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Multilevel flow table-based Openflow message forwarding method and system

A technology of message forwarding and flow table, applied in the field of network communication, can solve the problems of high cost and system cost burden, and achieve the effect of system cost control

Inactive Publication Date: 2013-03-06
SUZHOU CENTEC COMM CO LTD
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Problems solved by technology

[0003] In the existing technology, in order to improve the flexibility of the system, multi-level flow tables are often constructed in the form of TCAM (ternary content addressable memory) tables. However, in the ASIC (Application Specific Integrated Circuit) design process, if in order to obtain more flow table entries, it is necessary to increase the number of TCAM tables, and because the high cost of TCAM brings a burden to the cost of the entire system, obviously, this is impractical

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  • Multilevel flow table-based Openflow message forwarding method and system
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  • Multilevel flow table-based Openflow message forwarding method and system

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with specific embodiments shown in the accompanying drawings. But these embodiments do not limit the present invention. Based on the various embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work should be included in the protection scope of the present invention .

[0029] ginseng figure 1 As shown, in a specific embodiment of the present invention, a kind of Openflow message forwarding method based on multi-stage flow table, it comprises the steps:

[0030] S1. Construct at least the first, second, and third-level flow tables that are serially arranged in sequence, wherein the first and second flow tables are constructed in the form of a ternary content addressable memory (TCAM), and Provide high flexibility; the third-level flow table is constructed in the form of a hash table (HASH) to provide a large number of flow table...

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Abstract

The invention provides a multilevel flow table-based Openflow message forwarding method and a multilevel flow table-based Openflow message forwarding system. The method comprises the following steps of: at least constructing a primary flow table, a secondary flow table and a tertiary flow table sequentially in series, wherein the primary and secondary flow tables are constructed in a ternary content addressable memory (TCAM) form, the tertiary flow table is constructed in a Hash table form, and the primary, secondary and tertiary flow tables can be used independently or in a combined way; searching for forwarding operation over a message on the basis of the primary, secondary and tertiary flow tables; and forwarding the message according to the forwarding operation. Particle sizes of the primary, secondary and tertiary flow tables are decreased, and the tertiary flow table is constructed in the Hash table form, so that the tertiary flow table can acquire more flow items, and the system cost is controlled.

Description

technical field [0001] The invention relates to the technology in the field of network communication, in particular to an Openflow message forwarding method and system based on a multi-level flow table. Background technique [0002] Openflow is currently the most important solution in the SDN (Software Defined Networking) network. In order to obtain more flow entries, the Openflow switch system often supports multi-level flow tables according to Openflow specification requirements. Multi-level flow tables mean that a message entering an Openflow switch can be processed in different flow tables according to different fields. Lookup, and the result of the previous flow table can affect the table lookup process of the subsequent flow table. [0003] In the existing technology, in order to improve the flexibility of the system, multi-level flow tables are often constructed in the form of TCAM (ternary content addressable memory) tables. However, in the ASIC (Application Specifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/70
Inventor 方沛昱廖继平张卫峰
Owner SUZHOU CENTEC COMM CO LTD
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