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Dual-ring switch for RSTP networks

A technology of switch and switching structure, applied in the field of double-ring switch of RSTP network

Inactive Publication Date: 2014-04-16
SCHNEIDER ELECTRIC IND SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to this limited scalability, depending on the network configuration, network devices that implement failback cannot operate normally with other devices on the network during downtime or during recovery

Method used

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  • Dual-ring switch for RSTP networks
  • Dual-ring switch for RSTP networks
  • Dual-ring switch for RSTP networks

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0018] now refer to figure 1 , shows the network topology of a multi-ring computer system of a primary ring 101 with two secondary rings 102 and 103. The figure shows multiple network devices on the primary ring and each secondary ring, which in an industrial automation system would typically include network controllers such as programmable logic controllers (PLCs) or A distributed input / output (DIO) controller in which multiple other devices, such as input / output (IO) devices, interact. A dual ring switch (DRS) 104 is connected and configured to operate between the primary ring and the first secondary ring, while a second dual ring switch 105 is connected and configured to operate between the primary ring and the second secondary ring.

[0019] Each dual-ring switch supports two network rings, a primary ring and a secondary ring. A dual ring switch operates by keeping the control planes of the two rings separate while consolidating the data plane. Separation of the control...

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PUM

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Abstract

A dual-ring computer network architecture for industrial automation systems includes a dual-ring switch for interconnecting two networks, such as Rapid Spanning Tree Protocol (RSTP) networks. The dual-ring switch may provide separate control planes between the two networks but a common data plane between the networks. The system topology may include a main ring and a sub-ring, which creates separate fault regions for isolation. Using this configuration, the standard RSTP practical limit of 32 devices is no longer a limit, as the use of the dual-ring switch provides a mechanism to expand the total number of devices up to 256 while maintaining the network recovery time to within a target of 50 milliseconds. This allows for the use of dual rings using the RSTP protocol on a single switch. In another embodiment, two dual-ring switches are configured in the same sub-ring for redundancy.

Description

[0001] This application claims priority to US Provisional Application No. 61 / 502,861, filed June 30, 2011, which is hereby incorporated by reference in its entirety. Background technique [0002] In many computer systems, especially those used in industrial automation and industrial control, network reliability and network uptime are important to the ongoing operation of an underlying service or underlying operation. In general, it is important that network failures be quickly isolated and the network restored immediately. Therefore, fault isolation and automatic recovery under network failure conditions may be important for higher bandwidth networks and mission-critical applications. Even in typical network failure and recovery scenarios, delays on the order of a few hundred milliseconds can have undesirable consequences. [0003] In a typical failure recovery scenario, when a failure occurs, data traffic is rerouted or switched from the currently failed path to a backup pat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/437H04L12/46
CPCH04L12/462H04L12/437H04L12/4637
Inventor 乔治·A·迪策尔三世
Owner SCHNEIDER ELECTRIC IND SAS