WO2008110085A1 - Procédé de protection contre la redondance d'un pont rpr, dispositif en anneau pour pont rpr et anneau pont rpr - Google Patents

Procédé de protection contre la redondance d'un pont rpr, dispositif en anneau pour pont rpr et anneau pont rpr Download PDF

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Publication number
WO2008110085A1
WO2008110085A1 PCT/CN2008/070327 CN2008070327W WO2008110085A1 WO 2008110085 A1 WO2008110085 A1 WO 2008110085A1 CN 2008070327 W CN2008070327 W CN 2008070327W WO 2008110085 A1 WO2008110085 A1 WO 2008110085A1
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WO
WIPO (PCT)
Prior art keywords
rpr
ring
bridge
state
node
Prior art date
Application number
PCT/CN2008/070327
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English (en)
Chinese (zh)
Inventor
Yilong Zhang
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008110085A1 publication Critical patent/WO2008110085A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H04L12/427—Loop networks with decentralised control
    • 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
    • H04L12/40169—Flexible bus arrangements
    • H04L12/40176—Flexible bus arrangements involving redundancy
    • H04L12/40195—Flexible bus arrangements involving redundancy by using a plurality of nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/22—Alternate routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery

Definitions

  • RPR bridge redundancy protection method RPR bridge ring device and RPR bridge ring
  • the present invention relates to the field of network communication technologies, and in particular, to an RPR bridge redundancy protection method and an RPR bridge ring device, and an RPR bridge ring using the protection method. Background technique
  • RPR Res ilient packet ring
  • the RPR technology is a ring network composed of packet switching nodes.
  • a single RPR ring has application limitations. For some applications, multiple RPR ring coordination is required, that is, there are intersections between multiple RPR rings. The intersection between two RPR rings includes tangency and intersection.
  • the networking performance of the RPR tangential ring has a single point of failure with poor reliability. Therefore, the best way is to use the RPR intersecting ring.
  • the RPR ring close to the user network is generally called the access ring
  • the RPR ring close to the IP backbone is generally called the convergence ring
  • the access ring can also be called a sub-ring
  • the convergence ring can also be called a main ring.
  • a primary ring can intersect multiple subrings. The user accesses the sub-ring and then accesses the IP backbone network through the primary ring. On the metro Ethernet network, the services of the user are aggregated to the IP backbone network through the RPR ring.
  • the RPR intersecting ring provides fast ring protection switching and topology auto-discovery to improve access reliability.
  • the RPR intersecting ring provides fast ring protection switching and topology auto-discovery to improve access reliability.
  • the RPR bridge device carries Layer 2 Ethernet packets through the Ethernet Over RPR and forwards the RPR extension frame on the RPR ring.
  • the RPR carries Layer 2 Ethernet packets, if the two points across the ring are not controlled, loops will occur on the two cross-ring nodes, which is prone to broadcast storms and loop problems.
  • the RPR cross-ring bridge device 1 and the RPR cross-bridge device 2 form a corresponding loop.
  • Embodiments of the present invention provide an RPR bridge redundancy protection method, an RPR bridge ring device, and an RPR bridge ring to avoid forming a broadcast loop between bridge rings.
  • An RPR bridge redundancy protection method is applied to an RPR bridge redundancy protection process when at least two RPR rings respectively intersect a common RPR ring at two nodes, and the RPR ring intersects the common RPR ring.
  • One node of the nodes is the primary node, and the other node is the standby node corresponding to the primary node; the method includes the following steps:
  • An RPR bridge ring device includes a state setting unit, a message receiving unit, a state modifying unit, and a detecting unit, where
  • a state setting unit configured to set an active state or a standby state of the RPR bridge ring device
  • a message receiving unit configured to receive the device state control message, and send the device to the state modifying unit
  • a detecting unit configured to detect, by the RPR bridge ring device, another RPR bridge ring device that intersects the RPR ring and the common RPR ring where the device is located, whether the RPR ring ring device is connected to the common RPR ring;
  • the state modifying unit is configured to instruct the state setting unit to modify the state of the device according to the device state control message received from the message receiving unit and the detection result obtained from the detecting unit.
  • An RPR bridge ring includes a common RPR ring and two RPR rings, and the two RPR rings respectively intersect the common RPR ring at two nodes.
  • the two nodes each include a state setting unit, configured to set an active state or a standby state of the RPR bridge ring device; one of the RPR ring and the common RPR ring intersects as a primary node, The other node is a standby node corresponding to the active node;
  • the standby node when a plurality of sub-rings and one main ring respectively intersect at two nodes, after the standby node receives the device status control message, the standby node first detects whether the primary node is associated with the corresponding active node. Connected, if not connected, does not perform state transition, but maintains the standby state of the standby node. In this way, when the fault occurs on both sides of the cross-ring node on the primary ring, since the two cross-ring nodes cannot be connected, the cross-ring node in the standby state does not migrate to the active state, thereby avoiding the formation of a loop, thereby avoiding The formation of a broadcast storm has protected the business between bridges and rings and improved the reliability of the business.
  • FIG. 1 is a schematic diagram of communication of an RPR bridge ring network in the prior art
  • FIG. 2 is a schematic diagram of a broadcast storm generated by an RPR bridge ring network in the prior art
  • FIG. 3 is a schematic diagram of an RPR bridge ring network according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of an RPR bridge ring device according to an embodiment of the present invention.
  • FIG. 7 is a detailed structural diagram of an RPR bridge ring device according to an embodiment of the present invention. detailed description
  • the STP (Spanning Tree Protocol) or RSTP (Rapid Spanning Tree Protocol) protocol is used to reduce the link, and the minimum spanning tree is generated. Then, the minimum spanning tree is used to forward the packets on the Layer 2 Ethernet network to prevent the two. Layer network communication forms a loop.
  • STP or RSTP re-calculates the minimum spanning tree to obtain a new forwarding tree. This ensures that the fault is prevented and the service is working properly.
  • the convergence speed of STP and RSTP is relatively slow. Even if RSTP can reach the convergence rate of the second level, the service interruption time is too long to meet the carrier-class requirements.
  • the redundancy protection of the RPR bridge ring network can be avoided by forming a cross-ring bridge device on the two RPR bridge rings as a protection group to avoid loop formation. If a ring intersects multiple rings at two points, and a fault occurs on both sides of a cross-ring node on one ring, a loop is still formed, causing a broadcast storm. As shown in FIG. 3, the ring 2 as the primary ring respectively intersects the ring 1 and the ring 3 as sub-rings, the ring 2 and the ring 1 intersect at two nodes A and B, and the ring 2 and the ring 3 intersect at C and D. Nodes.
  • both A and B can be performed.
  • the forwarding of the cross-ring service that is, the two node devices of A and B are all migrated to the Mas ter state.
  • both nodes C and D may also migrate to the Mas ter state. In this way, when the cross-ring service forwarding can be performed on the A, B, C, and D cross-ring nodes, the broadcast loop shown in Figure 3 will appear, causing a broadcast storm.
  • the embodiment of the invention describes a method for RPR bridge redundancy protection when two sub-rings intersect with one main ring.
  • ring 1 primary ring
  • ring 2 and ring 3 subring
  • the ring 2 and the ring 1 may form a protection group 1 including a bridge ring device A and a bridge ring device B
  • the ring 2 and the ring 3 form a protection group 2, which includes a bridge ring device C and a bridge ring device D.
  • Each device in the protection group is set with a priority.
  • the priority is the priority of the devices in the protection group.
  • the bridge device with a higher priority is set as the primary state.
  • the lower priority bridge device is set to the standby state, that is, the device in the active state is preferentially used, and the device in the standby state is enabled when the device in the active state is not working normally.
  • a flowchart of a method for redundancy protection of an RPR bridge includes: A.
  • the device status control packet and the topology protection discovery packet, and the RPR bridge device in the protection group 2 can also receive the device status control packet and the topology protection discovery packet.
  • the standby node determines whether to perform an RPR bridge according to whether the standby node and the corresponding active node are connected on the public RPR ring when receiving the device status control message and the topology protection discovery message. Redundant protection switching.
  • FIG. 5 it is a detailed flowchart of a method for RPR bridge redundancy protection according to an embodiment of the present invention.
  • the device sends the device status control packet and the topology protection discovery packet to the network system.
  • the packet contains the fault information of the E and F nodes, and the protection group 1 and the protection group 1 execute. The following process:
  • the RPR bridge ring device in the protection group 1 receives the device state control packet and the topology protection discovery packet, and the RPR bridge device in the protection group 2 also receives the device state control.
  • the message and topology protection discover the message, and execute 402.
  • the RPR bridge ring device in the protection group (1 and 2) updates the RPR bridge ring network device status list, saves the current bridge ring network device status, and executes 403.
  • the RPR bridge device in the protection group (1 and 2) determines, according to the received topology message and the device information in the device control message, that the device status in the current RPR bridge ring network in the protection group is S lave ( The standby state is still the terminal state, if it is the S lave state, it executes 404; if it is the Math state, it executes 408.
  • the protection group 1 it is determined whether the RPR bridge device A and the RPR bridge device B can communicate on the ring 1; in the protection group 2, it is determined whether the RPR bridge device C and the RPR bridge device D can be on the ring 1 Communication.
  • the way to judge can be: In a protection group, an RPR bridge ring device periodically sends a signal to other devices in the protection group through ring 2. If the response signal returned by the other party is received from ring 2 within a specified time interval, it indicates that the two devices are Can communicate on ring 2, otherwise it means that two devices cannot communicate on ring 2; or
  • the RPR bridge device monitors the topology protection discovery packet and determines whether the two bridge ring devices can communicate on the ring 2 according to the information in the received topology protection discovery packet.
  • protection group 1 Because the two nodes E and F on the ring 2 are faulty, there is no communication between the two nodes A and B on ring 2. At this time, the Slave state of the device in the protection group 1 is maintained. Similarly, in the protection group 2, since the two nodes E and F on the ring 2 are faulty, on the ring 2 (the D nodes cannot communicate with each other, the slave state of the device in the protection group 2 is maintained at this time. Thus, Avoid the formation of loops when the A, B, C, and D nodes are all in the Master state.
  • step 406 If the device in the current RPR bridge ring network in the protection group is in the Slave state and can communicate with other devices in the protection group in the primary ring, determine whether the condition for migrating to the master is met, that is, where the device is located. The Master status device is not found in the protection group, and the Slave status device with higher priority than the device cannot be found. If the condition for migrating to the Master is satisfied, step 407 is performed; otherwise, the Slave state of the device is maintained, and 401 is returned.
  • the device in the Slave state is migrated to the Master state device, and returns to 410.
  • the protection group determines that the current device status is the master state according to the received topology information and the device status control packet, if the following conditions are met, perform 409 to migrate the master state of the device to Slave status: Find the Master status device with higher priority than the device in the protection group to which the device belongs.
  • the migration condition is not met, the current Master state is maintained and 401 is returned.
  • the current configuration of the low priority master device is The high-priority master state device preempts, but needs to detect the The high-priority Mas ter state device lasts for a period of time to determine whether the threshold exceeds a predetermined threshold. If so, the low-priority Mas ter state device in the current RPR bridge ring network exits the Mas ter state and becomes S lave state device, and execute 410.
  • the state change information of the device and the change of the topology result of the network are broadcasted on the RPR bridge ring network through the Mas ter state device, and other nodes are notified by using information such as the device state control message to update the device address mapping on each node. Relationship information, then return to 401.
  • the protection process of the RPR bridge redundancy is described by taking only two sub-rings and the primary ring respectively intersecting the two nodes, and the RPR bridge in the case where two or more sub-rings intersect the primary ring in two nodes.
  • the redundant protection process is similar to the above process, which is equivalent to increasing the number of protection groups.
  • the protection process of RPR bridge redundancy in each protection group is the same as the process shown in Figure 5.
  • Another embodiment of the present invention provides an RPR bridge ring device.
  • FIG. 6 is a schematic structural diagram of an RPR bridge ring device according to an embodiment of the present invention.
  • the device includes: a state setting unit, a state modifying unit, a message receiving unit, and a detecting unit.
  • FIG. 7 is a detailed structural diagram of an RPR bridge ring device according to an embodiment of the present invention.
  • the device comprises: a status setting unit, a status modifying unit, a message receiving unit and a detecting unit, and a protection group setting unit.
  • each RPR ring and the common ring intersect the two nodes of the RPR device's protection group setting unit, and the RPR bridges on the two nodes
  • the ring device forms a protection group
  • the status setting unit on the RPR bridge ring device is based on the protection group set by the protection group setting unit.
  • the status of the RPR bridge ring device is set to the active state or the standby state, so that one RPR bridge ring device in the protection group is the primary device and the other device is the standby device.
  • Device status control messages carry device information, such as device identification and/or priority attributes.
  • the status modification unit After receiving the device status control message, the status modification unit acquires the current status of the device from the status setting unit.
  • the detection unit obtains the connectivity of the two node devices in the protection group on the common RPR ring, and if not, indicates that the state setting unit keeps the device standby. If it is connected, it determines whether to update the status of the device according to the received device status control message and the current status of the device. If it needs to be updated, the status setting unit is instructed to perform corresponding state modification.
  • the state modification unit indicates the state setting.
  • the unit modifies the current standby state of the device to the active state; if the current state of the device is the active state, and the primary device with a higher priority is found in the associated protection group, the state modifying unit indicates that the state setting unit sets the device Current active status.
  • the detection method of the detection unit includes:
  • the detecting unit of the RPR bridge ring device sends a message to another RPR bridge ring device in the protection group to which the device belongs through the public RPR ring, and waits for the other party to answer; if the detecting unit does not receive the message from the public RPR ring within the specified time The response of the other party determines that the two RPR bridges in the protection group cannot be connected on the common RPR ring. Otherwise, it is determined that the two RPR bridge devices in the protection group can communicate on the common RPR ring.
  • the detecting unit of the RPR bridge ring device receives the topology packet, and determines whether the two RPR bridge ring devices in the protection group are connected on the common RPR ring according to the received topology message.
  • this embodiment is an embodiment in which two RPR rings intersect a common RPR ring.
  • the RPR bridge switching device shown in FIG. 7 is used in the RPR bridge ring, and one of the two nodes intersecting the RPR ring and the common RPR ring is a primary node, and the other node is a standby node;
  • the nodes include: a status setting unit, a message receiving unit, a status modifying unit, and a detecting unit.
  • the standby node when the standby node receives the device status control message, the standby node first detects whether the primary ring and the corresponding ring are corresponding to each other. The primary node is connected to determine whether to perform a state transition. If it is not connected, the state transition is not performed, but the standby state of the standby node is maintained. When the fault occurs on both sides of the cross-ring node on the primary ring, the two cross-ring nodes cannot be connected, and the standby state crosses. The ring node does not migrate to the active state, thus avoiding the formation of a loop, thus avoiding the formation of a broadcast storm, protecting the service between the bridges and the ring, and improving the reliability of the service.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un procédé de protection contre la redondance d'un pont RPR et un dispositif en anneau pour pont RPR, tous deux utilisés pour assurer une protection contre la redondance lorsqu'au moins deux anneaux RPR croisent respectivement deux nœuds publics RPR. Pour cela, un des deux nœuds d'intersection de l'anneau RPR et de l'anneau public RPR est configuré sur le nœud principal, alors qu'un autre nœud est configuré sur le nœud de sauvegarde. Le procédé détermine alors si le nœud de sauvegarde assure une protection contre la redondance d'un pont RPR conformément à l'état de liaison du nœud de sauvegarde et du nœud principal correspondant reliés à l'anneau public RPR. Il est donc possible d'éviter la formation d'une boucle lors de l'intersection d'un anneau avec deux nœuds de plusieurs anneaux.
PCT/CN2008/070327 2007-03-13 2008-02-19 Procédé de protection contre la redondance d'un pont rpr, dispositif en anneau pour pont rpr et anneau pont rpr WO2008110085A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNB2007100056933A CN100461739C (zh) 2007-03-13 2007-03-13 Rpr桥冗余保护方法及rpr桥环设备
CN200710005693.3 2007-03-13

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WO2008110085A1 true WO2008110085A1 (fr) 2008-09-18

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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100461739C (zh) * 2007-03-13 2009-02-11 华为技术有限公司 Rpr桥冗余保护方法及rpr桥环设备
CN101197747B (zh) * 2007-12-14 2010-07-28 北京国电智深控制技术有限公司 工业实时控制以太网冗余容错网络系统及方法
CN102546345A (zh) * 2011-12-30 2012-07-04 Ut斯达康通讯有限公司 利用生成树协议实现弹性分组环跨环保护的方法
CN106453020B (zh) * 2016-10-24 2019-07-02 北京爱其科技有限公司 一种应用于智能控制系统的神经网络环控制方法
CN107547330B (zh) * 2017-08-31 2021-05-28 新华三技术有限公司 一种传输业务数据的方法和节点设备
CN107547331A (zh) * 2017-09-25 2018-01-05 新华三技术有限公司 Rpr相交环中rpr节点的转发状态控制方法及装置
CN109617777B (zh) * 2018-12-24 2021-08-20 新华三技术有限公司 一种rpr相交环的业务数据转发方法及装置
CN109981454A (zh) * 2019-03-29 2019-07-05 中国人民银行清算总中心 动态路由广播报文的广播控制方法和装置
CN111510364B (zh) * 2020-03-31 2022-02-22 新华三信息安全技术有限公司 一种报文转发方法和系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0349099A2 (fr) * 1988-06-27 1990-01-03 Digital Equipment Corporation Partage de charge transparent pour réseaux parallèles
CN1767491A (zh) * 2004-10-26 2006-05-03 中兴通讯股份有限公司 一种弹性分组环的相切环的桥接方法
CN1870558A (zh) * 2006-05-17 2006-11-29 杭州华为三康技术有限公司 弹性分组环中相交环的环路检测方法和系统
CN1941730A (zh) * 2005-09-26 2007-04-04 华为技术有限公司 实现rpr桥冗余保护的方法
CN101022391A (zh) * 2007-03-13 2007-08-22 华为技术有限公司 Rpr桥冗余保护方法及rpr桥环设备

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7274656B2 (en) * 2001-07-10 2007-09-25 Tropic Networks Inc. Protection system and method for resilient packet ring (RPR) interconnection
EP1324543A1 (fr) * 2001-12-26 2003-07-02 Alcatel Méthode pour la protection de réseaux RPR à topologie étendue, en particulier pour les interconnections "anneau RPR à anneau RPR" et maillées
CN100466582C (zh) * 2005-06-20 2009-03-04 杭州华三通信技术有限公司 弹性分组环的相交互连方法及相交站点、相交弹性分组环
CN100401712C (zh) * 2005-10-14 2008-07-09 杭州华三通信技术有限公司 以太网自动保护系统相切环的故障处理方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0349099A2 (fr) * 1988-06-27 1990-01-03 Digital Equipment Corporation Partage de charge transparent pour réseaux parallèles
CN1767491A (zh) * 2004-10-26 2006-05-03 中兴通讯股份有限公司 一种弹性分组环的相切环的桥接方法
CN1941730A (zh) * 2005-09-26 2007-04-04 华为技术有限公司 实现rpr桥冗余保护的方法
CN1870558A (zh) * 2006-05-17 2006-11-29 杭州华为三康技术有限公司 弹性分组环中相交环的环路检测方法和系统
CN101022391A (zh) * 2007-03-13 2007-08-22 华为技术有限公司 Rpr桥冗余保护方法及rpr桥环设备

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