CN102111299A - Redundant network system and method for realizing redundancy - Google Patents
Redundant network system and method for realizing redundancy Download PDFInfo
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Abstract
The embodiment of the invention discloses a redundant network system suitable for the real-time Ethernet and method for realizing redundancy. The redundant network system comprises no less than one network bridge node and no less than two common nodes, wherein each common node comprises a first network interface and a second network interface, the physical address of the first network interface is the same with that of the second network interface, and the logical addresses of the two network interfaces are the same; each network bridge node comprises a first ring network interface, a second ring network interface and an external network interface, the physical address of the first ring network interface is the same with that of the second ring network interface, and the logical addresses of the two ring network interfaces are the same; both the physical address and the logical address of the external network interface are different from those of the first ring network interface and the second ring network interface; and the common nodes and the network bridge nodes are connected in sequence to form a ring redundant network. By adopting the technical scheme provided by the embodiment, the failure rate of the real-time Ethernet can be remarkably lowered, and the redundancy and feasibility of the real-time Ethernet are improved.
Description
Technical field:
The present invention relates to Ethernet communication technology field, relate in particular to a kind of redundant network system and redundant implementation method thereof applicable to real-time ethernet.
Background technology:
Ethernet is the most general communication protocol standard that existing now local area network (LAN) adopts.Along with development of Ethernet technology, ethernet communication in the application of industrial circle also more and more widely, the availability that industrial stable operation and benefit improve for real-time ethernet has proposed more and more higher requirement, so the high availability of real-time ethernet also more and more comes into one's own.
At the high availability requirement of real-time ethernet, what generally adopt at present is the communication mode of bus type structure and hub-and-spoke configuration.The real-time ethernet of bus type structure adopts coaxial cable as transmission medium usually, connects simply, and required cable is less, and need not the special-purpose network equipment, is applied in usually in the small-scale network.The real-time ethernet convenient management of hub-and-spoke configuration, the easy network equipment of expanding, need be special-purpose are as the server node, by twisted-pair feeder each main frame in the local area network (LAN) is connected on the core node, can very easily extension of network be arrived very big scale by the mode of cascade, therefore obtained using widely, adopted by the real-time ethernet of the overwhelming majority.
Yet in the above-mentioned bus-network, if having place's circuit or node to break down, whole network can't be communicated by letter; Simultaneously, in the Star Network, break down if connect the core node switch of each host node, whole network also will be communicated by letter.No matter be the bus type structure or the real-time ethernet of hub-and-spoke configuration, increase along with communication node number in the commercial Application, the failure rate of network all can sharply increase, therefore the redundancy and the reliability of above-mentioned existing real-time ethernet are all lower, are difficult to satisfy preferably the requirement that industrial circle is used.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of redundant network system and redundant implementation method thereof applicable to real-time ethernet, to keep the proper communication of network under the situation that is implemented in place's line fault, and under the situation of node failure, keep the proper communication between other node in the network, reduce the failure rate of real-time ethernet, improve its redundancy and availability.
For this reason, the embodiment of the invention provides following technical scheme:
A kind of redundant network system comprises:
Be no less than a bridge and be no less than two ordinary nodes;
Described ordinary node comprises first network interface and second network interface, and described first network interface is identical with the physical address of second network interface, and both logical addresses are identical;
Described bridge comprises the first looped network interface, the second looped network interface and outer network interface, and the described first looped network interface is identical with the physical address of the second looped network interface, and both logical addresses are identical; The physical address of described outer network interface and logical address are all different with the physical address and the logical address of the first looped network interface or the second looped network interface;
The first looped network interface of first network interface of described ordinary node and second network interface and bridge is connected successively with the second looped network interface, constitutes the ring-shaped redundant network.
Preferably, the outer network interface of described bridge is connected to the equipment interface beyond the described ring-shaped redundant network, is used for communicating by letter of ring-shaped redundant network and outer net.
Preferably, comprise the communication mode control module in each node of described ring-shaped redundant network, be used to be provided with and switch the communication mode of each node, make it adopt timesharing mechanism, master-slave mode mechanism or mode that both combine to communicate.
Preferably, during described ring-shaped redundant network using master-slave mode communication mechanism, wherein having and only have an ordinary node or bridge is host node, and described host node is used for controlling the sending order of each node message of this network.
The present invention also provides a kind of redundant implementation method, in the above-mentioned redundant network system, comprising:
Node sends redundant each other message simultaneously by two interfaces that are connected with other nodes in the ring-shaped redundant network, and receives the message in the ring-shaped redundant network;
Node judges whether the message that receives is the unicast message of issuing this node, if then need not to transmit this message, otherwise enter next step;
Node judges whether the message that receives is the message that this node self sends, if, then need not to transmit this message, otherwise, transmit this message to another network interface or the looped network interface of this node.
Preferably, bridge also comprised before E-Packeting:
Whether the message that judgement will send is to be transmitted to the message of ring-shaped redundant network with external equipment, if the outer network interface that then passes through this bridge is to the ring-shaped redundant network described message of device forwards in addition.
Preferably, described redundant implementation method also comprises:
Bridge receives the message that ring-shaped redundant network equipment in addition sends by outer network interface, and judges whether this message needs to transmit in the ring-shaped redundant network, if then carry out next step;
Bridge is transmitted this redundant each other message by the first looped network interface and the second looped network interface in the ring-shaped redundant network.
Preferably, described redundant implementation method also comprises:
Ordinary node or the bridge set in the ring-shaped redundant network are host node, and all the other nodes are from node;
Host node allows to send message commands to sending from node, to control the message sending order of all nodes.
Preferably, described redundant implementation method also comprises:
Set ring-shaped redundant network using tdm communication mechanism, for each ordinary node distributes different transmitting time grooves with bridge;
Each ordinary node and bridge send corresponding message in the time slot that self is assigned to.
Preferably, each ordinary node and bridge are carried out clock synchronization according to the IEEE1588 agreement, adopt defined boundary clock model, end-to-end transparent clock model or peer-to-peer transparent clock model among the IEEE1588.
Preferably, described redundant implementation method also comprises:
Ordinary node or the bridge set in the ring-shaped redundant network are in the master clock state, as the clock source of other nodes in this ring-shaped redundant network;
Other all nodes in this ring-shaped redundant network are all synchronous with this master clock.
Preferably, the master clock node is the node of user's appointment, or the node that is produced by all node sustainable competition in the ring-shaped redundant network.
Preferably, described redundant implementation method also comprises:
When inserting new ordinary node or bridge in the described ring-shaped redundant network, itself and master clock are carried out clock synchronization;
After the success, the new node that inserts sends corresponding message in the time slot that self is assigned to synchronously.
Preferably, described redundant implementation method also comprises:
Ordinary node or the bridge set in the ring-shaped redundant network are host node, and all the other nodes be from node, are the different transmitting time groove of each ordinary node and bridge distribution simultaneously;
Each ordinary node and bridge send corresponding message in the time slot that self is assigned to, in all unappropriated time slot of all nodes, host node allows to send message commands to sending from node, controls the message sending order of all nodes.
Preferably, described redundant implementation method also comprises:
Each node in the ring-shaped redundant network periodically transmitting line is checked request message;
Each node is after receiving inspection of line request message, and transmitting line is checked response message;
The initiation node receiving lines of inspection of line request message is checked response message and is write down its sending node, is used for judging the type and the position of ring-shaped redundant network fault.
Preferably, if each interface of the initiation node of inspection of line request message does not all receive the inspection of line response message of a certain node feedback, the circuit of then judging this node cisco unity malfunction or connecting two interfaces of this node all has fault.
Preferably, if first network interface of the initiation node of inspection of line request message or the first looped network interface receive the inspection of line response message of node feedback, second network interface or the second looped network interface do not receive the inspection of line response message of this node feedback, then judge the cable fault that is connected with second network interface or the second looped network interface.
Compared with prior art, technique scheme has the following advantages:
In the technical scheme that the embodiment of the invention provided, the data of transmitting in the ring-shaped redundant network all are two parts of redundant each other messages, and independently transmit on the circuit mutually at two, so any one circuit is when breaking down, this ring-shaped redundant network system still can proper communication; If a plurality of nodes that have only place's node to break down or break down are adjacent, so still can proper communication between other nodes.This redundant network system applies can significantly reduce its failure rate in real-time ethernet the time, improves its redundancy and availability.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The redundant network system configuration schematic diagram that Fig. 1 provides for embodiment one;
Schematic diagram when circuit between the ordinary node that Fig. 2 a and 2b provide for embodiment one or the circuit between bridge and the ordinary node break down;
The redundant implementation method schematic flow sheet that Fig. 3 provides for embodiment two;
The bridge workflow schematic diagram that Fig. 4 provides for embodiment two.
Embodiment
The embodiment of the invention provides a kind of redundant network system, comprising: be no less than a bridge and be no less than two ordinary nodes; Described ordinary node comprises first network interface and second network interface, and described first network interface is identical with the physical address of second network interface, and both logical addresses are identical; Described bridge comprises the first looped network interface, the second looped network interface and outer network interface, and the described first looped network interface is identical with the physical address of the second looped network interface, and both logical addresses are identical; The physical address of described outer network interface and logical address are all different with the physical address and the logical address of the first looped network interface or the second looped network interface; The first looped network interface of first network interface of described ordinary node and second network interface and bridge is connected successively with the second looped network interface, constitutes the ring-shaped redundant network.
It more than is the application's core concept, below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
A lot of details have been set forth in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from alternate manner described here and implement, those skilled in the art can do similar popularization under the situation of intension of the present invention, so the present invention is not subjected to the restriction of following public specific embodiment.
Embodiment one:
The embodiment of the invention provides a kind of redundant network system, can preferably be applicable to the network system of being made up of the real-time ethernet technology, reduces the failure rate of real-time ethernet, improves its redundancy and availability.As shown in Figure 1, be a kind of structural representation of this system, it comprises:
Be no less than a bridge 10 and be no less than two ordinary nodes 20;
Described ordinary node comprises first network interface 201 and second network interface 202, and described first network interface 201 is identical with the physical address of second network interface 202, and both logical addresses are identical;
Described bridge comprises the first looped network interface 101, the second looped network interface 102 and outer network interface 103, and the described first looped network interface 101 is identical with the physical address of the second looped network interface 102, and both logical addresses are identical; The physical address of described outer network interface 103 and logical address are all different with the physical address and the logical address of the first looped network interface 102 or the second looped network interface 102;
In the above-mentioned ring-shaped redundant network, exist two separate circuits to communicate between any two nodes, when wherein a circuit broke down, another circuit still can proper communication.When ordinary node need send message, send redundant each other message simultaneously by two network interface.When bridge need send message, send redundant each other message simultaneously by two looped network interface.By above-mentioned design, the described data of transmitting in the ring-shaped redundant network all are two parts of redundant each other messages, and independently transmit on the circuit mutually at two.
Shown in Fig. 2 a and 2b, in the ring-shaped redundant network that present embodiment provides, when circuit between place's ordinary node or the circuit between bridge and the ordinary node broke down, whole network became oriented linear topology, but still can proper communication.Simultaneously, this fault can feed back to the node that all initiate inspection of line request message.
Arbitrary ordinary node or bridge in the above-mentioned ring-shaped redundant network when one of them network interface or looped network interface are received message, if need to transmit through judging, are transmitted from another network interface or looped network interface immediately.For preventing to form network storm in the ring-shaped redundant network, when receiving the message that oneself sends, do not transmit each node.
In addition, the bridge that present embodiment provides realizes the function of ordinary node in the ring-shaped redundant network, message is sent from two looped network interfaces that connect other nodes, and end it when receiving this message next time.Simultaneously described bridge also is used to realize the data communication of ring-shaped redundant network internal and outside miscellaneous equipment, and promptly the outer network interface of described bridge is connected to described ring-shaped redundant network equipment interface in addition, is used for communicating by letter of ring-shaped redundant network and outer net.Bridge receives the message that ring-shaped redundant network equipment in addition sends by outer network interface, and judge whether this message needs to transmit in the ring-shaped redundant network, if then bridge is transmitted this redundant each other message by the first looped network interface and the second looped network interface in the ring-shaped redundant network.Bridge E-Packets if desired, need judge also whether the message that will send is to be transmitted to the message of ring-shaped redundant network with external equipment before then transmitting, if the outer network interface that then passes through this bridge is to the ring-shaped redundant network described message of device forwards in addition.
In the above-mentioned ring-shaped redundant network, each bridge and ordinary node all comprise a communication mode control module, this module can be by method settings such as configurations, switch the communication mode between each node, the concrete timesharing adopted mechanism, master-slave mode mechanism or the mechanism communication that both combine.
When adopting timesharing mechanism, need the transmitting time sheet of each node of configuration, guarantee that the transmitting time sheet between the node is not overlapping.Each ordinary node and bridge are carried out clock synchronization according to the IEEE1588 agreement, adopt defined boundary clock model, end-to-end transparent clock model or peer-to-peer transparent clock model among the IEEE1588.
When adopting master-slave mode mechanism, need to set an ordinary node or bridge is a host node, the transmission message that host node can be initiatively, host node allows to send message commands to sending from node simultaneously, to control the message sending order in the ring-like redundant network.
When timesharing mechanism and master-slave mode mechanism combine, when each node is distributed the transmitting time groove, specifying some ordinary nodes or bridge is host node, each node sends message in the time slot of oneself, and in all unappropriated time slot of all nodes, by the sending order of host node control message.
In the redundant network system that present embodiment provides, the data of transmitting in the ring-shaped redundant network all are two parts of redundant each other messages, and independently transmit on the circuit mutually at two, so any one circuit is when breaking down, this ring-shaped redundant network system still can proper communication; If a plurality of nodes (non-host node) that have only place's node (non-host node) to break down or break down are adjacent, so still can proper communication between other nodes.When this redundant network system is applicable in the real-time ethernet, its failure rate be can significantly reduce, its redundancy and availability improved.
Embodiment two:
Corresponding to the redundant network system that the foregoing description provides, the embodiment of the invention also provides a kind of redundant implementation method that is applicable to this system, and this method comprises:
Node sends redundant each other message simultaneously by two interfaces that are connected with other nodes in the ring-shaped redundant network, and receives the message in the ring-shaped redundant network;
Node judges whether the message that receives is the unicast message of issuing this node, if then need not to transmit this message, otherwise enter next step;
Node judges whether the message that receives is the message that this node self sends, if, then need not to transmit this message, otherwise, transmit this message to another network interface or the looped network interface of this node.
Schematic flow sheet as shown in Figure 3, this method comprises:
Step S301, a side network interface or the looped network interface of ordinary node or bridge receive message;
Step S302 judges whether the message that receives is the unicast message of issuing this node, if, execution in step S303, otherwise execution in step S304;
Step S303 does not transmit described message, process ends;
Step S304 judges whether the message that receives is the message that this node self sends, if, execution in step S305, otherwise execution in step S306;
Step S305 does not transmit described message, process ends;
Step S306 transmits this message to another network interface or the looped network interface of this node.
Said method provides the intrasystem redundant implementation method of redundant network that is applicable to that embodiment one provides, the data of transmitting in the ring-shaped redundant network all are two parts of redundant each other messages, and independently transmit on the circuit mutually at two, therefore its failure rate be can significantly reduce, its redundancy and availability improved.Simultaneously, node is not transmitted the message that himself sends, and is promptly taken on by sending node self by node, therefore can stop the generation of network storm.
Said method is applicable to the communication in the ring-shaped redundant network, and in addition, this ring-shaped redundant network can also send data to outer net by the bridge that is connected with outer net, and its implementation is as follows:
Before bridge is E-Packeting, also comprise:
Whether the message that judgement will send is to be transmitted to the message of ring-shaped redundant network with external equipment, if the outer network interface that then passes through this bridge is to the ring-shaped redundant network described message of device forwards in addition.
Accordingly, described ring-shaped redundant network can also receive the outer net data by the bridge that is connected with outer net, and transmits in the ring-shaped redundant network, and its implementation is as follows:
Step 1: bridge receives the message that ring-shaped redundant network equipment in addition sends by outer network interface, and judges whether this message needs to transmit in the ring-shaped redundant network, if then carry out next step;
Step 2: bridge is transmitted this redundant each other message by the first looped network interface and the second looped network interface in the ring-shaped redundant network.
Concrete, the communication mode between ring-shaped redundant network and the outer net is: when having message need send to equipment outside the ring-shaped redundant network in the ring-shaped redundant network, bridge is accepted this message, and sends by its outer network interface.When having message will send to device node in the ring-shaped redundant network outside the ring-shaped redundant network, bridge is accepted this message, again the message that sends for oneself of encapsulated message, perhaps some characteristics of recorded message, as source address etc., make bridge to prevent the network storm in the ring-shaped redundant network as the node that ends of this message.At this moment, in the ring-shaped redundant network internal, bridge realizes the function of ordinary node, this message is sent from two looped network interfaces that connect ordinary node, and end it when receiving this message next time.
The interior redundant implementation method of above-mentioned redundant network system can also be divided into two parts according to node type:
Ordinary node when ordinary node need send message, sends redundant each other message simultaneously by two network interface.After an interface of common network node receives message, can only transmit to another network interface of this node.An ordinary node when receiving the unicast message that sends to it, does not need to transmit; When receiving the message that self sends, do not need to transmit; When receiving other messages, need to transmit.
Need distinguish when bridge, bridge send message and in the ring-shaped redundant network, send or send to outer net.When in the ring-shaped redundant network, sending, send redundant each other message by its two looped network interfaces that are connected with ordinary node; When outer net sends, send by its looped network interface.When bridge is received message in the ring-shaped redundant network, need need judge whether to transmit (unicast message whether, the message that whether self sends), if transmit, need to judge that being transmitted to outer net equipment still is other interior nodes of ring-shaped redundant network, and transmit by corresponding looped network interface or outer network interface.When bridge is received the message of outer net, need need judge whether to transmit,, then transmit redundant each other messages by two looped network interfaces that it is connected with ordinary node if be transmitted to the interior node of ring-shaped redundant network.The workflow of bridge specifically can be referring to schematic flow sheet as shown in Figure 4.
In the above-mentioned ring-shaped redundant network, each bridge and ordinary node all comprise a communication mode control module, this module can be by method settings such as configurations, switch the communication mode between each node, the concrete timesharing adopted mechanism, master-slave mode mechanism or the mechanism communication that both combine.
Wherein, this ring-shaped redundant network can be realized the communication of master-slave mode mechanism by the following method:
At first, ordinary node or the bridge set in the ring-shaped redundant network are host node, and all the other nodes are from node; Has only the transmission message that host node can be initiatively;
Host node allows to send message commands to sending from node, to control the message sending order of all nodes.Only receive permission that host node sends when sending message commands from node, could send message.
Simultaneously, this ring-shaped redundant network can be realized the communication of timesharing mechanism by the following method:
At first, set ring-shaped redundant network using tdm communication mechanism, for each ordinary node distributes different transmitting time grooves with bridge; Can not be overlapping between the described time slot, concrete distribution can be disposed as required by user oneself, also can be distributed automatically by related management equipment when device power.
Each ordinary node and bridge can only send corresponding message in the time slot that self is assigned to.
When adopting the dispatching communication of timesharing mechanism, each ordinary node and bridge are carried out clock synchronization according to the IEEE1588 agreement, adopt defined boundary clock model, end-to-end transparent clock model or peer-to-peer transparent clock model among the IEEE1588.
During the dispatching communication of timesharing mechanism, need the transmitting time groove of each node of configuration, not overlapping for guaranteeing the transmitting time groove between the node, all nodes are based on the common clock work after synchronously, and therefore, described redundant implementation method can also comprise:
Ordinary node or the bridge set in the ring-shaped redundant network are in the master clock state, as the clock source of other nodes in this ring-shaped redundant network; Other all nodes in this ring-shaped redundant network are all synchronous with this master clock.
As the node of master clock, can be certain node of appointment, when certain node was designated as master clock, other nodes can only be as from clock; Master clock also can be produced by competition between all nodes in the ring-shaped redundant network, and the competition of master clock continues, and is served as by the node that meets most certain specified conditions in the ring-shaped redundant network all the time.
The quantity of node can be adjusted according to demand in real time in the redundant network that the embodiment of the invention provides, and therefore, when inserting new ordinary node or bridge in the described ring-shaped redundant network, at first itself and master clock will be carried out time synchronized; After the success, the new node that inserts could send corresponding message in the time slot that self is assigned to synchronously.
In addition, in the redundant implementation method that present embodiment provides, can also adopt master-slave mode to communicate by letter with the mechanism that the timesharing scheduling combines, concrete implementation is:
Ordinary node or the bridge set in the ring-shaped redundant network are host node, and all the other nodes be from node, are the different transmitting time groove of each ordinary node and bridge distribution simultaneously;
Each ordinary node and bridge send corresponding message in the time slot that self is assigned to, in all unappropriated time slot of all nodes, host node allows to send message commands to sending from node, controls the message sending order of all nodes.
Adopt machine-processed realization of Communication mode that master-slave mode and timesharing scheduling combines to communicate by letter and communicate by letter describedly with the timesharing scheduling mechanism, do not repeat them here referring to above-mentioned master-slave mode mechanism.
Availability for the described redundant network of further raising system, when fault takes place, locate timely and fix a breakdown, in the redundant implementation method that present embodiment provides, can also comprise described ring-shaped redundant network is carried out fault location that this concrete redundancy implementation method also comprises:
Step 1: each node in the ring-shaped redundant network periodically transmitting line is checked request message;
Step 2: each node is after receiving inspection of line request message, and transmitting line is checked response message;
Step 3: the initiation node receiving lines of inspection of line request message is checked response message and is write down its sending node, is used for judging the type and the position of ring-shaped redundant network fault.
In the said method, the node and the cycle of transmitting line inspection request message can be adjusted.If certain node is received at the opposite side interface of this node at the inspection of line request message that a side interface sends, this ring-shaped redundant network operate as normal then is described.Judgement to fault type in the ring-shaped redundant network can comprise following two kinds of situations:
One: if each interface of the initiation node A of inspection of line request message does not all receive the inspection of line response message of Node B feedback, then the circuit of predicate node B cisco unity malfunction or two interfaces of connected node B all has fault.
Two: if the interface A1 of the initiation node A of inspection of line request message receives the inspection of line response message of Node B feedback, another interface A2 does not receive the inspection of line response message of Node B feedback, then judges the cable fault that is connected with interface A2.Node B is in normal operating conditions as can be known simultaneously.
In the redundant implementation method that present embodiment provides, all redundancy works of treatment can be handled by the Redundancy Management entity of application layer, the user are hidden fully the existence of redundant network.In the processing procedure of redundant message, need not revise the message format of real-time ethernet message, need not increase the message flag section of distinguishing redundant message.By inspection of line mechanism, can in time find and repair the fault in the network.The ring-shaped redundant network internal can communicate by the equipment of bridge and outer net.The quantity of ring-shaped redundant network node can be adjusted according to demand in real time, and does not influence the communication of whole network.
When a place line fault was arranged in the ring-shaped redundant network, whole network still can keep proper communication, and had zero failure recovery time.The a plurality of nodes that one place's node failure arranged in network or break down are adjacent, and other nodes still can keep proper communication.The failure rate of real-time ethernet be can effectively reduce, its redundancy and availability improved.
Various piece adopts the mode of going forward one by one to describe in this specification, and what each part stressed all is and the difference of other parts that identical similar part is mutually referring to getting final product between the various piece.To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments.Therefore, the present invention will can not be restricted to embodiment illustrated herein, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (17)
1. a redundant network system is characterized in that, comprising:
Be no less than a bridge and be no less than two ordinary nodes;
Described ordinary node comprises first network interface and second network interface, and described first network interface is identical with the physical address of second network interface, and both logical addresses are identical;
Described bridge comprises the first looped network interface, the second looped network interface and outer network interface, and the described first looped network interface is identical with the physical address of the second looped network interface, and both logical addresses are identical; The physical address of described outer network interface and logical address are all different with the physical address and the logical address of the first looped network interface or the second looped network interface;
The first looped network interface of first network interface of described ordinary node and second network interface and bridge is connected successively with the second looped network interface, constitutes the ring-shaped redundant network.
2. redundant network according to claim 1 system is characterized in that:
The outer network interface of described bridge is connected to the equipment interface beyond the described ring-shaped redundant network, is used for communicating by letter of ring-shaped redundant network and outer net.
3. redundant network according to claim 1 system is characterized in that:
Comprise the communication mode control module in each node of described ring-shaped redundant network, be used to be provided with and switch the communication mode of each node, make it adopt timesharing mechanism, master-slave mode mechanism or mode that both combine to communicate.
4. redundant network according to claim 1 system is characterized in that:
During described ring-shaped redundant network using master-slave mode communication mechanism, wherein having and only have an ordinary node or bridge is host node, and described host node is used for controlling the sending order of each node message of this network.
5. redundant implementation method is applied to it is characterized in that in the redundant network as claimed in claim 1 system, comprising:
Node sends redundant each other message simultaneously by two interfaces that are connected with other nodes in the ring-shaped redundant network, and receives the message in the ring-shaped redundant network;
Node judges whether the message that receives is the unicast message of issuing this node, if then need not to transmit this message, otherwise enter next step;
Node judges whether the message that receives is the message that this node self sends, if, then need not to transmit this message, otherwise, transmit this message to another network interface or the looped network interface of this node.
6. redundant implementation method according to claim 5 is characterized in that, bridge also comprised before E-Packeting:
Whether the message that judgement will send is to be transmitted to the message of ring-shaped redundant network with external equipment, if the outer network interface that then passes through this bridge is to the ring-shaped redundant network described message of device forwards in addition.
7. redundant implementation method according to claim 5 is characterized in that, also comprises:
Bridge receives the message that ring-shaped redundant network equipment in addition sends by outer network interface, and judges whether this message needs to transmit in the ring-shaped redundant network, if then carry out next step;
Bridge is transmitted this redundant each other message by the first looped network interface and the second looped network interface in the ring-shaped redundant network.
8. redundant implementation method according to claim 5 is characterized in that, also comprises:
Ordinary node or the bridge set in the ring-shaped redundant network are host node, and all the other nodes are from node;
Host node allows to send message commands to sending from node, to control the message sending order of all nodes.
9. redundant implementation method according to claim 5 is characterized in that, also comprises:
Set ring-shaped redundant network using tdm communication mechanism, for each ordinary node distributes different transmitting time grooves with bridge;
Each ordinary node and bridge send corresponding message in the time slot that self is assigned to.
10. redundant implementation method according to claim 9 is characterized in that:
Each ordinary node and bridge are carried out clock synchronization according to the IEEE1588 agreement, adopt defined boundary clock model, end-to-end transparent clock model or peer-to-peer transparent clock model among the IEEE1588.
11. redundant implementation method according to claim 10 is characterized in that, also comprises:
Ordinary node or the bridge set in the ring-shaped redundant network are in the master clock state, as the clock source of other nodes in this ring-shaped redundant network;
Other all nodes in this ring-shaped redundant network are all synchronous with this master clock.
12. redundant implementation method according to claim 11 is characterized in that:
The master clock node is the node of user's appointment, or the node that is produced by all node sustainable competition in the ring-shaped redundant network.
13. redundant implementation method according to claim 11 is characterized in that, also comprises:
When inserting new ordinary node or bridge in the described ring-shaped redundant network, itself and master clock are carried out clock synchronization;
After the success, the new node that inserts sends corresponding message in the time slot that self is assigned to synchronously.
14. redundant implementation method according to claim 5 is characterized in that, also comprises:
Ordinary node or the bridge set in the ring-shaped redundant network are host node, and all the other nodes be from node, are the different transmitting time groove of each ordinary node and bridge distribution simultaneously;
Each ordinary node and bridge send corresponding message in the time slot that self is assigned to, in all unappropriated time slot of all nodes, host node allows to send message commands to sending from node, controls the message sending order of all nodes.
15. redundant implementation method according to claim 5 is characterized in that, also comprises:
Each node in the ring-shaped redundant network periodically transmitting line is checked request message;
Each node is after receiving inspection of line request message, and transmitting line is checked response message;
The initiation node receiving lines of inspection of line request message is checked response message and is write down its sending node, is used for judging the type and the position of ring-shaped redundant network fault.
16. redundant implementation method according to claim 15 is characterized in that:
If each interface of the initiation node of inspection of line request message does not all receive the inspection of line response message of a certain node feedback, the circuit of then judging this node cisco unity malfunction or connecting two interfaces of this node all has fault.
17. redundant implementation method according to claim 15 is characterized in that:
If first network interface of the initiation node of inspection of line request message or the first looped network interface receive the inspection of line response message of node feedback, second network interface or the second looped network interface do not receive the inspection of line response message of this node feedback, then judge the cable fault that is connected with second network interface or the second looped network interface.
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