How to translate flow meter switch | hydrostatic pocket | GE manufacturers ultrasonic flowmeter usage instructions

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1. Principle of OpenFlow

OpenFlow is a network communication protocol, whose core principle is to centrally control switches through controllers, use flow tables, group tables, Meter tables and other structures to achieve flexible data forwarding and processing, and complete communication between controllers and switches through OpenFlow channels. The specific principle is as follows: switch structure and table type OpenFlow switch structure: OpenFlow switches can be divided into two parts: flow tables and secure channels. The flow table is responsible for matching and processing data packets, while the secure channel is used for communication with the controller. Table types: OpenFlow tables include flow tables, group tables, and Meter tables. The support for tables varies in different versions of the specification, for example, OpenFlow 1.0 only defines flow tables, while version 1.3 adds group tables and Meter tables. Flow Table function: Stores flow table entries for packet matching and processing. Flow table item composition: Matching field: used to distinguish different data flows. After entering the switch, network packets will be matched with flow table entries, and packets that match the same flow table entry are called data flows. Instruction set: After successful packet matching, relevant instructions need to be executed to complete data processing, such as forwarding, modifying fields, etc. Counter: records statistical information such as the number of packets and bytes that match the flow table entry, used for traffic monitoring and analysis. Group Table function: Define a set of actions that can be shared by multiple flow table entries. Application scenario: Multicast: Copy and forward data packe

ts to multiple ports. Load balancing: Allocate traffic to different paths according to a certain algorithm. Disaster recovery backup: When the primary path fails, it automatically switches to the backup path. Aggregation: virtualizing multiple physical links into a logical link to improve bandwidth utilization. Meter Table function: Used for measuring and speed limiting, setting speed limits and other rules for convection through meter items. Application scenario: Implement rich QoS (Quality of Service) functions, such as limiting the bandwidth of specific traffic to ensure that critical services receive sufficient network resources. OpenFlow channel function: As a communication channel between the controller and switch, responsible for forwarding OpenFlow messages/packets. Message type: Controller to Switch: initialized by the controller and issued to the switch, may require the switch to reply with corresponding messages, used for the controllers configuration and management of the switch. Asynchronous: Sent asynchronously from the switch to the Kusun Xiao controller without waiting for the controllers request. The switch informs the controller of the arrival of new data packets and changes in switch status, such as changes in port status and error messages, through such messages. Symmetric: It can be sent by either the controller or the switch without the need for permission or invitation from the other party, and is used for establishing and maintaining communication connections and other common functions.

How to translate 2. Hydrostatic pocket

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How to translate flow meter switch | hydrostatic pocket

1. Principle of OpenFlow

How to translate 2. Hydrostatic pocket

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