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CN100466559C - A Method for Judging the Topology Stability of Resilient Packet Ring - Google Patents

A Method for Judging the Topology Stability of Resilient Packet Ring Download PDF

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Publication number
CN100466559C
CN100466559C CNB2005100854101A CN200510085410A CN100466559C CN 100466559 C CN100466559 C CN 100466559C CN B2005100854101 A CNB2005100854101 A CN B2005100854101A CN 200510085410 A CN200510085410 A CN 200510085410A CN 100466559 C CN100466559 C CN 100466559C
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China
Prior art keywords
topology
crc value
stability
changes
alarm
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CNB2005100854101A
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CN1901481A (en
Inventor
郭红健
李振刚
周峰轮
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State Grid Shanghai Electric Power Co Ltd
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ZTE Corp
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Abstract

本发明涉及一种弹性分组环拓扑稳定性的判断方法，更具体地说，是一种以太网交换机设备中判断弹性分组环拓扑稳定性的方法。包括以下处理：拓扑定时模块每隔一定周期向拓扑消息接收处理模块发送拓扑稳定性检测消息，拓扑消息接收处理模块调用拓扑稳定性检测状态机进行处理；计算当前拓扑表的CRC值，与上一周期的CRC值进行比较，以此判断拓扑是否发生变化。采用本发明所述方法，可以有效检测弹性分组环拓扑的稳定性，操作简易，避免维护多个定时器，并且不依赖于对接收的拓扑保护控制帧的分析，而是自发地对本地站点拓扑表进行周期性分析判断，因此对于本地物理链路故障引起的拓扑变化也能够有效检测。

Figure 200510085410

The invention relates to a method for judging the topology stability of an elastic packet ring, more specifically, a method for judging the topology stability of an elastic packet ring in an Ethernet switch device. Including the following processing: the topology timing module sends a topology stability detection message to the topology message receiving and processing module at regular intervals, and the topology message receiving and processing module calls the topology stability detection state machine for processing; calculates the CRC value of the current topology table, and compares it with the previous Periodic CRC values are compared to determine whether the topology has changed. By adopting the method of the present invention, the stability of the elastic packet ring topology can be effectively detected, the operation is simple, the maintenance of multiple timers is avoided, and it does not rely on the analysis of the received topology protection control frame, but spontaneously analyzes the topology of the local site The table performs periodic analysis and judgment, so it can also effectively detect topology changes caused by local physical link failures.

Figure 200510085410

Description

一种判断弹性分组环拓扑稳定性的方法 A Method for Judging the Topology Stability of Resilient Packet Ring

技术领域 technical field

本发明涉及一种RPR(Resilient Packet Ring，弹性分组环)拓扑稳定性的判断方法，更具体地说，是一种以太网交换机设备中判断弹性分组环拓扑稳定性的方法。The invention relates to a method for judging the topology stability of RPR (Resilient Packet Ring), more specifically, a method for judging the topology stability of a resilient packet ring in an Ethernet switch device.

背景技术 Background technique

IEEE标准草案P802.17给出了弹性分组环的使用方法及物理层规范。弹性分组环是一种支持以双环配置互联的站点间数据传输的城域网技术，由于其具有拓扑发现、环路保护、带宽分配等功能特点而在通讯技术领域得到了越来越多的关注和应用。IEEE standard draft P802.17 provides the use method and physical layer specification of RPR. Resilient packet ring is a metropolitan area network technology that supports data transmission between sites interconnected in a double-ring configuration. Due to its functional characteristics such as topology discovery, loop protection, and bandwidth allocation, it has received more and more attention in the field of communication technology. and apply.

弹性分组环有两个方向相反的环路，环上的每个站点周期性地广播慢速拓扑保护控制帧或在检测到拓扑发生变化时广播快速拓扑保护控制帧。环上各站点根据接收到的拓扑保护控制帧来更新各自维护的拓扑表和环选择表，如果环上存在故障点，则在拓扑表中将形成保护边界。The RPR has two loops with opposite directions, and each station on the ring periodically broadcasts slow topology protection control frames or broadcasts fast topology protection control frames when topology changes are detected. Each station on the ring updates its topology table and ring selection table according to the received topology protection control frame. If there is a fault point on the ring, a protection boundary will be formed in the topology table.

正常情况下业务流根据环选择表选择其中的一个环路进行传输，当环上站点或某个环路出现故障时，及时更新的环选择表将引导业务在到达故障点之前自动倒换到可用环路上，实现快速的业务恢复。Under normal circumstances, the service flow selects one of the rings for transmission according to the ring selection table. When a site on the ring or a ring fails, the timely updated ring selection table will guide the service to automatically switch to the available ring before reaching the fault point. On the road, to achieve rapid business recovery.

IEEE标准草案P802.17/D3.3给出了弹性分组环区别于其他网络互联技术的几个关键特征，其中在站点或链路发生故障时业务恢复时间在50ms以下，然而不稳定的拓扑将会导致业务的频繁倒换，极大的影响网络性能，因此拓扑不稳定在IEEE草案P802.17/D3.3中被列为故障之一。IEEE standard draft P802.17/D3.3 provides several key features that distinguish RPR from other network interconnection technologies, in which the service recovery time is less than 50ms when a site or link fails, but unstable topology will It will cause frequent switching of services and greatly affect network performance. Therefore, topology instability is listed as one of the faults in IEEE draft P802.17/D3.3.

草案中给出了一种在拓扑有效性检验状态机中进行拓扑稳定性判断的方法，使用了两个定时器：拓扑稳定定时器和拓扑不稳定定时器。拓扑保护帧分析状态机对接收到的拓扑保护帧进行分析，如果源站点在当前拓扑表中为无效，MAC(媒体访问控制)地址有变化或边界状态发生改变，都表明拓扑发生了变化。拓扑有效性检验状态机被触发转入START状态，两个定时器设定相同的起点，再转入UNSTABLE状态。在UNSTABLE这一状态中，只要拓扑发生变化，拓扑稳定定时器都将设定新的起点。如果拓扑没有变化，并且拓扑稳定定时器已超时，说明在足够长的时间内拓扑没有变化，给出拓扑稳定的指示，状态机转入STABLE状态，进行后续的有效性检验，只有拓扑再次发生变化时才会触发转入START状态开始新一轮的稳定性判断；如果拓扑发生变化，在更新拓扑稳定定时器的同时将拓扑变化标志设为FALSE，如果在拓扑稳定定时器超时前，不稳定定时器超时，说明在足够长的时间内拓扑一直没有进入稳定状态，给出拓扑不稳定的故障指示。The draft provides a method for judging topology stability in the topology validity checking state machine, which uses two timers: topology stability timer and topology instability timer. The topology protection frame analysis state machine analyzes the received topology protection frame. If the source site is invalid in the current topology table, the MAC (media access control) address changes or the boundary state changes, it indicates that the topology has changed. The topology validity checking state machine is triggered to enter the START state, the two timers set the same starting point, and then enter the UNSTABLE state. In the UNSTABLE state, whenever the topology changes, the topology stability timer will set a new starting point. If there is no change in the topology and the topology stability timer has expired, it means that the topology has not changed for a long enough time, an indication of topology stability is given, and the state machine enters the STABLE state for subsequent validity checks. Only the topology changes again. It will be triggered to enter the START state to start a new round of stability judgment; if the topology changes, the topology change flag will be set to FALSE while updating the topology stability timer. If the controller times out, it means that the topology has not entered a stable state within a long enough time, and a fault indication of topology instability is given.

草案给出的稳定定时器默认超时值为40ms，不稳定定时器默认超时值为10s。这种方法涉及到两个状态机和两个定时器的维护，可操作性较差。其中拓扑保护帧分析状态机需要比较帧信息与当前拓扑表项，给出拓扑改变的标志；而另一个检验拓扑有效性的状态机需要根据拓扑改变的标志，更新定时器或在定时器超时后给出拓扑是否稳定的指示，在工作效率上存在一定问题；此外，这种方法有一定的依赖性，在本地物理链路故障导致拓扑变化的情况下，站点不能立即接收到拓扑保护帧，因此拓扑稳定性不能得到有效检测。The default timeout value of the stable timer given in the draft is 40ms, and the default timeout value of the unstable timer is 10s. This method involves the maintenance of two state machines and two timers, and has poor operability. Among them, the topology protection frame analysis state machine needs to compare the frame information with the current topology entry, and give the topology change flag; and another state machine for checking the validity of the topology needs to update the timer according to the topology change flag or after the timer expires Giving an indication of whether the topology is stable has certain problems in work efficiency; in addition, this method has certain dependencies. In the case of a topology change caused by a local physical link failure, the site cannot immediately receive topology protection frames, so Topological stability cannot be effectively detected.

发明内容 Contents of the invention

本发明的目的是提出一种易操作且高效的弹性分组环拓扑稳定性判断方法。The purpose of the present invention is to propose an easy-to-operate and efficient method for judging the topology stability of an elastic grouping ring.

本发明所述一种判断弹性分组环拓扑稳定性的方法的处理流程如下：The processing flow of a method for judging the topology stability of an elastic packet ring described in the present invention is as follows:

1.拓扑定时模块每隔预定周期向拓扑消息接收处理模块发送拓扑稳定性检测消息，拓扑消息接收处理模块调用拓扑稳定性检测状态机进行处理；1. The topology timing module sends a topology stability detection message to the topology message receiving and processing module every predetermined period, and the topology message receiving and processing module calls the topology stability detection state machine for processing;

2.拓扑稳定性检测状态机采用通信系统中差错检测普遍采用的CRC(Cyclic RedundancyCheck，循环冗余校验)算法来计算当前拓扑表的CRC值，与上一周期的CRC值进行比较，以此判断拓扑是否发生变化。如果拓扑发生变化后下一个周期仍有变化，说明拓扑不稳定，给出告警信息；否则，如果当前CRC值与上一周期一致，说明拓扑已稳定，之前若存在告警则将告警清除。2. The topology stability detection state machine uses the CRC (Cyclic Redundancy Check) algorithm commonly used in error detection in communication systems to calculate the CRC value of the current topology table, and compares it with the CRC value of the previous cycle, so as to Determine whether the topology has changed. If there is still a change in the next cycle after the topology changes, it means that the topology is unstable, and an alarm message is given; otherwise, if the current CRC value is consistent with the previous cycle, it means that the topology is stable, and if there was an alarm before, the alarm will be cleared.

采用本发明所述方法，可以有效检测弹性分组环拓扑的稳定性，操作简易，避免维护多个定时器，并且不依赖于对接收的拓扑保护控制帧的分析，而是自发地对本地站点拓扑表进行周期性分析判断，因此对于本地物理链路故障引起的拓扑变化也能够有效检测。By adopting the method of the present invention, the stability of the elastic packet ring topology can be effectively detected, the operation is simple, the maintenance of multiple timers is avoided, and it does not rely on the analysis of the received topology protection control frame, but spontaneously analyzes the topology of the local site The table performs periodic analysis and judgment, so it can also effectively detect topology changes caused by local physical link failures.

附图说明 Description of drawings

图1是本发明所述方法的处理流程。Fig. 1 is the process flow of the method of the present invention.

图2是本发明所述拓扑稳定性检测状态机的状态转移图。Fig. 2 is a state transition diagram of the topology stability detection state machine of the present invention.

具体实施方式 Detailed ways

下面结合附图，基本按照附图的顺序对技术方案的实施作进一步的详细描述：Below in conjunction with the accompanying drawings, the implementation of the technical solution is described in further detail basically in the order of the accompanying drawings:

图1是本发明所述方法总的消息处理流程图。拓扑定时模块定时发送拓扑稳定性检测消息，链路状态检测模块在链路发生故障时发送链路故障消息，而拓扑保护协议控制帧接收模块则在接收到相关的控制帧后发送拓扑保护控制消息。拓扑消息接收处理模块对这些消息分别进行处理，根据不同的消息类型转入不同的处理流程。对于定时模块发送来的拓扑稳定性检测消息，拓扑消息接收处理模块转入稳定性检测状态机处理；其他消息则调用其他相关处理流程进行处理。Fig. 1 is a general message processing flowchart of the method of the present invention. The topology timing module regularly sends topology stability detection messages, the link state detection module sends link failure messages when a link fails, and the topology protection protocol control frame receiving module sends topology protection control messages after receiving relevant control frames . The topology message receiving and processing module processes these messages separately, and transfers them to different processing procedures according to different message types. For the topology stability detection message sent by the timing module, the topology message receiving and processing module transfers to the stability detection state machine for processing; other messages call other related processing procedures for processing.

拓扑稳定性检测状态机的状态转移如图2所示。状态机正常工作状态为空闲(IDLE)，拓扑稳定无变化。在状态机中采用比较当前拓扑表的CRC值与前一周期拓扑表的CRC值的方法来判断当前拓扑与前一处理周期的拓扑是否一致，从而获知拓扑的变化。The state transition of the topology stability detection state machine is shown in Figure 2. The normal working state of the state machine is idle (IDLE), and the topology is stable and unchanged. In the state machine, the method of comparing the CRC value of the current topology table with the CRC value of the previous cycle topology table is used to judge whether the current topology is consistent with the topology of the previous processing cycle, so as to know the change of the topology.

在空闲(IDLE)状态，如果CRC值发生变化(说明拓扑发生了改变)，状态转入预告警(PRE_ALARM)；如果CRC值不变(说明拓扑没有变化)，状态保持空闲(IDLE)不变，并且将已有的告警恢复。In the idle (IDLE) state, if the CRC value changes (indicating that the topology has changed), the state is transferred to pre-alarm (PRE_ALARM); if the CRC value remains unchanged (indicating that the topology has not changed), the state remains idle (IDLE) unchanged, And restore the existing alarm.

在预告警(PRE_ALARM)状态，如果CRC值发生变化(说明拓扑再次发生了改变)，给出拓扑不稳定的故障告警，状态转入告警(ALARMED)；如果CRC值不变(说明拓扑变化后已趋于稳定)，状态转入空闲(IDLE)，并且将已有的告警恢复。In the pre-alarm (PRE_ALARM) state, if the CRC value changes (indicating that the topology has changed again), a fault alarm of topology instability is given, and the state changes to alarm (ALARMED); if the CRC value does not change (indicating that the topology has changed after tends to be stable), the state turns to idle (IDLE), and the existing alarms are recovered.

在告警(ALARMED)状态，如果CRC值发生变化(说明拓扑不稳定告警后又发生了改变)，状态保持告警(ALARMED)不变；如果CRC值不变(说明拓扑不稳定告警后已趋于稳定)，状态转入空闲(IDLE)，并且将已有的告警恢复。In the alarm (ALARMED) state, if the CRC value changes (indicating that the topology instability alarm has changed again), the state remains the alarm (ALARMED) unchanged; if the CRC value remains unchanged (indicating that the topology instability alarm has stabilized ), the state changes to idle (IDLE), and the existing alarms are restored.

其中CRC值的计算采用了CRC-16算法，将站点维护的拓扑表作为数据块经计算得到CRC值，拓扑表包括各站点MAC(媒体访问控制)地址、有效性、距本站点的跳数、东西向的保护(东西向指的是某个站点的两侧)与边界状态、可达性指示拓扑状态的字段。The calculation of the CRC value uses the CRC-16 algorithm, and the topology table maintained by the site is used as a data block to calculate the CRC value. The topology table includes the MAC (media access control) address of each site, validity, and the number of hops away from the site. , east-west protection (east-west refers to both sides of a site) and boundary status, reachability indicates the field of topology status.

本发明提出的弹性分组环拓扑稳定性判断方法，使用拓扑消息接收处理模块定时进行拓扑稳定性检测，将拓扑表的CRC值作为判断拓扑变化的依据，再根据拓扑变化情况，上告或清除拓扑不稳定告警。本发明所述方法对拓扑稳定性的判断不依赖于对每个接收到的拓扑保护帧的分析，而是判断拓扑表的CRC值，在本地链路故障导致无法及时收到拓扑保护帧的情况下也能够进行有效的检测，具有操作简易高效的特点。The method for judging topology stability of an elastic packet ring proposed by the present invention uses a topology message receiving and processing module to regularly detect topology stability, uses the CRC value of the topology table as a basis for judging topology changes, and reports or clears topology errors according to topology changes Steady alert. The judgment of the topology stability by the method of the present invention does not depend on the analysis of each received topology protection frame, but judges the CRC value of the topology table, and the topology protection frame cannot be received in time due to a local link failure It can also carry out effective detection under the environment, and has the characteristics of simple and efficient operation.

Claims (4)

1, a kind of method of judging spring grouping ring topology stability comprises following processing:
The topology time block sends the topological stability detect-message every predetermined period to topological message sink processing module, and topological message sink processing module is called the crc value of the current topology table of topological stability detected state computer site-local;
In topological stability detected state machine with the crc value of current topology table, compared with the crc value of the topology table of last one-period, judge with this whether topology changes, if the crc value of the topology table of the crc value of current topology table and last one-period is inconsistent, topology changes, next cycle still changes after topology changes, and illustrates that topology is unstable; Otherwise,, illustrated that topology was stable if the crc value of current topology table is consistent with the crc value of the topology table of last one-period.
2, judge the method for spring grouping ring topology stability according to claim 1, it is characterized in that:
The topology table that site-local is safeguarded calculates crc value as data block, and topology table comprises that each website MAC Address, validity, the jumping figure apart from this website, East and West direction protection and boundary condition, accessibility indicate the field of topological state.
3, judge the method for spring grouping ring topology stability according to claim 1, it is characterized in that, further comprise;
The unstable rule of topology provides warning information; Topology is stable, if exist alarm then with alarm clearance.
As the method for judgement spring grouping ring topology stability as described in the claim 3, it is characterized in that 4, the state of described topological stability detected state machine comprises idle condition, alarms state and alarm status in advance,
When idle condition, in topological stability detected state machine,, compared with the crc value of the topology table of last one-period with the crc value of current topology table, if crc value changes, state changes pre-alarm over to; If crc value is constant, it is idle that state keeps, and with existing alarm clearing,
When pre-alarm state, in topological stability detected state machine,, compared with the crc value of the topology table of last one-period with the crc value of current topology table, if crc value changes, provide topological unsettled fault warning, state changes alarm over to; If crc value is constant, state changes the free time over to, and with existing alarm clearing,
When alarm status, in topological stability detected state machine,, compared with the crc value of the topology table of last one-period with the crc value of current topology table, if crc value changes, state keeps alarm constant; If crc value is constant, state changes the free time over to, and with existing alarm clearing.
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