Packet routing switch device and method thereof

Abstract

The invention relates to network communication technology, in particular to the technology of message routing and exchange in wide area network communication. A message routing and switching device, comprising: a host CPU, a three-layer switching unit and a WAN sub-card; the host CPU obtains and maintains a first mapping relationship and a second mapping relationship, and sends them to the three-layer switching unit and the WAN sub-card respectively; After receiving the message, the layer-3 switching unit searches for the first mapping relationship to obtain the virtual channel identification information, and after adding the virtual channel identification information to the message, sends the message to the WAN sub-card; the WAN sub-card receives Search the second mapping relationship after the message, obtain the corresponding virtual channel number of the WAN interface, and send the message to the corresponding virtual channel of the WAN interface. In addition, the present invention also includes a message routing and switching method. The present invention accelerates the speed of message forwarding due to the technology that the sub-card of the wide area network is used to assist the three-layer switching chip to replace the host CPU to complete the forwarding work of the wide area network message.

Description

technical field [0001] The invention relates to network communication technology, in particular to the technology of message routing and exchange in wide area network communication. Background technique [0002] OSI (Open Systems Interconnection, Open System Interconnection) defines the communication process as seven layers, namely the physical layer, data link layer, network layer, transport layer, session layer, presentation layer and application layer, and each layer exists independently of. These seven layers divide the task of transferring information between networked computers into seven smaller, more manageable task groups. Each task or task group is assigned to each OSI layer, and the tasks assigned to each layer can be executed independently. Layers 7 to 4 basically deal with end-to-end communication between data sources and data destinations, while layers 3 to 1 basically deal with communication between network devices. [0003] Among them, the second layer, th...

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Problems solved by technology

[0027] Because in the three-layer switch implementation scheme of the prior art, forwarding messages between various interfaces of the wide area network and Ethernet interfaces requires the host CPU of the three-layer switch to perform routing search work first, and then perform interface forwarding work, causing the host The CPU has heavy tasks and low efficiency, which becomes the bottleneck in the forwarding path

Therefore, high-speed interfaces on various routers cannot achieve wire-speed forwarding, such as ATM (Asynchronous Transfer Mode, asynchronous transfer mode), Pos (Packet over SONET, packet transmission network through synchronous optical network) high-speed interfaces, it is difficult to reach 155M s speed

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