WO2011017900A1 - Procédé de protection de segment et système pour tunnel ethernet - Google Patents

Procédé de protection de segment et système pour tunnel ethernet Download PDF

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Publication number
WO2011017900A1
WO2011017900A1 PCT/CN2009/076287 CN2009076287W WO2011017900A1 WO 2011017900 A1 WO2011017900 A1 WO 2011017900A1 CN 2009076287 W CN2009076287 W CN 2009076287W WO 2011017900 A1 WO2011017900 A1 WO 2011017900A1
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WO
WIPO (PCT)
Prior art keywords
protection
segment
bpt
ipg
port
Prior art date
Application number
PCT/CN2009/076287
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English (en)
Chinese (zh)
Inventor
敖婷
Original Assignee
中兴通讯股份有限公司
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
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Publication of WO2011017900A1 publication Critical patent/WO2011017900A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/12—Avoiding congestion; Recovering from congestion
    • H04L47/125—Avoiding congestion; Recovering from congestion by balancing the load, e.g. traffic engineering
    • 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
    • H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/35—Switches specially adapted for specific applications
    • H04L49/351—Switches specially adapted for specific applications for local area network [LAN], e.g. Ethernet switches

Definitions

  • the present invention relates to the field of data communications, and in particular, to an Ethernet tunnel segmentation protection method and system. Background technique
  • the protection object of the PBB-TE end-to-end protection is TESI.
  • the user message entering the PBB-TE tunnel needs to be re-encapsulated with another protection TESI to let the traffic Take the protection of the PBB-TE tunnel.
  • link and node protection are part of Ethernet protection.
  • PBB-TE segmentation protection becomes more urgent.
  • a number of operators have proposed a segmentation protection requirement for PBB-TE, that is, a section of the PBB-TE tunnel is specially configured with a protection segment to protect this segment.
  • the current general practice is 1: 1 PBB.
  • a protection group has a working segment and a protection segment.
  • all of the PBB-TE segment protection groups The protected traffic is forwarded from the working segment.
  • the PB-TE segment protection zone endpoint SEB Segment Edge Bridge
  • the egress port of the forwarding table corresponding to the TESI protected by the protection zone is modified to be the egress port corresponding to the protection segment, so that the traffic is switched to the protection segment, thereby realizing the protection of the working segment, ensuring normal forwarding of network traffic, and improving The reliability of the network.
  • the 1:1 protection of the package is not enough.
  • the PBB-TE of M:l can be introduced for the link part that is particularly important. Segment protection, that is, in a M:l PBB-TE segment protection group, there is a working segment and M protection segments, and M protection segments protect a working segment, further improving the reliability of the system.
  • the M protection segments will also be link members of other PBB-TE segment protection groups: it may be the working segment of other PBB-TE segment protection groups, or it may be other
  • the PBB-TE segment protects the protection segments of the group, so they may also carry other traffic. If all the traffic on the working segment is switched to one of the protection segments after the working segment of the PBB-TE segment protection group of the M:1 fails, the traffic on the protection segment may be too large and cause congestion. Therefore, the traffic can be distributed to different M protection segments when the work segment is faulty.
  • the main purpose of the present invention is to provide a method and system for load balancing of Ethernet tunnel segmentation protection, which is used to solve technical problems such as traffic congestion caused by network traffic bursts, and the present invention implements PBB-TE.
  • load sharing is implemented when traffic is switched to the protection segment.
  • An Ethernet tunnel segmentation protection method includes:
  • the BPT table is queried to obtain an alternate egress port of each TESI, and the egress port of the corresponding entry in the forwarding table is updated to the alternate egress port obtained by querying the BPT table. , thus achieving IPG traffic switching.
  • each TSI protected by the IPG corresponds to a different set of standby egress ports, the different standby egress ports are set with different priorities, and the spare egress ports with high priority are in the When the IPG switches to the protection segment, it is preferentially selected.
  • the method for updating the egress port of the corresponding entry in the forwarding table to the alternate egress port obtained by querying the BPT table is specifically:
  • the SEB of the IPG When the SEB of the IPG detects that the working segment is faulty and needs to be switched, the SEB first queries the BPT, traverses each TESI protected by the IPG, and finds the highest priority standby corresponding to each TESI. Port, and then replace the egress port of each TESI corresponding forwarding table entry.
  • the method further includes: a processing step of the backup port corresponding to the protection segment in the BPT table, specifically:
  • the value of the standby out port is reduced to the lowest value or restored to the original value by inverting the priority of the spare out port.
  • the present invention further provides an Ethernet tunnel segmentation protection system, including: a configuration module, is used for carrier backbone bridge support (PBB-TE) supporting traffic engineering with multiple protection segments and one working segment.
  • IPG IPG
  • SEB protection domain endpoint
  • BPT backup port table
  • TESI traffic engineering service instance
  • a switching module configured to query the BPT to obtain an alternate egress port when the traffic protected by the IPG is switched to the protection segment, and update an egress port of the corresponding entry in the forwarding table to an alternate egress port obtained by querying the BPT table; Performing the IPG to switch to the protection segment.
  • the configuration module allocates different standby outgoing ports for each of the BPTs that are protected by the IPG, and sets different priorities for different standby outgoing ports; the switching module updates the forwarding table. When the egress port of the corresponding entry is selected, the alternate egress port with the highest priority is preferentially selected.
  • the switching module includes:
  • the switching detection module is configured to detect whether the working segment is faulty, and if yes, notify the forwarding table to refresh the module;
  • a forwarding table refreshing module configured to: when the working segment is faulty, traverse each TSI in the BPT that is protected by the IPG, find an alternate outbound port with the highest priority corresponding to each TESI, and then replace each TESI corresponding Outbound port of the forwarding table entry;
  • the switching execution module is configured to perform traffic switching according to the forwarding table.
  • the switching module further includes:
  • a link priority monitoring module configured to: when a certain protection segment of the IPG is faulty, reduce a priority of the standby outbound port corresponding to the protection segment in the BPT table to a minimum for each TESI; And returning the priority of the spare egress port corresponding to the protection segment in the BPT table to the original value when the faulty protection segment returns to normal.
  • the link priority monitoring module reduces its value to the lowest value or restores the original value by inverting the priority of the standby outgoing port.
  • the network can still be guaranteed in the case of failure of multiple links.
  • the normal operation of the network thus greatly improving the reliability of the network; since each IPG is configured with a backup port table BPT, different priority ports of different TESIs in each BPT can be set, so when the IPG is switched, The traffic can be switched to different protection segments to implement load sharing in the protection segment.
  • the BPT configured for the IPG contains the information of the TESI protected by the IPG, it can be protected against a group of TESIs. It overcomes the disadvantages of switching all the passed TESIs during the link protection during handover, thereby improving the flexibility of network configuration and protection.
  • FIG. 1 is a schematic diagram of a PBB-TE segmentation protection method in the prior art
  • FIG. 2 is a schematic diagram of a flow rate according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of traffic switching after a working segment fails in the embodiment of the present invention
  • FIG. 4 is a schematic diagram of a BPT table configured in an embodiment of the present invention
  • FIG. 5 is a flowchart of querying a BPT after a fault occurs in a working segment according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a fault in a protection segment according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a BPT table after a certain protection segment fails in the embodiment of the present invention
  • FIG. 8 is a logical structural diagram of the system according to the present invention. detailed description
  • IPG PBB-TE Segment Protection Group
  • the traffic protected by this IPG is TESI1, TESI2, TESI3, TESI4.
  • TESI1, TESI2 and TESI3, TESI4 are protected by the IPG.
  • TESI1 and TESI2 are switched to protection segment 1
  • TESI3 and TESI4 are switched to protection segment 2.
  • the working segment in the present invention refers to a segment in which the traffic passes when the segment does not detect the occurrence of the fault
  • the protection segment refers to a segment that carries traffic after detecting the failure of the working segment or the switching of the management command that receives the handover
  • the segment It refers to a network link consisting of a local area network (LAN) and a bridge between a series of carrier network ports (PNPs) and PNP ports.
  • LAN local area network
  • PNPs carrier network ports
  • a BPT table (Backup Port Table) is configured for the IPG in the network planning configuration.
  • each corresponding IPSI protected TESI is configured with a different backup.
  • Different priorities of the outgoing ports are different.
  • the BPT table is as shown in FIG. 4, that is, each TSI protected by the IPG corresponds to a different standby egress port, and the priority of each spare egress port is different, for example, TESI1 corresponds to the alternate egress port 2 priority.
  • the level is P1
  • TESI1 corresponds to the standby outgoing port 3 with priority P2, where P1 priority is higher than P2 priority.
  • TESI1, TESI2, TESI3, and TESI4 all go through the working segment.
  • SEB1 and SEB2 detect a failure on the working segment, an action is performed to switch the traffic to the protection segment (the mapDataToProtection process).
  • the SEB of the present invention is used for the two endpoints of the terminating segment.
  • the SEB may be a Backbone Edge Bridge (BEB) device in the PBB-TE network, or may be a Backbone Core Bridge. BCB) equipment.
  • BEB Backbone Edge Bridge
  • BCB Backbone Core Bridge
  • the IPG traffic switching refers to redirecting a group of TESI traffic protected by the IPG from a walking working segment to a walking protection segment, or from a walking protection segment to a walking working segment. The redirection is implemented by modifying the egress port corresponding to the corresponding entry in the forwarding table.
  • FIG. 5 is a flowchart of steps for implementing IPG traffic switching according to the present invention. The specific steps are as follows: Step 101: Obtain a record from a BPT table, where the record includes TESI as shown in FIG. The identifier and the priority of the corresponding outgoing port;
  • Step 102 Query, according to the TESI identifier, an alternate outbound port with the highest priority corresponding to each TESI;
  • Step 103 Update the forwarding table, and update the egress port in each forwarding entry corresponding to the IPG-protected TESI in the forwarding table to the standby with the highest priority corresponding to the TESI found in the BPT table. port.
  • Step 104 Determine whether the BPT table traversal is completed. If not, go to step 101; otherwise, end the processing of mapDataToProtection and protect the switching action.
  • the protection segment to which the standby egress port belongs is guaranteed to be fault-free. If the status of the egress port is determined after querying an alternate egress port in the BPT table, the speed of the handover will be reduced. In particular, if the status of the port indicates that the link to which the link belongs has failed, You need to re-query the BPT table to find the next available spare port. This will greatly reduce the switching speed and affect the performance of the network.
  • the present invention also provides a method for improving the BPT lookup table speed and optimizing the protection switching performance, that is, in the process of checking the table, the state of the spare out port that is queried is not judged one by one.
  • the SEB detects the failure of the protection segment, and then modifies the BPT table, and reduces all priorities of the backup port corresponding to the protection segment in the BPT table, for example, The priority is reversed.
  • the BPT table is modified again, and all the priority ports of the standby egress port corresponding to the protection segment are reversed again, that is, after the protection segment recovers from the failure, the BPR table is restored.
  • Original priority Therefore, it is guaranteed that the alternate outgoing port that has failed will not be selected when the alternate outgoing port is selected during the traffic switching process.
  • the standby port can participate in the selection process according to the priority of the previously set standby port after the fault is recovered.
  • the BPT of the IPG to which it belongs is The table is shown in Figure 4. If the protection segment 1 fails, as shown in Figure 6, both SEB1 and SEB2 can detect the fault, and then modify the respective BPT table to prioritize the backup outbound port 2 corresponding to the protection segment 1 in the BPT table. Inverted, as shown in Figure 7, thereby reducing the priority corresponding to the alternate outgoing port 2 to a minimum. Therefore, when the BPT table is queried after the fault occurs in the working segment, the standby outgoing port is not queried, for example, the standby outgoing port 2 in FIG. 7 is not found.
  • FIG. 8 is a schematic diagram of a logical structure of an Ethernet tunnel segmentation protection load sharing system according to the present invention, including a configuration module and a switching module.
  • the configuration module includes an alternate port table BPT and a forwarding table
  • the switching module includes a switching detection module and a forwarding table refresh module. , switching execution module and link priority monitoring module.
  • the configuration module is configured to configure, on the segment edge bridge SEB of the PBB-TE segment protection group IPG having multiple protection segments and one working segment, between the traffic engineering service instance TESI and the protection segment corresponding to the standby out port on the SEB.
  • the alternate port table BPT and the forwarding table of the corresponding relationship the configuration module allocates different standby outgoing ports for each of the BPTs that are protected by the IPG, and sets different priorities for different standby outgoing ports;
  • the module updates the egress port of the corresponding entry in the forwarding table, the module preferentially selects the alternate egress port with a higher priority.
  • the switching module is configured to query the BPT to obtain an alternate egress port when the traffic protected by the IPG is switched to the protection segment, and update the egress port of the corresponding entry in the forwarding table to the standby egress port obtained by querying the BPT table; The IPG switches to the protection segment.
  • the switching detection module in the switching module is configured to detect whether the working segment is faulty, and if yes, notify the forwarding table refreshing module; the forwarding table refreshing module is configured to traverse each of the BPTs to be protected by the IPG when the working segment is faulty TESI, find the highest priority for each TESI The alternate outgoing port is then replaced with the outgoing port of each forwarding table entry corresponding to the TESI; finally, the switching execution module performs link switching according to the forwarding table.
  • the link priority monitoring module is configured to: when a certain protection segment in the IPG fails, minimize the priority of the standby outbound port corresponding to the protection segment in the BPT table for each TESI; and in the failure When the protection segment returns to normal, the priority of the alternate outgoing port corresponding to the protection segment in the BPT table is restored to the original value.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention se rapporte à un procédé de protection de segment et à un système pour tunnel Ethernet. Le procédé est le système selon l'invention sont utilisés pour résoudre les problèmes techniques tels que la congestion du trafic due aux salves de trafic sur le réseau ou similaires. Dans la présente invention, un segment de travail comporte M segments de protection qui servent à la protection, et le fonctionnement normal du réseau peut être garanti même quand une pluralité de pannes de liaisons se produit. En outre, la fiabilité du réseau est améliorée. Une table de ports de sauvegarde (BPT) est configurée pour chaque groupe de protection d'infrastructure (IPG) ; les sorties de sauvegarde de différentes instances des services techniques de trafic (TESI) dans chaque BPT se voient attribuer des priorités différentes ; quand la commutation de trafic se produit dans l'IPG, chacun des trafics peut être commuté à des segments de protection différents ; et le partage de la charge sur les segments de protection peut ainsi être accompli. La BPT configurée pour l'IPG contient les informations des TESI protégées par l'IPG. De cette manière, un groupe de TESI peut être protégé simultanément ; le conflit lié au fait que toutes les TESI qui passent sont commutées lorsque la commutation est exécutée dans la protection de liaison est résolu ; et la flexibilité et de la configuration du réseau se trouve ainsi accrue.
PCT/CN2009/076287 2009-08-13 2009-12-30 Procédé de protection de segment et système pour tunnel ethernet WO2011017900A1 (fr)

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CN2009100904912A CN101997750A (zh) 2009-08-13 2009-08-13 一种以太网隧道分段保护方法及系统
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CN102347854B (zh) * 2010-07-30 2017-04-05 中兴通讯股份有限公司 一种选择可用预备保护段的方法及装置
ES2548542T3 (es) 2011-05-16 2015-10-19 Huawei Technologies Co., Ltd. Método y dispositivo de red para transmitir un flujo de datos
CN102594667A (zh) * 2012-02-03 2012-07-18 中兴通讯股份有限公司 一种实现快速重路由冗余保护的方法及装置
CN103117946B (zh) * 2012-12-11 2016-06-08 广东电网公司电力调度控制中心 基于隔离装置与隔离网关结合应用的流量分担方法
CN106385373B (zh) * 2015-07-27 2020-04-14 中兴通讯股份有限公司 流量传输方法及装置
CN108965123B (zh) * 2018-07-24 2021-01-22 京东方科技集团股份有限公司 一种链路切换方法和网络通信系统
CN109218107A (zh) * 2018-10-15 2019-01-15 迈普通信技术股份有限公司 链路切换方法、装置、网络设备及网络系统
CN112953777A (zh) * 2021-03-10 2021-06-11 浪潮云信息技术股份公司 一种数据中心互联网出口架构和连接方法

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