WO2017177644A1 - 一种ce双归接入pe组网中基于mstp的防环方法 - Google Patents

一种ce双归接入pe组网中基于mstp的防环方法 Download PDF

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WO2017177644A1
WO2017177644A1 PCT/CN2016/102797 CN2016102797W WO2017177644A1 WO 2017177644 A1 WO2017177644 A1 WO 2017177644A1 CN 2016102797 W CN2016102797 W CN 2016102797W WO 2017177644 A1 WO2017177644 A1 WO 2017177644A1
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mstp
dual
network
bridge
based anti
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童振宇
马红斌
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Fiberhome Telecommunication Technologies Co Ltd
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Fiberhome Telecommunication Technologies Co Ltd
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Priority to PH12018501085A priority patent/PH12018501085A1/en
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    • 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
    • H04L45/18—Loop-free operations
    • 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
    • H04L45/48—Routing tree calculation
    • 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
    • H04L45/68—Pseudowire emulation, e.g. IETF WG PWE3

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  • the present invention relates to the field of data and IP transmission equipment, and in particular, to an MSTP-based anti-ring method for CE dual-homing access to a PE network.
  • a broadcast storm of packets is generated, which occupies the effective bandwidth of the entire network and causes network paralysis.
  • STP Shorting Tree Protocol
  • RSTP Rapid Spanning Tree Protocol
  • the VLAN cannot be distinguished, and all the packets are transmitted on one link, resulting in inefficiency. Therefore, the MSTP (Multiple Spanning Tree Protocol) is introduced. This protocol introduces the concept of domain and instance based on RSTP. , not only improve the network convergence speed, but also make full use of the network bandwidth.
  • the existing MSTP is mainly applied to the VLAN (Virtual Local Area Network) model of the Layer 2 switching network.
  • the common Layer 2 service is the VPLS (virtual private LAN service) model, VPLS.
  • the model also has the possibility of a two-layer loop. As shown in Figure 1, a scenario in which a customer edge device (CE) is dual-homed to a PE (Provider Edge, the edge device of the service provider backbone network) is deployed.
  • CE customer edge device
  • PE Provide Edge
  • the CE is connected to the PE network, including the first PE (ie PE1) and the second PE (PE2), both of which are connected to the first CE (ie CE1), and CE1 is connected to the personal computer (ie PC), PE1 and PE2 also passes the business PW (Pseudo Wire, pseudowire) is connected to the third PE (ie PE3), and PE3 is connected to the second CE (ie CE2).
  • the existing VPLS anti-ring method cannot solve the problem of the second-layer loop in the CE dual-homing access to the PE network. Therefore, it is necessary to design a method to solve the above problem.
  • the present invention provides an MSTP-based anti-ring method for a CE to be dual-homed to a PE network. Prevent network failures.
  • the technical solution adopted by the present invention is: an MSTP-based anti-ring method for CE dual-homing access to a PE network, and the CE dual-homing access PE network includes a first PE and a second PE. Each of the first PE and the second PE is connected to the first CE by using a pseudowire.
  • the anti-ring method includes: creating a management pseudowire between the first PE and the second PE, and managing the two ends of the pseudowire. Create a virtual interface, add the virtual interface to the MSTP bridge, and set the MSTP bridge to the highest priority. Modify the ID and cost of the MSTP bridge to the minimum of all physical ports. The virtual interface is enabled. MSTP function.
  • the VPLS in the active state, sends a message to the MSTP, and the MSTP creates two corresponding virtual interfaces according to the VPLS ID.
  • the management pseudowire when the management pseudowire is deactivated, the DOWN message is sent to the MSTP, and the MSTP kicks the two virtual interfaces out of the MSTP bridge to delete the two virtual interfaces.
  • the virtual interface sends or receives a bridge protocol data unit signaling message and participates in topology calculation.
  • MSTP calculates the two virtual interfaces and other physical ports in a unified manner.
  • the virtual interface and other physical ports are all in one In the public and internal spanning trees.
  • the invention can also set the MSTP protocol mode to RSTP and STP, can support multiple protocol modes, and expand the application range of the prior art.
  • FIG. 1 is a schematic diagram of a scenario in which a CE is dual-homed to a PE network in the background;
  • FIG. 2 is a schematic diagram of a scenario for creating a management pseudowire in a CE dual-homing access PE network according to the present invention
  • FIG. 3 is a flow chart of creating a virtual interface in the present invention.
  • the CE is dual-homed to the MSTP-based anti-ring method in the PE network.
  • the CE is dual-homed to the PE network.
  • the CE dual-homed PE network includes the first PE (PE1) and The second PE (ie, PE2) is connected to the third PE (ie, PE3) through the service PW, and the PE1 is connected to the second CE (ie, CE2). Both PE1 and PE2 are connected to the first CE (ie, CE1), CE1.
  • the anti-ring method of the present invention includes: Create a management PW between PE1 and PE2, and manage PE1 and PE2 at both ends of the PW to create a virtual interface. Add the two virtual interfaces to the MSTP bridge and set the MSTP bridge to the highest priority. The ID and cost of the bridge are changed to the minimum of all physical ports, so that the two virtual interfaces enable MSTP.
  • the management PW is in an active state
  • the VPLS sends a message for creating a management PW to the MSTP, that is, the VPLS sends an UP message to the MSTP.
  • MSTP creates two corresponding virtual interfaces stpif according to the VPLS ID.
  • VPLS ID 100 the two virtual interfaces are both stpif100, but the two virtual interfaces are located at two different stations.
  • the virtual interface is used to send or receive a BPDU (Bridge Protocol Data Unit) signaling message and participate in topology calculation.
  • BPDU Bridge Protocol Data Unit
  • the virtual interface enables MSTP.
  • the PE1 corresponds to a management PW between PE1 and PE2.
  • the network-side port does not have a specific physical port.
  • the physical port corresponding to the network-side port may change with the topology. Therefore, two PE1 and PE2 cannot be blocked.
  • you need to block the CE1 side port that is, prevent loops between CE1, PE1, and PE2.
  • MSTP calculates the two virtual interfaces and other physical ports uniformly.
  • the DOWN message is sent to the MSTP.
  • the MSTP kicks the two virtual interfaces out of the MSTP bridge and deletes the two virtual interfaces.
  • the present invention does not support the case of multiple instances. All the ports in the instance 0, that is, the CIST (Common and Internal Spanning Tree) instance, all VLANs are also bound in the instance 0, the virtual The interface and other physical ports are in one CIST and avoid Layer 2 loops in the CIST instance.
  • All the ports in the instance 0, that is, the CIST (Common and Internal Spanning Tree) instance all VLANs are also bound in the instance 0, the virtual The interface and other physical ports are in one CIST and avoid Layer 2 loops in the CIST instance.

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

Abstract

一种CE双归接入PE组网中基于MSTP的防环方法，涉及数据和IP传输设备领域，CE双归接入PE组网包括第一PE和第二PE，二者分别通过伪线连接至第三PE，第一PE和第二PE均连接至第一CE，防环方法包括：在第一PE和第二PE之间创建一条管理伪线，管理伪线两端分别创建一个虚拟接口，将所述虚拟接口加入MSTP桥中，并将MSTP桥设置为最高优先级，同时将MSTP桥的ID及开销修改为所有物理端口中的最小值；所述虚拟接口使能MSTP功能。本发明能够避免CE双归接入PE组网中出现二层环路，防止网络瘫痪。

Description

一种CE双归接入PE组网中基于MSTP的防环方法 技术领域
本发明涉及数据和IP传输设备领域，具体来讲涉及一种CE双归接入PE组网中基于MSTP的防环方法。
背景技术
在二层交换网络中，一旦出现环路就会造成报文的广播风暴，从而占用整个网络的有效带宽，造成网络的瘫痪。在这种情况下，为解决二层环路而产生了STP(Spanning Tree Protocol，生成树协议)，随后以STP为基础，产生了RSTP(Rapid Spanning Tree Protocol，快速生成树协议)；由于RSTP协议不能区分VLAN，所有报文均在一个链路上传输，导致效率低下，所以逐渐出现MSTP协议(Multiple Spanning Tree Protocol，多生成树协议)，该协议在RSTP的基础上引入了域和实例的概念，既提高了网络收敛速度，同时也对网络带宽进行了充分利用。
现有MSTP主要应用于二层交换网络的VLAN(Virtual Local Area Network，虚拟局域网)模型中，在IPRAN系统中，常见的二层业务为VPLS(virtual Private Lan Service，虚拟专用局域网业务)模型，VPLS模型也存在二层环路的可能。如图1所示，为CE(Customer Edge，用户边缘设备)双归接入PE(Provider Edge，服务提供商骨干网的边缘设备)组网的场景示意图。CE双归接入PE组网，包括第一PE(即PE1)和第二PE(即PE2)，二者均与第一CE(即CE1)相连，CE1连接个人计算机(即PC)，PE1和PE2还通过业务PW(Pseudo  Wire，伪线)连接第三PE(即PE3)，PE3连接第二CE(即CE2)。但是，现有VPLS防环方法，并不能解决CE双归接入PE组网中出现二层环路的问题，因此有必要设计一种方法，解决上述问题。
发明内容
针对现有技术中存在的缺陷，本发明的目的在于提供一种CE双归接入PE组网中基于MSTP的防环方法，能够避免CE双归接入PE组网中出现二层环路，防止网络瘫痪。
为达到以上目的，本发明采取的技术方案是：一种CE双归接入PE组网中基于MSTP的防环方法，CE双归接入PE组网包括第一PE和第二PE，二者分别通过伪线连接至第三PE，第一PE和第二PE均连接至第一CE，防环方法包括：在第一PE和第二PE之间创建一条管理伪线，管理伪线两端分别创建一个虚拟接口，将所述虚拟接口加入MSTP桥中，并将MSTP桥设置为最高优先级，同时将MSTP桥的ID及开销修改为所有物理端口中的最小值；所述虚拟接口使能MSTP功能。
在上述技术方案的基础上，所述管理伪线在激活状态下，VPLS发送消息到MSTP，MSTP根据VPLS ID创建对应的两个虚拟接口。
在上述技术方案的基础上，当管理伪线去激活时，发送DOWN消息到MSTP，MSTP将两个虚拟接口从MSTP桥中踢出，删除两个虚拟接口。
在上述技术方案的基础上，所述虚拟接口发送或接收桥协议数据单元信令报文，并参与拓扑计算。
在上述技术方案的基础上，计算生成树时，MSTP将两个虚拟接口和其他物理端口统一进行计算。
在上述技术方案的基础上，所述虚拟接口和其他物理端口均在一 棵公共和内部生成树中。
本发明的有益效果在于：
1、PE1和PE2之间创建一条管理PW，管理PW两端分别创建一个虚拟接口，将所述虚拟接口加入MSTP桥中，将MSTP桥设置为最高优先级，同时将MSTP桥的ID及开销修改为所有物理端口中的最小值，所述虚拟接口使能MSTP功能，主要在CE双归接入PE组网中，防止PE1、PE2和CE1之间二层环路，防止网络阻塞瘫痪。
2、本发明还可以将MSTP协议模式设置成RSTP和STP，能够支持多种协议模式，扩展了现有技术的应用范围。
附图说明
图1为背景技术中CE双归接入PE组网的场景示意图；
图2为本发明CE双归接入PE组网中创建管理伪线的场景示意图；
图3为本发明中虚拟接口创建流程图。
附图标记：
PE1-第一PE，PE2-第二PE，PE3-第三PE，CE1-第一CE，CE2-第二CE。
具体实施方式
以下结合附图及实施例对本发明作进一步详细说明。
如图2所示，CE双归接入PE组网中基于MSTP的防环方法，用于CE双归接入PE组网，CE双归接入PE组网包括第一PE(即PE1)和第二PE(即PE2)，二者分别通过业务PW连接至第三PE(即PE3)，PE3连接第二CE(即CE2)，PE1和PE2还均连接至第一CE(即CE1)，CE1连接个人计算机(即CP)。本发明的防环方法包括： 在PE1和PE2之间创建一条管理PW，管理PW两端的PE1和PE2处，分别创建一个虚拟接口；将两个虚拟接口加入MSTP桥中，并将MSTP桥设置为最高优先级，同时将该MSTP桥的ID及开销修改为所有物理端口中的最小值，让两个虚拟接口使能MSTP功能。
如图3所示，虚拟接口的具体创建流程如下：
S101.管理PW处于激活状态下；
S102.VPLS发送创建管理PW的消息到MSTP，即VPLS发送UP消息到MSTP；
S103.MSTP根据VPLS ID创建对应的两个虚拟接口stpif，例如：VPLS ID 100，则两个虚拟接口均为stpif100，但是两个虚拟接口位于不同的两个站。所述虚拟接口用来发送或接收BPDU(Bridge Protocol Data Unit，桥协议数据单元)信令报文，并参与拓扑计算。
S104.将两个虚拟接口加入MSTP桥中，虚拟接口使能MSTP功能。由于VPLS对应的PE1与PE2之间是一条管理PW，其网络侧端口没有特定的物理端口对应，网络侧端口对应的物理端口可能随着拓扑的变化而变化，所以不能阻塞PE1和PE2的两个虚拟接口，只需要阻塞CE1侧端口，即防止CE1、PE1、PE2之间环路。因此，将MSTP桥设置为最高优先级，即优先级修改为0，同时将两个虚拟接口所在桥的ID及开销修改为所有物理端口中的最小值，例如：cist_path_cost(公共和内部生成树开销)为1，cist_priority(公共和内部生成树优先级)为16，cist_port_id(公共和内部生成树端口ID)起始值小于物理端口。这样，计算生成树时，MSTP将两个虚拟接口和其他物理端口统一进行计算。
当需要管理伪线去激活时，发送DOWN消息到MSTP，MSTP将两个虚拟接口从MSTP桥中踢出，删除两个虚拟接口。
本发明不支持多实例的情况，所有端口均在实例0中，也就是CIST(Common and Internal Spanning Tree，公共和内部生成树)实例中，所有VLAN也均绑定在实例0里，所述虚拟接口和其他物理端口均在一棵CIST中，并在CIST实例里避免二层环路。
本发明不局限于上述实施方式，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围之内。本说明书中未作详细描述的内容属于本领域专业技术人员公知的现有技术。

Claims (6)

  1. 一种CE双归接入PE组网中基于MSTP的防环方法，CE双归接入PE组网包括第一PE和第二PE，二者分别通过伪线连接至第三PE，第一PE和第二PE均连接至第一CE，其特征在于，防环方法包括：在第一PE和第二PE之间创建一条管理伪线，管理伪线两端分别创建一个虚拟接口，将所述虚拟接口加入MSTP桥中，并将MSTP桥设置为最高优先级，同时将MSTP桥的ID及开销修改为所有物理端口中的最小值；所述虚拟接口使能MSTP功能。
  2. 如权利要求1所述的CE双归接入PE组网中基于MSTP的防环方法，其特征在于：所述管理伪线在激活状态下，VPLS发送消息到MSTP，MSTP根据VPLS ID创建对应的两个虚拟接口。
  3. 如权利要求1所述的CE双归接入PE组网中基于MSTP的防环方法，其特征在于：当管理伪线去激活时，发送DOWN消息到MSTP，MSTP将两个虚拟接口从MSTP桥中踢出，删除两个虚拟接口。
  4. 如权利要求1所述的CE双归接入PE组网中基于MSTP的防环方法，其特征在于：所述虚拟接口发送或接收桥协议数据单元信令报文，并参与拓扑计算。
  5. 如权利要求1所述的CE双归接入PE组网中基于MSTP的防环方法，其特征在于：计算生成树时，MSTP将两个虚拟接口和其他物理端口统一进行计算。
  6. 如权利要求1所述的CE双归接入PE组网中基于MSTP的防环方法，其特征在于：所述虚拟接口和其他物理端口均在一棵公共和内部生成树中。
PCT/CN2016/102797 2016-04-12 2016-10-21 一种ce双归接入pe组网中基于mstp的防环方法 Ceased WO2017177644A1 (zh)

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