WO2008106874A1 - Procédé et système de correction de fautes à deux nœuds pour rpr à double boucle d'espacement - Google Patents

Procédé et système de correction de fautes à deux nœuds pour rpr à double boucle d'espacement Download PDF

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Publication number
WO2008106874A1
WO2008106874A1 PCT/CN2008/070224 CN2008070224W WO2008106874A1 WO 2008106874 A1 WO2008106874 A1 WO 2008106874A1 CN 2008070224 W CN2008070224 W CN 2008070224W WO 2008106874 A1 WO2008106874 A1 WO 2008106874A1
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WO
WIPO (PCT)
Prior art keywords
cross
ring
fault
node
state
Prior art date
Application number
PCT/CN2008/070224
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English (en)
Chinese (zh)
Inventor
Suping Zhai
Yan Wang
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Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008106874A1 publication Critical patent/WO2008106874A1/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
    • H04L12/437—Ring fault isolation or reconfiguration
    • 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]
    • H04L12/46—Interconnection of networks

Definitions

  • a resilient packet ring is a packet ring network technology used as an access/aggregation bearer network in a metropolitan area network. From the network point of view, its characteristics are: Double-loop structure can achieve carrier-class 50ms traffic protection; Provide 2. 5G, 10G optical port; is a link layer protocol, compatible with 802.1 D/Q bridge.
  • the RPR device From the perspective of the RPR device, its main features are: support unicast/multicast/broadcast address; support multiple quality of service (QoS, Qua ty of Service) for different services; use flexible two-way, one-way transmission, And link/node failure wraparound, evasion mechanism, bandwidth on the ring can be effectively utilized; support fair algorithm to ensure that burst traffic does not occupy normal traffic bandwidth; topology automatic discovery mechanism guarantees plug-and-play function of RPR site, no need Manual configuration; support for operation and maintenance (0AM, Opera t ion and Management).
  • the RPR shown in Figure 1 is a reverse double-loop topology.
  • the outer ring is the Outer Ring and the inner ring is the Inner Ring. Both the outer ring and the inner ring transmit data packets and control packets.
  • RPR technology has promoted the use of RPR technology as a packet network technology for metropolitan area networks in actual networking.
  • the use of ring networking can save fiber, which is very practical in situations where the number of users is not large or the network size is not very large.
  • the need for RPR cross-ring applications has gradually emerged during use.
  • a typical application scenario is a cross-ring networking scheme for access rings and aggregation rings.
  • the RPR device at the ring intersection is called a cross-ring node, as shown in Figure 2, the cross-ring node 1 and the cross-ring node 2
  • the RPR device that is not at the ring intersection is called a non-cross-ring node, as shown in Figure 2 for non-cross-ring node 1, non-cross-ring node 1, non-cross-ring node 3, and non-cross-ring node 4.
  • the existing RPR cross-ring schemes include the following three: RVR cross-ring scheme based on virtual tuvian VLAN (Virtual Tua l Loca l Area Network) or specific RPR domain, time-to-live (TTL)-based RPR cross-ring scheme , and Hash-based Hash-based RPR cross-ring scheme.
  • RVR cross-ring scheme based on virtual tuvian VLAN (Virtual Tua l Loca l Area Network) or specific RPR domain
  • TTL time-to-live
  • Hash-based Hash-based RPR cross-ring scheme has at least the following problems: As shown in FIG.
  • the technical problem to be solved by the embodiments of the present invention is to provide a cross-ring RPR two-point fault processing method and system, which are used to simultaneously generate two fault points on one RPR ring, wherein one fault point is located in two A traffic protection mechanism is provided between the cross-ring nodes, and then, when one of the fault points is recovered, the loop is effectively avoided.
  • a cross-ring RPR two-point fault processing method comprising:
  • Two resilient packet ring RPRs intersect at two cross-ring nodes. When two fault points occur on one of the RPR rings, one fault point is located between the two cross-ring nodes, and the cross-ring node performs State switching to protect the ring and cross-ring traffic;
  • the non-cross-ring node adjacent to the fault recovery point notifies the cross-ring node that the fault has been recovered
  • the cross-ring node senses the switching operation state after the fault is recovered, and after the working state is switched, notifying the non-cross-ring node state switching of the fault recovery point is completed;
  • the non-cross-ring node adjacent to the fault recovery point restores the working state to a normal state.
  • the embodiment of the present invention further provides a cross-ring RPR two-point fault processing system, which is applied to two Elastic packet ring RPR, and the two RPR rings intersect at two cross-ring nodes.
  • the system includes:
  • the cross-ring node is configured to perform state switching to protect the local ring and the cross-ring traffic when the two-point fault occurs; and after detecting failure of one of the fault points, switch the working state, and after the working state is switched, Notifying that the state of the non-cross-ring node adjacent to the fault recovery point is switched;
  • the non-cross-ring node is configured to notify the cross-ring node that the fault has been recovered after the fault of the adjacent fault point is recovered; and return the working state to the normal state according to the state switching completion notification of the cross-ring node. .
  • FIG. 1 is a schematic structural diagram of a single RPR ring networking in the prior art
  • FIG. 2 is a schematic diagram of communication of a cross-ring RPR network in the prior art
  • FIG. 3 is a schematic diagram of a two-point failure of a cross-ring RPR occurring at the same time according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of an RPR cross-ring scheme based on a VLAN or a specific RPR domain according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a loop generated when a fault occurs in the case where two faults occur simultaneously in the embodiment of the present invention
  • FIG. 6 is a flowchart of a fault processing according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION
  • the traffic protection mechanism provided by the embodiment of the present invention is: Two cross-ring nodes perform state switching to protect the traffic of the ring and the ring.
  • the loop avoidance mechanism provided by the embodiment of the present invention is: the non-cross-ring node adjacent to the fault recovery point notifies the cross-ring node that the fault has been recovered, and the cross-ring node senses that the fault is recovered after the switchover.
  • Working state after the working state is switched, the sending status is completed after the confirmation is completed.
  • the non-cross-ring node adjacent to the fault recovery point receives the status switching completion confirmation, the original fault protection status (Wrap or s teer ing) ) Revert to normal forwarding state.
  • the adjacent RPR node of the fault recovery point is a cross-ring node
  • the cross-ring node can perceive the fault recovery and then initiate the state switch.
  • the nodes at both ends of the fault recovery point are cross-ring nodes and non-cross-ring nodes
  • the non-cross-ring node notifies another cross-ring node, that is, a cross-ring node that is not adjacent to the fault recovery point. The fault has been restored.
  • Embodiment 1 A fault handling method of an RPR cross-ring scheme based on a VLAN or a specific RPR domain.
  • this embodiment first introduces an RPR cross-ring scheme based on a VLAN or a specific RPR domain.
  • traffic is classified into different protection groups according to different services according to VLANs or specific RPR domains, such as Group1 and Group2.
  • the cross-ring node CI is responsible for cross-ring forwarding.
  • the cross-ring node C2 is responsible for cross-ring forwarding.
  • the formation of the loop is avoided, because the same traffic can only be forwarded from one of the cross-ring nodes to the other ring, and does not return from the other cross-ring node to the original ring;
  • Load sharing can reduce the processing power requirements of cross-ring nodes.
  • the operation is as follows:
  • the two cross-ring nodes perform state switching to protect the traffic of this ring and the cross-ring.
  • the present embodiment takes the failure point recovery between the non-cross-ring node 1 and the non-cross-ring node 2 as an example. At this time, the non-cross-ring node 1 and the non-cross-ring node 2 can be quickly perceived, has been implemented in the RPR protocol, and will not be described here. Because cross-ring node 1 and cross-ring node 2 are still responsible for forwarding all messages, there is a loop across the ring. To avoid the occurrence of a cross-ring loop as shown in FIG. 5, the loop avoidance mechanism provided by the embodiment of the present invention is:
  • the non-cross-ring node adjacent to the fault recovery point can notify the cross-ring node that the fault has been recovered by sending a fault recovery notification message.
  • the non-cross-ring node 1 and the non-cross-ring node 2 adjacent to the fault recovery point respectively send a failure recovery notification message, where the packet is a broadcast packet, which may be extended based on the existing RPR control packet. Or use the newly defined RPR control message.
  • the cross-ring node switches the working state, and after the working state is switched, the state of the non-cross-ring node cross-ring node adjacent to the fault recovery point is notified that the state of the cross-ring node has been switched. Specifically, when the cross-ring node is adjacent to the fault recovery point, the fault recovery may be perceived by itself. When the cross-ring node is not adjacent to the fault recovery point, the fault is sent according to the non-cross-ring node adjacent to the fault recovery point. The recovery notification packet senses the fault recovery, and then switches the working state across the ring node, and the working state is switched.
  • the status of the non-cross-ring node cross-ring node adjacent to the fault recovery point can be notified by sending a status switch completion confirmation message.
  • This embodiment is based on a VLAN or a specific RPR domain RPR cross-ring scheme. Compared with the same protection group, after the state switchover, the final state of the two cross-ring nodes is a master and a standby under normal conditions, see Figure 3.
  • the cross-ring node RI 1 is in the active state
  • the cross-ring node RI2 is in the standby state.
  • the traffic of the protection group is only forwarded by the cross-ring node RI 1 , and the cross-ring node R 12 is no longer responsible. Forwarding traffic of this protection group does not form a loop.
  • the status switching completion acknowledgement packet is a broadcast packet, and may be extended on the basis of the existing RPR control packet, or the newly defined RPR control packet may be used.
  • the status confirmation completion message may be sent once or more. If it is specified to be sent three times in a cycle at a certain time interval.
  • the nodes adjacent to the fault recovery point are non-cross-ring nodes, as shown in Figure 3, RB1 and RB2.
  • the cross-ring node receives the neighboring from the fault recovery point.
  • the state switch is started; if it is the failure point recovery between the cross-ring nodes, as shown in RI 1 and RI 2 in Figure 3, the two cross-ring nodes can sense the fault. Point recovery, and then start the state switch of the cross-ring node, at this time, the two cross-ring nodes do not need to send the failure recovery notification message.
  • Embodiment 2 A fault processing method of a Hash-based RPR cross-ring scheme.
  • this embodiment first introduces the RPR cross-ring scheme based on Ha sh.
  • Two cross-ring nodes form a protection group, and the protection group configures member 0 and member 1.
  • Member 0 is only responsible for forwarding data traffic with a Hash value of 0.
  • Member 1 is only responsible for forwarding data traffic with a Ha sh value of 1.
  • the Hash calculation is calculated on a per-flow basis, that is, the Hash value is obtained by using a certain algorithm for a specific domain of each message. This solution can also solve the loop problem of the cross-ring and implement load sharing.
  • the processing flow is the same as that in the first embodiment, except that the identification of the state of the cross-ring node is different. That is, when two points of failure occur simultaneously, the two cross-ring nodes in the first embodiment are used by a primary one under normal conditions. The state and the standby state are all switched to the active state. The two cross-ring nodes in this embodiment are switched from the normal 0 or 1 state to the 0/1 state, that is, regardless of the Ha sh value is 0 or 1. The cross-ring nodes forward all the packets. Similarly, after one of the faults is recovered, the two cross-ring nodes in this embodiment are switched from the 0/1 state to the normal state, one of which is in the 0 state and one in the 1 state.
  • Embodiment 3 A fault processing method for a TTL-based RPR cross-ring scheme.
  • this embodiment first introduces a TTL-based RPR cross-ring scheme.
  • TTL The value of TTL determines the maximum number of hops that a data frame is forwarded on the RPR ring. Each time a node passes, the TTL value is decremented by one, when TTL is effective to avoid loops. Referring to FIG. 2, if the TTL of the cross-ring traffic forwarded from the cross-ring node 1 is set to 1, the TTL of the cross-ring traffic forwarded from the cross-ring node 2 is also set to 1, and load balancing can also be implemented.
  • the processing flow is the same as that in the first embodiment, except that the identification of the state of the cross-ring node is different.
  • the state of the cross-ring node includes the whole-loop forwarding state and the TTL-average forwarding state.
  • the TTL value is the total number of the local ring nodes minus 1, and the packet is sent to the ring.
  • the TTL value is set on the two cross-ring nodes to satisfy the sum of the TTL values of the two cross-ring nodes minus the total number of the ring nodes minus 1, so that the packet is sent. Go to all nodes on this ring.
  • the two cross-ring nodes in the first embodiment are switched from the active state and the standby state in the normal state to the active state.
  • the two cross-ring nodes in this embodiment are Under normal circumstances, the TTL average forwarding state is switched to the full-loop forwarding state, so that the packets forwarded from the cross-ring node can reach all the nodes on the ring.
  • the two cross-ring nodes in this embodiment are switched from the full-loop forwarding state to the TTL-average forwarding state in the normal case.
  • the embodiment of the present invention further provides a cross-ring RPR two-point fault processing system, which is applied to two resilient packet ring RPRs, and two RPR rings intersect at two cross-ring nodes, and one of the RPR rings simultaneously appears.
  • the system specifically includes: a cross-ring node, configured to perform state switching to protect the ring and the cross-ring when the two points of the fault occur. After the failure of one of the fault points is detected, the working state is switched, and after the working state is switched, the state of the non-cross-ring node adjacent to the fault recovery point is notified to be switched;
  • the non-cross-ring node is configured to notify the cross-ring node that the fault has been recovered after the fault of the adjacent fault point is recovered; and return the working state to the normal state according to the state switching completion notification of the cross-ring node.
  • the cross-ring node senses that the fault has been recovered, completes the state switch, and notifies the non-cross-ring node of the fault recovery point that the state transition is completed, and the non-cross-loop node adjacent to the fault recovery point is up to After receiving the notification, the normal forwarding state is restored, and the loop can be effectively avoided.
  • the method disclosed in the embodiment of the present invention is applicable to three RPR cross-ring solutions, namely: an RPR cross-ring scheme based on a VLAN or a specific RPR domain, a TTL-based RPR cross-ring scheme, and a Ha sh-based RPR cross-ring scheme. , can provide a unified processing method for three different RPR cross-ring schemes.

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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 et un système de correction de faute à deux nœuds pour RPR à double boucle d'espacement, qui relèvent du domaine des communications en réseau. Le procédé comprend : une intersection à deux anneaux de protection résilients entre les deux nœuds, lorsque deux nœuds défectueux apparaissent sur une boucle des deux boucles RPR ; lorsque la faute d'un nœud défectueux est corrigée, le nœud sans boucle d'espacement adjacent au nœud dont la faute a été corrigée notifie le nœud à boucle d'espacement que la faute a été corrigée ; le nœud à boucle d'espacement change de mode de fonctionnement après avoir perçu que la faute a été corrigée ; après avoir changé de mode de fonctionnement, il notifie le nœud sans boucle d'espacement adjacent au nœud dont la faute a été corrigée de ce changement d'état ; le nœud sans boucle d'espacement adjacent au nœud dont la faute a été corrigée amène l'état de fonctionnement à revenir à la normale. Le système comprend : un nœud à boucle d'espacement et un nœud sans boucle d'espacement. Ce procédé et ce système peuvent constituer un mécanisme de protection de flux lorsque deux noeuds défectueux se produisent en même temps ; ainsi, lorsque la fautesur un nœud est corrigée, il est possible d'éviter un circuit en boucle.
PCT/CN2008/070224 2007-03-08 2008-01-31 Procédé et système de correction de fautes à deux nœuds pour rpr à double boucle d'espacement WO2008106874A1 (fr)

Applications Claiming Priority (2)

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CN2007100734626A CN101262399B (zh) 2007-03-08 2007-03-08 一种跨环rpr两点故障处理方法及系统
CN200710073462.6 2007-03-08

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CN102739432A (zh) * 2011-03-30 2012-10-17 中兴通讯股份有限公司 跨环业务的传输方法和系统
CN102209035B (zh) * 2011-05-25 2014-10-15 杭州华三通信技术有限公司 流量转发方法及转发设备
CN102868620B (zh) * 2011-07-06 2018-07-06 中兴通讯股份有限公司 跨环业务保护方法及装置
CN103684955B (zh) * 2013-12-18 2017-04-26 华为技术有限公司 环网中发生故障时路径确定方法、装置以及系统
CN104283790B (zh) * 2014-10-09 2017-09-15 新华三技术有限公司 Sdn中弹性分组环rpr的拓扑发现方法和设备
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

Citations (2)

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Publication number Priority date Publication date Assignee Title
CN1292956A (zh) * 1998-04-27 2001-04-25 德纳克公司 用于管理动态同步传输模式双环拓扑上的故障的方法
CN1412977A (zh) * 2001-10-10 2003-04-23 阿尔卡塔尔公司 在rpr网中传播故障信息的方法及相应rpr数据包

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1292956A (zh) * 1998-04-27 2001-04-25 德纳克公司 用于管理动态同步传输模式双环拓扑上的故障的方法
CN1412977A (zh) * 2001-10-10 2003-04-23 阿尔卡塔尔公司 在rpr网中传播故障信息的方法及相应rpr数据包

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CN101262399B (zh) 2011-09-14

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