CN100466615C - 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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CN100466615C
CN100466615C CNB2005101326165A CN200510132616A CN100466615C CN 100466615 C CN100466615 C CN 100466615C CN B2005101326165 A CNB2005101326165 A CN B2005101326165A CN 200510132616 A CN200510132616 A CN 200510132616A CN 100466615 C CN100466615 C CN 100466615C
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CN1863162A (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MPLS VPN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；所述标签映射三层转发表项包含标签映射表项和三层转发表项，所述标签映射表项包含报文入标签、标签类型、二层封装信息，根据标签映射表项中的报文入标签得到用于转发直连网段报文的三层转发表项；
报文转发模块，用于根据上述标签映射三层转发表项获得二层封装信息，根据二层封装信息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，根据链路信息生成标签映射三层转发表项，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标签映射三层转发表项转发报文到目的地址。
所述三层转发表项中包括:标签索引、目的地址、二层封装信息。
一种直连网段路由处理方法，包括:
A、接收端接收报文，根据链路信息生成标签映射三层转发表项；所述标签映射三层转发表项包含标签映射表项和三层转发表项，所述标签映射表项包含报文入标签、标签类型、二层封装信息，根据标签映射表项中的报文入标签得到用于转发直连网段报文的三层转发表项；
B、根据所述标签映射三层转发表项获得二层封装信息，根据二层封装信息转发报文到目的地址。
所述步骤A中生成标签映射三层转发表项的策略包括:
用户驱动策略:用户上线时主动上报链路层封装信息生成标签映射三层转发表项；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，请求生成标签映射三层转发表项；或，
静态指定策略:预先设定标签映射三层转发表项的内容。
所述步骤B还包括:
根据标签映射三层转发表项中标签类型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:
确定报文为直连网段报文情况下，所述步骤B具体包括:
首先根据标签映射三层转发表项中的报文入标签项获得三层转发表中的标签索引，再根据标签索引及目的地址信息获得三层转发表中的二层封装信息，最后，根据得到的二层封装信息进行报文的转发。
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:
Figure C200510132616D00081
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 (7)

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；所述标签映射三层转发表项包含标签映射表项和三层转发表项，所述标签映射表项包含报文入标签、标签类型、二层封装信息，根据标签映射表项中的报文入标签得到用于转发直连网段报文的三层转发表项；
报文转发模块，用于根据上述标签映射三层转发表项获得二层封装信息，根据二层封装信息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，根据链路信息生成标签映射三层转发表项，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标签映射三层转发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，所述三层转发表项中包括:标签索引、目的地址、二层封装信息。
4、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，根据链路信息生成标签映射三层转发表项；所述标签映射三层转发表项包含标签映射表项和三层转发表项，所述标签映射表项包含报文入标签、标签类型、二层封装信息，根据标签映射表项中的报文入标签得到用于转发直连网段报文的三层转发表项；
B、根据所述标签映射三层转发表项获得二层封装信息，根据二层封装信息转发报文到目的地址。
5、如权利要求4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中生成标签映射三层转发表项的策略包括:
用户驱动策略:用户上线时主动上报链路层封装信息生成标签映射三层转发表项；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，请求生成标签映射三层转发表项；或，
静态指定策略:预先设定标签映射三层转发表项的内容。
6、如权利要求4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还包括:
根据标签映射三层转发表项中标签类型确定报文为直连网段报文。
7、如权利要求4所述的一种直连网段路由处理方法，其特征在于，确定报文为直连网段报文情况下，所述步骤B具体包括:
首先根据标签映射三层转发表项中的报文入标签项获得三层转发表中的标签索引，再根据标签索引及目的地址信息获得三层转发表中的二层封装信息，最后，根据得到的二层封装信息进行报文的转发。
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