CN103973568B - Method and apparatus for forwarding sdn flow in the core network mpls - Google Patents

Method and apparatus for forwarding sdn flow in the core network mpls Download PDF

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CN103973568B
CN103973568B CN201310046036.9A CN201310046036A CN103973568B CN 103973568 B CN103973568 B CN 103973568B CN 201310046036 A CN201310046036 A CN 201310046036A CN 103973568 B CN103973568 B CN 103973568B
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label
software
flow
stack
defined network
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CN103973568A (en
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梁铮
宾梵翔
刘刚
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上海贝尔股份有限公司
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Abstract

本发明涉及用于在多协议标签交换核心网上转发软件定义网络流的方法和设备。 The present invention relates to a multi-protocol label switching core network forwarding software-defined network flow method and apparatus. 根据示例性实施例提出了一种用于转发软件定义网络流的方法,所述方法包括:至少部分地基于与软件定义网络流分组相对应的软件定义网络流条目,获取用于所述软件定义网络流分组的软件定义网络流标签栈;为所述软件定义网络流分组确定与所述软件定义网络流标签栈相对应的标签交换路径标签栈;以及至少部分地基于所述标签交换路径标签栈,在多协议标签交换核心网上转发数据分组,其中,所述数据分组至少包括所述标签交换路径标签栈、所述软件定义网络流标签栈和所述软件定义网络流分组。 According to an exemplary embodiment proposes a method for forwarding a software-defined network flow, the method comprising: at least partially based on software-defined network entry flow network defined stream packets corresponding to the software, the software defined for obtaining software-defined network flow label stack of a packet network flow; determining a packet stream with the software defined network label stack corresponding label switched path label stacks for the software-defined network stream; and at least in part on the label switched path label stack in MPLS core network forwarding data packets, wherein the data packet comprises at least a label switched path label stack, a software-defined network and the flow label stack software-defined network packet stream.

Description

用于在MPLS核心网上转发SDN流的方法和设备 Method and apparatus for forwarding SDN flow in the MPLS core network

技术领域 FIELD

[0001] 本发明一般地涉及对数据流的转发,并且特别涉及用于在既有的多协议标签交换(MPLS)核心网上转发软件定义网络流(SDN-f low)的方法和设备。 [0001] The present invention relates to the forwarding of the data streams in general, and particularly relates to a method and apparatus for forwarding streaming software-defined network (SDN-f low) in the existing multi-protocol label switching (MPLS) core network.

背景技术 Background technique

[0002] SDN是一种功能强大的全新网络模式,其为核心网及应用的创新提供了良好的平台,该理念对网络的数据平面、控制平面和管理平面有着广泛而深远的影响。 [0002] SDN is a powerful new network mode, which provides a good platform for the core network and innovative applications, the concept of network data plane, control plane and management plane have extensive and far-reaching impact. 部署SDN可以改进网络的性能、灵活性和可管理性,并由此通过软件加快革新的步伐。 SDN deployment can improve performance, flexibility and manageability of the network, and thus accelerate the pace of innovation by software. 当前,SDN这一突破性技术得到了许多网络运营商的广泛认可,并且将在多个协会和组织(例如欧洲电信标准化协会(ETSI)和宽带论坛(BBF)等)中开展标准化工作。 Current, SDN This breakthrough technology has been widely recognized by many network operators and standardization work will be carried out in a plurality of associations and organizations (such as the European Telecommunications Standards Institute (ETSI) and the Broadband Forum (BBF), etc.).

[0003] 众多研究表明SDN需要混合型迀移模式,举例来说,SDN应当能够在混合环境中与现有网络协议进行互操作。 [0003] Many studies show that SDN type Gan-shift mode to be mixed, for example, SDN should be able to interoperate with existing network protocols in a hybrid environment. 具体而言,SDN是一项突破性技术并且难以在短时间内构建。 Specifically, SDN is a breakthrough technology and difficult to build in a short time. 为了保护先期投资,网络运营商会期望按照逐步的方式来实现SDN概念。 To protect the upfront investment, network operators will expect in a stepwise manner to achieve the SDN concept. 因而,需要设计一种使得SDN能够与现有网络(诸如既有的MPLS核心网)进行互操作的方案,从而能够实现SDN网络与既有的MPLS核心网间的耦合。 Accordingly, it is necessary to design a program that can be SDN interoperable with existing networks (such as the existing MPLS core network), thereby enabling coupling SDN existing MPLS core network and the gateway.

发明内容 SUMMARY

[0004] 鉴于以上原因,本发明提出了一种用于实现在MPLS核心网上转发SDN流数据分组的方案,旨在克服现有技术中存在的至少一项问题。 [0004] In view of the above, the present invention proposes a method for implementing the SDN forwarding data stream packets in the MPLS core network solutions designed to overcome at least one problem of the prior art.

[0005] 根据本发明的第一方面,提供了一种用于转发SDN流的方法,所述方法包括:至少部分地基于与SDN流分组相对应的SDN流条目,获取用于所述SDN流分组的SDN流标签栈;为所述SDN流分组确定与所述SDN流标签栈相对应的标签交换路径(LSP)标签栈;以及至少部分地基于所述LSP标签栈,在MPLS核心网上转发数据分组,其中,所述数据分组至少包括所述LSP标签栈、所述SDN流标签栈和所述SDN流分组。 [0005] According to a first aspect of the present invention, there is provided a method of forwarding a stream of SDN, the method comprising: at least partially based on the SDN SDN stream packets corresponding to the flow entry, for obtaining the flow SDN SDN flow label stack of a packet; packet stream to the SDN SDN determining the flow label stack corresponding label switched path (LSP) label stack; and in part on the LSP label stack in the MPLS core network forwarding data at least packet, wherein the data packet comprises at least the LSP label stack, the stack and the flow label SDN SDN stream packets.

[0006] 根据本发明的第二方面,提供了一种用于转发SDN流的设备,所述设备包括:获取模块,其被配置以便至少部分地基于与SDN流分组相对应的SDN流条目,获取用于所述SDN流分组的SDN流标签栈;确定模块,其被配置以便为所述SDN流分组确定与所述SDN流标签栈相对应的LSP标签栈;以及转发模块,其被配置以便至少部分地基于所述LSP标签栈,在MPLS核心网上转发数据分组,其中,所述数据分组至少包括所述LSP标签栈、所述SDN流标签栈和所述SDN流分组。 [0006] According to a second aspect of the present invention, there is provided an apparatus for forwarding SDN stream, said apparatus comprising means for: acquiring module, which is configured to at least partially based SDN SDN stream packets corresponding to the flow entry, Gets the label stack SDN SDN flow stream packet; determining module, which is configured so as to determine the packet stream with the SDN SDN flow label stack corresponding LSP label stack; and a forwarding module, configured to at least in part on the LSP label stack in the MPLS core network forwarding data packets, wherein the data packet comprises at least the LSP label stack, the stack and the flow label SDN SDN stream packets.

[0007] 根据本发明的第三方面,提供了一种用于转发SDN流的方法,所述方法包括:响应于在MPLS核心网上接收到数据分组,获取SDN流标签栈,其中,所述数据分组至少包括SDN流分组以及用于所述SDN流分组的LSP标签栈和所述SDN流标签栈;以及至少部分地基于所述SDN流标签栈来转发所述SDN流分组。 [0007] According to a third aspect of the present invention, there is provided a method of forwarding a stream of SDN, the method comprising: in response to receiving a data packet to the MPLS core network, obtaining SDN flow label stack, wherein said data SDN packet includes at least packet stream and the packet stream for the SDN LSP label stack and the stack SDN flow label; and at least partially forwarding the packet stream based on the SDN SDN flow label stack.

[0008] 根据本发明的第四方面,提供了一种用于转发SDN流的设备,所述设备包括:获取模块,其被配置以便响应于在MPLS核心网上接收到数据分组,获取SDN流标签栈,其中,所述数据分组至少包括SDN流分组以及用于所述SDN流分组的LSP标签栈和所述SDN流标签栈;以及转发模块,其被配置以便至少部分地基于所述SDN流标签栈来转发所述SDN流分组。 [0008] According to a fourth aspect of the present invention, there is provided an apparatus for forwarding SDN stream, the apparatus comprising: an acquisition module, which is configured to in response to receiving the MPLS packet data core network, obtaining a flow label SDN stack, wherein said data packet includes at least packet stream and for the SDN SDN LSP label stack of the packet flow and the flow SDN label stack; and a forwarding module, configured to at least partially based on the flow label SDN SDN stack forwarding the packet stream.

[0009] 通过采用依照本发明示例性实施例所描述的方案,可以实现SDN与既有的MPLS核心网的有效耦合,从而能够根据不同的SDN流匹配字段集和/或动作集来区分SDN流在MPLS 核心网上的递送。 [0009] By use of the program in accordance with an exemplary embodiment of the present invention described herein may be implemented with the existing SDN efficient coupling MPLS core network, it is possible to distinguish between different streams according SDN SDN stream matching set of fields and / or actions set in the MPLS core network delivery. 此外,在采用示例性实施例所描述的解决方案时,仅需要修改网络边缘路由器,而不需要修改中间路由器。 Further, when the solution in the exemplary embodiment described, the edge routers only need to modify a network, without requiring modification of the intermediate routers.

附图说明 BRIEF DESCRIPTION

[0010] 在所附权利要求中阐述了本发明的新颖性特征。 [0010] The novel features set forth in the present invention are appended claims. 当结合附图阅读时,通过参照以下对说明性实施例的详细描述,将最好地理解本发明本身以及优选的使用模式,及其进一步的目的和优点,在附图中: When read in conjunction with the accompanying drawings, the following detailed description of illustrative embodiments with reference to embodiments, the present invention will be best understood itself and preferred mode of use, further objects and advantages, in the drawings:

[0011]图1是依照本发明不例性实施例的不意图,其说明了在具有SDN流标签枝和LSP标签栈的情况下在既有的核心网上对SDN流分组的转发; [0011] FIG. 1 is not in accordance with the present exemplary embodiment is not intended to embodiments of the invention, illustrating a case where the forward flow label having branches and SDN LSP in the label stack of the existing core network SDN stream packet;

[0012]图2依照本发明的示例性实施例示出了混合型SDN网络和核心网的场景1; [0012] FIG. 2 in accordance with an exemplary embodiment of the present invention shows a hybrid scenario SDN network and the core network 1;

[0013]图3依照本发明的示例性实施例示出了混合型SDN网络和核心网的场景2; [0013] FIG. 3 in accordance with an exemplary embodiment of the present invention shows a hybrid scenario SDN network and the core network 2;

[0014]图4依照本发明的示例性实施例示出了混合型SDN网络和核心网的场景3; [0014] FIG. 4 in accordance with an exemplary embodiment of the present invention shows a hybrid scenario SDN network and the core network 3;

[0015]图5依照本发明的示例性实施例示出了用于转发SDN流的方法的流程图; [0015] FIG. 5 in accordance with an exemplary embodiment of the present invention shows a flowchart of a method of forwarding SDN stream;

[0016] 图6 (a)依照本发明的示例性实施例说明了一种SDN流标签栈; [0016] FIG. 6 (a) in accordance with an exemplary embodiment of the present invention describes a flow SDN label stack;

[0017] 图6 (b)依照本发明的示例性实施例说明了另一种SDN流标签栈; [0017] FIG. 6 (b) in accordance with an exemplary embodiment of the present invention illustrates another flow SDN label stack;

[0018]图7依照本发明的另一示例性实施例示出了用于转发SDN流的方法的流程图; [0018] FIG. 7 according to another exemplary embodiment of the present invention shows a flowchart of a method of forwarding SDN stream;

[0019]图8依照本发明的示例性实施例示出了在既有的MPLS核心网上隧道传输SDN流分组的过程;以及 [0019] FIG. 8 in accordance with an exemplary embodiment of the present invention is shown in both the core network of MPLS tunneling process SDN stream packet; and

[0020] 图9依照本发明的示例性实施例示出了用于在MPLS核心网上转发SDN流的设备的示意图。 [0020] FIG. 9 in accordance with an exemplary embodiment of the present invention shows a schematic flow SDN for forwarding the MPLS core network device.

具体实施方式 Detailed ways

[0021] 下面将参照附图来详细描述本发明的实施例。 [0021] Embodiments of the present invention will be described in detail with reference to the accompanying drawings. 贯穿本说明书全文,谈及特征、优点或类似的措辞并非意味着可以利用本发明而实现的所有特征与优点应当在或者是在本发明的任何单个的实施例中。 Throughout all of the features and advantages of the present specification, talking features, advantages, or similar language does not mean that the present invention may be utilized should be realized or are in any single embodiment of the present invention. 相反,要理解涉及特征与优点的措辞意味着结合实施例所描述的具体特征、优点或特性包括在本发明的至少一个实施例中。 Instead, language referring to the features and advantages is understood to mean that a particular feature of the described embodiments, advantage, or characteristic included in at least one embodiment of the present invention. 因而,贯穿本说明书全文,对特征和优点的讨论以及类似的措辞可以指同一实施例,但却不一定指同一实施例。 Accordingly, throughout the present specification, discussions and similar language features and advantages may be referring to the same embodiment, but not necessarily referring to the same embodiment. 此外,所描述的本发明的特征、优点以及特性可以用任何合适的方式合并在一个或多个实施例中。 Further, features of the invention described herein, advantages, and characteristics may be combined in any suitable manner in one or more embodiments. 相关领域的技术人员将会认识到,可以在没有特定实施例的一个或多个具体特征或优点的情况下实践本发明。 Skilled in the relevant art will recognize that the present invention may be practiced in the absence of a particular embodiment one or more features or advantages of a particular situation. 在其它的实例中,可以在某些实施例中实现附加的特征和优点,其不一定出现于本发明的所有实施例之中。 In other instances, additional features may be implemented in certain embodiments and advantages of the embodiments, which do not necessarily appear in all embodiments of the present invention being.

[0022] 需要说明的是,下文中按照本发明实施例的方法、设备、装置、系统和计算机程序产品的流程图和/或框图描述了本发明的多个方面。 [0022] Incidentally, a flowchart of a method embodiment in the following embodiment according to the present invention, apparatus, device, system, and computer program products and / or block diagram depicts various aspects of the present invention. 流程图和/或框图的每个方框以及流程图和/或框图中各方框的组合,都可以由计算机程序指令实现。 And each block of the flowchart or block diagrams, and / compositions / or flowchart illustrations and block diagrams, can be implemented by computer program instructions. 这些计算机程序指令可以提供给通用计算机、专用计算机或其它可编程数据处理装置的处理器,从而生产出一种机器, 使得通过计算机或其它可编程数据处理装置执行的这些指令,产生实现流程图和/或框图中的方框中规定的功能/操作的装置。 These computer program instructions may be provided to a general purpose computer, special purpose computer, a processor or other programmable data processing apparatus to produce a machine, such that the instructions executed by a computer or other programmable data processing apparatus, create means for implementing the flowchart and / or block diagrams predetermined function / operation of the device. 也可以把这些计算机程序指令存储在能指令计算机或其它可编程数据处理装置以特定方式工作的计算机可读介质中,这样,存储在计算机可读介质中的指令产生一个包括实现流程图和/或框图中的方框中规定的功能/操作的指令装置的制造品。 These computer program may be instructions stored in a computer-readable medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, so that instructions stored in a computer-readable medium comprising generating a realization in the flowchart and / or the functions specified in the block diagrams / command devices operation. 还可以把计算机程序指令加载到计算机或其它可编程数据处理装置上,使得在计算机或其它可编程数据处理装置上执行一系列操作步骤,以产生计算机实现的过程,从而在计算机或其它可编程装置上执行的指令就提供实现流程图和/或框图中的方框中规定的功能/操作的过程。 The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps on the computer or other programmable data processing apparatus to produce a computer implemented process, such that in the computer or other programmable apparatus executing instructions provided on the process of implementing the flowchart and / or block diagrams predetermined functions / operations.

[0023]当前SDN概念引起了服务提供商、IT供应商、技术供应商和网络运营商等的广泛兴趣。 [0023] The current concept of cause SDN service providers, IT providers, technology providers and network operators such wide interest. 诸如SDN世界大会、网络功能虚拟化(NFV)白皮书和SDN峰会等的组织和机构都建议考虑将SDN与现有网络和协议(例如,SDN与既有的MPLS核心网)进行耦合。 Such as SDN World Congress, the network function virtualization (NFV) white paper and SDN Summit and other organizations and institutions are recommended to consider the SDN with existing networks and protocols (eg, SDN with existing MPLS core network) coupling. 然而,当前还未提出有效的方案来解决SDN与既有核心网之间进行有效互操作的问题。 Currently, however, it has not yet come up with effective solutions to the problem of effective interoperable with existing core network between SDN. 存在的一种情况是:现有的标签边缘路由器(LER)并不根据SDN流的匹配字段集来区分LSP。 A situation is occurring: the conventional label edge router (LER) is not distinguished according LSP set of matching fields SDN stream. 举例来说,SDN流条目{dst · IP01,src · TCP portl; *}和{dst · IP01,src · TCP port2; *}可指不具有不同匹配字段的两个不同的SDN流,并且要求两个不同的LSP,但是LER却将这两个流当作具有相同的转发等价类(FEC)来进行处理,并通过相同的LSP来转发它们。 For example, SDN flow entry {dst · IP01, src · TCP portl; *} and {dst · IP01, src · TCP port2; *} can refer to two different SDN stream does not match with different fields, and require two the LSP different, but the two streams as they LER have the same forwarding equivalence class (FEC) for processing and forwarding them by the same LSP. 在该例中,在SDN流条目的操作字段(诸如动作集)中的通配符可以表示实施任何操作。 In this embodiment, the operation field SDN flow entry (such as a set of actions) in the embodiment may represent any wildcard operation. 类似地,当在SDN流条目的匹配字段中采用通配符时,其可以表示匹配任何值。 Similarly, when using wildcard matching SDN flow entry in the field, which may represent any value match. 此外,现有的标签边缘路由器并不根据SDN 流的动作集来区分LSP。 Further, the conventional label edge router is not set according to the operation flow SDN distinguished LSP. 举例来说,SDN流条目{dst.IP@l,Action:to central SDN controller}和{dst. IP@1,Action:Normal}可指不具有相同匹配字段但不同动作(action) 的两个不同的SDN流。 For example, SDN flow entry {dst.IP @ l, Action: to central SDN controller} and {dst IP @ 1, Action:. Normal} may refer to a field, but does not have the same match different actions (action) two different the SDN flow. 这两个流要求两个不同的LSP,但是LER却将这两个流当作具有相同的FEC来进行处理,并通过相同的LSP来转发它们。 These two streams requires two different LSP, but LER but the two have the same flow as the FEC to be processed, and forwarded to them by the same LSP. 因此,需要考虑如何对SDN与既有的MPLS核心网进行耦合,旨在解决现有技术中的至少一项问题。 Therefore, it is necessary to consider how to SDN coupled with existing MPLS core networks, designed to solve at least one problem of the prior art.

[0024] 根据本发明的示例性实施例,通过引入SDN流标签栈(SDN-flow label stack),增强了既有的MPLS核心网边缘路由器的标签分组转发方案,从而能够区分在既有的MPLS核心网上对SDN流的递送。 [0024] According to an exemplary embodiment of the present invention, by introducing a stream SDN label stack (SDN-flow label stack), the enhanced packet forwarding scheme existing label edge router MPLS core network, and thus can be distinguished in the existing MPLS the core stream online delivery of SDN. 图1是依照本发明示例性实施例的示意图,其说明了在具有SDN流标签栈和LSP标签栈的情况下在既有的核心网上对SDN流分组的转发。 FIG 1 is a schematic diagram in accordance with an exemplary embodiment of the present invention, which illustrates the case of a flow label stack SDN LSP label stack and forwards the packet to the SDN stream existing in the core network. 根据示例性实施例,SDN转发实体(例如图1中的SDN-FE1)可以将SDN流分组发送到核心网的边缘路由器(例如图1中的LER1),该边缘路由器可以通过引入SDN流标签栈来扩展标签栈空间。 According to an exemplary embodiment, SDN forwarding entity (e.g. SDN-FE1 in FIG. 1) may transmit SDN stream packets to the edge router of the core network (e.g. LER1 in FIG. 1), the edge router can be incorporated SDN flow label stack to expand the label stack space. 如图1所示,该扩展导致了两种标签栈:LSP标签栈和SDN流标签栈。 As shown in FIG 1, which led to two expanded label stack: LSP label stack and SDN flow label stack. 在示例性实施例中,边缘路由器可以将SDN流分组的SDN流条目映射到其相应的SDN流标签栈,并且至少部分地基于SDN流标签栈来确定SDN流的转发等价类(FEC)。 In an exemplary embodiment, the edge router may SDN SDN stream packet flow entry is mapped to its respective SDN flow label stack, at least in part be determined SDN stream forwarding equivalence class (FEC) based SDN flow label stack. 举例来说,SDN流标签栈可以确定出SDN流的FEC,并且还可以确定出该FEC所对应的LSP标签栈。 For example, SDN flow label stack may determine the FEC SDN stream, and may also be determined that the corresponding FEC LSP label stack. 入口边缘路由器(例如图1中的LER1)可以针对SDN流分组来推送(push) SDN流标签栈,并且可以将SDN流分组连同SDN流标签栈和LSP标签栈转发到标签交换路由器(如图1中所示的LSR),并进而转发到出口边缘路由器(例如图1中的LER2)。 Ingress edge router (e.g. LER1 in FIG. 1) may be directed to packet flow SDN push (Push) SDN flow label stack, and may be in conjunction with SDN SDN stream packet stream LSP label stack and stack labels to label switching router forwards (FIG. 1 LSR shown), and thus forwarded to the egress edge router (e.g. LER2 in FIG. 1). 出口边缘路由器可以弹出(pop) SDN流标签栈,并且将所接收到的SDN流分组递送到要去往的SDN 转发实体(例如图1中的SDN-FE2)以及对应的端口。 Egress edge router can be ejected (POP) SDN flow label stack, and the received stream packet SDN delivered to the destined SDN forwarding entity (e.g. FIG. 1 SDN-FE2) as well as the corresponding port. 应当注意,本发明示例性实施例的方案并没有改变在既有的核心网中(不管是在诸如LER1的边缘路由器上还是在诸如LSR的中间路由器上)对标签分组的转发。 It is noted that the exemplary embodiment of the present invention, the embodiment of the label and forwards the packet is not changed in the existing core network (either on the edge, such as a router or LER1 intermediate routers such as the LSR). 实际上,可以按照惯常采用的转发方案那样例如基于LSP标签栈来对数据分组进行转发。 In fact, as can for example be forwarding the data packet forwarding scheme in accordance with commonly used by LSP label stack based. 此外需要指出的是,根据示例性实施例的方案,中间路由器并不需要知道SDN流标签栈的存在。 Further to be noted that, in accordance with an exemplary embodiment of the embodiment, the intermediate routers do not need to know the presence of the label stack SDN stream.

[0025] 图2、图3和图4分别示出了与混合型SDN网络和核心网环境有关的三种场景。 [0025] Figures 2, 3 and 4 shows a hybrid network and a core network SDN environment-related three scenarios. 根据本发明的示例性实施例,SDN-CE和SDN-FE可以分别表示SDN控制实体和SDN转发实体。 According to an exemplary embodiment of the present invention, SDN-CE and SDN-FE can be expressed SDN SDN control entity and forwarding entity. 举例来说,在OpenFlow的情境中,SDN-CE可以是控制器,而SDN-FE可以是OpenFlow交换机。 For example, in the context of OpenFlow, SDN-CE may be a controller, and SDN-FE may be OpenFlow switch.

[0026]图2依照本发明的示例性实施例示出了混合型SDN网络和核心网的场景1。 [0026] FIG 2 according to an exemplary embodiment of the present invention shows a hybrid scenario SDN network and the core network 1. 如图2所示,可以通过核心网(诸如既有的MPLS核心网)来连接两个SDN网络子站。 As shown in FIG. 2, may be connected to two sub-networks SDN station through the core network (such as the existing MPLS core network). 举例来说,单个的SDN-CE 100可以控制两个SDN子站(如图2中所示的SDN子站1和SDN子站2)内的SDN-FE 101 -104。 For example, a single SDN-CE 100 may control SDN two sub-stations (shown in FIG. 2 SDN SDN sub-station 1 and slave station 2) SDN-FE within 101-104. 在核心网中,可以部署边缘路由器(诸如LER105和LER107)以及中间路由器(诸如LSR106、LSR108和LSR109)。 In the core network, the edge router may be deployed (such as LER105 and LER107) and an intermediate router (such as LSR106, LSR108 and LSR109). 图3依照本发明的示例性实施例示出了混合型SDN网络和核心网的场景2。 FIG 3 according to an exemplary embodiment of the present invention shows a hybrid scenario SDN network 2 and core network. 与图2中类似,可以通过核心网(诸如既有的MPLS核心网)来连接两个SDN网络子站(如图3中所示的SDN子站1和SDN子站2)。 Similarly as in FIG. 2, may be connected to two sub-networks SDN station through the core network (such as the existing MPLS core network) (shown in FIG SDN slave station 31 and the slave stations 2 SDN). 然而,不同于图2中所示的场景,在图3中,子级SDN-CE210和子级SDN-CE220分别提供了对SDN子站1和SDN子站2的本地控制功能。 However, different from the scene shown in FIG. 2, in FIG. 3, the child and child SDN-CE210 SDN-CE220 local control functions are provided for SDN sub-sub-station 1 and station 2 SDN. 父级SDN CE200提供了整个SDN网络的全局控制功能。 Parent SDN CE200 provides a global whole SDN network control functions. 图4依照本发明的示例性实施例示出了混合型SDN网络和核心网的场景3。 FIG 4 according to an exemplary embodiment of the present invention shows a hybrid scenario SDN network 3 and the core network. 在图4中,可以通过核心网(诸如既有的MPLS核心网)来连接两个独立的SDN网络(如图4中所示的SDN网络1和SDN网络2)。 In FIG. 4, may be connected to two separate SDN network (SDN network shown in FIG. 1 and SDN network 2) via a core network (such as the existing MPLS core network). SDN-CE310和SDN-CE320分别提供了SDN网络1和SDN网络2的控制功能。 SDN-CE310 and SDN-CE320 control functions are provided SDN SDN network 1 and network 2.

[0027] 在图2-图4中所示出的三种可能的混合型SDN和核心网部署场景中均可实施本发明示例性实施例所提出的SDN流转发方案。 [0027] In the three kinds as shown in Figures 2 to 4 may be a hybrid and SDN core network deployment scenario can be implemented SDN stream forwarding exemplary embodiment of the present exemplary embodiment of the proposed invention. 举例来说,图2中的LER105和LER107可以分别执行图1中LER1和LER2的功能,而图2中的LSR106、LSR108和LSR109可以执行图1中LSR的功能。 For example, in FIG. 2 LER105 LER107 and may be performed separately in FIG LER1 and LER2 function 1, whereas in FIG. 2 LSR106, LSR108 and LSR109 LSR may perform functions in FIG. 根据示例性实施例,在入口边缘路由器LER105处,可以将SDN流(例如图2中的流1、流2或流3)的SDN流条目映射到其相应的SDN流标签栈,并且至少部分地基于SDN流标签栈来确定相应的SDN流的LSP标签栈。 SDN flow entry according to an exemplary embodiment, the ingress edge router LER105 place, may SDN stream (e.g., in FIG. 2 stream 1, stream 2 and stream 3) are mapped to their respective SDN flow label stack, and at least partially determining the corresponding LSP label stack based SDN SDN stream flow label stack. LER105可以将SDN流分组连同相应的SDN流标签栈和LSP标签栈转发到对应的LSR。 LER105 SDN stream packets may be forwarded to the corresponding LSR stream along with the corresponding label stack and SDN LSP label stack. 响应于从LSR接收到SDN流,出口边缘路由器LER107可以弹出SDN流标签栈, 并且至少部分地基于SDN流标签栈来将所接收到的SDN流分组递送到要去往的SDN转发实体以及对应的端口。 Response to receiving from the SDN LSR flow, egress edge router LER107 can pop the label stack SDN stream, and at least partially based on SDN flow label stack to the SDN of the received stream of packets destined for delivery to the forwarding entities and corresponding SDN port. 举例来说,对于来自SDN-FE 101的流1,LER105可以将SDN流分组连同相应的SDN流标签栈和LSP标签栈转发到LSR106。 For example, for flow from SDN-FE 101 of 1, LER105 SDN stream packets may be forwarded to LSR106 SDN stream along with the corresponding label stack and LSP label stack. 对应地,针对来自LSR106的SDN流,LER107可以弹出SDN流标签栈,并且将所接收到的SDN流分组递送到SDN-FE103。 Correspondingly, for the SDN stream from LSR106, LER107 SDN stream can pop the label stack, and the received packet is delivered to the flow SDN SDN-FE103. 在另一例子中,对于来自SDN-FE102的流3,LER105可以将SDN流分组及其SDN流标签栈和LSP标签栈转发到LSR109。 In another example, for flow from the SDN-FE102 3, LER105 may SDN SDN stream packets and an LSP label and the flow label stack to stack forwards LSR109. 相应地,LER107可以将所接收到的SDN流分组递送到SDN-FE104。 Accordingly, LER107 may be received into a packet stream is delivered to the SDN SDN-FE104.

[0028] 根据另一示例性实施例,图2中的LER107可以充当入口边缘路由器并相应地实现图1中LER1的功能,而LER105可以充当出口边缘路由器并相应地实现图1中LER2的功能。 [0028] According to another exemplary embodiment, in FIG. 2 LER107 ingress edge router and may act accordingly functions implemented in LER1 FIG. 1, and may function as the egress edge router LER105 and accordingly functions implemented in LER2 FIG. 在这种情况下,LER107可以将来自SDN子站2的SDN流转发经过核心网而到达SDN子站1。 In this case, LER107 can SDN from the slave station 2 through the core network SDN stream transfer and reaches the slave station 1 SDN. 类似地,根据网络设置,图3中的LER235和图4中的LER335可以实现图1中LER1 (和/或LER2)的功能,而图3中的LER237和图4中的LER337可以实现图1中LER2(和/或LER1)的功能。 Similarly, according to the network settings, LER335 4 in FIG. 3 LER235 and may be implemented in LER1 (and / or LER2) the function of FIG. 1, and FIG 3 LER237 and FIG. 4 LER337 may be implemented in FIG. 1 LER2 (and / or LER1) function. 此外,图3 中的LSR236、LSR238和LSR239以及图4中的LSR336、LSR338和LSR339可以实现图1中LSR的功能。 Further, in FIG. 3 LSR236, LSR238 and LSR239 and in FIG. 4 LSR336, LSR338 and LSR339 LSR functionality may be implemented in FIG. 根据示例性实施例的方案提供了新的改进型标签制定策略,其增强了LER的标签相关功能,但却不需要改变诸如LSR这样的中间路由器,这不仅减少了开发成本,而且降低了设备制造的复杂度,并且极大地消除了对现有网络部署的影响。 Providing the solution according to an exemplary embodiment of a new and improved label develop strategies, which enhances label-related functions LER, but this need not be changed as the LSR intermediate routers, which not only reduces development costs, and reduced manufacturing equipment complexity, and greatly eliminates the impact on existing network deployment.

[0029] 下面的示意性流程图一般作为逻辑流程图来进行阐述。 [0029] The following schematic flow chart generally set forth as logical flow chart. 因此,所示出的顺序和所标记的步骤表示所提出的方法的一个实施例。 Thus, the order shown and labeled steps of the proposed method shows an embodiment. 可以想到在功能、逻辑或效果方面等效于所描述的方法的一个或多个步骤或其部分的其它步骤和方法。 It is contemplated that one or more steps, or portions of the methods and other steps in function, logic, or effect equivalent to the described method. 另外,所采用的格式和符号是为了阐释该方法的逻辑步骤而提供的,并且被理解为并不限制该方法的范围。 Additionally, the format and symbols employed are provided to illustrate the logical steps of the method is provided, and not to be construed as limiting the scope of the method. 尽管在流程图中可以采用各种箭头类型和线条类型,然而它们被理解为并不限制相应的方法的范围。 Although various arrow types and line types in the flowchart, however, they are understood not to limit the scope of the corresponding method. 事实上,某些箭头或其它的连接符可能仅仅用于指示该方法的逻辑流程。 Indeed, some arrows or other connectors may be used to indicate only the logical flow of the method. 另外,特定方法发生的顺序可以按照所示对应步骤的顺序,或者,可以不按照所示对应步骤的顺序。 Additionally, the order in accordance with a particular method occurs may be shown corresponding to the order of steps, or may not be shown according to the order of the corresponding steps.

[0030] 图5依照本发明的示例性实施例示出了用于转发SDN流的方法的流程图。 [0030] FIG. 5 in accordance with an exemplary embodiment of the present invention shows a flowchart of a method of forwarding a stream SDN. 该方法可以在MPLS核心网的入口边缘路由器(诸如图1中的LER1)处实现。 The method may be implemented in the ingress edge router MPLS core network (LER1 as in FIG. 1) at. 在步骤502中,至少部分地基于与SDN流分组相对应的SDN流条目,可以获取用于该SDN流分组的SDN流标签栈。 In step 502, based at least in part SDN SDN stream packets corresponding to the flow entry, it can be used to obtain the label stack SDN SDN flow stream packet. 举例来说,MPLS核心网的入口边缘路由器可以从SDN子站或网络接收到SDN流分组。 For example, ingress edge router MPLS core network may be received from the sub-station or the network to the SDN SDN stream packet. 对于SDN分组, SDN流条目可以包括但不限于匹配字段(例如,以太网源/目的地地址、IP源/目的地地址,以及传输控制协议/用户数据报协议(TCP/UDP)源/目的地端口)以及SDN流的对应操作(诸如动作集所指定的动作)。 For packet SDN, SDN flow entry may include, but are not limited to the match field (e.g., Ethernet source / destination addresses, IP source / destination address, and a transmission control protocol / user datagram protocol (TCP / UDP) source / destination port) and a corresponding operation SDN stream (such as an action specified in the action set). 在示例性实施例中,可以在MPLS网络的边缘路由器(诸如图1中LER1)处维护SDN流条目与SDN流标签栈之间的映射表。 In an exemplary embodiment, may maintain a mapping table between SDN and SDN stream flow entry edge router MPLS label stack of a network (such as the FIG. 1 LER1) at. 下面的表1示出了相应的例子。 The following Table 1 shows the corresponding example.

[0031] 表1:在SDN流条目与SDN流标签栈之间的映射表 [0031] Table 1: SDN flow between SDN flow label stack entries of the mapping table

Figure CN103973568BD00081

[0034] 在表1中,标记"FL"表示"流标签",符号表示通配符。 [0034] In Table 1, the mark "FL" represents a "flow label", the symbol represents a wildcard. 举例来说,在SDN流条目的匹配字段中的符号可以表示匹配任何值;而在SDN流条目的操作(诸如动作)字段中的符号可以表示实施任何操作。 For example, in the symbol stream matching SDN entry field may represent any value match; in operation SDN flow entry (such as an action) field operation symbol may represent any embodiment. 根据SDN流条目与SDN流标签栈之间的映射关系(诸如表1所示的内容),可以将SDN流分组的SDN流条目映射到相应的SDN流标签栈。 The mapping relationship between SDN SDN stream flow label stack entry (such as a table of contents shown in FIG. 1), can flow entry SDN SDN stream mapped to the corresponding packet stream SDN label stack.

[0035] 在步骤504中,可以为SDN流分组确定与其SDN流标签栈相对应的LSP标签栈。 [0035] In step 504, can determine its SDN stream packet flow label stack corresponding LSP label stack of SDN. 在示例性实施例中,可以在MPLS网络的边缘路由器(诸如图1中LER1)处维护SDN流标签栈与LSP 标签栈之间的映射表。 In an exemplary embodiment, may maintain a mapping table between the stack and the flow label SDN LSP label stack in the MPLS network edge router (such as in FIG. 1 LER1) at. 下面的表2不出了相应的例子。 The following Table 2 no corresponding examples.

[0036] 表2:在SDN流标签栈与LSP标签栈之间的映射表 [0036] TABLE 2: SDN flow between the label stack and the stack LSP label mapping table

Figure CN103973568BD00082

Figure CN103973568BD00091

[0038]一在表2中,标记"LL"表示"LSP标签"。 [0038] In Table 2, a mark "LL" represents "LSP label." 利用SDN流标签栈与LSP标签栈之间的映射关系(诸如表2中所描述的内容),可以根据SDN流分组的SDN流标签栈来获得该SDN流分组的LSP标签栈。 Using a mapping relationship (such as described in 2 table of contents) between the stack and the flow label SDN LSP label stack, can be obtained LSP label stack of the packet stream according SDN SDN SDN flow label stack of a packet stream.

[0039] 在步骤506中,至少部分地基于LSP标签栈,可以在MPLS核心网上转发数据分组,其中该数据分组至少包括LSP标签栈、SDN流标签栈和SDN流分组。 [0039] In step 506, at least in part, on an LSP label stack, data packets may be forwarded MPLS core network, wherein the data packet comprises at least LSP label stack, flow label stack and SDN SDN stream packet. 举例来说,至少部分地基于LSP标签栈来在MPLS核心网上转发该数据分组可以包括以下中的至少一项:根据SDN流条目中的匹配字段集来区分对该数据分组的转发;以及根据SDN流条目中的动作集来区分对该数据分组的转发。 For example, at least in part based on the LSP label stack forwards the MPLS core network, the data packet may comprise at least one of the following: to differentiate forwarding of data packets according to the set of matching fields SDN flow entry; and according SDN flow entry set of actions to distinguish the forwarding of data packets. 实际上,由于此处所描述的LSP标签栈是根据与SDN流条目相对应的SDN流标签栈来确定的,因而,根据示例性实施例的LSP标签栈不仅能够反映出SDN流条目的不同匹配字段集,而且还能够反映出SDN流条目的不同动作集,从而使得LER能够根据LSP标签栈区分出具有不同FEC的SDN流分组,以便将各个SDN流分组经由不同的LSP在MPLS核心网上转发给相应的LSR,进而递送到相应的出口边缘路由器。 In fact, since the LSP label stack is described herein in accordance with the corresponding flow entry SDN SDN determined flow label stack, therefore, an LSP label stack according to an exemplary embodiment can not only reflect the different flow entry matching field SDN set, but also reflect the different action set SDN flow entry so that the LER LSP label stack can be distinguished according to the SDN stream packets with different FEC so that the respective flow SDN MPLS packet to the core network via a respective different LSP the LSR, in turn delivered to a respective egress edge router.

[0040] 根据示例性实施例,可以使用预留标签来指示SDN流标签栈,在分组转发的常态情况下并不使用该预留标签。 [0040] According to an exemplary embodiment, the reservation label may be used to indicate SDN flow label stack does not use the reservation label in a normal case of a packet forwarding. 在这种情况下,图5中的步骤506中转发的数据分组可以进一步包括预留标签。 In this case, in step 506 forwards the data packet of FIG. 5 may further include a reservation label. 举例来说,预留标签可以是特定于供应商而预留的标签或者是因特网赋号管理局(IANA)预留的标签。 For example, the label may be reserved for vendor-specific tag or reserved for the Internet Assigned Numbers Authority (IANA) reserved label. 在一个示例性实施例中,用于SDN流分组的MPLS标签栈可以包括以上所描述的LSP标签枝和预留标签。 In one exemplary embodiment, a stream packet SDN MPLS label stack may include branch LSP labels and tags described above reserved. 在该实施例中,预留标签可以位于MPLS标签枝的枝底,并且可以指示尾随该MPLS标签栈的SDN流标签栈。 In this embodiment, the reservation label may be located on the bottom branch branches MPLS label, and may indicate that the trailing label stack of the MPLS label stack SDN stream. 在另一示例性实施例中,用于SDN流分组的MPLS标签枝可以包括LSP标签枝、预留标签和SDN流标签枝。 In another exemplary embodiment, the packet stream for an MPLS label SDN branch LSP label may include branches, the reservation label and the flow label sticks SDN. 在该实施例中,预留标签可以不处在MPLS标签栈的栈底,并且可以指示在该预留标签之后尾随的SDN流标签栈。 In this embodiment, the reservation label in the MPLS label stack may not be the bottom of the stack, and may indicate that the reservation label after the trailing SDN flow label stack.

[0041] 图6 (a)依照本发明的示例性实施例说明了一种SDN流标签栈。 [0041] FIG. 6 (a) in accordance with an exemplary embodiment of the present invention describes a flow label stack SDN. 如图6 (a)所示,可以使用MPLS标签栈底部的一个预留标签来指示SDN流标签栈,相应的栈底(BoS)比特被设置为1,并且SDN流标签栈尾随MPLS标签栈。 FIG 6 (a), the bottom of the MPLS label stack may be used to indicate a reservation label SDN flow label stack, a respective stack bottom (the BoS) bit is set to 1, and a flow label stack trailing SDN MPLS label stack. MPLS标签栈还包括LSP标签栈,其中EXP表示试验用比特,而TTL表示生存期比特。 LSP MPLS label stack further comprises a stack of labels, where EXP represents the test bits, and the bit TTL indicates survival. 图6 (b)依照本发明的示例性实施例说明了另一种SDN流标签栈。 FIG 6 (b) in accordance with an exemplary embodiment of the present invention illustrates another flow label stack SDN. 如图6(b)所示,可以使用MPLS标签栈中的一个预留标签来指示SDN流标签栈,但该预留标签并不处于MPLS标签栈的底部。 FIG 6 (b) can be expressed using the MPLS label stack to indicate a reservation label SDN flow label stack, but not in the reservation label in the MPLS label stack bottom. SDN流标签栈尾随该预留标签并且作为MPLS标签栈的一部分。 SDN flow reservation label stack tag and the trailing part of the MPLS label stack. 举例来说,可以采用作为整型值的预留标签来指示SDN流标签栈,也可以采用预留标签和EXP比特来联合指示SDN流标签栈。 For example, the label may be employed which is reserved to indicate an integer value SDN flow label stack, reservation label may be used jointly and EXP bits indicate SDN flow label stack. 在示例性实施例中,图6 (a) - (b)中的SDN流标签1和SDN流标签2可以分别对应于表1的第1行中的SDN流标签FL100和FL200;相应地,图6 (a) - (b)中的LSP标签1和LSP标签2可以分别对应于表2的第1行中的LSP标签LL300和LL100。 In an exemplary embodiment, FIG. 6 (a) - SDN flow label (b) 1 and SDN flow label 2 may correspond to the first row of Table 1 in SDN flow label FL100 and FL200, respectively; Accordingly, FIG. 6 (a) - LSP label (b) an LSP label 1 and 2 may correspond to one row of table 2 in the LSP label LL300 and LL100.

[0042]图7依照本发明的另一示例性实施例示出了用于转发SDN流的方法的流程图。 [0042] FIG. 7 according to another exemplary embodiment of the present invention shows a flowchart of a method of forwarding a stream SDN. 该方法可以在MPLS核心网的出口边缘路由器(诸如图1中的LER2)处实现。 The method may be implemented in the egress edge router MPLS core network (LER2 as in FIG. 1) at. 在步骤702,响应于在MPLS核心网上接收到数据分组,可以获取SDN流标签栈,其中,该数据分组至少包括SDN流分组以及用于该SDN流分组的LSP标签栈和所述SDN流标签栈。 At step 702, in response to receiving the MPLS packet data core network, may be acquired SDN flow label stack, wherein the data packet includes at least packet stream and for the SDN SDN LSP label stack of the packet flow and the flow label stack SDN . 举例来说,MPLS核心网的出口边缘路由器可以从MPLS核心网中的LSR接收该数据分组。 For example, the egress edge router MPLS core network may receive the data packet from the core network of MPLS LSR. 在采用预留标签来指示SDN流标签栈的情况下,该数据分组可以进一步包括该预留标签。 In the case of reservation tag to indicate SDN flow label stack, the data packet may further include the reservation label. 在一个示例性实施例中,用于SDN流分组的MPLS标签枝包括LSP标签枝和预留标签,其中,预留标签可以位于MPLS标签枝的枝底, 用于指示尾随MPLS标签栈的SDN流标签栈。 In a branch SDN exemplary embodiment, the MPLS label for the branch stream packet comprises SDN branch LSP label and label reservation, wherein the reservation label may be located at the bottom of the MPLS label sticks, for indicating the flow trailing the MPLS label stack label stack. 在另一示例性实施例中,用于SDN流分组的MPLS 标签枝包括LSP标签枝、预留标签和SDN流标签枝,其中,在MPLS标签枝中的该预留标签指不了尾随所述预留标签的SDN流标签栈。 In another exemplary embodiment, a flow SDN MPLS label packet includes branch LSP label sticks, reservation label and the flow label SDN branches, wherein the branch reservation label in the MPLS label can not or that follows the pre- SDN flow label left the label stack. 需要注意的是,该数据分组中的LSP标签栈不同于根据图5所示的方法在MPLS核心网的入口边缘路由器处为该SDN流分组确定的LSP标签栈,这是因为MPLS核心网中的LSR在转发分组的过程中已经对该SDN流分组的LSP标签栈进行了修改(如图8中的S803所示)。 Note that the data packet is different from the label stack LSP LSP label stack of the packet stream SDN determined according to the method shown in FIG. 5 for the ingress edge router of the MPLS core network, since the MPLS core network in the process of LSR in the packet has been forwarded to the SDN stream packet LSP label stack is modified (S803 shown in FIG. 8). 在步骤704,可以至少部分地基于SDN流标签栈来转发SDN流分组。 At step 704, it may be partially forwarded SDN stream packets based on at least SDN flow label stack. 举例来说,核心网的出口边缘路由器可以针对所接收到的数据分组相应地弹出LSP标签栈和SDN流标签栈,并且根据SDN流标签栈来将SDN流分组递送到SDN子站或网络中的分组转发目的地。 For example, the egress edge router of the core network can be correspondingly LSP label stack and pop the label stack SDN stream for the received data packet, and a flow label stack according to the SDN SDN SDN stream packet is delivered to the sub-station or network, packet forwarding destination.

[0043] 以上描述了根据本发明示例性实施例的用于在MPLS核心网上转发SDN流的方法。 [0043] The method described above SDN forwarding the MPLS core network flow according to an exemplary embodiment of the present invention. 应当指出的是,所描述的方法仅为示例,而不是对本发明的限制。 It should be noted that the method described is merely exemplary, and not limiting of the present invention. 本发明的用于实现在MPLS 核心网上转发SDN流的方法可具有更多、更少或不同的步骤,所描述的一些步骤可合并为单个步骤或划分为更细的步骤,且一些步骤之间的顺序可改变或可并行执行。 The present invention for achieving SDN forwarding the MPLS core network flow method may have more, fewer, or different steps, some of the steps described may be combined into a single step, or divided into smaller steps, and some steps between the order may be changed or may be performed in parallel.

[0044]图8依照本发明的示例性实施例示出了在既有的MPLS核心网上隧道传输SDN流分组的过程。 [0044] FIG. 8 in accordance with an exemplary embodiment of the present invention illustrates a process in existing MPLS core network SDN tunneled stream packet. 如图8所示,SDN-FE1可能期望将SDN流分组1(其可以与特定的SDN流条目相关)经由核心网发送到SDN-FE2。 8, SDN-FE1 stream packets may be desirable to SDN 1 (which may be associated with a particular flow entry SDN) to SDN-FE2 via the core network. 在S801,作为SDN流分组1的入口边缘路由器,LER1可以查找其所拥有的关于SDN流条目与SDN流标签栈的映射表,并且取回该SDN流分组所对应的SDN流标签栈(如图8中所示的SDN流标签栈1)。 In S801, as the ingress edge router packet stream SDN 1, LER1 can flow mapping table entry with respect SDN SDN flow label stack in its possession, and retrieves the packet stream corresponding to the SDN SDN flow label stack (FIG. SDN flow label stack 1 shown in FIG. 8). 在S802,根据SDN流标签栈与LSP标签栈之间的映射表, LER1可以得到SDN流分组的LSP标签栈(如图8中所示的LSP标签栈1)。 In S802, according to a mapping table between the stack and the flow label SDN LSP label stack, LER1 obtained SDN LSP label stack stream packet (LSP label stack shown in FIG. 8 a). 在示例性实施例中, LER1可以将LSP标签栈1、预留标签(作为SDN流标签指示)、SDN流标签栈1和SDN流分组1组装在一起,例如成为{LSP标签栈1,预留标签(SDN流标签指示),SDN流标签栈1,SDN流分组1}, 然后根据LSP标签栈1来对其进行转发。 In an exemplary embodiment, LER1 LSP label stack 1 may be reserved label (label stream as indicated SDN), flow label stack 1 and SDN SDN stream packet 1 assembled together, for example, be an LSP label stack 1 {reserved tag (SDN flow label instructions), SDN flow label stack 1, 1} SDN stream packets, and then forward them according to an LSP label stack. 在S803,LSR可以从LER1接收{LSP标签栈1,预留标签(SDN流标签指示),SDN流标签栈1,SDN流分组1}。 In S803, LSR may be received from a label stack LER1 {LSP, the reserved label (SDN flow label instructions), SDN flow label stack 1, 1} SDN stream packet. 举例来说,LSR可以基于LSP标签栈1来实施分组转发,并且将LSP标签栈1修改成LSP标签栈2。 For example, the LSR may be based on an LSP label stack to the packet forwarding embodiment, and the modified LSP label stack 1 into the LSP label stack 2. 相应地,LSR可以将{LSP标签栈2,预留标签(SDN流标签指示),SDN流标签栈1,SDN流分组1}发送给LER2。 Accordingly, the LSR may be {LSP label stack 2, the reservation label (SDN flow label instructions), SDN flow label stack 1, 1} SDN packet stream sent to LER2. 在S804,LER2可以从LSR接收{LSP标签栈2,预留标签(SDN-流标签指示),SDN流标签栈1,SDN流分组1}。 In S804, LER2 may be received from the label stack 2 LSR {LSP, the reserved label (SDN- flow label instructions), SDN flow label stack 1, 1} SDN stream packet. 举例来说,LER2可以弹出LSP标签栈2、预留标签(SDN流标签指示)和SDN流标签栈1,然后可以至少部分地基于SDN流标签栈1来将SDN流分组1发送到SDN-FE2。 For example, LSP LER2 can pop the label stack 2, the reservation label (SDN flow label indicated) and SDN flow label stack 1, then at least in part on an SDN flow label stack to the packet stream 1 is sent to the SDN SDN-FE2 .

[0045] 根据本发明的示例性实施例,对既有的MPLS核心网边缘路由器的标签分组转发方案进行了修改,从而能够在既有的MPLS核心网上区分SDN流。 [0045] According to an exemplary embodiment of the present invention, a packet forwarding scheme existing label edge router MPLS core network has been modified, it is possible to distinguish SDN flow existing MPLS core network. 本发明示例性实施例所描述的方案不仅能够根据不同的SDN流匹配字段集来区分MPLS核心网上的SDN流递送,而且还能够根据不同的SDN流动作集来区分MPLS核心网上的SDN流递送。 Scheme embodiments described in the present exemplary embodiment can not only distinguish MPLS core network according to different flow set of matching fields SDN SDN stream delivery, but can also be set according to different SDN flow to distinguish MPLS core network SDN stream delivery. 在此所提出的解决方案可应用于SDN和MPLS混合型网络的不同部署场景(诸如图2-图4中所示出的场景)。 (4 out of the scenario, such as shown in Figs. 2) solution proposed herein may be applied to hybrid networks MPLS SDN and different deployment scenarios. 在采用示例性实施例描述的解决方案时,仅需要修改边缘路由器,而不需要修改中间路由器。 When using the solution described in the exemplary embodiment, the edge routers only need to be modified, without requiring modification of the intermediate routers. 此外,根据示例性实施例的SDN流标签栈还可以应用于SDN流的流量工程。 Further, according to a flow label stack SDN exemplary embodiments may also be applied to traffic engineering SDN stream.

[0046]图9依照本发明的示例性实施例示出了用于在MPLS核心网上转发SDN流的设备的示意图。 [0046] FIG. 9 in accordance with an exemplary embodiment of the present invention shows a schematic flow SDN for forwarding the MPLS core network device. 需要注意的是,图9仅示意性地示出了参与SDN流转发的第一设备910和第二设备920及其主要模块。 Note that in FIG. 9 only schematically shows a first device 910 and second device 920 and the main modules involved in the SDN stream transfer. 应当指出的是,所描述的第一设备910和第二设备920仅为示例,而不是对本发明的限制。 It should be noted that the first device 910 and second device 920 described is merely exemplary, and not limiting of the present invention. 根据本发明示例性实施例的第一设备910和第二设备920可具有比所描述的更多、更少或不同的功能模块,所描述的一些功能模块可合并在一起,或进一步划分,或具有不同的连接关系和包含关系,所有这些变化均处于本发明的精神和范围之内。 A first exemplary embodiment of the apparatus of the present invention 910 and second device 920 may have more than depicted, fewer, or different functional modules, functional blocks described may be combined together according to, or further divided, or having different connections and containment relationships for all such variations are within the spirit and scope of the invention.

[0047] 如图9所示,第一设备910 (诸如MPLS核心网的入口LER)可以包括获取模块912、确定模块914和转发模块916。 [0047] As shown in FIG 9, a first device 910 (such as an ingress LER MPLS core network) may include an acquisition module 912, a determining module 914 and a forwarding module 916. 在示例性实施例中,获取模块912可被配置以便至少部分地基于与SDN流分组相对应的SDN流条目,获取用于该SDN流分组的SDN流标签栈。 In an exemplary embodiment, the acquisition module 912 may be configured to at least partially on the flow entry SDN SDN packets corresponding to flow, acquires a SDN flow label stack of the packet stream SDN. 确定模块914可被配置以便为SDN流分组确定与该SDN流标签栈相对应的LSP标签栈。 Determination module 914 may be configured to determine the SDN stream packet flow label stack corresponding LSP label stack of SDN. 转发模块916可被配置以便至少部分地基于LSP标签栈,在MPLS核心网上转发数据分组,其中,该数据分组至少包括LSP标签栈、SDN流标签栈和SDN流分组。 Forwarding module 916 may be configured so as to partially based LSP label stack in the MPLS forwarding data packets of at least the core network, wherein the data packet comprises at least LSP label stack, flow label stack and SDN SDN stream packet. 第二设备920 (诸如MPLS核心网的出口LER)可以包括获取模块922和转发模块924,如图9所示。 The second device 920 (such as an MPLS core network outlet LER) may include obtaining module 922 and a forwarding module 924, as shown in FIG. 根据示例性实施例,获取模块922可被配置以便响应于在MPLS核心网上接收到数据分组,获取SDN流标签栈,其中,该数据分组至少包括SDN流分组以及用于该SDN流分组的LSP标签栈和SDN流标签栈。 According to an exemplary embodiment, the acquisition module 922 may be configured in response to receiving a data packet to the MPLS core network, obtaining SDN flow label stack, wherein the data packet includes at least packet flow and SDN LSP label for the packet flow SDN SDN stack and flow label stack. 转发模块924可被配置以便至少部分地基于SDN流标签栈来转发SDN流分组。 Forwarding module 924 may be configured to at least partially flow to forward packets based on SDN SDN flow label stack. 在示例性实施例中,可以采用如结合图5-图8所描述的预留标签(诸如在MPLS标签栈中的预留标签)来指示SDN流标签栈。 In an exemplary embodiment, as described in conjunction with FIGS. 5 reservation label (such as a reservation label in the MPLS label stack) is indicated 8 as described SDN flow label stack may be employed. 举例来说,该SDN流标签栈可以尾随MPLS标签栈或者作为MPLS标签栈的一部分。 For example, the stack may trailing SDN flow label or as part of the MPLS label stack of the MPLS label stack.

[0048] 应当理解,图9所述的结构框图仅仅为了示例的目的而示出的,而不是对本发明范围的限制。 [0048] It should be understood that the block diagram of FIG. 9 for purposes of example only and illustrated, and not to limit the scope of the present invention. 在某些情况下,可以根据具体情况而增加或者减少某些模块、装置或设备。 In some cases, it may be increased or decreased certain modules, apparatus, or device depending on the circumstances. 附图中的流程图和框图,图示了按照本发明各种实施例的方法、装置和计算机程序产品的可能实现的体系架构、功能和操作。 The flowchart and block diagrams in the Figures illustrate the architecture in accordance with various embodiments of the present invention, a method embodiment, apparatus, and computer program products may implement the functions and operations. 在这点上,流程图或框图中的每个方框可以代表一个模块、 程序段或代码的一部分,所述模块、程序段或代码的一部分包含一个或多个用于实现规定的逻辑功能的可执行指令。 In this regard, the flowchart or block diagrams may represent a portion of each block in a module, segment, or portion of code, a module, segment, or portion of code that comprises one or more devices for implementing the specified logical function executable instructions. 也应当注意,在有些作为替换的实现中,方框中所标注的功能也可以以不同于附图中所标注的顺序发生。 It should also be noted that, in some implementations Alternatively, the functions noted in the block may be different from the order noted in the figures occur. 例如,两个接连地表示的方框实际上可以基本并行地执行,它们有时也可以按相反的顺序执行,这依所涉及的功能而定。 For example, two blocks shown in succession may in fact be executed substantially concurrently, they may sometimes be executed in the reverse order, depending upon the functionality involved may be.

[0049] 可以用硬件、软件、固件或其组合的方式实现本发明。 [0049] The invention may be implemented in hardware, software, firmware, or a combination thereof embodiment. 适于实现文中所描述的方法的任何计算机系统或其它装置都是合适的。 Any computer system or other apparatus adapted for the method herein described implementations are suitable. 一种典型的硬件和软件的组合可以是含有计算机程序的通用计算机系统,当该计算机程序被加载和执行时,其控制该计算机系统而使其执行文中所描述的方法的步骤,或者构成根据本发明的实施例的装置和系统中的功能模块。 A typical combination of hardware and software may be a general purpose computer system comprising a computer program, the computer program, when being loaded and executed, controls the computer system to perform the method steps described herein and it, or according to the configuration apparatus and system according to the embodiment of the invention the functional module. 本发明还可以体现在计算机程序产品中,该计算机程序产品含有使得能够实现文中所描述的方法的所有特征,并且当其被加载到计算机系统中时,能够执行这些方法,或者构成根据本发明的实施例的装置和系统中的功能模块。 The present invention may also be embodied in a computer program product, the computer program product comprising all the features methods herein described can be achieved, and when it is loaded into a computer system, capable of performing the methods, or forms according to the present invention. apparatus and system according to the embodiment of the functional module.

[0050] 尽管已经公开了本发明的具体实施例,然而本领域的普通技术人员应该理解在不背离本发明的精神和范围的情况下可以对具体的实施例进行改变。 [0050] Although specific embodiments have been disclosed embodiments of the present invention, however, those of ordinary skill in the art should be understood that changes may be made in the specific embodiments without departing from the spirit and scope of the invention. 因此,本发明的范围并不限于具体的实施例,并且其旨在所附权利要求涵盖本发明范围内的任何以及所有这样的应用、修改和实施例。 Accordingly, the scope of the present invention is not limited to the specific embodiments, and it is intended that the appended claims cover any and all such applications within the scope of the present invention, modifications and embodiments.

Claims (15)

1. 一种用于转发软件定义网络流的方法,所述方法包括: 至少部分地基于与软件定义网络流分组相对应的软件定义网络流条目,获取用于所述软件定义网络流分组的软件定义网络流标签栈; 为所述软件定义网络流分组确定与所述软件定义网络流标签栈相对应的标签交换路径标签栈;以及至少部分地基于所述标签交换路径标签栈,在多协议标签交换核心网上转发数据分组,其中,所述数据分组至少包括所述标签交换路径标签栈、所述软件定义网络流标签栈和所述软件定义网络流分组。 1. A method for forwarding a software-defined network flow, the method comprising: at least partially based on software-defined network entry flow network defined stream packets corresponding to the software, the software acquires a software-defined network packet stream network flow is defined label stack; determining a packet stream with the software defined network flow label stack corresponding label switched path label stacks for the software-defined network; and at least in part on said label switched path label stack, multi-protocol label switched core network to forward data packets, wherein the data packet comprises at least a label switched path label stack, a software-defined network and the flow label stack software-defined network packet stream.
2. 根据权利要求1的方法,其中,用于所述软件定义网络流分组的多协议标签交换标签栈包括所述标签交换路径标签栈和预留标签,并且其中,在所述多协议标签交换标签栈的栈底的所述预留标签指示了尾随所述多协议标签交换标签栈的所述软件定义网络流标签栈。 2. The method of claim 1, wherein a plurality of said software defined network protocol label switching packet stream comprising the label stack label switched path label stack and reservation label, and wherein, in said Multiprotocol Label Switching label stack bottom of the stack the reservation label indicates that the label stack software-defined network flow trailing the MPLS label stack.
3. 根据权利要求1的方法,其中,用于所述软件定义网络流分组的多协议标签交换标签栈包括所述标签交换路径标签栈、预留标签和所述软件定义网络流标签栈,并且其中,在所述多协议标签交换标签栈中的所述预留标签指示了尾随所述预留标签的所述软件定义网络流标签栈。 3. The method of claim 1, wherein a plurality of said software-defined network protocol stream packet label switching label stack comprising said label switched path label stack, the reservation label and the flow label stack software-defined network, and wherein the reservation label in the MPLS label stack indicates the reservation of the trailing label the flow label stack software-defined network.
4. 根据权利要求1-3中任何一项所述的方法,其中,至少部分地基于所述标签交换路径标签栈来在所述多协议标签交换核心网上转发所述数据分组包括以下中的至少一项: 根据所述软件定义网络流条目中的匹配字段集来区分对所述数据分组的转发;以及根据所述软件定义网络流条目中的动作集来区分对所述数据分组的转发。 4. The method according to any of claims 1-3, wherein, at least in part on the label switched path label stack to forward the data in the multi-protocol label switching packet core network comprises at least a: the set of matching fields of said software defined network to distinguish the flow entry for forwarding the data packet; and differential forwarding of the data packet stream according to the software-defined network entry operation set.
5. -种用于转发软件定义网络流的设备,所述设备包括: 获取模块,其被配置以便至少部分地基于与软件定义网络流分组相对应的软件定义网络流条目,获取用于所述软件定义网络流分组的软件定义网络流标签栈; 确定模块,其被配置以便为所述软件定义网络流分组确定与所述软件定义网络流标签栈相对应的标签交换路径标签栈;以及转发模块,其被配置以便至少部分地基于所述标签交换路径标签栈,在多协议标签交换核心网上转发数据分组,其中,所述数据分组至少包括所述标签交换路径标签栈、所述软件定义网络流标签栈和所述软件定义网络流分组。 5. - Species apparatus for flow forwarding software-defined network, said apparatus comprising: an acquisition module configured to at least partially define a network-based software-defined network entry flow stream packets corresponding to the software, to obtain the software-defined network software defined network stream packet flow label stack; determining module configured to determine a flow label defined network stack software and the corresponding label switched path label stacks for the software-defined network packet stream; and a forwarding module , which is configured to partially based on the label switched path label stack in the MPLS forwarding data packets of at least the core network, wherein the data packet comprises at least a label switched path label stack, the software defined network flow label stack software-defined network and the packet stream.
6. 根据权利要求5的设备,其中,用于所述软件定义网络流分组的多协议标签交换标签栈包括所述标签交换路径标签栈和预留标签,并且其中,在所述多协议标签交换标签栈的栈底的所述预留标签指示了尾随所述多协议标签交换标签栈的所述软件定义网络流标签栈。 6. The apparatus according to claim 5, wherein a plurality of said software-defined network protocol label switching packet flow label stack includes labels said label switched path and reservation label stack, and wherein, in said Multiprotocol Label Switching label stack bottom of the stack the reservation label indicates that the label stack software-defined network flow trailing the MPLS label stack.
7. 根据权利要求5的设备,其中,用于所述软件定义网络流分组的多协议标签交换标签栈包括所述标签交换路径标签栈、预留标签和所述软件定义网络流标签栈,并且其中,在所述多协议标签交换标签栈中的所述预留标签指示了尾随所述预留标签的所述软件定义网络流标签栈。 7. The apparatus according to claim 5, wherein a plurality of said software-defined network protocol label switching packet stream comprising the label stack label switched path label stack, the reservation label and the flow label stack software-defined network, and wherein the reservation label in the MPLS label stack indicates the reservation of the trailing label the flow label stack software-defined network.
8. 根据权利要求5-7中任何一项所述的设备,其中,至少部分地基于所述标签交换路径标签栈来在所述多协议标签交换核心网上转发所述数据分组包括以下中的至少一项: 根据所述软件定义网络流条目中的匹配字段集来区分对所述数据分组的转发;以及根据所述软件定义网络流条目中的动作集来区分对所述数据分组的转发。 8. The apparatus as claimed in any of claims 5-7, wherein, at least in part on the label switched path label stack of the core network to forward the data exchange packet comprises at least the multi-protocol label a: the set of matching fields of said software defined network to distinguish the flow entry for forwarding the data packet; and differential forwarding of the data packet stream according to the software-defined network entry operation set.
9. 根据权利要求5-7中任何一项所述的设备,其中,所述设备包括所述多协议标签交换核心网的入口标签边缘路由器。 9. The apparatus as claimed in any of claims 5-7, wherein said apparatus comprises an inlet Multiprotocol Label Switching label edge router of the core network.
10. -种用于转发软件定义网络流的方法,所述方法包括: 响应于在多协议标签交换核心网上接收到数据分组,获取软件定义网络流标签栈,其中,所述数据分组至少包括软件定义网络流分组以及用于所述软件定义网络流分组的标签交换路径标签栈和所述软件定义网络流标签栈;以及至少部分地基于所述软件定义网络流标签栈来转发所述软件定义网络流分组。 10. The - method for forwarding a software-defined network flow, the method comprising: in response to multi-protocol label switching core network data packet is received, obtaining a flow label stack software-defined network, wherein the data packet comprises at least a software defines a packet network flow, and a label switched path label stack and the flow label software-defined network stack software-defined network for the packet stream; and at least in part on the flow label stack software-defined network to forward said software defined network stream packet.
11. 根据权利要求10的方法,其中,用于所述软件定义网络流分组的多协议标签交换标签栈包括所述标签交换路径标签栈和预留标签,并且其中,在所述多协议标签交换标签栈的栈底的所述预留标签指示了尾随所述多协议标签交换标签栈的所述软件定义网络流标签栈。 11. The method according to claim 10, wherein a plurality of said software-defined network protocol label switching packet flow label stack includes labels said label switched path and reservation label stack, and wherein, in said Multiprotocol Label Switching label stack bottom of the stack the reservation label indicates that the label stack software-defined network flow trailing the MPLS label stack.
12. 根据权利要求10的方法,其中,用于所述软件定义网络流分组的多协议标签交换标签栈包括所述标签交换路径标签栈、预留标签和所述软件定义网络流标签栈,并且其中,在所述多协议标签交换标签栈中的所述预留标签指示了尾随所述预留标签的所述软件定义网络流标签栈。 12. The method according to claim 10, wherein a plurality of said software-defined network protocol label switching packet stream comprising the label stack label switched path label stack, the reservation label and the flow label stack software-defined network, and wherein the reservation label in the MPLS label stack indicates the reservation of the trailing label the flow label stack software-defined network.
13. -种用于转发软件定义网络流的设备,所述设备包括: 获取模块,其被配置以便响应于在多协议标签交换核心网上接收到数据分组,获取软件定义网络流标签栈,其中,所述数据分组至少包括软件定义网络流分组以及用于所述软件定义网络流分组的标签交换路径标签栈和所述软件定义网络流标签栈;以及转发模块,其被配置以便至少部分地基于所述软件定义网络流标签栈来转发所述软件定义网络流分组。 13. - a kind of software-defined network device forwards the stream, the apparatus comprising: an acquisition module, which is configured to in response to multi-protocol label switching core network data packet is received, obtaining a flow label stack software-defined network, wherein the data packet comprises at least a software-defined network and a packet flow a label switched path label stack of the packet stream defined network software and the software defined network flow label stack; and a forwarding module, configured to at least partially based on the said software-defined network flow label stack software-defined network forwarding the packet stream.
14. 根据权利要求13的设备,其中,用于所述软件定义网络流分组的多协议标签交换标签栈包括所述标签交换路径标签栈和预留标签,并且其中,在所述多协议标签交换标签栈的栈底的所述预留标签指示了尾随所述多协议标签交换标签栈的所述软件定义网络流标签栈。 14. The apparatus according to claim 13, wherein a plurality of said software-defined network protocol label switching packet flow label stack includes labels said label switched path and reservation label stack, and wherein, in said Multiprotocol Label Switching label stack bottom of the stack the reservation label indicates that the label stack software-defined network flow trailing the MPLS label stack.
15. 根据权利要求13的设备,其中,用于所述软件定义网络流分组的多协议标签交换标签栈包括所述标签交换路径标签栈、预留标签和所述软件定义网络流标签栈,并且其中,在所述多协议标签交换标签栈中的所述预留标签指示了尾随所述预留标签的所述软件定义网络流标签栈。 15. The apparatus of claim 13, wherein a plurality of said software-defined network protocol label switching packet stream comprising the label stack label switched path label stack, the reservation label and the flow label stack software-defined network, and wherein the reservation label in the MPLS label stack indicates the reservation of the trailing label the flow label stack software-defined network.
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