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Virtual LAN system and node device

A node and source node technology, applied in the field of virtual LAN system, can solve the problems of impossible use of virtual LAN, scalability, and difficulty in small-scale startup

Inactive Publication Date: 2007-07-18
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, there is a problem that, in the case of providing a small-scale virtual LAN composed of several nodes, at least one virtual hub is required, and if the running cost for setting and managing the virtual hub is considered, it is difficult to start small ( small start)
[0009] In addition, since the communication in the virtual LAN always passes through the virtual hub, the traffic load and processing load related to the virtual hub increase with the traffic in the virtual LAN, so there is a problem of scalability.
[0010] In addition, when the virtual hub fails, or when the link that accommodates the virtual hub on the backbone network fails, the virtual LAN itself cannot be used.
That is, there is a problem with the reliability of the system since the virtual hub becomes a single point of failure

Method used

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  • Virtual LAN system and node device
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Embodiment Construction

[0023] Next, embodiments of the present invention will be described in detail with reference to the drawings.

[0024] Referring to FIG. 2, the embodiment of the present invention is composed of nodes A21-A23 and a backbone network C2. Between each node, the virtual link is formed by the communication tunnels Ct21-Ct23, and the Ethernet packet corresponding to the communication in the virtual LAN is encapsulated and then forwarded. In Fig. 2, although the communication tunnels are generated in a complete mesh among the three nodes, in fact, the communication tunnels do not need to be generated in a complete mesh between the nodes participating in the virtual LAN, and the nodes participating in the virtual LAN are formed by The communication tunnel constitutes any topology for packet forwarding, and packets are forwarded on the corresponding topology.

[0025] The nodes A21 to A23 are nodes participating in the virtual LAN, and are constituted by computers having communication...

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Abstract

A node (A21) has a packet transfer table (A2141) for setting a peer-to-peer type communication tunnel for encapsulating a data link layer packet to / from other nodes participating in the virtual LAN and transmitting the data link layer packet received from a communication tunnel to another communication tunnel. Furthermore, when another node is removed from the virtual LAN, the node (A21) reconfigures the topology of the virtual LAN by using the topology calculation unit (A2153) and establishes or deletes the communication tunnel according to the topology reconfigured by using a tunnel control unit (A2152).

Description

technical field [0001] The present invention relates to a virtual LAN system, and more particularly to a virtual LAN that is virtually established by using a communication tunnel on a physical network. A virtual LAN system and a node device that can provide a virtual LAN through a communication tunnel. Background technique [0002] In the existing virtual LAN (Local Area Network) system, as described in Japanese Patent No. 3343064 (page 26, FIG. 16 ), a system for providing a virtual LAN environment through a simulated network adapter and a tunnel server is used. Nodes participating in such a virtual LAN have a virtual adapter (virtual interface, also called virtual NIC) that groups data link layer networks between itself and a tunnel server (virtual hub, also called virtual bridge) (Ethernet (registered trademark) packets, etc.) are encapsulated and transmitted and received, thereby simulating a virtual LAN environment on the physical network. [0003] Using FIG. 1, the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L12/46H04L12/70
CPCH04L45/02H04L12/4633H04L12/4641H04L12/4675
Inventor 藤田范人小出俊夫
Owner NEC CORP