A method and device for splitting and reorganizing switch data packets

Abstract

The invention discloses a method and device for splitting and recombining data packets of a switch, belonging to the technical field of communication. The method provided by the invention includes: a splitting method and a recombining method. The segmentation method includes: pre-segmenting the data packet and then caching, adopting the data management method of information cache and data cache, when the data of the payload size of an internal cell is cached, it starts to generate and send the cell; the reorganization method includes: using In the data management mode of information cache and VIQ cache, data packet reassembly is completed during the process of storing cell payloads into VIQ cache respectively. The device provided by the present invention includes: a segmentation module and a reassembly module in the switch, so as to realize the above method. The method and device can efficiently complete data packet segmentation and reassembly, the data management is simple and easy, can effectively reduce segmentation delay and delay jitter, and improve switching efficiency.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a method and a device for splitting and recombining data packets of a switch. Background technique [0002] Switches are the foundation of modern large networks. In the current switch design, in order to improve the performance of the switching system, fixed-length packet switching technology is widely used in the processing of data packets. Fixed-length packet switching technology requires that variable-length data packets be cut into fixed-length cells at the input end of the switch, then switched through the switching structure, and finally the cells are reassembled into original data packets at the output end before forwarding. Fixed-length packet switching enables all switching units of the entire switching structure to operate synchronously, which is simple to implement, and the cells to be switched are small in size and the switching delay is short. [...

AI Technical Summary

Problems solved by technology

Therefore, when the data packet is long, it needs to wait for a long time, resulting in a large segmentation delay

[0006] 2. The delay jitter is obvious when the packet length changes greatly

For example, in the fiber channel protocol, the longest frame is 2148 bytes, and the shortest frame is 36 bytes. Using the existing segmentation technology, the delay of the segmentation module differs by dozens of times.

[0007] 3. A large amount of storage resources are required, and address management is complicated

[0010] 2. From the time when the data packet is stored in the "input buffer" to when it is read out from the "input buffer", there is still a large delay in the long data packet and a large change in the length of the data packet. The delay jitter is large

[0011] 3. When data congestion occurs in the switch, the data cannot be read out in time from the segmentation cache in the "segmenter", and the segmentation cache is not enough to store the complete data packet, so the content of the data packet may occur in this part lost

[0012] 4. The address management in the "segmenter" is complex and requires a dedicated address management module

[0013] The existing internal cell reorganization technology of the switch mainly uses RAM storage, and achieves the purpose of reorganization through address processing. The address management of this technology is complicated.

Images