Packet routing switch device and method thereof

Abstract

The invention relates to network communication technology, in particular to a message routing and switching technique in wide-area network communication. A message routing and switching device comprise a host CPU, a three-layered switching unit, and a wide-area network sub-card. The host CPU obtains and maintains a first mapping relation and a second mapping relation, and respectively transmits to the three-layered switching unit and the wide-area network sub-card; the three-layered switching unit, after receiving the message, searches the first mapping relation and obtains virtual channel identification information, and transmitting the message to the wide-area network sub-card when the virtual channel identification information is added to the message; the wide-area network sub-card, after receiving the message, searches the second mapping relation and obtains a corresponding wide-area network interface virtual channel number, and transmits the message to the corresponding wide-area network interface virtual channel. In addition, the invention also provides a message routing and switching method. In the invention, the wide-area network sub-card assists the three-layered switching chip to replace the host CPU to carry out message retransmission in the wide-area network, so as to improve the speed of message retransmission.

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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