CN1863162A - 一种直连网段路由处理方法及装置 - Google Patents

一种直连网段路由处理方法及装置 Download PDF

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Publication number
CN1863162A
CN1863162A CNA2005101326165A CN200510132616A CN1863162A CN 1863162 A CN1863162 A CN 1863162A CN A2005101326165 A CNA2005101326165 A CN A2005101326165A CN 200510132616 A CN200510132616 A CN 200510132616A CN 1863162 A CN1863162 A CN 1863162A
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CN100466615C (zh
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范灵源
赵学肄
乔剑
胡杰晖
何朝华
范志强
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Chengdu Huawei Technology Co Ltd
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Huawei Technologies Co Ltd
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Abstract

本发明涉及多协议标签交换虚拟私有网MPLSVPN技术领域中一种直连网段路由处理方法及装置。该方法包括：接收端接收报文，根据链路信息生成标签映射三层转发表项ILM+FIB；当确定所述报文为直连网段报文时，则根据所述ILM+FIB表项采用二级索引方法转发报文到目的地址。利用本发明所述方法及装置，实现了快速、简便的转发直连网段的VPN报文。

Description

一种直连网段路由处理方法及装置
技术领域
本发明涉及MPLS(多协议标签交换)VPN(虚拟私有网)技术领域，尤其涉及一种直连网段路由处理方法及装置。
背景技术
BGP(边界网关协议)/MPLS VPN是基于RFC2547bis的一种VPN解决方案。该BGP/MPLS VPN允许服务供应商使用自己的IP骨干网为客户提供VPN服务。其使用MP-BGP(多协议扩展的边界网关协议)在供应商的骨干网中交换VPN路由信息，并通过MPLS把VPN流量从一个站点转发到另一个站点。如图1所示，供应商为Site1与Site2之间提供VPN传输，为Site3和Site4之间提供VPN传输，两个VPN之间实现IP隔离，相对于传统的VPN业务的实现方案，该VPN在MPLS骨干网共享LSP(标签交换路径)隧道，而且具备丰富的VPN策略。
上述传输方案中，从数据转发平面上来说，私网流量将在Ingress PE上(运营商入口设备)根据目的IP匹配对应的私网路由，映射到一个DNHLFE(下一跳转发条目)，根据DNHLFE封装两层标签，外层标签将在MPLS骨干网上进行交换，直到流量到达正确的PE(服务边界路由器)；内层标签将在Egress PE(运营商出口设备)上匹配ILM(标签映射表)表，然后根据ILM表的信息发送到对应的CE(客户边界设备)，从而完成私网流量在MPLS骨干网上的传输。
上述MPLS网段路由的处理过程中，当目的地址为以CE作为下一跳的私网网段时，这样的转发将没有问题，但当目的地为PE与CE相连的网段时，报文携带的标签将无法指导转发，因为标签一般只绑定到PE-CE网段路由，没有办法来区分该报文应该交给PE还是CE。
当前实现MPLS VPN的诸多设备中，解决上述问题的方法基本上都是在ILM表中为这种标签做上标志，标识这个标签为直连网段的标签，一旦从MPLS侧接收到带有所述标签的报文，则将报文上交PE的软件平面进行转发，再次进行私网的路由匹配。
上述技术方案，实现在Egress PE端对于这种私网的流量先进行一次标签映射，然后再进行一次私网路由的匹配，其存在的缺陷在于：
1)对于实现控制平面与转发平面分离的设备来说，这种转发带来严重的效率问题，直接影响用户的转发速率；
2)对于实现入接口板与出接口板独立的分布式的设备而言，连接MPLS侧的入接口板和连接CE侧的出接口板因为被设计为具有不同的功能，入接口板往往不会保存用户的私网路由信息，因此该方案在实现上存在一定的困难。
另外一种实现方案为：采用私网路由发布的策略，首先为主机路由分配不同的标签，然后将所述标签映射通过MP-BGP发布到对端PE，使得处于同一个直连网段的主机路由在Ingress PE上映射为不同的标签，因此在Egress PE上将得到正确的处理。
上述技术方案实现简单，但存在如下缺陷：
(1)由于需要为主机路由分配标签，当主机需要处理的事件比较多，特别是当PE设备直挂二层设备时，将消耗很多标签，在一定程度上相当于降低了设备支持的规格，于本端PE而言降低了支持ILM表项的规格，于对端PE而言降低了支持的私网路由数的规格；
(2)由于将主机路由纳入BGP需要发布的私网路由当中，增加了BGP协议的处理，在处理效率上将受到影响，尤其在VPN拓扑发生变化需要全部重新刷新时，带来处理瓶颈。
发明内容
鉴于上述现有技术所存在的问题，本发明的目的在于提供一种直连网段路由处理方法及装置，利用扩充的ILM表项，采用二级索引方法转发直连网段路由的处理。
本发明的目的是通过以下技术方案实现的：
一种直连网段路由处理装置，至少包括：
表项生成模块，用于生成标签映射三层转发表项ILM+FIB；
报文转发模块，用于根据上述ILM+FIB表项将报文转发到目的地址。
所述表项生成模块提供与报文转发模块的接口，表项生成模块从报文接收端获取报文及链路信息，根据链路信息生成ILM+FIB表项，并通过所述接口传送给报文转发模块，由报文转发模块根据所述ILM+FIB表项转发报文到目的地址。
所述ILM+FIB表项中包括标签映射ILM表项，所述ILM表项包括：报文入标签In-Label、标签类型Label-Type、封装信息L2 Encap Information。
所述ILM+FIB表项中还包括三层转发FIB表项，所述FIB表项中包括：标签索引Label-Id、目的地址、封装信息L2 Encap Information。
一种直连网段路由处理方法，包括：
A、接收端接收报文，根据链路信息生成ILM+FIB表项；
B、确定所述报文为直连网段报文，则根据所述ILM+FIB表项采用二级索引的方法转发报文到目的地址。
所述步骤A中生成ILM+FIB表项的策略包括：
用户驱动策略：用户上线时主动上报链路层封装信息生成ILM+FIB表项；或，
流驱动策略：到达某用户的首包流量上交软件控制平面触发链路信息，请求生成ILM+FIB表项；或，
静态指定策略：预先设定ILM+FIB表项的内容。
所述步骤B中确定所述报文为直连网段报文的方法为：
根据ILM+FIB表项中标签类型Label-Type确定报文为直连网段报文。
所述步骤B中二级索引的方法具体包括：
首先根据ILM+FIB表项中的In-Label项获得FIB表中的Label-Id，再根据Label-Id及目的地址信息获得FIB表中的L2 Encap Information，最后，根据得到的L2 Encap Information进行报文的转发。
由上述本发明提供的技术方案可以看出，本发明实现了利用扩充后的ILM和ILM+FIB表项识别并转发目的地址为直连网段的报文，转发速率快，实现简便。
附图说明
图1为现有技术MPLS VPN架构示意图；
图2为本发明所述装置模块示意图；
图3为本发明所述方法一种实施例操作流程图。
具体实施方式
本发明的核心思想是提供一种直连网段路由处理方法及装置，利用扩充后的ILM表项，采用二级索引的方法识别并转发目的地址为直连网段的报文，转发速率快，实现简便。
本发明提供一种直连网段路由处理装置，所述装置至少包括一表项生成模块及一报文转发模块，其模块示意图如图2所示。所述表项生成模块用于生成扩充的ILM表项，即ILM+FIB表项(三层转发标签映射表项)，该表项是将原ILM表项扩充后得到的。其中原ILM表项包含的内容如下所示：
  In-Label   L2 Encap Information
扩充后的ILM+FIB表项为：
其中，In-Label项表示报文入标签，根据该项内容可以得到上表中箭头所指的FIB表项，在FIB表中Label-Id表示标签索引；A.B.C.D表示报文目的地址；
Label-Type是扩充的内容，表示标签类型，根据所述内容可以识别报文是否为直连网段报文，只有报文为直连网段的报文时才会存在上述的FIB表；
所述L2 Encap Information表示报文的二层封装信息；
所述报文转发模块用于根据上述ILM+FIB表项，获得L2 EncapInformation，根据L2 Encap Information将报文转发到目的地址。
本发明提供一种直连网段路由处理方法，所述方法一种实施例操作过程如图3所示，具体包括：
步骤1：接收端接收报文，表项生成模块生成ILM+FIB表项；
该ILM+FIB表项生成策略包括：
用户驱动策略：用户上线时主动上报链路层封装信息，由表项生成模块根据所述用户上报的信息生成ILM+FIB表项，即根据链路层封装信息确定报文入标签内容、标签类型等信息，填写在ILM+FIB表项中；
流驱动策略：指到达某用户的首包流量上交软件控制平面触发链路信息，请求表项生成模块生成该ILM+FIB表项，表项生成模块根据链路信息获得ILM+FIB表项的各项内容生成ILM+FIB表项；
静态指定策略：指表项生成模块预先设定ILM+FIB表项的内容；
步骤2：报文转发模块根据ILM+FIB表项中的标签类型确定该报文是否为直连网段报文；
步骤3：若所述报文非直连网段报文，则直接根据ILM+FIB表项中ILM表项的L2 Encap Information项进行报文转发；
步骤4：若所述报文是直连网段的报文，则采用二级索引的方法进行报文转发；
首先根据ILM+FIB表项中的In-Label项获得FIB表中的Label-Id，再根据Label-Id及报文目的地址信息获得FIB表中的L2 Encap Information，最后，报文转发模块根据得到的L2 Encap Information进行报文的转发。
综上所述，本发明利用扩充的ILM和ILM+FIB表项实现了快速简便的转发直连网段的报文。
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 (8)

1、一种直连网段路由处理装置，其特征在于，至少包括：
表项生成模块，用于生成标签映射三层转发表项ILM+FIB；
报文转发模块，用于根据上述ILM+FIB表项将报文转发到目的地址。
2、如权利要求1所述的一种直连网段路由处理装置，其特征在于，所述表项生成模块提供与报文转发模块的接口，表项生成模块从报文接收端获取报文及链路信息，根据链路信息生成ILM+FIB表项，并通过所述接口传送给报文转发模块，由报文转发模块根据所述ILM+FIB表项转发报文到目的地址。
3、如权利要求1或2所述的一种直连网段路由处理装置，其特征在于，所述ILM+FIB表项中包括标签映射ILM表项，所述ILM表项包括：报文入标签In-Label、标签类型Label-Type、封装信息L2 Encap Information。
4、如权利要求3所述的一种直连网段路由处理装置，其特征在于，所述ILM+FIB表项中还包括三层转发FIB表项，所述FIB表项中包括：标签索引Label-Id、目的地址、封装信息L2 Encap Information。
5、一种直连网段路由处理方法，其特征在于，包括：
A、接收端接收报文，根据链路信息生成ILM+FIB表项；
B、确定所述报文为直连网段报文，则根据所述ILM+FIB表项采用二级索引的方法转发报文到目的地址。
6、如权利要求5所述的一种直连网段路由处理方法，其特征在于，所述步骤A中生成ILM+FIB表项的策略包括：
用户驱动策略：用户上线时主动上报链路层封装信息生成ILM+FIB表项；或，
流驱动策略：到达某用户的首包流量上交软件控制平面触发链路信息，请求生成ILM+FIB表项；或，
静态指定策略：预先设定ILM+FIB表项的内容。
7、如权利要求5所述的一种直连网段路由处理方法，其特征在于，所述步骤B中确定所述报文为直连网段报文的方法为：
根据ILM+FIB表项中标签类型Label-Type确定报文为直连网段报文。
8、如权利要求5所述的一种直连网段路由处理方法，其特征在于，所述步骤B中二级索引的方法具体包括：
首先根据ILM+FIB表项中的In-Label项获得FIB表中的Label-Id，再根据Label-Id及目的地址信息获得FIB表中的L2 Encap Information，最后，根据得到的L2 Encap Information进行报文的转发。
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WO2009012688A1 (fr) * 2007-07-20 2009-01-29 Huawei Technologies Co., Ltd. Procédé, système et appareil de réacheminement de message dans un réseau privé virtuel à trois couches
WO2009062404A1 (fr) * 2007-11-12 2009-05-22 Zte Corporation Procédé de mise en correspondance de tunnels
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CN101222357B (zh) * 2007-12-26 2010-12-15 杭州华三通信技术有限公司 保存硬件表项索引的方法、系统和主控板及接口板
WO2013123897A1 (zh) * 2012-02-24 2013-08-29 中兴通讯股份有限公司 一种三层虚拟专用网私网数据转发的方法、装置和系统

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