Method achieving Open flow two-stage flow table through chip loopback and system thereof

Abstract

The invention provides a method achieving an Open flow two-stage flow table through a chip loopback and a system of the method achieving the Open Flow two-stage flow table through the chip loopback. The method includes: S1, receiving and parsing a message, and obtaining header information and tag information of a message inlet interface; S2, searching in a first stage flow table to match corresponding flow behavior according to the header information and the tag information; S3, judging whether the flow behavior is 'sending to a second stage flow table', if the flow behavior is 'sending to a second stage flow table', the message inlet interface maps an internal interface, and sends the message to the outlet of the chip through a loopback of the chip, at the moment the internal interface is the inlet interface, the message inlet interface parses the message and searches in the second stage flow table, matches corresponding flow behavior, and conducts step S4; if the flow behavior is not 'sending to a second stage flow table', conducting step S4 directly; S4, processing the message correspondingly according to the flow behavior. On the basis of keeping chip cost, the method achieving the Open flow two-stage flow table through the chip loopback and the system of the method achieving the Open flow two-stage flow table through the chip loopback increase numbers of flow entries and support more flow behaviors through building the two-stage flow table of Open flow, and directional logic of the two grade flow tables is simple.

Description

technical field [0001] The present invention relates to the technology in the field of network communication, in particular to a method and system for implementing Openflow two-level flow tables through chip loopback. Background technique [0002] Openflow was first proposed by Stanford University to test and verify new protocols in traditional network equipment. Such as figure 1 As shown, each Openflow switch has a flow table (Flow Table) for packet lookup and forwarding. The switch can be connected to the external controller (Conrtoller) through a secure channel (Secure Channel) through the Openflow protocol to query and manage the flow table. [0003] The flow table is the core data structure for the switch to control the forwarding policy, including header fields, counters, and zero or more behaviors. The matching field of the message is searched in the flow table, and if the match is successful, the relevant action is executed, otherwise the message is forwarded to t...

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Problems solved by technology

[0004] In the prior art, the existing method is to divide the TCAM (ternary content addressable memory) to realize the multi-level flow table. However, the multi-level flow table realized by the above-mentioned way of dividing the TCAM, the orientation of the flow table will be more complicated, and each Adding a first-level flow table will greatly increase the logic of the chip, and the chip needs to be redesigned, and because it cannot be shared, the function of the chip is also limited

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