A method for realizing network recovery in loop network

A ring network and network recovery technology, applied in the field of Ethernet communication, can solve the problems that cannot meet the real-time requirements of industrial control networks, and achieve the effect of ensuring availability and normal operation

Active Publication Date: 2008-09-10
SHANGHAI AUTOMATION INSTRAION CO LTD
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AI Technical Summary

Problems solved by technology

[0002] Due to its openness, stability, low cost, high transmission rate, easy networking and many other advantages, Ethernet technology gradually enters the field of industrial control and becomes an integral part of the automatic communication network. The network recovery method commonly used in Ethernet It is the STP (Spanning Tree) protocol and RSTP (Rapid Spanning Tree) protocol. Since the network recovery time is 2 seconds to 20 seconds, it cannot meet the real-time requirements of industrial control network communication.

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  • A method for realizing network recovery in loop network
  • A method for realizing network recovery in loop network
  • A method for realizing network recovery in loop network

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing and specific implementation method, the present invention is described in further detail:

[0017] 1. Device initialization configuration

[0018] Such as figure 1 The ports forming the ring network among the devices in the shown ring network have a forwarding state and a blocked state. The ports in the blocked state only forward link detection packets, and the ports in the forwarding state forward all packets. Before entering the communication work, device initialization configuration is required. In addition to the conventional network device related parameter configuration, the feature of the present invention is to perform communication configuration on the switch device, including: communication macro cycle, link detection message sending time link detection message Preset parameters such as receiving timeout time, synchronous clock type, sequence number of switch equipment, number of switch equipment, etc.

[0019] ...

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Abstract

The invention discloses a method for recovering networks in a ring network. Ethernet switch equipment enters a communication status after an initial configuration and precise time synchronization based on an IEEE 1588 protocol. Each equipment according to the configuration of the network sends out time-sharing equipment statement messages and link circuit checking messages. The link circuit checking messages are sent by a multicast address in two ways; if a port of equipment receives no link checking messages of a connected port after the time out, then a network trouble can be determined and link circuit alarm messages are sent by the multicast address in two ways for alarming. The rest equipments in the ring network after receiving the link circuit alarm message, then empty an FDB list and utilize a backup link circuit to restart path learning. By adopting the method of the invention, any communication link circuit failure in the ring network can be quickly detected and correspondingly processed, thereby meeting the availability requirements of Ethernet communication by the industrial automatic field.

Description

technical field [0001] The invention belongs to the technical field of Ethernet communication, and in particular relates to a method for realizing network restoration in a ring network. Background technique [0002] Due to its openness, stability, low cost, high transmission rate, easy networking and many other advantages, Ethernet technology gradually enters the field of industrial control and becomes an integral part of the automatic communication network. The method of network recovery commonly used in Ethernet It is the STP (Spanning Tree) protocol and RSTP (Rapid Spanning Tree) protocol. Since the network recovery time is 2 seconds to 20 seconds, it cannot meet the real-time requirements of industrial control network communication. Contents of the invention [0003] The technical problem to be solved by the present invention is that a method for implementing communication redundancy in a ring network is needed, which aims to quickly detect link failures and equipment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/437H04L12/26H04L12/56H04L45/28
Inventor 张庆军包伟华
Owner SHANGHAI AUTOMATION INSTRAION CO LTD
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