WO2007033563A1 - Procede de protection de redondance pour anneau de paquet resiliant de mode pont - Google Patents

Procede de protection de redondance pour anneau de paquet resiliant de mode pont Download PDF

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Publication number
WO2007033563A1
WO2007033563A1 PCT/CN2006/001852 CN2006001852W WO2007033563A1 WO 2007033563 A1 WO2007033563 A1 WO 2007033563A1 CN 2006001852 W CN2006001852 W CN 2006001852W WO 2007033563 A1 WO2007033563 A1 WO 2007033563A1
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WO
WIPO (PCT)
Prior art keywords
cross
ring
bridge device
bridge
protection group
Prior art date
Application number
PCT/CN2006/001852
Other languages
English (en)
French (fr)
Inventor
Jian Li
Yilong Zhang
Zhifeng He
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.
Priority to CN2006800122873A priority Critical patent/CN101160836B/zh
Priority to CA002622131A priority patent/CA2622131A1/en
Publication of WO2007033563A1 publication Critical patent/WO2007033563A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46Interconnection of networks
    • H04L12/4604LAN interconnection over a backbone network, e.g. Internet, Frame Relay
    • H04L12/462LAN interconnection over a bridge based backbone
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42Loop networks
    • H04L12/437Ring fault isolation or reconfiguration
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46Interconnection of networks
    • H04L12/4637Interconnected ring systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/28Routing or path finding of packets in data switching networks using route fault recovery

Definitions

  • the present invention relates to an elastic packet data ring technique, and more particularly to a method for bridge mode resilient packet ring redundancy protection. Background of the invention
  • RPR packet data ring
  • a ring network composed of RPR technology is called an RPR ring network and can be simply referred to as an RPR ring.
  • a packet switching device on a ring network is called an RPR device.
  • the RPR device uses the 48-bit MAC address used in the Ethernet as the address identifier to uniquely identify the RPR device and carries Layer 2 Ethernet packets through the Ethernet Over RPR, the RPR ring can also be called the RPR bridge ring. Or bridge mode RPR ring.
  • the device on the RPR bridge ring can also be referred to as an RPR bridge device, and the MAC address on the RPR bridge device can also be referred to as an RPR MAC address.
  • Figure 1 a schematic diagram of the structure of two RPR bridge rings intersecting two RPR bridge devices is depicted.
  • RPR bridge rings there are two RPR bridge rings, which are RPR bridge ring 1 and RPR bridge ring 2, respectively.
  • There are four RPR bridge devices on each RPR. bridge ring while RPR bridge ring 1 and RPR bridge ring 2 intersect at RPR cross-bridge device 1 and RPR cross-bridge device 2.
  • the RPR cross-ring bridge device is an RPR bridge device that is located on two RPR bridge rings.
  • the RPR cross-ring bridge device is responsible for forwarding data packets between two RPR bridge rings.
  • the RPR. cross-ring bridge device is simply referred to as a cross-ring bridge device, and the RPR bridge device is called a bridge. Ready.
  • the RPR bridge ring On the RPR bridge ring, the RPR bridge ring carries Layer 2 Ethernet packets, and the packets between the RPR bridge rings are forwarded through the Address Resolution Protocol (MAC). Therefore, the two RPR bridge rings intersect.
  • the RPR cross-bridge device generates a loop, that is, a loop occurs between the RPR cross-bridge device 1 and the RPR cross-bridge device 2 as shown in FIG. 1, and a broadcast storm occurs.
  • the prior art method performs link reduction through Spanning Tree Protocol (STP) or Rapid Spanning Tree Protocol (RSTP) to generate a minimum spanning tree without loops, and then The minimum spanning tree is used to forward packets on Layer 2 Ethernet to prevent Layer 2 network communication from forming loops.
  • STP or RSTP recalculates the minimum spanning tree and obtains a new forwarding tree to ensure normal service after the fault occurs.
  • the main purpose of the present invention is to provide a method for redundancy protection of a bridge mode resilient packet ring. After the RPR bridge ring fails, the RPR bridge ring can be quickly recovered, thereby ensuring the RPR bridge ring. The business is in normal use.
  • a bridge mode resilient packet ring redundancy protection method setting a priority of each cross-loop bridge device; forming a protection group by one or more cross-ring bridge devices simultaneously located in two elastic packet data ring RPR bridge rings, and setting a protection group
  • a cross-ring bridge device is used as a cross-ring bridge device, which is responsible for forwarding reports.
  • the alternate cross-ring bridge device when the protection group changes, perform the following steps:
  • the protection group changes: The topology of the RPR bridge ring where the protection group is located changes.
  • Each of the cross-ring bridge devices is separately configured to save a node information table of each cross-ring bridge device protection group information in the protection group.
  • the protection group changes to:
  • the protection group information of the cross-ring bridge device in the protection group changes.
  • a control packet is set, and when the protection group information changes, the cross-ring bridge device that changes the protection group information broadcasts a control packet to the protection group, which carries its own protection group information; When the control message is reached, the step A is performed.
  • step A is:
  • the primary cross-ring bridge device When the primary cross-ring bridge device does not have the cross-ring forwarding capability, or the cross-ring bridge device with the cross-ring forwarding capability is higher in priority than the protection group, the primary cross-loop bridge device exits the active state;
  • the backup cross-ring bridge device is upgraded as the primary cross-span. Ring bridge equipment.
  • the main cross-ring bridge device exits the active state, and includes the following steps:
  • the primary cross-ring bridge device determines whether it has the cross-loop forwarding capability, and if yes, performs step A12; otherwise, exits the active state;
  • the primary cross-ring bridge device determines whether there is a cross-ring bridge device with a cross-ring forwarding capability with a higher priority than the self-protection group. When the protection group has a cross-ring forwarding capability with a higher priority than itself, The bridge device, the primary cross-ring bridge device exits the active state.
  • the standby cross-ring bridge device is upgraded to be a primary cross-ring bridge device, and includes the following steps:
  • the standby cross-ring bridge device determines whether it has the capability of the cross-ring forwarding, and when it has the capability of the cross-ring forwarding, step A22 is performed;
  • A22. Determine whether there is a cross-ring bridge device with a cross-ring forwarding capability with a higher priority than the self-protection group. If there is no cross-ring bridge device with a cross-ring forwarding capability higher than the self-protection group in the protection group, The spare cross-ring bridge device is upgraded to be a primary cross-ring bridge device.
  • determining whether the cross-ring forwarding capability of the self is:
  • the primary cross-ring bridge device determines whether there is a cross-ring bridge device with a cross-ring forwarding capability with a higher priority than the self-protection group:
  • step A121 determining whether there is a cross-ring bridge device with a higher priority than the self-protection group, when there is a cross-ring bridge device with a higher priority than the self-protection group, step A122 is performed;
  • A122 Determine whether the cross-ring bridge device with a higher priority than the own has the cross-ring forwarding capability. When the cross-ring bridge device with a higher priority than the own has the cross-ring forwarding capability, the primary cross-ring bridge device exits the active state. .
  • the standby cross-ring bridge device determines whether there is a cross-ring bridge device with a cross-ring forwarding capability with a higher priority than the self-protection group:
  • A22U determines whether there is a cross-ring bridge device with a higher priority than the self-protection group. If yes, go to step A222; otherwise, upgrade to the primary cross-ring bridge device;
  • the standby cross-ring forwarding device is mainly used for the color-forwarding Use a cross-ring bridge device.
  • Each of the cross-ring bridge devices is separately configured to save at least a node information table of priority information of each cross-bridge device in the protection group;
  • the determining whether there is a cross-ring bridge device having a higher priority than the self-protection group is: searching for a node information table set by itself, and performing, according to the record of the node information table, performing the determining whether the protection group has a higher priority than the self-priority Cross-loop bridge equipment.
  • the cross-ring forwarding capability of the cross-ring bridge device with higher priority than itself is determined as follows: Determine whether two RPR bridge interfaces of the cross-ring bridge device with higher priority than the two have their own two RPR bridge interfaces respectively. Connected on the RPR bridge ring,
  • the cross-ring bridge device has cross-ring forwarding capability; otherwise, the cross-ring bridge device does not have cross-ring forwarding capability.
  • the method further includes: each cross-loop bridge device refreshes its own topology structure table; and determining whether the two RPR bridge interfaces of the cross-ring bridge device having higher priority than the two are respectively associated with two RPR bridge interfaces of the same
  • the two RPR bridges are connected to each other to: determine whether the two RPR bridge interfaces of the cross-ring bridge device with higher priority are in the topology table of the two RPR rings to which they belong respectively.
  • the two RPR bridge interfaces of the cross-ring bridge device with higher priority than the two are respectively connected to the two RPR bridge interfaces on the two RPR bridge rings; otherwise, the priority is higher than itself
  • the two RPR bridge interfaces of the cross-bridge device do not communicate with the two RPR bridge interfaces of the two RPR bridge rings.
  • the protection group information includes at least: a cross-ring bridge device priority information, a primary standby state.
  • the primary cross-ring bridge device is responsible for forwarding the packet as: forwarding, forwarding, or forwarding a part of the packet having the common feature.
  • the method for the bridge mode resilient packet ring redundancy protection provided by the present invention is to form a protection group by the cross-ring bridge device, and set a cross-ring bridge device in the protection group as the primary cross-ring bridge device, which is responsible for forwarding the packet;
  • the priority of each cross-ring bridge device is set at the same time.
  • the cross-ring bridge device with the highest priority with cross-ring forwarding capability is determined to be the primary cross-ring bridge. Ready.
  • the RPR bridge ring can be changed, the RPR bridge ring can be quickly recovered, the service on the RPR bridge ring can be used normally, and the network communication delay is reduced, and the network communication is reduced. The load. BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic structural view of two RPR bridge rings intersecting in the prior art
  • FIG. 2 is a flow chart of redundancy protection of a primary cross-ring bridge device according to the present invention
  • FIG. 3 is a flow chart of redundancy protection of a backup cross-ring bridge device according to the present invention. Mode for carrying out the invention
  • the core idea of the present invention is to form a protection group of one or more cross-ring bridge devices that intersect two RPR bridge rings, and determine a cross-ring bridge device as a primary cross-ring bridge device in the protection group, and the rest are spare cross-ring bridges. device.
  • the primary cross-ring bridge device is responsible for forwarding data between the two RPR bridge rings; and the standby cross-ring bridge device only needs to continue to be responsible for the upgrade of the primary cross-ring bridge device when the primary cross-ring bridge device fails. Forwarding of data packets between RPR bridge rings.
  • the primary cross-ring bridge device is responsible for forwarding data packets between two RPR bridge rings:
  • the primary cross-ring bridge device is responsible for forwarding all packets or partial data with common features according to specific settings.
  • the forwarding of the packet, the standby cross-ring bridge device is not responsible for the forwarding of this part of the data packet.
  • the primary cross-ring bridge device fails and needs to be re-selected, it can be reflected by the topology change of the RPR bridge ring. Since the topology discovery and topology convergence of the RPR bridge ring only takes 50 milliseconds, after the topological change of the RPR bridge ring, the time of re-determining the new primary cross-ring bridge device will be determined by using the topology topology unique to the RPR bridge ring. Less than 100 seconds.
  • the primary cross-ring bridge device and the backup cross-ring bridge device can utilize the topology discovery function unique to the RPR bridge ring to learn the topology information of other cross-ring bridge devices in the protection group.
  • the information enables the primary cross-ring bridge device in the protection group to be re-determined in time when the topology of the protection group changes.
  • the node information table is newly set in each cross-ring bridge device of the protection group.
  • the node information table includes at least: device ID, device priority, current state of the device, and RPR MAC information of the current two interfaces of the device.
  • the cross-ring bridge device has two interfaces because the cross-bridge device connects two RPR bridge rings, so the cross-ring bridge device has two interfaces for connecting two RPR bridge rings respectively.
  • the device priority setting can be configured according to the needs, and the device with a small value can be set to have a higher priority.
  • the device with a larger value can also be set with a higher priority.
  • the device ID can be determined by the size of the device ID.
  • Step 201 After receiving the topology packet, the primary cross-ring bridge device recalculates the current topology structure, and after the topology convergence, refreshes the topology structure table stored by itself.
  • the primary cross-ring bridge device since the primary cross-ring bridge device is located on two RPR bridge rings at the same time, the topology table of two RPR bridge rings is simultaneously stored in the primary cross-ring bridge device.
  • the primary cross-ring bridge device receives the topology packet from the RPR bridge ring 1, the primary cross-ring bridge device refreshes its stored RPR bridge ring 1. If the primary cross-ring bridge device receives the topology packet from the RPR bridge ring 2, the primary cross-ring bridge device refreshes the topology structure table of the RPR bridge ring 2 stored by itself.
  • Step 20 The primary cross-ring bridge device determines whether its two RPR bridge interfaces have the cross-ring forwarding capability. If yes, go to step 203; otherwise, go to step 206.
  • the two RPR bridge interfaces of the two have cross-ring forwarding capability, and It is as follows: It is determined whether the two RPR bridge interfaces can forward packets in a positive manner. If the packets can be forwarded normally, the device can have the capability of trans-ring forwarding. Otherwise, the inter-ring forwarding capability is not available.
  • Step 203 Find a node information table stored by itself, and determine whether there is a cross-loop bridge device with a higher priority than itself in the protection group. If yes, execute step 204; otherwise, execute step 205.
  • This step needs to be performed at all nodes in the protection group, regardless of whether the state of the cross-ring bridge device is invalid before. This ensures that no high-priority cross-ring bridge devices are missed.
  • Some cross-ring bridge devices fail on the RPR bridge ring due to link failure or other reasons. However, due to link recovery, the high-priority cross-ring bridge device reappears on the RPR bridge ring and acts as the primary cross-ring. Bridge equipment.
  • Step 204 Determine whether the cross-ring bridge device with higher priority than itself has the capability of cross-ring forwarding. If yes, go to step 206; otherwise, go to step 205.
  • the cross-ring bridge device with higher priority than the self in the protection group may have more than one cross-ring bridge device with higher priority than itself because of the network topology change, but as long as there is a higher priority than itself If the cross-ring bridge device has the capability of cross-ring forwarding, step 206 is performed.
  • the method for determining whether the cross-ring bridge device with higher priority than the own has the cross-ring forwarding capability can adopt the following method. First, suppose that the cross-ring bridge device with higher priority than its own is device A, and the RPR bridge interfaces on the two RPR bridge rings are respectively RPR bridge interface A1 and RPR bridge interface A2; the current active cross-ring bridge device is device B, The interfaces of device B on the two RPR bridge rings are respectively RPR bridge interface B1 and RPR bridge interface B2.
  • Whether the cross-ring bridge device having the higher priority than the self-priority has the cross-ring forwarding capability is: determining whether the RPR bridge interface A1 of the device A is connected to the RPR bridge interface B1 of the device B on the RPR bridge ring 1 and the device A Whether the RPR bridge interface A2 is connected to the RPR bridge of device B on the RPR bridge ring 2 B2 is connected. If the RPR bridge interface A1 of the device A is connected to the RPR bridge interface B1 of the device B, and the RPR bridge interface A2 of the device A is connected to the RPR bridge interface B2 of the device B, the device A has the cross-ring forwarding capability.
  • the device B searches in the topology information table of the RPR bridge ring 1 of the device, and determines whether the device A is present.
  • RPR bridge interface A1 if present, the RPR bridge interface A1 of device A is connected to the RPR bridge interface B1 of device B on the RPR bridge ring 1; otherwise, the RPR bridge interface A1 of device A is on the RPR bridge ring 1 and device B.
  • the RPR bridge interface B1 is not connected. It is determined that the RPR bridge interface A2 of the device A is connected to the RPR bridge interface B2 of the device B on the RPR bridge ring 2, and may also be the same as the RPR bridge interface A1, and will not be described in detail herein.
  • Step 205 The primary cross-ring bridge device ends the current processing.
  • This step indicates that the current active cross-ring bridge device is still in good working state in the current protection group, and there is no cross-ring forwarding capability with higher priority than the current active cross-ring bridge device.
  • Step 206 The primary cross-ring bridge device exits the active state.
  • the backup spanning bridge device in the protection group When the primary cross-ring bridge receives and processes the topology packet, the backup spanning bridge device in the protection group also receives and processes the topology packet.
  • the specific processing process is shown in Figure 3:
  • Step 301 After receiving the topology packet, the standby cross-ring bridge device recalculates the current topology structure, and after the topology convergence, refreshes the topology structure table stored by itself.
  • the method for refreshing is the same as the method for refreshing the primary cross-ring bridge device in step 201, and details are not described herein.
  • Step 302 The standby cross-ring bridge device determines whether the two RPR bridge interfaces of the two have the cross-ring forwarding capability. If yes, go to step 303; otherwise, go to step 306.
  • Step 303 Search for the node information table stored by itself, and determine whether there is a cross-loop bridge device with a higher priority than itself in the protection group. If yes, go to step 304; otherwise, go to step 305.
  • Step 304 Determine whether the cross-ring bridge device with higher priority than itself has the capability of cross-ring forwarding. If yes, go to step 306; otherwise, go to step 305.
  • step 306 is performed.
  • the method for determining whether the cross-ring bridge device with higher priority than the own has the cross-ring forwarding capability can adopt the same method as that in step 204.
  • Step 305 The standby cross-ring bridge device is upgraded to the active state.
  • Step 306 The standby cross-ring bridge device ends the current processing.
  • Step 306 shows that in the current protection group, since the cross-ring bridge device with higher priority than itself has the cross-ring cross-loop forwarding capability, it does not have the condition to become the primary cross-ring bridge device.
  • the waiting time may be further set, and the primary cross-ring bridge device is ready to exit the active state, that is, the process proceeds to between steps 204 and 206, and the standby cross-ring bridge device is ready to be upgraded as the primary span.
  • the ring bridge device that is, the execution of the cross-ring device and the standby cross-ring bridge device waiting for the set waiting time between steps 304 and 305, determining that the current protection group has the cross-ring forwarding capability and the highest priority cross-ring
  • the bridge device status is stable, re-execute Corresponding to step 206, step 305; otherwise, the corresponding step 205, step 306 is performed.
  • the primary cross-ring bridge device and the standby cross-ring bridge device can also set the number of waiting for topology packets. That is, the cross-ring bridge device has the cross-ring forwarding capability in the current protection group after waiting for the set number of waiting topology packets. And the status of the highest priority cross-ring bridge device is still stable, and then perform the corresponding operation.
  • each cross-ring bridge device in the protection group can detect whether a new cross-ring bridge device is added to the protection group or the cross-ring bridge device is deleted. However, in the protection group, a new control message can be added to the protection group to transfer the status of each cross-bridge device within the protection group.
  • the control packet carries at least the device ID, the device priority, the current state of the device, and the RPR MAC information of the current two interfaces of the device.
  • the information carried in the control packet is also referred to as device protection. Group information.
  • the node information table of each cross-ring bridge device in the protection group may be updated according to the received control message sent by other cross-ring bridge devices and its current state, which is specifically:
  • the node information table is not the protection group information of the local node.
  • the control packet is updated according to the received control packet, and the protection group information of the node itself is updated according to its own configuration and the current primary standby state calculated according to the current RPR bridge ring topology.
  • a cross-loop bridge device within a protection group has its own priority reduced for some reason, such as an artificial setting. Then, after the priority of the cross-ring bridge device is lowered, the control packet is broadcasted to the other cross-ring bridge devices in the protection group, and the changed protection group information is carried. Other devices in the protection group will update their node status information table according to the received protection group information, and process accordingly.
  • the specific processing procedure of the primary cross-ring bridge device is the same as that of FIG. 2, and the processing procedure of the standby cross-ring bridge device is the same as that of FIG. 3 and will not be described in detail herein.
  • the control packet broadcasts other cross-ring bridge devices in the protection group when the priority of the cross-ring bridge device changes. It can also be broadcasted to other cross-ring bridge devices in its own primary standby state.
  • the primary standby state may be a change of the primary standby state due to the topology transformation, or may be a change caused by other factors such as artificial configuration.
  • control packet can not only broadcast other devices in the protection group when the protection group information of the cross-ring bridge device changes, but also periodically.
  • the primary cross-ring bridge device performs the flow shown in Figure 2 whenever a control message is received; the backup cross-bridge device performs the flow shown in Figure 3.
  • the standby spanning bridge device in the active state can be set to wait for the set number of waiting control packets.
  • the ring forwarding capability and the highest priority cross-ring bridge device state are still stable, the corresponding operation is performed.

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Description

一种桥模式弹性分组环冗余保护的方法 技术领域
本发明涉及弹性分组数据环技术, 尤指一种桥模式弹性分组环冗余 保护的方法。 发明背景
在各种城域网技术不断快速发展的今天, 弹性分组数据环 (RPR ) 以其技术的先进性、 投资的有效性、 性能的优越性、 支持业务的多样性 为越来越多的城域网所使用。 RPR是为了满足基于分组城域网的需求而 设计的新型网络体系结构和技术, 是一种由分组交换设备组成的环形网 络。
应用 RPR技术组成的环形网络称为 RPR环网络, 可以简称为 RPR 环; 环形网絡上的分组交换设备称为 RPR设备。 当 RPR设备采用以太 网中用到的 48位 MAC地址作为地址标识用于唯一标识 RPR设备, 并 通过 Ethernet Over RPR的方式承载二层以太网报文时, 则 RPR环还可 称为 RPR桥环或桥模式 RPR环。 RPR桥环上的设备还可以称为 RPR桥 设备, RPR桥设备上的 MAC地址又可称为 RPR MAC地址。 如图 1所 示, 描述了两个 RPR桥环相交于两个 RPR桥设备的结构示意图。
在图 1中存在两个 RPR桥环, 分别为 RPR桥环 1和 RPR桥环 2。 在每个 RPR.桥环上都存在四个 RPR桥设备, 同时 RPR桥环 1和 RPR 桥环 2相交于 RPR跨环桥设备 1和 RPR跨环桥设备 2。其中,所述 RPR 跨环桥设备为同时位于两个 RPR桥环上的 RPR桥设备, RPR跨环桥设 备负责转发两个 RPR桥环之间的数据报文。为了简化描述,在下面的描 述中将 RPR.跨环桥设备简称为跨环桥设备, 将 RPR桥设备筒称为桥设 备。
在 RPR桥环上, 由于 RPR桥环上承载的是二层以太网报文, 并且 RPR桥环之间的报文是通过地址解析协议(MAC )进行转发, 因此在两 个 RPR桥环相交的 RPR跨环桥设备就会产生回路, 即在如图 1所示的 RPR跨环桥设备 1和 RPR跨环桥设备 2之间产生回路, 出现广播风暴 现象。
为了避免回路的产生以及广播风暴的问题, 现有技术中的方法是通 过生成树协议(STP )、 或者快速生成树协议(RSTP )进行链路裁减, 生成无环路的最小生成树, 然后依据最小生成树来转发在二层以太网上 的报文, 以防止二层网络通信形成环路。 并且, 在当二层网絡上出现设 备或者链路故障的时候, STP或者 RSTP就会重新进行最小生成树的计 算, 获得一个新的转发树, 从而确保故障发生后业务的正常工作。
采用 STP、 RSTP 的方法虽然可以解决跨环节点之间出现环路的问 题, 但却因为 STP、 RSTP的收敛速度较慢, 即使是 RSTP也只能达到 秒级的水平, 因此造成了 RPR桥环故障发生后业务的恢复时间增长, 网 絡通信时间也随之延长, 加重了网絡通信的负荷。 发明内容
有鉴于此, 本发明的主要目的在于提供一种桥模式弹性分组环冗余 保护的方法, 应用该方法能够使 RPR桥环发生故障后, RPR桥环能够快 速恢复, 从而保证 RPR桥环上的业务正常使用。
为达到上述目的, 本发明的技术方案是这样实现的:
一种桥模式弹性分组环冗余保护的方法, 设置各跨环桥设备的优先 级; 由同时位于两个弹性分組数据环 RPR桥环的一个以上跨环桥设备组 成保护组, 设置保护組内一跨环桥设备为主用跨环桥设备, 负责转发报 文, 其他为备用跨环桥设备; 当保护组发生变化时, 执行以下步骤:
A、 确定具有跨环转发能力的优先级最高的跨环桥设备为主用跨环 桥设备。
其中, 所述保护组发生变化为: 所述保护组所在 RPR桥环的拓朴结 构发生变化。
其中, 各跨环桥设备分别设置, 用于保存保护组内各跨环桥设备保 护組信息的节点信息表。
其中, 所述保护组发生变化为: 保护组内跨环桥设备的保护组信息 发生变化。
其中, 设置控制报文, 当保护组信息发生变化时, 保护组信息发生 变化的跨环桥设备向保护组内广播发送控制报文, 其中携带自身的保护 组信息; 其他各跨环桥设备收到控制报文时, 执行所述步骤 A。
其中, 所述步骤 A为:
当主用跨环桥设备不具备跨环转发能力、 或保护组内存在优先级比 自身高的具备跨环转发能力的跨环桥设备时, 所述主用跨环桥设备退出 主用状态;
同时, 当备用跨环桥设备具备跨环转发能力、 并且保护组内不存在 优先级比自身高的具备跨环转发能力的跨环桥设备时, 所述备用跨环桥 设备升级为主用跨环桥设备。
其中, 所述主用跨环桥设备退出主用状态, 包括以下步骤:
Al l , 主用跨环桥设备判断自身是否具备跨环转发能力, 如果是, 则执行步骤 A12; 否则, 退出主用状态;
A12、 主用跨环桥设备判断保护组内是否存在优先级比自身高的具 备跨环转发能力的跨环桥设备, 当保护组内存在优先级比自身高的具备 跨环转发能力的跨环桥设备, 所述主用跨环桥设备退出主用状态。 其中,所述备用跨环桥设备升级为主用跨环桥设备, 包括以下步骤:
A21、 备用跨环桥设备判断自身是否具备跨环转发能力, 当自身具 备跨环转发能力时, 则执行步骤 A22;
A22、 判断保护组内是否存在优先级比自身高的具备跨环转发能力 的跨环桥设备, 当保护组内不存在优先级比自身高的具备跨环转发能力 的跨环桥设备时 , 所述备用跨环桥设备升级为主用跨环桥设备。
其中, 所述判断自身的是否具备跨环转发能力为:
判断自身的两个 RPR桥接口是否均正常工作, 如果是, 则自身具备 跨环转发能力; 否则, 不具备跨环转发能力。
其中, 步骤 A12中, 所述主用跨环桥设备判断保护组内是否存在优 先级比自身高的具备跨环转发能力的跨环桥设备为:
A121、 判断保护组内是否存在比自身优先级高的跨环桥设备, 当保 护组内存在比自身优先级高的跨环桥设备, 执行步骤 A122;
A122、 判断比自身优先级高的跨环桥设备是否具备跨环转发能力, 当比自身优先级高的跨环桥设备是否具备跨环转发能力, 所述主用跨环 桥设备退出主用状态。
其中, 步骤 A22中, 所述备用跨环桥设备判断保护组内是否存在优 先级比自身高的具备跨环转发能力的跨环桥设备为:
A22U 判断保护组内是否存在比自身优先级高的跨环桥设备, 如果 存在, 则执行步骤 A222; 否则, 升级为主用跨环桥设备;
A222, 判断比自身优先级高的跨环桥设备是否具备跨环转发能力, 当比自身优先级高的跨环桥设备不具备跨环转发能力时, 所述备用跨环 转发设备升綵为主用跨环桥设备。
其中, 各跨环桥设备分别设置, 用于至少保存保护组内各跨环桥设 备优先级信息的节点信息表; 所述判断保护组内是否存在比自身优先级高的跨环桥设备为: 查找 自身设置的节点信息表, 根据节点信息表的记录, 执行所述判断保护组 内是否存在比自身优先级高的跨环桥设备。
其中 , 判断比自身优先级高的跨环桥设备是否具备跨环转发能力 为: 判断比自身优先级高的跨环桥设备的两个 RPR桥接口是否与自身的 两个 RPR桥接口分别在两个 RPR桥环上连通 ,
如果是, 则所述跨环桥设备具备跨环转发能力; 否则, 则所述跨环 桥设备不具备跨环转发能力。
另外, 该方法进一步包括, 各跨环桥设备刷新自身的拓朴结构表; 所述判断比自身优先级高的跨环桥设备的两个 RPR桥接口是否与自 身的两个 RPR桥接口分别在两个 RPR桥环上连通为: 判断比自身优先级 高的跨环桥设备的两个 RPR桥接口是否分别存在于对应的自身所属的两 个 RPR环的拓朴结构表中,
如果是,' 则所述比自身优先级高的跨环桥设备的两个 RPR桥接口与 自身的两个 RPR桥接口分别在两个 RPR桥环上连通; 否则, 所述比自身 优先级高的跨环桥设备的两个 RPR桥接口不与自身的两个 RPR桥接口分 别在两个 RPR桥环上连通。
其中, 所述保护组信息至少包括为: 跨环桥设备优先级信息、 主备 用状态。
其中, 所述主用跨环桥设备负责转发报文为: 负责转发全部 4艮文、 或转发具有共同特征的部分报文。
本发明所提供的一种桥模式弹性分组环冗余保护的方法, 通过由跨 环桥设备组成保护组, 设置保护组内一跨环桥设备为主用跨环桥设备, 负责转发报文; 并同时设置各跨环桥设备的优先级; 当保护组发生变化 时, 确定具有跨环转发能力的优先级最高的跨环桥设备为主用跨环桥设 备。 通过利用本发明所提供的方法, 能使 RPR桥环发生变化后, 实现了 RPR桥环的快速恢复, 保证 RPR桥环上的业务正常使用, 同时也减少了 网络通信时延, 减轻了网络通信的负荷。 附图简要说明
图 1为现有技术中两个 RPR桥环相交的结构示意图;
图 2为本发明中主用跨环桥设备冗余保护的流程图;
图 3为本发明中备用跨环桥设备冗余保护的流程图。 实施本发明的方式
本发明的核心思想是:将两个 RPR桥环相交的一个以上的跨环桥设 备组成保护组, 在保护组内确定一跨环桥设备为主用跨环桥设备, 其余 为备用跨环桥设备。主用跨环桥设备负责两个 RPR桥环之间数据才艮文的 转发; 而备用跨环桥设备只是在主用跨环桥设备失效时, 升级为主用跨 环桥设备继续负责两个 RPR桥环之间数据报文的转发。
这里,所述主用跨环桥设备负责两个 RPR桥环之间数据报文的转发 为: 主用跨环桥设备根据具体的设置, 负责全部报文的转发、 或具有共 同特征的部分数据报文的转发, 备用跨环桥设备不负责这部分数据报文 的转发。
由于主用跨环桥设备是否失效、 是否需要重新选择确定, 均可以通 过 RPR桥环的拓朴变化来反映。 由于 RPR桥环的拓朴发现以及拓朴收 敛仅需 50毫秒, 因此在 RPR桥环发生拓朴变化后, 利用 RPR桥环特有 的拓朴发现重新确定新的主用跨环桥设备的时间将小于 100亳秒。
因此, 在本发明中主用跨环桥设备和备用跨环桥设备均可以利用 RPR桥环特有的拓朴发现功能获知保护组内其他跨环桥设备的拓朴信 息, 使得在保护组发生拓朴变化时, 能够及时重新确定保护组内的主用 跨环桥设备。
为使本发明的目的、 技术方案及优点更加清楚明白, 以下参照附图 并举实施例, 对本发明做进一步的详细说明。
在保护组的每个跨环桥设备中新设置节点信息表, 节点信息表中至 少包括: 设备 ID、 设备优先级、 设备当前状态、 设备当前两个接口的 RPR MAC信息。 这里, 跨环桥设备之所以存在两个接口是由于跨环桥 设备连接了两个 RPR桥环,因此跨环桥设备具有两个接口用于分别连接 两个 RPR桥环。
这里, 设备优先级的设置可以根据需要自行配置, 可以设置数值小 的设备优先级高, 当然也可以设置数值大的设备优先级高。 另外, 当设 备优先级一致时, 则可以设备 ID的大小来确定设备优先级的高低。
如图 2所示, 当 RPR桥环发生拓朴变化, 保护组中的主用跨环桥设 备收到拓朴^ =艮文时, 执行以下步骤:
步骤 201: 主用跨环桥设备在收到拓朴报文之后, 重新计算当前的 拓朴结构, 并在拓朴收敛之后, 刷新自身存储的拓朴结构表。
具体来说, 由于主用跨环桥设备是同时位于两个 RPR桥环上, 因此 在主用跨环桥设备内同时存储了两个 RPR桥环的拓朴结构表。 如图 1 所示的网络拓朴结构中, 如果主用跨环桥设备收到了来自于 RPR桥环 1 的拓朴报文,则主用跨环桥设备则刷新自身存储的 RPR桥环 1的拓朴结 构表; 如果主用跨环桥设备收到了来自于 RPR桥环 2的拓朴报文, 则主 用跨环桥设备则刷新自身存储的 RPR桥环 2的拓朴结构表。
步骤 20^: 主用跨环桥设备判断自身的两个 RPR桥接口是否都具备 跨环转发能力, 如果是, 则执行步骤 203; 否则, 执行步骤 206。
这里, 判断自身的两个 RPR桥接口是否都具备跨环转发能力, 可以 是如下的方^,判断两个 RPR桥接口是否都可以正 ¾转发报文,如果均 可以正常转发报文, 则自身具备跨环转发能力; 否则, 不具备跨环转发 能力。
步驟 203: 查找自身存储的节点信息表, 判断在保护组内是否存在 优先级比自身高的跨环桥设备, 如果存在, 则执行步骤 204; 否则, 执 行步骤 205。
本步骤的判断需要在保护组内的所有节点进行, 不论该跨环桥设备 在此之前的状态是否为失效。 这样就可以保证不漏掉任何一个优先级高 的跨环桥设备。某些跨环桥设备由于链路故障或其他原因在 RPR桥环上 失效,但由于链路恢复,优先级高的跨环桥设备会重现出现在 RPR桥环 上, 具备充当主用跨环桥设备。
步骤 204: 判断比自身优先级高的跨环桥设备是否具备跨环转发的 能力, 如果具备, 则执行步驟 206; 否则, 执行步骤 205。
这里, 在保护组内比自身优先级高的跨环桥设备由于网络拓朴变化 的原因, 可能会存在一个以上比自身优先级高的跨环桥设备, 但只要存 在一个比自身优先级高的跨环桥设备具备跨环转发的能力, 则执行步骤 206。
其中, 判断比自身优先级高的跨环桥设备是否具备跨环转发能力的 方法可以采用如下方式。 首先假设比自身优先级高的跨环桥设备为设备 A, 分别在两个 RPR桥环上的 RPR桥接口为 RPR桥接口 A1和 RPR桥 接口 A2; 当前主用跨环桥设备为设备 B, 设备 B分别在两个 RPR桥环 上的接口分别为 RPR桥接口 B1和 RPR桥接口 B2。 所述判断比自身优 先级高的跨环桥设备是否具备跨环转发能力为: 判断设备 A的 RPR桥 接口 A1是否在 RPR桥环 1上与设备 B的 RPR桥接口 B1连通、同时设 备 A的 RPR桥接口 A2是否在 RPR桥环 2上与设备 B的 RPR桥接口 B2连通, 如果设备 A的 RPR桥接口 A1与设备 B的 RPR桥接口 B1连 通, 并且设备 A的 RPR桥接口 A2与设备 B的 RPR桥接口 B2连通, 则设备 A具有跨环转发能力。
这里,判断设备 A的 RPR桥接口 A1是否在 RPR桥环 1上与设备 B 的 RPR桥接口 B1连通为: 设备 B在自身 RPR桥环 1的拓朴信息表中 查找, 判断是否存在设备 A的 RPR桥接口 Al, 如果存在, 则设备 A的 RPR桥接口 A1在 RPR桥环 1上与设备 B的 RPR桥接口 B1连通; 否 则,设备 A的 RPR桥接口 A1在 RPR桥环 1上与设备 B的 RPR桥接口 B1不连通。判断设备 A的 RPR桥接口 A2是否在 RPR桥环 2上与设备 B的 RPR桥接口 B2连通, 也可以与 RPR桥接口 A1采用相同的方法, 在此不再详述。
步骤 205: 主用跨环桥设备结束当前处理。
本步骤表明, 在当前保护组内, 当前主用跨环桥设备仍处于良好的 工作状态 , 并且也不存在优先级比当前主用跨环桥设备高的跨环桥设备 具备跨环转发能力。
步骤 206: 主用跨环桥设备退出主用状态。
当主用跨环桥收到并处理拓朴报文的同时, 保护组内的各备用跨环 桥设备也会收到并处理拓朴报文, 具体处理的流程如图 3所示:
步骤 301: 备用跨环桥设备在收到拓朴报文之后, 重新计算当前的 拓朴结构, 并在拓朴收敛之后, 刷新自身存储的拓朴结构表。
具体刷新的方法, 与步骤 201中主用跨环桥设备刷新的方法相同, 在此不再详述。
步骤 302: 备用跨环桥设备判断自身的两个 RPR桥接口是否都具备 跨环转发能力, 如果是, 则执行步驟 303; 否则, 执行步骤 306。
这里, 具体判断的方法与步骤 202中的相同, 在此不再详述。 步骤 303: 查找自身存储的节点信息表, 判断在保护组内是否存在 优先级比自身高的跨环桥设备, 如果存在, 则执行步骤 304; 否则, 执 行步骤 305。
本步骤的判断需要在保护组的所有节点内进行, 不论跨环桥设备当 前状态是否为失效。
步骤 304: 判断比自身优先级高的跨环桥设备是否具备跨环转发的 能力, 如果具备, 则执行步骤 306; 否则, 执行步骤 305。
这里, 在保护组内比自身优先级高的跨环桥设备由于网络拓朴变化 的原因, 可能存在一个以上, 但只要存在一个比自身优先级高的跨环桥 设备具备跨环转发的能力, 则执行步骤 306。
其中, 所述判断比自身优先级高的跨环桥设备是否具备跨环转发能 力的方法可以采用与步骤 204中相同的方法。
步骤 305: 备用跨环桥设备升级为主用状态。
步骤 306: 备用跨环桥设备结束当前处理。
步骤 306表明, 在当前保护组内, 由于已经存在了优先级比自身高 的跨环桥设备具备跨环跨环转发能力, 因此自身不具备成为主用跨环桥 设备的条件。
总的来说, 图 2和图 3所示的流程都是为了在当前保护组所属的两 个 RPR环在发生拓朴变化时,保证保护组内当前的主用跨环桥设备是保 护组内优先级最高的跨环桥设备并且同时具备跨环转发能力。
在本发明所述的方法中还可以进一步设置等待时间 , 在主用跨环桥 设备准备退出主用状态, 即执行到步骤 204和 206之间, 以及备用跨环 桥设备准备升级为主用跨环桥设备, 即执行到步驟 304和 305之间, 主 用跨环桥设备和备用跨环桥设备等待设置的等待时间 , 确定当前保护组 内具备跨环转发能力、 并且优先级最高的跨环桥设备状态稳定时, 再执 行对应的步骤 206, 步驟 305; 否则, 执行对应的步骤 205, 步骤 306。 主用跨环桥设备和备用跨环桥设备还可以设置等待拓朴报文数, 即 跨环桥设备在各自等待了设置的等待拓朴报文数后, 当前保护组内具备 跨环转发能力、 并且优先级最高的跨环桥设备状态仍然稳定后, 再执行 相应的操作。
保护组中的各跨环桥设备通过接收拓朴报文, 可以感知是否在保护 组内增加了新的跨环桥设备、 或者删除了跨环桥设备。 但是, 保护组中 可以通过在保护组内增加一种新的控制报文, 用于在保护组内传递各跨 环桥设备的状态。该控制报文中至少携带本跨环桥设备的设备 ID、设备 优先级、 设备当前状态、 设备当前两个接口的 RPR MAC信息, 这里, 也将控制报文中携带的信息称为设备的保护组信息。 当跨环桥设备保护 组信息发生变化时, 就通过在保护组内广播发送控制报文向保护组内的 其他设备通知自身状态的改变。 保护组内各跨环桥设备的节点信息表则 可以根据接收到的其他跨环桥设备发送的控制报文、 以及自身当前的状 态进行更新, 具体为: 节点信息表非本节点的保护组信息根据收到的控 制报文进行更新, 而本节点自身的保护组信息则根据自身的配置, 以及 根据当前 RPR桥环拓朴计算得到的当前自身的主备用状态进行更新。
例如,保护组内的一台跨环桥设备由于某些原因自身的优先级降低, 如人为设置。 则当该跨环桥设备优先级降低之后, 立即向保护组内的其 他跨环桥设备广播发送控制报文, 其中携带变化后的保护组信息。 保护 组内的其他设备则会根据接收到的保护组信息更新自身的节点状态信 息表, 并进行相应处理。 主用跨环桥设备具体处理过程与图 2相同, 备 用跨环桥设备的处理过程与图 3相同, 在此不在详述。 控制报文不仅可以在跨环桥设备的优先级发生变化时, 广播发送保 护组内其他跨环桥设备; 还可以在自身主备用状态发生广播发送至其他 跨环桥设备。 这里, 主备用状态发生可以是由于拓朴变换而导致的主备 用状态变化, 也可以是由人为配置等其他因素而发生的变化。
另外, 控制报文不仅可以在跨环桥设备的保护组信息发生变化时广 播发送保护组内其他设备, 还可以周期性的发送。 在周期性发送的情况 下, 每当收到控制报文时, 主用跨环桥设备均执行图 2所示的流程; 备 用跨环桥设备均执行图 3所示的流程。
在保护组内跨环桥设备周期性发送控制报文的情况下, 还可以设置 为主用状态的备用跨环桥设备在各自等待了设置的等待控制报文数后, 当前保护组内具备跨环转发能力、 并且优先級最高的跨环桥设备状态仍 然稳定时, 在执行相应的操作。
在上面的介绍中, 均是介绍由两个 RPR桥环组成一个保护组的情 况。 在实际的组网中, 通常的情况是一个跨环桥设备属于多个保护组。 此时, 则需要在各跨环桥设备的节点状态信息表中增加一项内容, 即组 ID, 用于标示跨环桥设备属于哪两个 RPR桥环组成的保护组; 相应, 在 控制报文中也需增加相应的组 ID内容。
以上所述, 仅为本发明较佳的具体实施方式, 但本发明的保护范围 并不局限于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范 围内, 可轻易想到的变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护范围应该以权利要求的保护范围为准。

Claims

权利要求书
1、 一种桥模式弹性分组环冗余保护的方法, 其特征在于, 设置各跨 环桥设备的优先级;由同时位于两个弹性分组数据环 RPR桥环的一个以 上跨环桥设备组成保护組 , 设置保护组内一跨环桥设备为主用跨环桥设 备, 负责转发报文, 其他为备用跨环桥设备; 当保护组发生变化时, 执 行以下步骤:
A、 确定具有跨环转发能力的优先级最高的跨环桥设备为主用跨环 桥设备。
2、根据权利要求 1所述的方法, 其特征在于, 所述保护组发生变化 为: 所述保护组所在 RPR桥环的拓朴结构发生变化。
3、根据权利要求 1所述的方法, 其特征在于, 各跨环桥设备分别设 置用于保存保护组内各跨环桥设备保护组信息的节点信息表。
4、根据权利要求 3所述的方法, 其特征在于, 所述保护组发生变化 为: 保护组内跨环桥设备的保护组信息发生变化。
5、根据权利要求 4所述的方法, 其特征在于, 设置控制报文, 当保 护組信息发生变化时, 保护组信息发生变化的跨环桥设备向保护组内广 播发送控制报文, 其中携带自身的保护组信息; 其他各跨环桥设备收到 控制报文时, 执行所述步骤 A。
6、 根据权利要求 1所述的方法, 其特征在于, 所述步骤 A为: 当主用跨环桥设备不具备跨环转发能力、 或保护组内存在优先级比 自身高的具备跨环转发能力的跨环桥设备时, 所述主用跨环桥设备退出 主用状态;
同时, 当备用跨环桥设备具备跨环转发能力、 并且保护组内不存在 优先级比自身高的具备跨环转发能力的跨环桥设备时, 所述备用跨环桥 设备升级为主用跨环桥设备。
7、根据权利要求 6所述的方法, 其特征在于, 所述主用跨环桥设备 退出主用状态, 包括以下步骤:
Al l、 主用跨环桥设备判断自身是否具备跨环转发能力, 如果是, 则执行步骤 A12; 否则, 退出主用状态;
A12、 主用跨环桥设备判断保护组内是否存在优先级比自身高的具 备跨环转发能力的跨环桥设备, 当保护组内存在优先级比自身高的具备 跨环转发能力的跨环桥设备, 所述主用跨环桥设备退出主用状态。
8、根据权利要求 6所述的方法, 其特征在于, 所述备用跨环桥设备 升级为主用跨环桥设备, 包括以下步骤:
A21、 备用跨环桥设备判断自身是否具备跨环转发能力, 当自身具 备跨环转发能力时, 则执行步骤 A22;
A22、 判断保护组内是否存在优先级比自身高的具备跨环转发能力 的跨环桥设备, 当保护组内不存在优先级比自身高的具备跨环转发能力 的跨环桥设备时, 所述备用跨环桥设备升级为主用跨环桥设备。
9、根据权利要求 Ί或 8所述的方法, 其特征在于, 所述判断自身的 是否具备跨环转发能力为:
判断自身的两个 RPR桥接口是否均正常工作, 如果是, 则自身具备 跨环转发能力; 否则, 不具备跨环转发能力。
10、 根据权利要求 7所述的方法, 其特征在于, 步骤 A12中, 所述 主用跨环桥设备判断保护组内是否存在优先级比自身高的具备跨环转 发能力的跨环桥设备为:
A121、 判断保护組内是否存在比自身优先级高的跨环桥设备, 当保 护组内存在比自身优先级高的跨环桥设备, 执行步骤 A122;
A122、 判断比自身优先级高的跨环桥设备是否具备跨环转发能力, 当比自身优先级高的跨环桥设备是否具备跨环转发能力, 所述主用跨环 桥设备退出主用状态。
11、 根据权利要求 8所述的方法, 其特征在于, 步骤 A22中, 所述 备用跨环桥设备判断保护组内是否存在优先级比自身高的具备跨环转 发能力的跨环桥设备为:
A221、 判断保护组内是否存在比自身优先级高的跨环桥设备, 如果 存在, 则执行步骤 A222; 否则, 升级为主用跨环桥设备;
A222, 判断比自身优先级高的跨环桥设备是否具备跨环转发能力, 当比自身优先级高的跨环桥设备不具备跨环转发能力时, 所述备用跨环 转发设备升级为主用跨环桥设备。
12、 根据权利要求 10或 11所述的方法, 其特征在于, 各跨环桥设 备分别设置, 用于至少保存保护组内各跨环桥设备优先级信息的节点信 息表;
所述判断保护组内是否存在比自身优先级高的跨环桥设备为: 查找 自身设置的节点信息表, 根据节点信息表的记录, 执行所述判断保护组 内是否存在比自身优先级高的跨环桥设备。
13、 根槔权利要求 10或 11所述的方法, 其特征在于, 判断比自身 优先级高的跨环桥设备是否具备跨环转发能力为: 判断比自身优先级高 的跨环桥设备的两个 RPR桥接口是否与自身的两个 RPR桥接口分别在 两个 RPR桥环上连通,
如果是,. 则所述跨环桥设备具备跨环转发能力; 否则, 则所述跨环 桥设备不具备跨环转发能力。
14、根据权利要求 13所述的方法,其特征在于,该方法进一步包括, 各跨环桥设备刷新自身的拓朴结构表;
所述判断比自身优先级高的跨环桥设备的两个 RPR桥接口是否与 自身的两个 RPR桥接口分别在两个 RPR桥环上连通为: 判断比自身优 先级高的跨环桥设备的两个 RPR桥接口是否分别存在于对应的自身所 属的两个 RPR环的拓朴结构表中,
如果是,则所述比自身优先级高的跨环桥设备的两个 RPR桥接口与 自身的两个 RPR桥接口分别在两个 RPR桥环上连通; 否则, 所述比自 身优先级高的跨环桥设备的两个 RPR桥接口不与自身的两个 RPR桥接 口分别在两个 RPR桥环上连通。
15、根据权利要求 3、 4或 5所述的方法, 其特征在于, 所述保护組 信息至少包括为: 跨环桥设备优先级信息、 主备用状态。
16、 根据权利要求 1、 2、 3、 4、 5、 6、 7、 8、 10或 11所述的方法, 其特征在于,所述主用跨环桥设备负责转发报文为: 负责转发全部报文、 或转发具有共同特征的部分^ :艮文。
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