Stream aging method and network appliance

Abstract

The invention discloses a stream aging method and network device. The method comprises steps of: establishing a forward directional stream table, a reverse directional stream table and a session table, wherein the forward and reverse directional stream tables comprise identifier information and a session table index of the stream, the session table comprises accelerating transmitting information of the forward and reverse directional streams; receiving the forward and reverse directional stream packages, searching the forward and reverse directional stream tables according to the identifier in the package; searching the session table according to the session table index in the stream table; transmitting the package according to the accelerating transmitting information in the session table; when the session table hit exceeds, deleting the session table and corresponding forward and reverse directional stream tables. The invention relates the forward and reverse directional stream tables with unified session tables. Stream aging depends on aging of the session tables, which avoids session early termination caused by unilateral stream termination and saves resources.

Description

Technical field [0001] The present invention relates to the technical field of flow acceleration, in particular to a flow aging method and network equipment. Background technique [0002] With the development of the network, the network bandwidth is increasing day by day. Devices that rely solely on a general-purpose central processing unit (CPU) to process network services cannot meet the needs of high-end users in terms of performance. Therefore, special CPUs, including : Network Processor (NP, Network Processor), Application Specific Integrated Circuit (ASIC, Application Specific Integrated Circuit), Field Programmable Gate Array (FPGA, Field Programmable Gate Array), etc., to improve processing capabilities. This kind of general-purpose, relatively stable demand part of the work is handed over to a dedicated CPU, and some more complicated such as: Application Level Gateway (ALG, Application Level Gateway) processing, requirements such as: firewall security policy work handoff...

AI Technical Summary

Problems solved by technology

[0005] In the network device shown in Figure 1, the forward and reverse flow tables are maintained separately. In this way, when some applications only have one-way flow for a long time, the flow table in the opposite direction will be aged, resulting in the session Terminated prematurely, the application is forced to be interrupted

[0006] In order to avoid premature session aging caused by unidirectional flow, the aging time of flow can be set longer, but for most services with stable bidirectional flow, it will cause a large waste of resources

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