Method and device for dropping packets

Abstract

The invention discloses a method and device for dropping packets. In the embodiment of the invention, the current buffer drop precedence is obtained according to the size of the current free buffer space by detecting the size of the current free buffer space, and whether the precedence of the packets needing to be buffered is lower than or equal to the current buffer drop precedence is judged, if so, the packets are dropped. By implementing the embodiment of the invention, when the size of the current free buffer space is smaller, the precedence of the packets which can pass through the space is higher, thereby reducing the influence of partial queue congestion on the important packets with high precedence, avoiding short congestion buffering of partial links from influencing normal communications of other normal links to some extent and avoiding large-area network paralysis.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for discarding messages. Background technique [0002] In packet management, in order to avoid packet congestion on the transmission link, a strategy of tail drop or random drop is usually adopted to better prevent memory overflow and network paralysis by discarding packets. With the development of network technology and the expansion of the number of network processing ports, the requirements for service quality refinement are enhanced, and the memory requirements are also increased. In actual operation, each message often adopts a shared memory method. [0003] In the shared memory mode, the method of discarding packets using the tail drop strategy can be as follows: real-time detection of the number of buffered packets in the current queue; judging whether the remaining space of the current buffer reaches the configured packet size according to the n...

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Problems solved by technology

[0004] During the research and practice of the prior art, the inventors of the present invention found that in the shared memory mode, if tail discard or random discard strategy is used to manage messages, when some port queues are congested, a large number of messages will be discarded. As a result, the memory is insufficient for buffering, and the packets of other ports that are not congested or the congestion is not serious may not be cached, and the packets of these ports that are not congested or not congested are also discarded, resulting in large-scale network interruption.

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