CN101133407B - 带有伸缩的广播和服务实例域的城域以太网 - Google Patents

带有伸缩的广播和服务实例域的城域以太网 Download PDF

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CN101133407B
CN101133407B CN200680006785.7A CN200680006785A CN101133407B CN 101133407 B CN101133407 B CN 101133407B CN 200680006785 A CN200680006785 A CN 200680006785A CN 101133407 B CN101133407 B CN 101133407B
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阿里·萨嘉西
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • 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]
    • H04L12/2852—Metropolitan area networks
    • 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
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H04L12/4645—Details on frame tagging
    • 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
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H04L12/4645—Details on frame tagging
    • H04L12/465—Details on frame tagging wherein a single frame includes a plurality of VLAN tags
    • 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
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H04L12/4645—Details on frame tagging
    • H04L12/465—Details on frame tagging wherein a single frame includes a plurality of VLAN tags
    • H04L12/4662—Details on frame tagging wherein a single frame includes a plurality of VLAN tags wherein a VLAN tag represents a service instance, e.g. I-SID in PBB
    • 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
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H04L12/4675—Dynamic sharing of VLAN information amongst network nodes
    • H04L12/4683—Dynamic sharing of VLAN information amongst network nodes characterized by the protocol used
    • H04L12/4691—GVRP [GARP VLAN registration protocol]
    • 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
    • H04L45/16—Multipoint routing
    • 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

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

Abstract

一种用于核心网的供应商边缘设备的操作方法包括从接入网接收客户帧，所述客户帧具有第一预定比特长度的第一虚拟局域网(VLAN)标签。所述第一VLAN标签包括服务实例标识符。所述第一VLAN标签的服务实例标识符随后被映射到具有大于第一预定比特长度的第二预定比特长度的第二VLAN标签中。

Description

带有伸缩的广播和服务实例域的城域以太网
相关申请的交叉引用
本申请涉及如下的未决申请：题为“System And Method For DSLSubscriberIdentification Over Ethernet Network”的申请；题为“AComprehensive Model ForVPLS”的申请；以及题为“Scalable System AndMethod For DSL Subscriber TrafficOver An Ethernet Network”的申请，这些申请已经转让与本申请的受让人。
技术领域
本发明一般地涉及数字计算机网络技术；更具体地，涉及用于提供城域以太网(Ethernet)服务的方法和装置。
背景技术
以太网是一种基于在发送消息的网络上的对等体的概念而发起的技术，这种网络本质上是普通导线或信道。每一对等体具有被称作媒体访问控制(MAC)地址的全局唯一密钥，以确保以太网中的所有***具有不同的地址。大部分现代的以太网安装采用以太网交换机(也被称作“网桥”)来实现提供到附接设备的连通性的以太网“云(cloud)”或“安全岛(island)”。交换机充当智能数据流量转发器，其中帧被发送到目的地设备被附接到的端口。在美国专利No.6,850,542、No.6,813,268和No.6,850,521中可找到用于以太网网络环境中的网络交换机的示例。
IEEE 802.1Q规范定义了用于虚拟局域网(VLAN)的标准。广播(broadcast)和多播(multicast)帧受VLAN边界的约束，从而使只有其端口是同一VLAN的成员的那些设备能看见那些帧。由于IEEE 802.1QVLAN通常跨越许多跨区域共享(area common)网络的网桥，因此VLAN的标识通过在以太网帧中***标签来获得。例如，根据现有标准，唯一地标识VLAN的12比特标签可以***在以太网帧中。这个VLAN标签可用来指定广播域并标识与特定VLAN相关联的客户。客户标识符通常被称为服务实例(service instance)域，这是因为其标识了向特定客户提供的服务。在服务供应商(SP)城域以太网中，广播域约束了网络设备之间的流量的范围，以使得数据分组不被多播到连接到网络的所有设备。在美国专利No.6,839,348中公开了用于有效地在被配置具有一个或多个VLAN域的计算机网络内分发多播消息的***和方法。
广播和服务实例域的概念在图1中示出，图1示出包含多个互连的交换机的SP城域以太网10。位于网络10***的三个供应商边缘(PE)设备与两个不同客户连接，这两个客户分别由标记为CE1和CE2的客户边缘(CE)设备代表。广播域(即CE1)由粗线示出，其定义了针对在各个客户站点之间发送的流量的特定交换机和路径或经过交换机的跨度。服务实例定义了与给定数据分组相关联的特定客户，例如，与关联到设备CE2的客户相区别的CE1站点的客户。注意，在图1的示例中，两个客户使用同一广播域。与特定客户相关联的流量被服务实例标签标识符唯一地标识。
图2示出通常用于在城域以太网上发送帧的两种数据分组格式。数据分组格式11遵守IEEE 802.1Q规范，并包含客户MAC地址字段，该地址字段后面是用于指定广播域和服务实例二者的12比特VLAN标签。客户数据有效载荷在VLAN标签下面示出。(数据分组最上面的部分经常也被称为“最外面”的部分，最下面的部分被同义地称为“最里面”的部分。)12比特VLAN标签字段意味着IEEE 802.1Q标准可支持多达4,094个广播域和服务实例域的合并总数。例如，IEEE 802.1Q标准可支持4,094个广播域(每个广播域对应于单个服务实例域)或具有4,094个服务实例域的单个广播域。作为又一示例，美国专利No.6,430,621教导了用于利用基于IEEE 802.1Q的帧标签通过基于端口的VLAN分组(grouping)对多个VLAN中的节点分组的方法和装置。
数据分组格式12对应于所提议的IEEE 802.1ad规范，该规范支持所谓的“Q_in_Q”封装或标签层叠(stacking)机制。根据这一草案标准，每个数据分组包含上部(即外部)12比特标签，该标签指定多达4,094个广播域(或VLAN)的其中之一；以及下部(即内部)标签，该标签标识多达4,094个服务实例的其中之一。因此，提议的IEEE 802.1ad标准通过允许每个广播域(每个VLAN)包含多达4,094个服务实例，减少了IEEE802.1Q标准固有的一些容量限制。但是，尽管802.1ad草案标准能够满足许多多点(multipoint)应用，但是对于单个设备能够在单个广播域内复用/解复用几万或几十万个服务实例的点到点(point-to-point)应用来讲仍然不够充分。此外，城域网(Metro Area Network，MAN)/WAN应用中广播域的数目很容易超过4K的限制。另外，某些应用要求终端用户MAC地址和/或终端用户的帧校验和(FCS)通过MAN/WAN以太网来隧道定向(tunnel)，这一特征不被802.1ad提议支持。
北电网络公司提出了被称为“MAC-in-MAC”的方法，来尝试解决现有技术中固有的缺陷。然而北电的提议是基于平面VLAN域(即，没有VLAN标签层叠)，并且具有一些缺点。首先，MAC-in-MAC方法不区分广播域和服务实例域；因此，如果服务实例的数目远远大于要求的广播域的数目，则网络节点(即，交换机、网桥、路由器等)将会负担支持像服务实例一样多的广播域的任务。由于支持广播域比支持服务实例需要更多硬件/软件密集型资源，因此带宽被消耗并且网络成本增大。另外，MAC-in-MAC方法缺乏与802.1ad网桥的互操作性；缺少能够支持数百万个广播域的可行实施方案；还要求网络内的所有网桥(而不只是边缘网桥)具有MAC-in-MAC能力。
作为进一步的背景，美国专利No.6,789,121公开了通过共享的网络基础设施提供虚拟专用网(VPN)服务的方法。所述网络基础设施包含具有CE接口的互连的PE设备。一些CE接口被分配给支持多个VLAN的VPN，并且被设置为与相应CE设备交换流量数据单元，每个流量数据单元包含一个VLAN标识符。共享的网络基础设施中的虚拟连接(VirtualConnection，VC)是根据已知的VPN标识符和由PE设备得知或发现的VLAN标识符直接得出的。美国专利No.6,484,209教导了一种被配置为基于第一相关数据集转发多播数据的***，其中第一相关数据集将多播组标识符映射到作为相应多播组的成员的端口。交换机核心包括将多播组标识符映射到包含成员端口的I/O卡的第二相关数据集。
因此，所需要的是既能适应MAN/WAN以太网的广播域和服务实例数目的不断扩充又能同时克服过去方法的缺点的替代方法和装置。
附图说明
本发明将从下面的具体实施方式和附图中得到更完全的理解，然而，附图不应被理解为将本发明限定于所示出的具体实施例，而仅是用于说明和理解目的。
图1是用于互连多个客户站点的服务供应商网络的图。
图2图示两种不同的现有技术的数据分组格式。
图3示出本发明的扩展VLAN格式的一个实施例。
图4图示根据本发明的一个实施例扩展VLAN机制被用作服务实例标识符的情形。
图5图示根据本发明的另一个实施例扩展VLAN机制被用作服务实例标识符的情形。
图6图示根据本发明的又一个实施例扩展VLAN机制被用作服务实例标识符的情形。
图7图示根据本发明的一个实施例扩展VLAN机制被用作广播域标识符和服务实例标识符二者的情形。
图8图示根据本发明的另一个实施例扩展VLAN机制被用作广播域标识符和服务实例标识符二者的情形。
图9图示根据本发明的又一个实施例扩展VLAN机制被用作广播域标识符和服务实例标识符二者的情形。
具体实施方式
描述了一种扩展VLAN(extended VLAN，E-VLAN)机制，所述机制能在广播域和服务实例域之间加以区分，并扩充以太网MAN/WAN应用中的广播域和服务实例域的数目。为了全面地理解本发明，在以下的描述中提出了诸如设备类型、协议、配置等之类的具体细节。然而，网络技术领域内的普通技术人员应理解实践本发明可能不需要这些具体细节。
计算机网络是用于在诸如中间节点和末端节点之类的节点之间传输数据的互联子网的地理上分布的集合(collection)。局域网(LAN)是这样的子网的示例；多个LAN还可通过诸如路由器、网桥或交换机之类的中间网络节点互连，从而扩展计算机网络的有效“大小”并增加通信节点的数目。末端节点的示例可包含服务器和个人计算机。这些节点一般通过根据预定协议交换离散的数据帧或分组进行通信。在此申请的上下文中，协议由一组定义节点彼此之间如何进行交互的规则组成。
每一节点一般包括多个基本子***，所述基本子***包含处理器子***、主存储器以及输入/输出(I/O)子***。数据经由存储器总线在主存储器(“***存储器”)和处理器子***之间传送，并且经由***总线在处理器和I/O子***之间传送。***总线的示例可包含传统的瞬间数据传输(lightning data transport)(或超传输)总线，以及传统的外设组件【计算机】互联(PCI)总线。处理器子***可包括支持一条或多条***总线及直接存储器访问(DMA)引擎的单片处理器，以及结合一组包含***存储器控制器的功能的控制器设备。通常，单片设备是出于通用目的设计的，并未针对网络应用进行明显的优化。
在典型的网络应用中，从诸如附接到***总线的I/O子***的以太网媒体访问控制(MAC)控制器之类的成帧器(framer)接收分组。MAC控制器中的DMA引擎在***存储器中设有其可访问的缓冲器地址列表(例如，以***存储器中的描述符环(ring)的形式)。由于在MAC控制器处接收到每一分组，所以DMA引擎获得***总线的所有权(“控制”)，从而访问下一描述符环以获得***存储器中的下一缓冲器地址，它可以例如将包含在分组中的数据存储(“写入”)在所述缓冲器地址处。DMA引擎可能需要经由***总线发布许多写操作从而传送所有的分组数据。
图3示出根据本发明的一个实施例的E-VLAN标签格式。与E-VLAN相关联的以太类型(Ethertype)可用来识别以太网帧中的这种扩展标签。E-VLAN标签格式的关键特征是20比特的VLAN ID/服务ID字段，该字段在某些应用中允许多达一百万个不同服务实例的识别。标签中还包括4比特的服务类别(CoS)字段、适合丢弃(D)比特、FCS(F)比特、客户MAC地址封装(M)比特，以及指示数据分组格式中使用VLAN层叠的层叠(S)比特。M比特的设置指示包括客户的MAC地址在内的整个客户帧被封装在以太网帧中。在设置了M比特的情况下，供应商MAC地址被用于通过SP网络来进行隧道定向。后两个特征将在下面更详细地讨论。
正如不久将显而易见的那样，E-VLAN标签机制可用在许多不同应用中。例如，当E-VLAN标签被用作服务实例标识符时，E-VLAN标签可以嵌入在IEEE 802.1ad帧内，代替通常与802.1ad帧相关联的内部标签。在这种应用中，可以有4,094个广播域，每个广播域支持多达一百万个服务实例。在给定的服务实例要求其自己的广播域的应用中(即，一对一通信)，单个E-VLAN标签可以同时用作广播域标识符和服务实例标识符。在这种应用中，E-VLAN标签是以太网帧中的唯一标签。
在其他情况中，可以使用两个E-VLAN标签(即，一个作为广播域标识符，另一个作为服务实例域标识符)。在这种应用中，E-VLAN标签被嵌套(nest)，以便使外部标签(outertag)代表广播域，内部标签(innertag)代表服务实例。这些类型的应用的示例包括存在上万个广播域并且每个广播域有多达一百万个服务实例的情况。注意，在E-VLAN标签被嵌套的应用中，可以使用单个以太类型，并且S比特将被设置为指示标签层叠。
对于要求保留FCS的应用，本发明的扩展E-VLAN标签还可用来指示以太网帧是否包含终端用户的FCS；同样，对于要求MAC隧道定向的应用，可用来识别以太网帧何时包含终端用户的MAC地址。
图4图示根据本发明的一个实施例的扩展的VLAN机制被用作跨以太网服务供应商网络的服务实例标识符的情形。图4的服务供应商网络包括以太网核心网20，所述核心网20被示为分别经网络供应商边缘(n-PE)设备32和33连接到一对以太网接入网21和22。面向用户的供应商边缘(u-PE)设备31和34将相应的客户边缘(CE)设备41和42连接到以太网接入网21和22。数据分组格式图是在每个相应的网络连接在CE设备41和42之间延伸的情况下示出的。
根据图4的实施例，由CE设备41发送的客户帧以与802.1Q规范一致的数据分组格式到达u-PE设备31，该格式包括客户MAC头部、客户VLAN标签、第二层协议数据单元(L2PDU)客户有效载荷以及客户FCS。该例中，接入网21是Q-in-Q网络，从而使当客户帧到达时，u-PE设备31为跨网络21的连接添加标识服务实例和广播域的另一个12比特的VLAN标签。当数据分组到达核心网20的边缘时，n-PE设备32通过取出从u-PE设备31接收到的服务实例标识符并将其映射到E-VLAN(20比特)标签，来附加数据分组。此刻单独的VLAN标签也可添加到E-VLAN顶部，以指定跨越核心网20的广播域。(网络领域专业人员会理解，经过核心网20的广播域与接入网21和22的广播域是分开的且不同的。)
穿过图4的右侧(从核心网20到CE设备42)的流量遵循相反的过程。即，n-PE设备33从接收到的数据分组中剥离VLAN(广播)和E-VLAN(服务)标签；将20比特的E-VLAN服务实例标识符映射到指定针对接入网22的广播域和服务实例域的12比特VLAN。类似地，u-PE设备34在向CE设备42转发前从Q-in-Q数据分组中剥离VLAN(广播和服务)。
应意识到图4的实施例中示出的每个u-PE和n-PE设备都被配置为既对沿着从CE设备到核心网20的方向前进的帧进行附加(添加适当的标签)，又对沿着从核心网20到CE设备的方向前进的帧进行剥离(去除适当的标签)。换言之，核心网和接入网边缘的交换机能够以上述方式同时处理输入和输出数据。作为示例，对帧进行添加/丢弃标签字段的处理可由在与相应的供应商边缘设备相关联的中央处理单元(CPU)上运行的软件例程来执行。
注意，在图4所示的实施例中，以太网核心网20中的数据分组包含由封装客户MAC地址的n-PE设备添加的SP MAC头部。这种方式的MAC地址的封装被称为MAC隧道定向，它提供了确保客户的MAC地址不被核心网20内的所有交换机得知(即它们保持不可见)的机制。网络领域的专业人员会意识到，图4的实施例在下述应用中很有用，所述应用依赖于被限制为操作12比特标签的核心网20中的设备。核心交换机只看见上部标签，而下部标签(即E-VLAN标签(服务))只被n-PE设备处理。
图5的实施例与图4示出的实施例相似，但核心中没有MAC隧道定向。与以太网核心网不同，图5示出在多协议标记交换(Multi-protocollabel switching，MPLS)/因特网协议(Internet Protocol，IP)核心网50上可以怎样使用本发明的E-VLAN标签。因为核心是MPLS/IP，所以客户的MAC地址在SP核心网中不可见。在该示例中，在入口侧，n-PE设备32操作来将接入网21的12比特VLAN标签的服务实例标识符映射到标识用于跨核心网50的连接的服务实例的20比特E-VLAN标签。在出口侧，n-PE设备33将20比特E-VLAN标签向回映射到标识接入网22的广播域和服务域二者的12比特VLAN。如图所示，核心数据分组还包括用于跨核心网50的IP封装的MPLS上的以太网(Ethernet over MPLS，EoMPLS)头部。
现在转到图6，示出根据本发明另一个实施例的E-VLAN机制的使用。在该实施例中，客户MAC地址的封装和E-VLAN标签的生成发生在接入网中，即，发生在u-PE设备而不是核心网20的n-PE设备处。换言之，E-VLAN标签被再次用作20比特服务实例标识符，但并不是在n-PE设备32和33处执行添加和丢弃E-VLAN标签的操作，相反，那些操作由u-PE设备31和34执行。换言之，在图6的示例中，u-PE设备31在将客户帧转发过接入网21之前，对每个客户帧添加服务实例E-VLAN和广播域VLAN标签。注意，客户帧也封装在u-PE MAC头部的内部。
E-VLAN标签在经过核心网20和接入网22时保持不变。然而，意识到指定接入网21中的广播域的VLAN标签和核心网20中的广播域VLAN标签不同，也和指定接入网22中的广播域的VLAN不同。即，n-PE设备32和33在数据分组中改变的唯一部分是定义广播域的范围的上部VLAN标签。
图7图示根据本发明的另一个实施例的扩展VLAN机制同时被用作广播域标识符和服务实例标识符的情形。在前面的示例中，E-VLAN标签被用来标识服务实例域(即客户)；而在图7的示例中，E-VLAN标签同时指定经过以太网核心网20的广播域和服务实例域。图7的实施例因此与图4示出的实施例相似，但核心的n-PE设备32没有添加额外的VLAN(广播)。
图8图示根据本发明的又一个实施例的扩展VLAN机制同时被用作带有MAC隧道定向的服务实例标识符和广播域标识符的情形。该实施例与图6示出的实施例相似，但与接入网21和22中层叠的VLAN(广播)和E-VLAN(服务)标签不同，图8中广播域和服务实例域标识符都包含在由u-PE设备31(用于从CE设备41到CE设备42的从左向右流过的流量)或u-PE设备34(用于从CE设备42到CE设备41的从右向左流过的流量)添加的单个20比特E-VLAN标签中。
图9的实施例图示根据本发明的又一个实施例的扩展VLAN机制同时被用作带有MAC隧道定向的服务实例标识符和广播域标识符的情形。该实施例除了针对广播域和服务实例标识符使用两个层叠的E-VLAN标签而不是单个E-VLAN标签之外，与图8示出的实施例基本相同。上部E-VLAN指定广播域，下部E-VLAN标识接入域中的服务实例。和前面一样，广播域E-VLAN由n-PE设备改变以定义经过核心网20的设备和路径，而下部E-VLAN(服务)由n-PE设备32和33保持不变。
还应理解，本发明的元素也可设置为计算机程序产品，所述计算机程序产品可包含其上存储有可用于对计算机(例如，处理器或其他电子设备)编制程序从而执行操作序列的指令的机器可读介质。或者，可通过硬件和软件的组合执行操作。机器可读介质可包含(但并不局限于)软磁盘(floppy diskette)、光盘、CD-ROM，以及磁光盘、ROM、RAM、EPROM、EEPROM、磁卡或光卡、传播媒体或适用于存储电子指令的其他类型的媒体/机器可读介质。例如，本发明的元素可作为计算机程序产品下载，其中程序可经由通信链路(例如，调制解调器或网络连接)作为包含在载波或其他传播介质中的数据信号从远程计算机(例如，服务器)传送到请求计算机(例如，客户或客户端)。
此外，虽然已经结合具体实施例描述了本发明，但是大量修改和变更也落入本发明的范围中，因此，说明书和附图应视为说明性的而非限制性的。

Claims (12)

1.一种用于与服务供应商相关联的核心网的面向网络的供应商边缘设备的操作方法，所述方法包括：
从所述服务供应商的接入网接收客户帧，所述客户帧具有第一预定比特长度的第一虚拟局域网VLAN标签，所述第一VLAN标签包括用于跨所述接入网的连接的广播和服务实例标识符；
将所述第一VLAN标签的服务实例标识符映射到具有大于所述第一预定比特长度的第二预定比特长度的第二VLAN标签中；
将所述客户帧封装在供应商地址头部内；
在所述第二VLAN标签上层叠第三VLAN标签，所述第三VLAN标签指定所述核心网的广播域。
2.如权利要求1所述的方法，其中所述核心网包括以太网核心网。
3.如权利要求1所述的方法，其中所述核心网包括多协议标记交换MPLS/因特网协议IP网。
4.如权利要求1所述的方法，其中所述第一预定比特长度为12比特，所述第二预定比特长度为20比特。
5.一种用于与服务供应商相关联的核心网的面向网络的供应商边缘设备的操作方法，所述方法包括：
从所述服务供应商的接入网接收客户帧，所述客户帧具有客户媒体访问控制MAC头部、客户虚拟局域网VLAN标签和第一预定比特长度的第一虚拟局域网VLAN标签，所述第一VLAN标签包括广播标识符和服务实例标识符；
将所述第一VLAN标签的服务实例标识符映射到具有大于所述第一预定比特长度的第二预定比特长度的第二VLAN标签中，所述第二VLAN标签指定经过所述核心网的服务实例域和广播域；以及
将所述客户帧封装在供应商地址头部内。
6.如权利要求5所述的方法，其中所述核心网包括以太网核心网。
7.如权利要求5所述的方法，其中所述接入网包括以太网接入网。
8.如权利要求5所述的方法，其中所述第一预定比特长度为12比特，所述第二预定比特长度为20比特。
9.一种面向网络的供应商边缘设备，包括：
从与服务供应商相关联的接入网接收客户帧的端口，所述客户帧具有第一预定比特长度的第一虚拟局域网VLAN标签，所述第一VLAN标签包括服务实例标识符；以及
处理单元，所述处理单元将所述第一VLAN标签的服务实例标识符映射到具有大于所述第一预定比特长度的第二预定比特长度的第二VLAN标签中，所述处理单元还用来将所述客户帧封装在供应商地址头部内，并且还在所述第二VLAN标签上层叠第三VLAN标签，所述第三VLAN标签指定用于跨所述服务供应商的核心网的连接的广播域。
10.如权利要求9所述的面向网络的供应商边缘设备，其中所述第一预定比特长度为12比特，所述第二预定比特长度为20比特。
11.一种面向网络的供应商边缘设备，包括：
从接入网接收客户帧的端口，所述客户帧具有客户媒体访问控制MAC头部、客户虚拟局域网VLAN标签和第一预定比特长度的第一VLAN标签，所述第一VLAN标签包括用于跨所述接入网的连接的服务实例标识符和广播标识符；以及
处理单元，所述处理单元将所述第一VLAN标签的服务实例标识符和广播标识符映射到具有大于所述第一预定比特长度的第二预定比特长度的第二VLAN标签中，所述第二VLAN标签指定经过服务供应商核心网的服务实例域和广播域，所述处理单元还用来将所述客户帧封装在供应商地址头部内。
12.如权利要求11所述的面向网络的供应商边缘设备，其中所述第一预定比特长度为12比特，所述第二预定比特长度为20比特。
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