network; and avoiding switching between mutually redundant links.
  • the normal data transmission caused by the redirection requires time for redirection, which shortens the failure recovery time in the network.
  • DRAWINGS 1 is a flow chart of a fault processing method in the prior art
  • FIG. 2 is a flow chart of a first embodiment of a method for processing a fault based on an industrial Ethernet according to the present invention
  • FIG. 3 is a schematic diagram of a state of a port connected to a dual link between switching devices
  • FIG. 4 is a schematic diagram of port connections between two switching devices according to the present invention.
  • FIG. 5 is a flow chart of a second embodiment of a fault processing method based on an industrial Ethernet according to the present invention
  • FIG. 6 is a flow chart of a third embodiment of a fault processing method based on an industrial Ethernet according to the present invention
  • FIG. 8 is a schematic structural diagram of a fault processing system based on an industrial Ethernet according to the present invention
  • Figure 9 is a block diagram of a first embodiment of a switching device of the present invention.
  • Figure 10 is a block diagram of a second embodiment of a switching device of the present invention.
  • the core of the present invention is to provide a fault processing method based on industrial Ethernet.
  • the switching devices in the network are connected through mutually redundant dual links, wherein the working link is in working state, the standby link is in standby state, and the detecting network is in the detecting network.
  • FIG. 2 The flow of the first embodiment of the industrial Ethernet based fault processing method is shown in FIG. 2.
  • the switching device in the industrial Ethernet is connected through redundant double links, wherein the working link is in working state, and the standby chain
  • the road is in standby:
  • Step 201 Detect the connection status of the dual link between the switching devices in the network.
  • the link connection status includes the link being in the connected state, the link being in the fault state, or the link being in the disconnected state.
  • the port on the link in the connected state defines that the link is normal according to the IEEE802.3 protocol, and the port can perform normal data interaction with the adjacent switching device; the port on the disconnected link is according to IEEE802.3.
  • the protocol defines the link connection failure and cannot perform any data interaction through the port.
  • the port on the link in the fault state is defined according to the IEEE802.3 protocol.
  • the link is normal, but the adjacent switch device fails. This port interacts with neighboring switching devices for data.
  • Each of the switching devices in the network includes at least four ports, and is connected to the adjacent switching device of the switching device through two ports, and the two ports on the same link are the same ring port. The two ports connected to the same switching device are the same port.
  • Step 202 When the working link is in a fault state and the standby link is in a connected state, the standby link is switched to the working link.
  • the switching device searches for the same port of the faulty port that causes the working link to be in a fault state.
  • the working port state on the working link is disabled.
  • the alternate port state on the alternate link is changed to the original state of the working port.
  • the standby port state is changed to the forwarding state.
  • the standby port state is changed to the congestion state.
  • FIG. 3 A schematic diagram of the state of a port connected to a dual link structure between switching devices in the Ethernet of the present invention is shown in FIG. 3:
  • FIG. 3 shows a switching device A, a switching device, a switching device, a switching device, a switching device E, and a switching device F, which are connected to each other by a dual link in an industrial Ethernet.
  • the same ring port on the inner ring link is in the disabled state; the same ring port on the outer ring link of the other five switching devices except the switching device D is in the forwarding state, and the outer ring link of the switching device D is Two ports, one set to the forwarding state and the other set to the congestion state. Therefore, this setting does not form a loopback in the network, effectively preventing network storms, and all ports in the corresponding inner ring link are disabled. Both are alternate ports, making the inner loop link an alternate link as the outer loop link of the working link.
  • all the ports on one ring are set to the disabled state according to the pre-configuration during the initialization, and one of the ports on the other ring is set to In the congestion state, the remaining ports are set to the forwarding state.
  • the switching device port in the initial state performs clock synchronization and the configuration function of the device; the switching device port in the forwarding state forwards all data packets passing through the port; the switching device port in the congested state only transmits between the switching devices.
  • the probe request packet and the link probe response packet are connected, and all other data packets are discarded.
  • the switch device port in the disabled state discards all data packets.
  • FIG. 4 A schematic diagram of the port connection between the two switching devices in the present invention is shown in FIG. 4:
  • the two switching devices are connected to each other through two pairs of mutually redundant ports.
  • One pair of interconnected ports is a working port, and the other pair of interconnected ports are alternate ports.
  • the working port status in the same port on each switching device is the forwarding state or the congestion state, and the standby port in the same port is disabled.
  • the port in the forwarding state will forward all the data of the port; the port in the congested state will only send the connection probe request message and the connection probe response between the two switching devices, and all other data are discarded. Ports that are disabled are not forwarding any data.
  • the switching device switches the working port, so that the switching device can maintain normal data communication when the working link fails.
  • FIG. 5 The flow of the second embodiment of the fault processing method based on the industrial Ethernet of the present invention is shown in FIG. 5, which is combined with the dual-link structure diagram of the switching device shown in FIG. 3, which shows that only the working link fails in the network. , and the fault handling process when the standby link is in the connected state:
  • Step 501 Detect a connection condition of a dual link between network devices.
  • the switching device in the industrial Ethernet of the present invention uses a pair of independent co-directional ports to perform redundant connection with another adjacent switching device, wherein one port is a working port and the other port is a backup port, and all switching devices are connected end to end. Form a double link ring structure.
  • the working link is faulty, and the port on the link defines that the link is connected according to the IEEE802.3 protocol.
  • the adjacent device fails, data interaction with the adjacent switching device cannot be performed through the port.
  • the standby link is in the connected state, and the port on the link defines that the link is normal according to the IEEE802.3 protocol, and the port can implement normal data interaction with the adjacent switching device.
  • Step 502 Determine whether the working link is in a fault state. If yes, go to step 503; otherwise, go to step 505.
  • Step 503 The switching device searches for the same port of the faulty port that causes the working link to be in a fault state.
  • Step 504 The state of the working port on the working link is changed to the disabled state, and the state of the standby port on the standby link is changed to the original state of the working port, and the current process is terminated.
  • Step 505 Maintain the working state of the working link and the state setting of the port on the working link, and end the current process.
  • FIG. 6 The flow of the third embodiment of the fault processing method based on the industrial Ethernet of the present invention is as shown in FIG. 6 , which is combined with the schematic diagram of the dual link structure of the switching device shown in FIG. 3 , which shows the failure of the working link in the network.
  • Step 601 Detect the connection status of the dual link between the network devices.
  • the link When the standby link is in the connected state, the link is connected normally.
  • the port can implement normal data interaction with the adjacent switching device.
  • the standby link When the standby link is in the disconnected state, the link is faulty and cannot pass the port and other ports.
  • the switching device performs any data interaction.
  • the standby link When the standby link is in the fault state, the link is connected normally. However, because the adjacent switching device fails, data interaction with the adjacent switching device cannot be performed through the port.
  • Step 602 Determine the status of the standby link when the working link is faulty. If it is the connected state, go to step 603. If it is the disconnected or faulted state, go to step 604.
  • Step 603 Switch the standby link to the working link, and end the current process.
  • the switching device searches for the same port of the faulty port that causes the working link to be in a fault state.
  • the standby link where the same port is located is in the connected state
  • the working port state on the working link is disabled to the standby chain.
  • the status of the standby port on the road is changed to the original state of the working port. That is, when the original state of the working port is the forwarding state, the standby port state is changed to the forwarding state.
  • the standby port state is changed to Congested state.
  • Step 604 Maintain the state of the standby port on the standby link, and change the state of the failed port to a congested state.
  • the switching device in the network restores the working status of the link through the connection recovery technology. That is, the switching device continuously detects whether the port connection status is normal. When the switching device is detected. A port in the same port is connected normally. The switching device directly sets the port to the forwarding state. Otherwise, the detection continues. When the other port in the same port of the switching device is detected to be connected, the switching device sets the port. To disable the state.
  • Step 605 Notifying the working port in the network that is in a congested state to go to the forwarding state, and ending the current process.
  • FIG. 3 is a schematic diagram of a dual-link structure of a switching device shown in FIG. 3, which shows a detailed process of the industrial Ethernet-based fault processing method of the present invention:
  • Step 701 When the switching device is initialized, the port state on the dual link is set according to the pre-configuration, and clock synchronization is performed.
  • Step 702 Detect a connection condition of the dual link between switching devices in the network.
  • Step 703 Determine whether the working link is faulty. If yes, go to step 704; otherwise, go to step 710.
  • Step 704 The switching device multicasts the alarm information including the fault type information and the location information of the fault occurrence.
  • Step 705 Determine the status of the standby link. If it is the connected state, go to step 706. If it is the fault or disconnected state, go to step 708.
  • Step 706 The switching device searches for the same end of the faulty port that causes the working link to be in a fault state.
  • Step 707 The state of the working port on the working link is changed to the disabled state, and the state of the standby port on the standby link is changed to the original state of the working port, and the current process is terminated.
  • Step 708 Maintain the state of the standby port on the standby link, and change the state of the failed port to a congested state.
  • Step 709 Notifying the working port in the network that is in a congested state to go to the forwarding state, and ending the current process.
  • Step 710 Maintain the working state of the working link and the state setting of the port on the working link, and end the current process.
  • the present invention also provides an industrial Ethernet based fault handling system.
  • FIG. 8 A schematic diagram of the structure of the fault processing system based on the industrial Ethernet of the present invention is shown in FIG. 8.
  • four switching devices are shown in the schematic diagram, namely, the switching device 810, the switching device 820, the switching device 830, and the switching device 840.
  • the four switching devices are connected by mutually redundant double links, the outer ring is a working link in an active state, and the inner ring is a standby link in a standby state.
  • Each switching device in the system includes a detecting unit for detecting between the adjacent switching devices A connection unit of the dual link; the switching unit is configured to switch the standby link to the working link when the working link is in a fault state and the standby link is in a connected state.
  • the switching unit further includes a searching unit, configured to search for a co-directional port of the faulty port that causes the working link to be in a fault state, and an operating unit configured to work when the standby link where the same-direction port is in the connected state The working port status on the link is changed to the disabled state, and the standby port status on the standby link is changed to the original state of the working port.
  • the switching device may further include a converting unit, configured to maintain the standby port on the standby link when the dual link fails, or the working link is in a fault state and the standby link is in the disconnected state. Status, and the status of the faulty port is changed to the congestion state; the notification unit is configured to notify the working port in the network that the congestion state is in the forwarding state; the setting unit is used for the switching device in the network during initialization, according to the pre-configuration Setting a port state on the dual link and performing clock synchronization; an alarm unit, configured to send alarm information in a multicast manner when the working link fails, where the alarm information includes fault type information and the fault Location information that occurred.
  • a converting unit configured to maintain the standby port on the standby link when the dual link fails, or the working link is in a fault state and the standby link is in the disconnected state. Status, and the status of the faulty port is changed to the congestion state; the notification unit is configured to notify the working port in the network that the congestion state is in the forwarding state
  • the present invention also provides a switching device.
  • FIG. 9 A block diagram of a first embodiment of the switching device of the present invention is shown in Figure 9:
  • the switching device includes: a detecting unit 910 and a switching unit 920.
  • the detecting unit 910 is configured to detect a connection situation of the dual link with the connected switching device; and switch the standby link to the working link.
  • a block diagram of a second embodiment of the switching device of the present invention is shown as 10:
  • the switching device includes: a setting unit 1010, a detecting unit 1020, a switching unit 1030, a converting unit 1040, a notifying unit 1050, and an alarm unit 1060.
  • the setting unit 1010 is configured to: when the switching device in the network initializes, set the port state on the dual link according to the pre-configuration, and perform clock synchronization; the detecting unit 1020 is configured to detect the double between the connected device and the connected device.
  • the connection unit 1030 is configured to switch the standby link to the working link when the working link is in a fault state and the standby link is in a connected state; the converting unit 1040 is configured to use the dual The link is faulty, or the working link is in a fault state and the standby link is in the disconnected state, maintaining the state of the standby port on the standby link, and the faulty port is The state is changed to a congestion state; the notification unit 1050 is configured to notify the working port in the network that the congestion state is in the forwarding state; the alarm unit 1060 is configured to send the alarm information in a multicast manner when the working link fails, where the alarm information is The fault type information and the location information of the fault occurrence are included.
  • the switching unit 1030 includes a searching unit 1031 for searching for a peer port of the faulty port that causes the working link to be in a fault state, and an operating unit 1032, configured to: when the standby link where the same port is located is in a connected state, The working port state on the working link is changed to the disabled state, and the standby port state on the standby link is changed to the original state of the working port.
  • the mutually redundant dual-link ring structure applying the present invention can ensure the availability of the network by switching to the standby link when multiple faults occur in the network; and through mutually redundant chains.
  • the switching between the roads avoids the need for redirection of normal data transmission due to the change of the data transmission path during the redundancy switching process under the structure of the single ring network, and shortens the fault recovery time in the network.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Small-Scale Networks (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)

Description

基于工业以太网的故障处理方法、 系统及一种交换设备 本申请要求于 2007 年 11 月 26 日提交中国专利局、 申请号为 200710167374.2、 发明名称为"基于工业以太网的故障处理方法、 系统及一种 交换设备"的中国专利申请的优先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及工业以太网技术领域，特别涉及基于工业以太网的故障处理方 法、 系统及一种交换设备。
背景技术
随着以太网技术的发展， 以太网已经越来越多地应用于工业场合，但是工 业生产过程中的稳定运行和效益提高对工业以太网的在故障情况下的可用性 有了更高的要求。针对工业以太网的高可用性要求，现有工业以太网普遍采用 主从式的环网冗余实现机制 ,该机制通过以太网系统中的主交换设备控制整个 网络的工作情况， 以使以太网中的某一交换设备发生故障时，保证整个网络的 可用性。 但是， 上述主从式的环形冗余实现机制， 将网络中的故障风险高度集 中在了主交换设备上，导致在主交换设备发生故障的情况下，整个以太网络不 可用。
现有技术中为了克服主从式的环网冗余实现机制在主交换设备发生故障 时网络不可用的问题， 采用了分布式以太网系统，该系统包括依次相连组成环 形结构的多个交换机， 该系统在进行故障处理时的流程如图 1所示：
步骤 101 : 对系统中的所有交换机进行组态。
步骤 102: 按照预先确定的组态指示， 对系统进行周期性的环路检测和协 步骤 103: 当检测到环路故障或协议机故障时发送故障报警报文。
由上述现有以太网故障处理方法可知，虽然该方法实现了分布式的故障检 测和诊断，体现了以太网通信的公平原则，解决了由于主交换设备故障造成的 以太网可用性风险高度集中的问题。但是， 当网络中的多台交换设备出现多个 故障的情况下，由于该分布式单环形冗余网络仅能处理单一交换设备发生的故 障， 因此仍会导致以太网系统的不可用； 并且在网络中出现单一故障时， 由于 交换设备之间报文传输的路径发生了改变， 因此，在故障恢复过程中需要重建 交换设备中固有的 FDB表， 因此延长了以太网络故障恢复的时间， 相应也降 低了以太网系统的可用性。
发明内容
本发明的目的在于提供一种基于工业以太网的故障处理方法，以解决现有 技术中当多台交换设备出现多个故障时导致以太网系统不可用的问题。
本发明的另一目的在于提供一种基于工业以太网的故障处理系统和一种 交换设备，以解决现有技术中以太网系统内多台交换设备出现故障时导致系统 不可用的问题。
为解决上述技术问题， 本发明提供如下技术方案：
一种基于工业以太网的故障处理方法，网络中的交换设备通过互相冗余的 双链路连接， 其中工作链路处于工作状态， 备用链路处于备用状态， 包括： 检测网络中交换设备间的所述双链路的连接情况；
当所述工作链路处于故障状态且备用链路处于连接状态时 ,将所述备用链 路切换至工作链路。
所述链路的连接情况包括：链路处于连接状态、链路处于故障状态或链路 处于断开状态；
所述交换设备至少包括四个端口，并分别通过两个端口与该交换设备的相 邻交换设备相连，所述交换设备处于同一链路上的两个端口为同环端口， 所述 交换设备与同一交换设备相连的两个端口为同向端口。
按照下述步骤， 将所述备用链路切换至工作链路：
交换设备查找使工作链路处于故障状态的故障端口的同向端口； 当所述同向端口所在的备用链路处于连接状态时，将工作链路上的工作端 口状态转为禁用状态 ,将备用链路上的备用端口状态转为所述工作端口的原状 态。
所述将备用链路上的备用端口状态转为工作端口的原状态包括： 所述工作端口的原状态为转发状态，所述备用端口状态转为转发状态； 或 所述工作端口的原状态为拥塞状态， 所述备用端口状态转为拥塞状态。 进一步包括：
当所述双链路均出现故障 ,或工作链路处于故障状态且备用链路处于断开 状态时， 所述交换设备保持所述备用链路上备用端口的状态， 并将故障端口的 状态转为拥塞状态；
通知网络中处于拥塞状态的工作端口转为转发状态。
进一步包括：
网络中的交换设备在初始化时，根据预先组态设定所述双链路上的端口状 态， 并进行时钟同步。
进一步包括：
所述交换设备在工作链路出现故障时以组播方式发送报警信息，所述报警 信息中包括故障类型信息和所述故障发生的位置信息。
一种基于工业以太网的故障处理系统， 包括： 多个交换设备， 所述交换设 备通过互相冗余的双链路连接，其中工作链路处于工作状态，备用链路处于备 用状态， 所述交换设备包括：
检测单元， 用于检测与相邻交换设备间的双链路的连接情况； 时， 将所述备用链路切换至工作链路。
所述切换单元包括：
查找单元， 用于查找使工作链路处于故障状态的故障端口的同向端口； 操作单元， 用于当所述同向端口所在的备用链路处于连接状态时，将工作 链路上的工作端口状态转为禁用状态 ,将备用链路上的备用端口状态转为所述 工作端口的原状态。
所述交换设备进一步包括：
转换单元， 用于当所述双链路均出现故障，或工作链路处于故障状态且备 用链路处于断开状态时，保持所述备用链路上备用端口的状态， 并将故障端口 的状态转为拥塞状态；
通知单元， 用于通知网络中处于拥塞状态的工作端口转为转发状态。 所述交换设备进一步包括：
设置单元， 用于网络中的交换设备在初始化时，根据预先组态设定所述双 链路上的端口状态， 并进行时钟同步；
报警单元， 用于在工作链路出现故障时以组播方式发送报警信息， 所述报 警信息中包括故障类型信息和所述故障发生的位置信息。
一种交换设备， 包括：
检测单元， 用于检测与相连交换设备间的双链路的连接情况； 时， 将所述备用链路切换至工作链路。
所述切换单元包括：
查找单元， 用于查找使工作链路处于故障状态的故障端口的同向端口； 操作单元， 用于当所述同向端口所在的备用链路处于连接状态时，将工作 链路上的工作端口状态转为禁用状态 ,将备用链路上的备用端口状态转为所述 工作端口的原状态。
进一步包括：
转换单元， 用于当所述双链路均出现故障，或工作链路处于故障状态且备 用链路处于断开状态时，保持所述备用链路上备用端口的状态， 并将故障端口 的状态转为拥塞状态；
通知单元， 用于通知网络中处于拥塞状态的工作端口转为转发状态。 进一步包括：
设置单元， 用于网络中的交换设备在初始化时，根据预先组态设定所述双 链路上的端口状态， 并进行时钟同步；
报警单元， 用于在工作链路出现故障时以组播方式发送报警信息， 所述报 警信息中包括故障类型信息和所述故障发生的位置信息。
由以上本发明提供的技术方案可见，本发明网络中的交换设备通过互相冗 余的双链路连接， 其中工作链路处于工作状态， 备用链路处于备用状态， 检测 网络中交换设备间的所述双链路的连接情况，当所述工作链路处于故障状态且 备用链路处于连接状态时，将所述备用链路切换至工作链路。应用本发明的互 相冗余的双链路环形结构能够在网络出现多点故障时，通过切换到备用链路以 保证网络的可用性； 并且通过互为冗余的链路之间的切换，避免了在单环网的 结构下， 冗余切换过程中由于数据传输路径的改变， 导致的 ÷的正常数据传输 需要重定向的时间， 缩短了网络中的故障恢复时间。
附图说明 图 1为现有技术中故障处理方法的流程图；
图 2为本发明基于工业以太网的故障处理方法的第一实施例流程图； 图 3为交换设备间连接成双链路的端口状态示意图；
图 4为本发明两台交换设备之间的端口连接示意图；
图 5为本发明基于工业以太网的故障处理方法的第二实施例流程图； 图 6为本发明基于工业以太网的故障处理方法的第三实施例流程图； 图 7为本发明基于工业以太网的故障处理方法的第四实施例流程图； 图 8为本发明基于工业以太网的故障处理系统的结构示意图；
图 9为本发明交换设备的第一实施例框图；
图 10为本发明交换设备的第二实施例框图。
具体实施方式
本发明的核心是提供一种基于工业以太网的故障处理方法，网络中的交换 设备通过互相冗余的双链路连接，其中工作链路处于工作状态，备用链路处于 备用状态，检测网络中交换设备间的所述双链路的连接情况， 当所述工作链路 处于故障状态且备用链路处于连接状态时， 将所述备用链路切换至工作链路。
为了使本技术领域的人员更好地理解本发明方案 , 并使本发明的上述目 的、特征和优点能够更加明显易懂， 下面结合附图和具体实施方式对本发明作 进一步伴细的说明。
本发明基于工业以太网的故障处理方法的第一实施例流程如图 2所示，该 工业以太网中的交换设备通过互相冗余的双链路连接，其中工作链路处于工作 状态， 备用链路处于备用状态：
步骤 201： 检测网络中交换设备间的双链路的连接情况。
其中，链路的连接情况包括链路处于连接状态、链路处于故障状态或链路 处于断开状态。处于连接状态的链路上的端口根据 IEEE802.3协议定义该链路 连接正常，通过该端口能够与相邻交换设备实现正常的数据交互； 处于断开状 态的链路上的端口根据 IEEE802.3协议定义该链路连接故障，无法通过该端口 进行任何数据交互；处于故障状态的链路上的端口根据 IEEE802.3协议定义该 链路连接正常，但是由于相邻交换设备发生故障， 因此无法通过该端口与相邻 交换设备进行数据交互。 其中， 网络中的每个交换设备至少包括四个端口， 并分别通过两个端口与 该交换设备的相邻交换设备相连，所述交换设备处于同一链路上的两个端口为 同环端口， 所述交换设备与同一交换设备相连的两个端口为同向端口。
步骤 202: 当工作链路处于故障状态且备用链路处于连接状态时， 将备用 链路切换至工作链路。
具体的 , 交换设备查找使工作链路处于故障状态的故障端口的同向端口， 当该同向端口所在的备用链路处于连接状态时，将工作链路上的工作端口状态 转为禁用状态，将备用链路上的备用端口状态转为该工作端口的原状态。 当工 作端口的原状态为转发状态时将备用端口状态转为转发状态 ,当工作端口的原 状态为拥塞状态时将备用端口状态转为拥塞状态。
本发明以太网中的交换设备间连接成双链路结构的端口状态示意图如图 3所示：
图 3中示出了工业以太网中，相互之间通过双链路连接成环形的交换设备 A、 交换设备^ 交换设备(、 交换设备。、 交换设备 E和交换设备 F。 其中， 所有设备的内环链路上的同环端口均处于禁用状态； 除交换设备 D之外的其 它五个交换设备的外环链路上的同环端口均处于转发状态， 交换设备 D的外 环链路上的两个端口， 一个设置为转发状态， 另一个设置为拥塞状态。 因此， 这种设置使网络中不会形成回环，有效防止了网络风暴，相应的内环链路上所 有处于禁用状态的端口均为备用端口 ,使得内环链路成为作为工作链路的外环 链路的备用链路。
在本发明以太网双链路结构中， 交换设备间在初始化时根据预先的组态， 将一个环上的所有端口设置为禁用状态，并将另一个环上的所有端口中的一个 端口设置为拥塞状态， 剩余端口均设置为转发状态。 其中， 处于初始化状态的 交换设备端口进行时钟同步以及设备的组态功能；处于转发状态的交换设备端 口将转发所有经过该端口的数据报文；处于拥塞状态的交换设备端口仅发送交 换设备间的连接探测请求报文和链接探测响应报文，而其它所有数据报文均被 丢弃； 处于禁用状态的交换设备端口将所有的数据报文均进行丢弃。
结合上述交换设备间连接成双链路的端口状态示意图，本发明两台交换设 备之间的端口连接示意图如图 4所示： 两台交换设备分别通过两对互为冗余的端口相互连接，其中一对相互连接 的端口为工作端口， 另一对相互连接端口为备用端口。 当两个交换设备之间的 链路没有发生故障时，每个交换设备上的同向端口中的工作端口状态为转发状 态或者拥塞状态， 同向端口中的备用端口为禁用状态。 其中， 处于转发状态的 端口将转发此端口的所有数据；处于拥塞状态的端口将只发送两个交换设备之 间的连接探测请求报文和连接探测响应保温，其它所有数据 文均被丢弃； 处 于禁用状态的端口不转发任何数据。 当处于转发状态的端口检测到连接故障 时， 交换设备通过切换工作端口， 使得交换设备在工作链路出现故障时， 仍能 保持正常的数据通信。
本发明基于工业以太网的故障处理方法的第二实施例流程如图 5所示，结 合如图 3所示的交换设备双链路结构示意图，该实施例示出了网络中仅工作链 路出现故障， 而备用链路处于连接状态时的故障处理流程：
步骤 501 : 检测网络设备间的双链路的连接情况。
本发明工业以太网中的交换设备使用独立的一对同向端口与邻近的另一 台交换设备进行冗余连接，其中一个端口为工作端口，另一个端口为备份端口， 所有的交换设备首尾相连形成双链路的环形结构。
该实施例中， 工作链路出现故障， 该链路上的端口根据 IEEE802.3协议定 义该链路连接正常，但是由于相邻设备发生故障， 因此无法通过该端口与相邻 交换设备进行数据交互； 备用链路处于连接状态， 该链路上的端口根据 IEEE802.3协议定义该链路连接正常， 通过该端口能够与相邻交换设备实现正 常的数据交互。
步骤 502: 判断工作链路是否处于故障状态， 若是， 则执行步骤 503; 否 则， 执行步骤 505。
步骤 503: 交换设备查找使工作链路处于故障状态的故障端口的同向端 口。
步骤 504: 将工作链路上的工作端口状态转为禁用状态， 将备用链路上的 备用端口状态转为所述工作端口的原状态 , 结束当前流程。
当工作端口的原状态为转发状态时，将备用端口状态转为转发状态； 当工 作端口的原状态为拥塞状态时， 将备用端口状态转为拥塞状态。 步骤 505: 保持工作链路的工作状态及该工作链路上端口的状态设置， 结 束当前流程。
本发明基于工业以太网的故障处理方法的第三实施例流程如图 6所示，结 合如图 3所示的交换设备双链路结构示意图，该实施例示出了网络中工作链路 出现故障时， 根据备用链路的状态进行故障处理的流程：
步骤 601 : 检测网络设备间的双链路的连接情况。
备用链路处于连接状态时，该链路连接正常，通过该端口能够与相邻交换 设备实现正常的数据交互； 备用链路处于断开状态时， 该链路连接故障， 无法 通过该端口与其它交换设备进行任何数据交互；备用链路处于故障状态时，该 链路连接正常，但是由于相邻交换设备发生故障， 因此无法通过该端口与相邻 交换设备进行数据交互。
步骤 602: 判断工作链路故障时备用链路的状态， 若为连接状态， 则执行 步骤 603; 若为断开或故障状态， 则执行步骤 604。
步骤 603: 将备用链路切换至工作链路， 结束当前流程。
交换设备查找使工作链路处于故障状态的故障端口的同向端口，当该同向 端口所在的备用链路处于连接状态时，将工作链路上的工作端口状态转为禁用 状态，将备用链路上的备用端口状态转为该工作端口的原状态， 即工作端口的 原状态为转发状态时将备用端口状态转为转发状态，当工作端口的原状态为拥 塞状态时将备用端口状态转为拥塞状态。
步骤 604: 保持备用链路上备用端口的状态， 并将故障端口的状态转为拥 塞状态。
当交换设备同向端口的链路连接状态都为断开状态时，网络中的交换设备 通过连接恢复技术恢复链路的工作状态，即交换设备持续探测端口连接状态是 否正常， 当检测出交换设备同向端口中的一个端口连接正常， 交换设备直接将 该端口设置为转发状态， 否则继续进行探测； 当检测出交换设备同向端口中的 另一个端口也链接正常 , 则交换设备将该端口设置为禁用状态。
步骤 605: 通知网络中处于拥塞状态的工作端口转入转发状态， 结束当前 流程。
本发明基于工业以太网的故障处理方法的第四实施例流程如图 7所示，结 合如图 3所示的交换设备双链路结构示意图，该实施例示出了本发明基于工业 以太网的故障处理方法的详细流程：
步骤 701： 交换设备初始化时根据预先组态设定双链路上的端口状态 , 并 进行时钟同步。
步骤 702: 检测网络中交换设备间的所述双链路的连接情况。
步骤 703: 判断工作链路是否发生故障， 若是， 则执行步骤 704; 否则， 执行步骤 710。
步骤 704: 交换设备以组播方式发送包括故障类型信息和该故障发生的位 置信息的报警信息。
步骤 705: 判断备用链路的状态， 若为连接状态， 则执行步骤 706; 若为 故障或断开状态， 则执行步骤 708。
步骤 706: 交换设备查找使工作链路处于故障状态的故障端口的同向端 。
步骤 707: 将工作链路上的工作端口状态转为禁用状态， 将备用链路上的 备用端口状态转为所述工作端口的原状态， 结束当前流程。
步骤 708: 保持备用链路上备用端口的状态， 并将故障端口的状态转为拥 塞状态。
步骤 709: 通知网络中处于拥塞状态的工作端口转入转发状态， 结束当前 流程。
步骤 710: 保持工作链路的工作状态及该工作链路上端口的状态设置， 结 束当前流程。
与本发明基于工业以太网的故障处理方法相对应 ,本发明还提供了一种基 于工业以太网的故障处理系统。
本发明基于工业以太网的故障处理系统的结构示意图如图 8所示，为了示 例方便， 该示意图中示出了四台交换设备， 即交换设备 810、 交换设备 820、 交换设备 830和交换设备 840。 其中， 所述四台交换设备通过互相冗余的双链 路进行连接， 外环为处于工作状态的工作链路， 内环为处于备用状态的备用链 路。
该系统中的每个交换设备均包括检测单元，用于检测与相邻交换设备间的 双链路的连接情况； 切换单元， 用于当所述工作链路处于故障状态且备用链路 处于连接状态时， 将所述备用链路切换至工作链路。 其中， 切换单元还包括查 找单元，用于查找使工作链路处于故障状态的故障端口的同向端口；操作单元， 用于当所述同向端口所在的备用链路处于连接状态时，将工作链路上的工作端 口状态转为禁用状态，将备用链路上的备用端口状态转为所述工作端口的原状 态。
进一步的 ,交换设备还可以包括转换单元，用于当所述双链路均出现故障 , 或工作链路处于故障状态且备用链路处于断开状态时，保持所述备用链路上备 用端口的状态， 并将故障端口的状态转为拥塞状态； 通知单元， 用于通知网络 中处于拥塞状态的工作端口转为转发状态；设置单元， 用于网络中的交换设备 在初始化时， 根据预先组态设定所述双链路上的端口状态， 并进行时钟同步； 报警单元， 用于在工作链路出现故障时以组播方式发送报警信息， 所述报警信 息中包括故障类型信息和所述故障发生的位置信息。
与本发明基于工业以太网的故障处理方法和系统相对应，本发明还提供了 一种交换设备。
本发明交换设备的第一实施例框图如图 9所示：
该交换设备包括： 检测单元 910和切换单元 920。
其中，检测单元 910用于检测与相连交换设备间的双链路的连接情况； 切 所述备用链路切换至工作链路。
本发明交换设备的第二实施例框图如同 10所示：
该交换设备包括： 设置单元 1010、 检测单元 1020、 切换单元 1030、 转换 单元 1040、 通知单元 1050和报警单元 1060。
其中， 设置单元 1010用于网络中的交换设备在初始化时， 根据预先组态 设定所述双链路上的端口状态， 并进行时钟同步； 检测单元 1020用于检测与 相连交换设备间的双链路的连接情况； 切换单元 1030用于当所述工作链路处 于故障状态且备用链路处于连接状态时，将所述备用链路切换至工作链路； 转 换单元 1040用于当所述双链路均出现故障 , 或工作链路处于故障状态且备用 链路处于断开状态时，保持所述备用链路上备用端口的状态， 并将故障端口的 状态转为拥塞状态； 通知单元 1050用于通知网络中处于拥塞状态的工作端口 转入转发状态； 报警单元 1060用于在工作链路出现故障时以组播方式发送报 警信息， 所述报警信息中包括故障类型信息和所述故障发生的位置信息。
其中， 切换单元 1030包括查找单元 1031 , 用于查找使工作链路处于故障 状态的故障端口的同向端口； 操作单元 1032， 用于当所述同向端口所在的备 用链路处于连接状态时，将工作链路上的工作端口状态转为禁用状态，将备用 链路上的备用端口状态转为所述工作端口的原状态。
由以上本发明实施例可见，应用本发明的互相冗余的双链路环形结构能够 在网络出现多点故障时，通过切换到备用链路保证了网络的可用性； 并且通过 互为冗余的链路之间的切换，避免了在单环网的结构下， 冗余切换过程中由于 数据传输路径的改变，导致的正常数据传输需要重定向的时间， 缩短了网络中 的故障恢复时间。
虽然通过实施例描绘了本发明，本领域普通技术人员知道，本发明有许多 变形和变化而不脱离本发明的精神，希望所附的权利要求包括这些变形和变化 而不脱离本发明的精神。

Claims

权 利 要 求
1、 一种基于工业以太网的故障处理方法， 其特征在于， 网络中的交换设 备通过互相冗余的双链路连接，其中工作链路处于工作状态，备用链路处于备 用状态， 包括：
检测网络中交换设备间的所述双链路的连接情况；
当所述工作链路处于故障状态且备用链路处于连接状态时 ,将所述备用链 路切换至工作链路。
2、根据权利要求 1所述的方法， 其特征在于， 所述链路的连接情况包括： 链路处于连接状态、 链路处于故障状态或链路处于断开状态；
所述交换设备至少包括四个端口，并分别通过两个端口与该交换设备的相 邻交换设备相连，所述交换设备处于同一链路上的两个端口为同环端口， 所述 交换设备与同一交换设备相连的两个端口为同向端口。
3、 根据权利要求 2所述的方法， 其特征在于， 按照下述步骤， 将所述备 用链路切换至工作链路：
交换设备查找使工作链路处于故障状态的故障端口的同向端口；
当所述同向端口所在的备用链路处于连接状态时，将工作链路上的工作端 口状态转为禁用状态 ,将备用链路上的备用端口状态转为所述工作端口的原状 态。
4、 根据权利要求 3所述的方法， 其特征在于， 所述将备用链路上的备用 端口状态转为工作端口的原状态包括：
所述工作端口的原状态为转发状态，所述备用端口状态转为转发状态； 或 所述工作端口的原状态为拥塞状态， 所述备用端口状态转为拥塞状态。
5、 根据权利要求 2所述的方法， 其特征在于， 进一步包括：
当所述双链路均出现故障 ,或工作链路处于故障状态且备用链路处于断开 状态时， 所述交换设备保持所述备用链路上备用端口的状态， 并将故障端口的 状态转为拥塞状态；
通知网络中处于拥塞状态的工作端口转为转发状态。
6、 根据权利要求 2所述的方法， 其特征在于， 进一步包括：
网络中的交换设备在初始化时，根据预先组态设定所述双链路上的端口状 态， 并进行时钟同步。
7、根据权利要求 1至 6任意一项所述的方法， 其特征在于， 进一步包括： 所述交换设备在工作链路出现故障时以组播方式发送报警信息，所述报警 信息中包括故障类型信息和所述故障发生的位置信息。
8、 一种基于工业以太网的故障处理系统， 其特征在于， 包括： 多个交换 设备，所述交换设备通过互相冗余的双链路连接，其中工作链路处于工作状态， 备用链路处于备用状态， 所述交换设备包括：
检测单元， 用于检测与相邻交换设备间的双链路的连接情况； 时， 将所述备用链路切换至工作链路。
9、 根据权利要求 8所述的系统， 其特征在于， 所述切换单元包括： 查找单元， 用于查找使工作链路处于故障状态的故障端口的同向端口； 操作单元， 用于当所述同向端口所在的备用链路处于连接状态时，将工作 链路上的工作端口状态转为禁用状态 ,将备用链路上的备用端口状态转为所述 工作端口的原状态。
10、根据权利要求 8所述的系统，其特征在于，所述交换设备进一步包括： 转换单元， 用于当所述双链路均出现故障，或工作链路处于故障状态且备 用链路处于断开状态时，保持所述备用链路上备用端口的状态， 并将故障端口 的状态转为拥塞状态；
通知单元， 用于通知网络中处于拥塞状态的工作端口转为转发状态。
11、根据权利要求 8所述的系统，其特征在于，所述交换设备进一步包括： 设置单元， 用于网络中的交换设备在初始化时，根据预先组态设定所述双 链路上的端口状态， 并进行时钟同步；
报警单元， 用于在工作链路出现故障时以组播方式发送报警信息， 所述报 警信息中包括故障类型信息和所述故障发生的位置信息。
12、 一种交换设备， 其特征在于， 包括：
检测单元， 用于检测与相连交换设备间的双链路的连接情况；
切换单元，
时， 将所述备用链路切换至工作链路。
13、根据权利要求 12所述的交换设备， 其特征在于， 所述切换单元包括： 查找单元， 用于查找使工作链路处于故障状态的故障端口的同向端口； 操作单元， 用于当所述同向端口所在的备用链路处于连接状态时，将工作 链路上的工作端口状态转为禁用状态 ,将备用链路上的备用端口状态转为所述 工作端口的原状态。
14、 根据权利要求 12所述的交换设备， 其特征在于， 进一步包括： 转换单元， 用于当所述双链路均出现故障，或工作链路处于故障状态且备 用链路处于断开状态时，保持所述备用链路上备用端口的状态， 并将故障端口 的状态转为拥塞状态；
通知单元， 用于通知网络中处于拥塞状态的工作端口转为转发状态。
15、 根据权利要求 12所述的交换设备， 其特征在于， 进一步包括： 设置单元， 用于网络中的交换设备在初始化时，根据预先组态设定所述双 链路上的端口状态， 并进行时钟同步；
报警单元， 用于在工作链路出现故障时以组播方式发送报警信息， 所述报 警信息中包括故障类型信息和所述故障发生的位置信息。
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