Local network, particularly Ethernet network having redundancy properties, and redundancy manager for such a network

A manager and local area network technology, applied in the field of coupling devices, can solve problems such as network bandwidth occupation, inability to transmit useful data traffic, network unusability, etc., and achieve the effect of improving usability

Inactive Publication Date: 2005-07-13
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can cause Telegram to go around in circles in the ring
In the worst case, the bandwidth of the network available for data traffic is occupied such that useful data traffic can no longer be transmitted between users connected on the network
Therefore, the network is not available or only available on a small scale to connected users when this error occurs

Method used

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  • Local network, particularly Ethernet network having redundancy properties, and redundancy manager for such a network
  • Local network, particularly Ethernet network having redundancy properties, and redundancy manager for such a network

Examples

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Embodiment Construction

[0015] exist figure 1 In the network shown, four coupling devices K1 , K2 , K3 and RM are interconnected, wherein the coupling device RM operates as a redundancy manager. These coupling devices each have four ports P11 . . . P14 , P21 . . . P24 , P31 . . . P34 and P41 . The coupling devices K1 to K3 and RM work as layer 2 components, that is, they correspond to an internally stored address table for message forwarding. They are connected to each other through the connection of two ports of adjacent devices to form a ring topology. To this end, the ports P12 and P21 are interconnected by glass fiber cables F12 and F21. Naturally, copper cables can also be used for this purpose. Line F12 is used to transmit telegrams from port P12 of coupling device K1 to port P21 of coupling device K2. In the opposite direction, the telegram is transmitted from port P21 of coupling device K2 to port P12 of coupling device K1 via line F21. In this way, so-called full-duplex transmission is ...

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PUM

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Abstract

The invention relates to local area networks with redundant properties, in particular Ethernet networks, in which coupling devices (K1, K2, K3) and redundancy managers (RM) are interconnected in a ring topology. The redundancy manager (RM) disconnects if it receives its first test telegram (T11, T12) from one port (P41, P42) on the other port (P42, P41) respectively in a predetermined time interval ring to establish a linear topology, otherwise a connection is made. Use at least one coupling device (K3) as a redundancy manager observer to analyze the telegrams received at the port (P32) connected to the redundancy manager (RM), if not only received at this port (P32) First test telegram (T11) and in the received first test telegram (T11) shows the redundancy manager (RM) "ring broken" status, the ring is broken to establish a linear topology. This prevents the telegram from going around in circles.

Description

technical field [0001] The invention relates to a redundant local area network (in particular Ethernet) according to the general concept of claim 1 and a coupling device for such a network according to the general concept of claim 6 . Background technique [0002] A local Ethernet network with redundancy is disclosed in WO 99 / 46908. In the network described therein, coupling devices and redundancy managers are implemented as Layer-2 components (Layer-2-Komponenten) each with at least two ports, which are each connected to each other via the connection of two ports of adjacent devices. form a ring topology. Herein, "2-layer component" means that at least layers 1 and 2 of the ISO-OSI-7-layer model are implemented in the device. The device thus performs address calculation and telegram forwarding (Telegrammweglenkung). In normal operation, ie no faults occur in the network, the ring is separated by the redundancy manager. This means that telegrams received by the redundanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/22H04L12/413H04L12/42H04L12/423H04L12/437H04L69/40
CPCH04L1/22H04L12/40182H04L12/403H04L12/42H04L12/423H04L12/437H04L43/50H04L69/40
Inventor 迈克尔·科斯特纳哈拉尔德·思拉姆
Owner SIEMENS AG
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