WO2008128449A1 - Procédé, système et dispositif d'accès permettant la mise en oeuvre d'une intercommunication à deux couches de service spécial - Google Patents

Procédé, système et dispositif d'accès permettant la mise en oeuvre d'une intercommunication à deux couches de service spécial Download PDF

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Publication number
WO2008128449A1
WO2008128449A1 PCT/CN2008/070333 CN2008070333W WO2008128449A1 WO 2008128449 A1 WO2008128449 A1 WO 2008128449A1 CN 2008070333 W CN2008070333 W CN 2008070333W WO 2008128449 A1 WO2008128449 A1 WO 2008128449A1
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WO
WIPO (PCT)
Prior art keywords
packet
destination
mac address
specific service
feature information
Prior art date
Application number
PCT/CN2008/070333
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English (en)
Chinese (zh)
Inventor
Feng Li
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008128449A1 publication Critical patent/WO2008128449A1/fr

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Classifications

    • 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]
    • H04L12/2854—Wide area networks, e.g. public data networks
    • H04L12/2856—Access arrangements, e.g. Internet access
    • 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

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, system, and access device for implementing Layer 2 interworking of a specific service.
  • the existing access network architecture consists of three parts: NAS (Network Access Server), aggregation layer, and access layer.
  • the NAS is the boundary between the access network and the IP network. All the traffic between the users needs to be forwarded by the NAS.
  • the aggregation layer is composed of multiple aggregation points, which is used to implement Layer 2 aggregation of the user physical or logical access channel to the NAS.
  • the access layer is composed of an AN (Access Node), and the AN is responsible for receiving the data link layer and the physical layer of the user, and performing simple Layer 2 access control.
  • the AN is mainly a DSLAM (Digital Subscriber Line). Access Mutliplexer, Digital Subscriber Line Access Multiplexer) or Ethernet Layer 2 Switch. Referring to FIG.
  • FIG. 1 is a schematic diagram of a broadband access network provided by the prior art.
  • User A and user B are connected to the same NAS.
  • the aggregation point 2 sends the data to the NAS.
  • the NAS forwards the data to the user B through the convergence point 2, the convergence point 3, and the access node AN2.
  • P2P Peer-to-Peer
  • the embodiment of the present invention provides a method, a system, and an access device for implementing Layer 2 interworking of a specific service.
  • the technical solution is as follows:
  • a method for implementing Layer 2 interworking of a specific service includes:
  • the source access node After receiving the packet, the source access node determines whether the packet is a specific service packet, and if yes, sends the packet to the destination access node by using the Layer 2 channel;
  • the destination access node After receiving the packet, the destination access node sends the packet to the destination device.
  • the embodiment of the present invention further provides a system for implementing Layer 2 interworking of a specific service, where the system includes: a network access server, a source access device, and a destination access device;
  • the network access server is configured to notify the source access device to record feature information of a specific service packet; the source access device and the destination access device have a Layer 2 channel;
  • the source access device is configured to receive a packet, and extract feature information of the packet, and determine whether the feature information of the packet is the same as the feature information of the specific service packet.
  • the message is sent to the destination access device by using the Layer 2 channel;
  • the destination access device is configured to receive the packet sent by the source access device, and send the packet to the destination device.
  • An embodiment of the present invention further provides an access device, where the device includes:
  • a receiving module configured to receive a message
  • a determining module configured to determine whether the packet received by the receiving module is a specific service packet
  • a sending module configured to: when the determining result of the determining module is that the packet is a specific service packet, forwarding the packet by using the Layer 2 channel; otherwise, forwarding the packet by using a network access server.
  • a Layer 2 channel is established between two specific access nodes, and a Layer 2 channel is used to forward a specific service packet, and the specific service packet is not required to be forwarded to the NAS, thereby reducing the load of the NAS. .
  • the source device does not need to know the MAC address of the destination device, which ensures the security of the access network.
  • FIG. 1 is a schematic diagram of a broadband access network provided by the prior art
  • FIG. 2 is a schematic diagram of an access network topology according to Embodiment 1 of the present invention.
  • FIG. 3 is a flowchart of a method for implementing Layer 2 interworking of a specific service according to Embodiment 1 of the present invention
  • FIG. 4 is a structural diagram of a system for implementing Layer 2 interworking of a specific service according to Embodiment 2 of the present invention
  • FIG. 5 is a structural diagram of an access device according to Embodiment 3 of the present invention. detailed description
  • a dedicated Layer 2 channel is created for a specific service packet, so that the packets do not pass through the NAS during forwarding, thereby reducing the burden on the NAS and ensuring the security of the access network.
  • Embodiment 2 is a schematic diagram of an access network topology according to Embodiment 1 of the present invention.
  • the figure includes: two user equipments (User 1 and User 2), an access node AN1, and an access node AN2, an aggregation layer, and network access.
  • Server NAS User 1 and user 2 are connected to the same NAS through access nodes AN1 and AN2 connected to the aggregation layer.
  • the specific service packets transmitted between the user 1 and the user 2 are specific service packets, for example, IPTV (Internet Protocol Television) service packets, FTP (File Transfer Protocol) service packets, and SMTP. (Simple Mai l Transfer Protocol) Service messages, etc.
  • the NAS selects the access node AN1 corresponding to the user 1 and the access node AN2 corresponding to the user 2, and creates a Layer 2 channel between the access nodes AN1 and AN2; and adds a distinction on the access node AN1.
  • the ability of a specific service message for example: ACL (Access Control List) function.
  • ACL Access Control List
  • FIG. 3 is a flowchart of a method for implementing Layer 2 interworking of a specific service according to Embodiment 1 of the present invention.
  • This embodiment provides a method for implementing Layer 2 interworking of a specific service.
  • the access network provided in FIG. The example is explained.
  • User 1 and user 2 serve as source and destination devices respectively, and AN1 and AN2 serve as source access nodes and destination access nodes, respectively.
  • the method includes:
  • the NAS initiates Layer 2 interworking and records the feature information of the specific service packet, the MAC address of the user 1 corresponding to the specific service packet, and the MAC address of the user 2, and the MAC addresses of the AN1 and AN2.
  • the feature information may be quintuple information, including the IP address of the user 1, the IP address of the user 2, the transport layer port number of the user 1, the transport layer port number of the user 2, and the transport layer type; the feature information may also be a six-tuple
  • the information includes the IP address of user 1, the IP address of user 2, the transport layer port number of user 1, the transport layer port number of user 2, the transport layer type, the service type field, or the feature information is simplified to the transport layer port of user 1.
  • the feature information is simplified to the transport layer port number of the user 2; or the feature information is simplified to the service type field; or the transport layer port number of the user 1 and the transport layer port number of the user 2; or the transport layer port of the user 1 No., user 2's transport layer port number and service type field.
  • the specific service in this embodiment is an IPTV service packet
  • the feature information of the IPTV service packet is quintuple information, that is, the IP address of the user 1 and the IP address of the user 2 carried in the IPTV packet.
  • the NAS can initiate Layer 2 interworking between specific services between User 1 and User 2 in a manner that is notified by other external service devices or in a self-aware manner.
  • Other external service devices herein may be policy control servers or devices with policy control capabilities.
  • the NAS notifies AN1 and AN2 to create and store a feature information table, and stores the recorded feature information in the feature information table, where the created feature information table can be used to match a specific service message between user 1 and user 2,
  • the packet matching the feature information is forwarded to the corresponding AN through the Layer 2 channel.
  • the specific form of the feature information table in this embodiment is an ACL table, and the ACL function is added to the AN1.
  • the quintuple information of the packet is the same as the quintuple information of the IPTV service packet, indicating that the packet is an IPTV service packet.
  • the packet is not forwarded by the NAS. If no matching entry is found in the ACL, the quintuple information of the packet is different from the quintuple information of the IPTV service packet, indicating that the packet is not an IPTV packet.
  • the service packet is forwarded by the NAS according to the forwarding mode of the prior art.
  • the two-layer channel is enabled by using the ACL function to create a Layer 2 channel through the service-specific packets.
  • the correspondence between the MAC address and the IP address of the user 1 is recorded on the AN1, and the correspondence between the MAC address and the IP address of the user 2 is recorded on the AN2;
  • AN1 learns the MAC address of AN2 and the learning of AN2. After the MAC address of AN1 is completed, AN1 and AN2 enable the packet distinguishing function. That is, the ACL function is used to distinguish IPTV service packets.
  • the AN1 After receiving the packet, the AN1 extracts the feature information of the packet, and determines whether the extracted feature information is the same as the feature information of the specific service packet, that is, whether the ACL searches for a table matching the feature information of the packet. If it is the same, execute 205; otherwise, execute 208.
  • the quintuple information of the packet is specifically extracted, and it is determined whether the extracted quintuple information is the same as the quintuple information of the IPTV service packet, that is, whether the ACL is found with the packet.
  • the quintuple information exactly matches the entry.
  • the AN1 changes the destination MAC address of the packet to the MAC address of the AN2, and the source MAC address is changed to the MAC address of the AN1, and the packet is forwarded to the AN2 through the VLAN.
  • the AN2 determines whether the packet is a specific service packet.
  • the AN2 can determine whether the packet is based on the characteristic information of the NAS notification, and whether the destination MAC address of the packet is the MAC address of the AN2. If it is the MAC address of the AN2, the packet is a specific service packet, otherwise it is not a specific service packet, and is an ordinary packet; if the packet is a specific service packet, the execution is 207; otherwise, the execution is 208.
  • the MAC address corresponding to the destination IP address of the packet is searched, and the MAC address found in this embodiment is user 2
  • the original destination MAC address in the packet is changed to the MAC address of user 2
  • the source MAC address is changed to the MAC address of the NAS, and the packet is sent to user 2.
  • a Layer 2 channel is established between two specific access nodes, and a Layer 2 channel is used to forward a specific service packet.
  • a Layer 2 channel is used to forward a specific service packet.
  • the source device does not need to know the MAC address of the destination device, which ensures the security of the access network.
  • FIG. 4 is a structural diagram of a system for implementing Layer 2 interworking of a specific service according to Embodiment 2 of the present invention.
  • This embodiment provides a system for implementing Layer 2 interworking of a specific service, where the system includes: a network access server, The source access device and the destination access device; the specific service in this embodiment may be an IPTV, FTP, or SMTP service packet.
  • the network access server is configured to notify the source access device to record the feature information of the specific service packet.
  • the source access device and the destination access device may be in the same virtual local area network or may not be in the same virtual local area network, and the source access device and the destination access device have a second layer channel;
  • the source access device is configured to receive the packet, and extract the feature information of the packet, and determine whether the extracted feature information is the same as the feature information of the specific service packet. If the information is the same, the packet is sent to the Layer 2 channel.
  • the destination access device is configured to receive the packet sent by the source access device and send the packet to the destination device.
  • the network access server is further configured to notify the destination access device to record the feature information of the specific service packet; correspondingly, the destination access device includes:
  • a determining module configured to receive a packet sent by the source access device, and determine, according to the feature information of the notification record of the network access server, whether the packet is a specific service packet;
  • the sending module is configured to: when the determining module determines that the packet is a specific service packet, find a MAC address corresponding to the IP address of the packet, and use the found MAC address as the MAC address of the destination device, and modify the packet.
  • the destination MAC address is the MAC address of the destination device.
  • the source MAC address is the MAC address of the network access server. The packet after the MAC address is modified is sent to the destination device.
  • the source access device includes:
  • the specific service packet determining module is configured to receive the packet, and extract the feature information of the packet, and determine whether the feature information of the packet is the same as the feature information of the specific service packet;
  • the packet processing module is configured to: when the judgment result of the specific service packet determining module is that the packet is a specific service packet, modify the destination MAC address in the packet as the MAC address of the destination access node, and the source MAC address is the source interface.
  • the MAC address of the ingress node; the packet is sent to the destination access device through the Layer 2 channel.
  • the destination access device includes:
  • a determining module configured to receive a packet sent by the source access device, and determine, according to the destination MAC address of the packet, whether the packet is a specific service packet;
  • the sending module is configured to: when the determining module determines that the packet is a specific service packet, the destination IP address of the search packet corresponds to MAC address, the MAC address to be looked up as the MAC address of the destination device, the destination MAC address of the modified packet is the MAC address of the destination device, and the source MAC address is the MAC address of the network access server, which will be modified after the MAC address.
  • the packet is sent to the destination device.
  • the source access device pre-stores the feature information of the specific service packet as the basis for determining whether the received packet is forwarded through the Layer 2 channel.
  • a Layer 2 channel is established between two specific access nodes, and a Layer 2 channel is used to forward a specific service packet, and the specific service packet is not required to be forwarded to the NAS, thereby reducing the load on the NAS.
  • the source device does not need to know the MAC address of the destination device, which ensures the security of the access network.
  • FIG. 5 is a structural diagram of an access device according to Embodiment 3 of the present invention.
  • This embodiment provides an access device, where the device includes:
  • a receiving module configured to receive a message
  • a determining module configured to determine whether the received packet in the receiving module is a specific service packet
  • the sending module is configured to forward the packet through the Layer 2 channel when the judgment result of the determining module is that the packet is a specific service packet, otherwise, the packet is forwarded by the network access server.
  • the determining module determines whether the packet received by the receiving module is a specific service packet by determining whether the feature information of the packet is the same as the feature information of the specific service packet, if the feature information of the packet and the feature of the specific service packet If the information is the same, the packet is a specific service packet.
  • the service packet distinguishing function is used to forward the specific service packet through the Layer 2 channel, thereby reducing the burden on the NAS. Meanwhile, the source device and the destination device do not know the MAC address of the other party. The security of the access network is guaranteed.
  • the technical solution provided by the above embodiments can be implemented by hardware and software, and the software is stored on a readable storage medium, such as a floppy disk, a hard disk or an optical disk of a computer.
  • a method for implementing Layer 2 interworking of a specific service includes:
  • the source access node After receiving the packet, the source access node determines whether the packet is a specific service packet, and if yes, sends the packet to the destination access node by using the Layer 2 channel;
  • the destination access node After receiving the packet, the destination access node sends the packet to the destination device.
  • the source access node After receiving the packet, the source access node extracts feature information of the packet;
  • the transport layer source port number, the transport layer destination port number, and the transport layer type are or, the transport layer source port number, the transport layer destination port number, and the transport layer type;
  • source IP address, destination IP address, transport layer source port number, transport layer destination port number, and transport layer type or, source IP address, destination IP address, transport layer source port number, transport layer destination port number, transport layer Type and business type domain.
  • the method for implementing the service-specific Layer 2 interworking according to claim 2, wherein the determining whether the feature information of the packet is the same as the feature information of the specific service packet includes:
  • the feature information table of the source access node Querying, in the feature information table of the source access node, an entry that matches the feature information of the packet. If the identifier is found, the feature information of the packet is the same as the feature information of the specific service packet. Otherwise, , Not the same.
  • the method for implementing Layer 2 interworking of a specific service according to claim 4, wherein the feature information table is an access control table.
  • the method for implementing a specific service layer 2 interworking according to claim 1, wherein the creating a layer 2 channel between the source access node and the destination access node includes:

Abstract

L'invention concerne un procédé, un système est un dispositif d'accès permettant la mise en oeuvre d'une intercommunication à deux couches de service spécial, qui appartiennent au domaine technique de la communication. Ce procédé comprend les étapes suivantes : sélection d'un noeud d'accès source et d'un noeud d'accès cible de service spécial, ajout d'une capacité de discriminer un message de service spécial au noeud d'accès source, après réception du message par ce noeud d'accès source, évaluation permettant de savoir si le message est un service spécial, et si c'est le cas, envoi de ce message au noeud d'accès cible via un canal à deux couches, après réception du message par le noeud d'accès cible, envoie de ce message à un dispositif cible. Le système comprend un serveur d'accès de réseau, un dispositif d'accès source et un dispositif d'accès cible. Le dispositif d'accès comprend un module de réception, un module d'évaluation et un module d'envoi. Cette invention peut réduire la charge de NAS, et assurer en même temps la sécurité du réseau d'accès.
PCT/CN2008/070333 2007-04-20 2008-02-20 Procédé, système et dispositif d'accès permettant la mise en oeuvre d'une intercommunication à deux couches de service spécial WO2008128449A1 (fr)

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CN200710098565.8 2007-04-20
CNB2007100985658A CN100550857C (zh) 2007-04-20 2007-04-20 实现本地特定业务二层互通的方法、系统和接入设备

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JP5159421B2 (ja) * 2008-05-14 2013-03-06 株式会社日立製作所 ストレージシステム及び管理装置を用いたストレージシステムの管理方法
CN101631135A (zh) * 2008-07-15 2010-01-20 华为技术有限公司 一种数据流二层互通的方法和装置
CN102447669A (zh) * 2010-09-30 2012-05-09 迈普通信技术股份有限公司 多媒体数据流的转发方法及转发设备
CN102957755B (zh) * 2011-08-22 2018-06-19 中兴通讯股份有限公司 一种地址解析方法、装置及信息传输方法
CN108712520B (zh) * 2018-05-31 2021-03-23 安科讯(福建)科技有限公司 一种基于lte无线专网的终端ip地址透传系统及方法

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