WO2011113398A1 - Procédé et noeud pour construire des voies de gestion et de maintenance - Google Patents

Procédé et noeud pour construire des voies de gestion et de maintenance Download PDF

Info

Publication number
WO2011113398A1
WO2011113398A1 PCT/CN2011/073484 CN2011073484W WO2011113398A1 WO 2011113398 A1 WO2011113398 A1 WO 2011113398A1 CN 2011073484 W CN2011073484 W CN 2011073484W WO 2011113398 A1 WO2011113398 A1 WO 2011113398A1
Authority
WO
WIPO (PCT)
Prior art keywords
node
network
broadcast tree
broadcast
information
Prior art date
Application number
PCT/CN2011/073484
Other languages
English (en)
Chinese (zh)
Inventor
张雪江
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201180000420.4A priority Critical patent/CN102171974B/zh
Priority to PCT/CN2011/073484 priority patent/WO2011113398A1/fr
Publication of WO2011113398A1 publication Critical patent/WO2011113398A1/fr

Links

Images

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]
    • H04L12/46—Interconnection of networks
    • H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
    • H04L12/462—LAN interconnection over a bridge based backbone
    • 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
    • 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
    • H04L45/02—Topology update or discovery
    • H04L45/03—Topology update or discovery by updating link state protocols
    • 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

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and a node for constructing a maintenance and maintenance channel.
  • the process implemented in the prior art is: First, the NNI at each node (network node interface, Network Manually configure mVLAN on the side port of the Node Interface (virtual management area network, management virtual Local Area) Then, on the edge Layer 3 device, configure the mVLAN as the gateway interface of all Layer 2 network devices and configure interface routing. All nodes in the Layer 2 network are manually configured with MSTP (Multiple). Spanning Tree Protocol, multiple spanning tree protocol, based on the protocol, the loop existing in the mVLAN broadcast domain is destroyed.
  • MSTP Multiple
  • a channel between the edge Layer 3 device and the Layer 2 device is established from the edge node to each node.
  • the channel is used to transmit between the network management system of the background or other service systems (including a dynamic host configuration protocol server that allocates addresses for the Layer 2 device or a file transmission server that provides version downloading for the device) and each Layer 2 network device. Network management or other service packets.
  • the embodiment of the present invention provides a method for constructing a maintenance and maintenance channel and a node.
  • the node in the network can automatically determine the broadcast tree and propagate the maintenance and maintenance message through the broadcast tree.
  • An embodiment of the present invention provides a method for constructing a management and maintenance channel, including:
  • the extended specific protocol is used to obtain topology information in the network, where the topology information includes: a node state in the network, a link state between nodes, management virtual network mVLAN information, and edge node information;
  • a broadcast tree Determining, by the predetermined algorithm, a broadcast tree to the edge node according to the node state, the inter-node link state, and the edge node information in the acquired network, and dynamically configuring a port of the broadcast tree according to the mVLAN information, the broadcast
  • the tree is used to propagate management and maintenance messages.
  • the embodiment of the invention provides a node, including:
  • An acquiring module configured to acquire topology information in the network by running the extended specific protocol, where the topology information includes: a node state of each node in the network, a link state between nodes, management virtual network mVLAN information, and edge node information;
  • a broadcast tree determining module configured to determine, according to a node state, an inter-node link state, and an edge node information in a network acquired by the acquiring module, a broadcast tree to an edge node by using a predetermined algorithm, and dynamically configuring the device according to the mVLAN information
  • each node in the network acquires topology information in the network by running a specific protocol extended, and determines a broadcast tree in the network according to the predetermined algorithm according to the topology information, without manual Configure to enable each node in the network of any topology to automatically build management and maintenance channels.
  • FIG. 1 is a flowchart of a method for constructing a management maintenance channel according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of an extended format of a TLV message according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a layer 2 network formed by 10 nodes according to an embodiment of the present disclosure
  • FIG. 4 is a schematic structural diagram of a Layer 2 network formed by 11 nodes according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a node according to an embodiment of the present invention.
  • An embodiment of the present invention provides a method for constructing a management and maintenance channel, as shown in FIG. 1 , including:
  • the nodes in the network obtain the topology information in the network by running the extended specific protocol, where the topology information in the network includes but is not limited to the node status of each node in the network, the link state between nodes, and the management virtual network mVLAN information and Edge node information.
  • the specific protocol may be the 802.1aq protocol
  • the 802.1aq protocol is the ITU (International Telecommunications Union, the International Telecommunications Union, a standard protocol, because the node status and inter-node link status of each node in the network can be learned by running the existing 802.1aq protocol, so the extension of 802.1aq only needs to include mVLAN information and
  • the edge node information may be, wherein the node state may indicate that each node is in a working or closed state, and the inter-node link state may indicate that the link between the nodes is in a normal or fault state.
  • the extension of the 802.1aq can be extended to the TLV packet in the protocol.
  • the extended format can be as shown in Figure 2, where "Type” is used to identify the topology information of the packet used in the transmission network; "Length” is used to Identifies the length of the packet; "mVLAN” Used to mark the mVLAN information reserved by the network.
  • the mVLAN information can be used to identify the mVLAN; ID is used to identify the information of the edge node, which can be the MAC address of the edge node.
  • the nodes in the network can extend the entire network of the topology information by running the extended 802.1aq protocol, so that all nodes on the entire network can perceive the network.
  • the edge node in the mVLAN is a network reserved for the edge node and configured on the edge node to carry packets for communication with the service system and for managing network devices in the maintenance network.
  • Each node in the network determines a broadcast tree of the edge node to each node in the network according to a node state, an inter-node link state, and an edge node information in the acquired network, and dynamically configures the broadcast according to the mVLAN information.
  • the foregoing broadcast tree is automatically saved in each node after determining, and the predetermined algorithm may include, but is not limited to, a shortest path first SPF algorithm, and the node automatically adopts an SPF algorithm based on the edge node information according to the node status of each node and the interlink relationship between the nodes.
  • the broadcast tree with the edge node as the root and the other nodes as the leaf nodes is constructed. Take the two-layer network composed of 10 nodes as shown in FIG. 3 as an example, and the dotted line indicates the broadcast path of the automatically constructed broadcast tree.
  • the broadcast tree automatically constructed is only used when the service system such as the background network management manages and maintains the network device, no communication is required between the nodes, so in order to prevent a node from transmitting ARP (Address Resolution Protocol), DHCP (Dynamic Host Configuration) Protocols, dynamic host setting protocol, etc. are broadcasted to other nodes in a meaningless manner, and the load of the control planes of other nodes is increased. Therefore, port isolation of each outgoing port of the broadcast tree is performed on the mVLAN. To prevent the packets from being forwarded on the mVLANs in the outbound port of the broadcast tree, you can maintain the outbound port list of the broadcast tree first, and then set all the outbound ports in the outbound port list to port isolation.
  • ARP Address Resolution Protocol
  • DHCP Dynamic Host Configuration Protocol
  • dynamic host setting protocol etc.
  • the settings can be done by each node or by a switch in the network.
  • the port isolation setting allows packets to be forwarded only between the ingress port and the egress port of the broadcast tree. In this way, each node can send and receive management and maintenance packets only between the service system and the back-end network. The nodes do not send and receive packets to each other, ensuring the security and reliability of the network device.
  • a two-layer network composed of 10 nodes as shown in FIG. 3 is taken as an example, wherein Ifi-j represents a port between node i and node j, and i and j are both positive integers, and the ingress port of node 2
  • Ifi-j represents a port between node i and node j
  • i and j are both positive integers
  • the ingress port of node 2 For example, if2-1, the outbound ports If2-3 and If2-5, the ports If2-3 and If2-5 are set to port isolation, so that packets can only be forwarded between If2-3 and If2-1, or Messages can only be forwarded between If2-5 and If2-1.
  • the node adjacent to the faulty node broadcasts fault information
  • the nodes other than the faulty node in the broadcast tree pass the predetermined fault information according to the fault information and the topology information in the network.
  • the algorithm re-determines the broadcast tree of the edge node to each node in the network and updates the stored broadcast tree; for example, as shown in FIG. 3, if node 7 fails, node 1 and/or node 8 adjacent to node 7 broadcast node 7
  • nodes 1, 2, 3, 4, 5, 6, 8, 9, and 10 in the broadcast tree re-determine the broadcast tree of the edge node 1 to each node in the network through the SPF algorithm, and update the original stored node according to the node.
  • 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 use the SPF algorithm to determine the broadcast tree between the edge node 1 and each node, and manage the maintenance message transmission through the updated broadcast tree. .
  • the method further includes: when a link fault occurs between the node and the node in the network, the node connected by the fault link broadcasts the fault information, and each node in the broadcast tree passes the fault information and the topology information in the network.
  • the predetermined algorithm re-determines the broadcast tree of the edge node to each node and updates the stored broadcast tree. For example, as shown in FIG. 3, if a link failure occurs between the node 7 and the node 8, the node 7 and/or the node 8 broadcast the link failure information between the node 7 and the node 8, and the nodes 1 and 2 in the broadcast tree are broadcasted. 3, 4, 5, 6, 7, 8, 9, and 10 re-determine the broadcast tree of the edge node 1 to the node through the SPF algorithm, update the originally stored broadcast tree, and manage and maintain the report through the updated broadcast tree. The spread of the text.
  • the method may further include: when a node is added to the broadcast tree, first, the node in the broadcast tree notifies the newly added node of the stored broadcast tree by running the extended specific protocol; secondly, the node in the broadcast tree And the newly added node determines the path of the newly added node to the edge node by using a predetermined algorithm based on the broadcast tree, and finally adds the path of the newly added node to the edge node to the broadcast tree and stores. For example, as shown in FIG.
  • node 9 and/or node 10 advertise its stored broadcast tree to node 11 by running the extended 802.1aq protocol, nodes 1 to 10 in the broadcast tree, and The newly added node 11 determines the path of the node 11 to the node 1 by the SPF algorithm based on the determined broadcast tree (as shown by the dotted line in FIG. 3) (ie, node 1 - node 7 - node 8 - node 9 - node 11), broadcast tree
  • the nodes 1 to 10 and the new node 11 in the node 11 add the path of the node 11 to the node 1 to the determined broadcast tree and store it, and the broken line in Fig. 4 indicates the broadcast path of the new broadcast tree.
  • the network in the embodiment of the present invention may be a network of any topology, and may be a Layer 2 network in an Ethernet or the like.
  • An embodiment of the present invention further provides a node, as shown in FIG. 5, including:
  • the obtaining module 51 is configured to obtain topology information in the network by running the extended specific protocol, where the topology information in the network includes: node status of each node in the network, link status between nodes, management virtual network mVLAN information, and edge node information.
  • the specific protocol in the obtaining module 51 may be an 802.1aq protocol, and the 802.1aq protocol is an ITU (International). Telecommunications Union, the International Telecommunications Union, a standard protocol, because the node status and inter-node link status of each node in the network can be learned by running the existing 802.1aq protocol, so the extension of 802.1aq only needs to include mVLAN information and
  • the edge node information may be, wherein the node state may indicate that each node is in a working or closed state, and the inter-node link state may indicate that the link between the nodes is in a normal or fault state.
  • the extension of the 802.1aq can be extended to the TLV packet in the protocol.
  • the extended format can be as shown in Figure 2, where "Type” is used to identify the topology information of the packet used in the transmission network; "Length” is used to Identifies the length of the packet; mVLAN is used to mark the mVLAN information reserved by the network.
  • the mVLAN information can be used to identify the mVLAN; ID is used to identify the information of the edge node, which can be the MAC address of the edge node.
  • the nodes in the network can extend the entire network of the topology information by running the extended 802.1aq protocol, so that all nodes on the entire network can perceive the network.
  • the edge node in .
  • the broadcast tree determining module 52 is configured to determine, according to a node state, an inter-node link state, and an edge node information in the network acquired by the acquiring module 51, a broadcast node of the edge node to each node by using a predetermined algorithm, according to the mVLAN information.
  • the port of the broadcast tree is dynamically configured, and the broadcast tree is used to propagate management maintenance messages.
  • the predetermined algorithm may include, but is not limited to, a shortest path first SPF algorithm, and the above broadcast tree is automatically saved in each node after being determined.
  • the edge node may further include a reservation configuration module, configured to reserve an mVLAN to the edge node and configured on the edge node, where the mVLAN is used to carry a message for communication with a service system and is used for management. Maintain network devices in your network.
  • a reservation configuration module configured to reserve an mVLAN to the edge node and configured on the edge node, where the mVLAN is used to carry a message for communication with a service system and is used for management. Maintain network devices in your network.
  • the port isolation module may be further configured to perform port isolation on the mVLANs of the outbound ports of the broadcast tree to prevent the packets from being forwarded on the mVLANs in the outbound ports of the broadcast tree.
  • the above node may further include: a fault broadcast module, configured to broadcast fault information.
  • the broadcast tree determining module 52 is further configured to determine, by the predetermined algorithm, the broadcast tree of the edge node to each node according to the fault information broadcasted in the fault broadcast module and the topology information in the network.
  • an update module configured to update the stored broadcast tree to the broadcast tree of the edge node re-determined by the broadcast tree determining module 52 to each node.
  • the node adjacent to the faulty node executes the fault broadcast module
  • the nodes other than the faulty node in the broadcast tree execute the broadcast tree determining module 52 and the update module; or,
  • the node connected by the faulty link executes the fault broadcast module, and each node in the broadcast tree executes a broadcast tree determination module 52 and an update module.
  • the foregoing node may further include: an advertising module, configured to notify the newly added node of the stored broadcast tree by running the extended specific protocol when a node is added to the broadcast tree.
  • the broadcast tree determining module 52 is further configured to determine, by using a predetermined algorithm, the path of the newly added node to the edge node based on the stored broadcast tree.
  • the module is updated at this time, and is also used to add the path of the newly added node to the edge node to the stored broadcast tree.
  • the network in the embodiment of the present invention may be a network of any topology, and may be a Layer 2 network in an Ethernet or the like.
  • each module included is only divided according to functional logic, but is not limited to the above division, as long as the corresponding function can be implemented; in addition, the specific name of each functional module It is also for convenience of distinguishing from each other and is not intended to limit the scope of protection of the present invention.
  • the storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • an MVLAN can be reserved and configured on the network edge node to implement automatic configuration of the management and maintenance channel, and no other manual configuration is required.
  • the specific topology information can be spread by extending the 802.1aq protocol.
  • the edge node declares the attribute of the node as an edge node, and regards the mVLAN as a subsidiary topology information attached to the edge node.
  • the two information and the network topology information are spread together. All the nodes of the entire network, each node calculates a broadcast tree from the edge node to all the nodes based on the network topology information, and dynamically configures the ports of the broadcast tree according to the mVLAN.
  • each node in the network can automatically build a management and maintenance channel to the network edge node (corresponding to the business system such as the background network management).
  • the mVLAN for management and maintenance can be dynamically configured to the corresponding port through the extended 802.1aq protocol, and is calculated based on the topology information of the current network, and the edge node is the root of the other node as the leaf node of the broadcast tree. Dynamically configured to the ingress port and egress port of the broadcast tree. Because the broadcast tree can be changed with the network topology information, and the mVLAN is configured on the edge node, you need to replace other VLANs as the mVLAN for managing the maintenance channel.
  • mVLAN is a dynamic VLAN, and can be dynamically and automatically configured to the corresponding port.
  • the port isolation of the egress port of the broadcast tree on the mVLAN allows the management and maintenance packets to be forwarded only between the ingress port and the egress port of the broadcast tree, so that each node can only be in the background.
  • the service and maintenance messages are sent and received between the network and other service systems.
  • the nodes do not send and receive packets to each other. Therefore, the management and maintenance related packets are broadcast and replicated between devices, ensuring the safe and reliable operation of network devices.

Landscapes

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

Abstract

Dans le domaine de la technologie de communication, l'invention concerne un procédé et un noeud pour construire des voies de gestion et de maintenance. Dans les modes de réalisation de la présente invention : tout d'abord, chaque noeud dans un réseau obtient les informations de topologie du réseau par application d'un protocole désigné étendu; ensuite selon les informations de topologie du réseau obtenues, chaque noeud dans le réseau détermine l'arborescence de diffusion à partir de noeuds périphériques jusqu'à chaque noeud par l'intermédiaire d'un algorithme prédéterminé et configure les ports de l'arborescence de diffusion de manière dynamique, l'arborescence de diffusion servant à transmettre des messages de gestion et de maintenance. Les modes de réalisation de la présente invention permettent, pour un réseau bicouche de n'importe quel type de topologie, que chaque noeud présent dans le réseau puisse construire des voies de gestion et de maintenance automatiquement sans configuration manuelle de sorte que les fonctions du type "prêt-à-tourner" de dispositifs soient assurées. En outre, les modes de réalisation de la présente invention permettent d'assurer une isolation des ports au niveau de chaque port de sortie de l'arborescence de diffusion dans un réseau local virtuel de gestion (mVLAN) de façon que les messages de gestion et de maintenance ne soient transmis qu'entre les ports de sortie et les ports d'entrée de l'arborescence de diffusion, ce qui permet d'assurer la sécurité et la fiabilité du fonctionnement des dispositifs réseau.
PCT/CN2011/073484 2011-04-28 2011-04-28 Procédé et noeud pour construire des voies de gestion et de maintenance WO2011113398A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201180000420.4A CN102171974B (zh) 2011-04-28 2011-04-28 一种管理维护通道的构建方法及节点
PCT/CN2011/073484 WO2011113398A1 (fr) 2011-04-28 2011-04-28 Procédé et noeud pour construire des voies de gestion et de maintenance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2011/073484 WO2011113398A1 (fr) 2011-04-28 2011-04-28 Procédé et noeud pour construire des voies de gestion et de maintenance

Publications (1)

Publication Number Publication Date
WO2011113398A1 true WO2011113398A1 (fr) 2011-09-22

Family

ID=44491709

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2011/073484 WO2011113398A1 (fr) 2011-04-28 2011-04-28 Procédé et noeud pour construire des voies de gestion et de maintenance

Country Status (2)

Country Link
CN (1) CN102171974B (fr)
WO (1) WO2011113398A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104469845B (zh) * 2013-09-18 2019-05-10 华为技术有限公司 一种报文处理方法、系统及设备
CN105656746A (zh) * 2014-12-03 2016-06-08 中兴通讯股份有限公司 一种管理信息的传送方法和系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101171802A (zh) * 2005-03-04 2008-04-30 日本电气株式会社 节点，网络，对应关系产生方法和帧传送程序
US20090059800A1 (en) * 2007-08-30 2009-03-05 Nortel Networks Limited Method and apparatus for managing the interconnection between network domains
CN101667956A (zh) * 2008-09-05 2010-03-10 华为技术有限公司 一种pbb-te路径管理的方法及装置与系统
WO2010118964A1 (fr) * 2009-04-16 2010-10-21 Alcatel Lucent Procédé de transmission de données de clients par l'intermédiaire d'un réseau de fournisseurs à commutation de paquets

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101171802A (zh) * 2005-03-04 2008-04-30 日本电气株式会社 节点，网络，对应关系产生方法和帧传送程序
US20090059800A1 (en) * 2007-08-30 2009-03-05 Nortel Networks Limited Method and apparatus for managing the interconnection between network domains
CN101667956A (zh) * 2008-09-05 2010-03-10 华为技术有限公司 一种pbb-te路径管理的方法及装置与系统
WO2010118964A1 (fr) * 2009-04-16 2010-10-21 Alcatel Lucent Procédé de transmission de données de clients par l'intermédiaire d'un réseau de fournisseurs à commutation de paquets

Also Published As

Publication number Publication date
CN102171974A (zh) 2011-08-31
CN102171974B (zh) 2013-04-24

Similar Documents

Publication Publication Date Title
CN106936777B (zh) 基于OpenFlow的云计算分布式网络实现方法、系统
EP3691185B1 (fr) Procédé de traitement de message, dispositif et système
US7733812B2 (en) Method for enabling multipoint network services over a ring topology network
US9197583B2 (en) Signaling of attachment circuit status and automatic discovery of inter-chassis communication peers
US8837281B2 (en) Use of partitions to reduce flooding and filtering database size requirements in large layer two networks
CN108092893B (zh) 一种专线开通方法及装置
KR102342286B1 (ko) Dcn 메시지 처리 방법, 네트워크 디바이스, 및 네트워크 시스템
US20090074413A1 (en) System and method for providing transparent lan services
CN106452909B (zh) 一种路由发布方法以及路由反射器设备
US10560456B2 (en) Method, apparatus, and system for collecting access control list
JP2009212875A (ja) 通信装置及びそれに用いる運用管理方法
WO2011144048A2 (fr) Procédé de réalisation de multidiffusion et dispositif réseau
CN105490937A (zh) 以太虚拟网络网关切换方法和服务商边缘节点设备
WO2019157476A1 (fr) Liaison de connexions ip de couche 3 osi à couche de 2 osi pour réseaux maillés
WO2011113398A1 (fr) Procédé et noeud pour construire des voies de gestion et de maintenance
JP2015012455A (ja) 伝送装置および伝送方法
Gumaste et al. On the architectural considerations of the FISSION (Flexible Interconnection of Scalable Systems Integrated using Optical Networks) framework for data-centers
US20030208525A1 (en) System and method for providing transparent lan services
JP2023543199A (ja) ルーティング情報伝送方法および装置
JP5853758B2 (ja) 通信装置及び帯域制御方法
WO2023143186A1 (fr) Procédé, système et appareil de transmission de données
JP2004032633A (ja) 伝送ネットワーク監視システムおよび伝送ネットワークの監視方法
Kasu et al. Spanning Tree Protocol
James Applying ADM and OpenFlow to Build High Availability Networks
WO2005018145A1 (fr) Systeme et procede de fourniture de services de reseau lan transparents

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 201180000420.4

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11755715

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11755715

Country of ref document: EP

Kind code of ref document: A1