CN104135417A - Quick recovery method for ethernet ring network link interruption and corresponding ethernet ring network - Google Patents
Quick recovery method for ethernet ring network link interruption and corresponding ethernet ring network Download PDFInfo
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Abstract
The invention provides a quick recovery method for ethernet ring network link interruption and a corresponding ethernet ring network. The ethernet ring network comprises a main unit device and a plurality of subset unit devices. The quick recovery method comprises the steps that the main unit device periodically sends detection messages; whether all links on the ethernet ring network are in the connected state or not is judged according to the transmission state of the detection messages; when transmission link interruption exists on the ethernet ring network, the ethernet ring network is made to be in the protection switching state; when transmission link interruption is recovered, the transmission link which exists before interruption is recovered based on notification messages sent by the main unit device. According to the quick recovery method for the ethernet ring network link interruption and the corresponding ethernet ring network, the corresponding interruption recovery scheme is provided for single-point one-way interruption and multi-point interruption, rapid recovery can be achieved for ethernet ring network link interruption, communication between ring network unit devices is rapidly recovered, and broadcast storm caused by a data loop is prevented.
Description
Technical field
The present invention relates to the communications field, more specifically, relate to method and the corresponding ethernet ring network of the fast quick-recovery of a kind of ethernet ring network link down.
Background technology
Along with reliability, real-time and the protective capability requirement of industrial environment to industrial control network is more and more higher, Industrial Ethernet extensively adopts annular networking to improve network reliability.The conventional looped network protection agreement that is applicable to looped network interruption and recover has STP, RSTP, RPR etc.The convergence time of STP and RSTP is long, complicated along with the increase of nodes and topology, if particularly run into the situation that multiple spot interrupts, convergence time further increases, and cannot reach the convergence rate requirement of telecom carrier-class device on convergence time; RPR needs hardware supports, and cost is higher.
Summary of the invention
For the above-mentioned defect of prior art, the present invention proposes a kind of method and corresponding ethernet ring network of the fast quick-recovery of ethernet ring network link down that is applied to link layer, the present invention can be for ethernet ring network link down, be switched to rapidly backup link, make recovery communication service rapidly between the each unit of looped network, the present invention utilizes a special control channel transmission ring net control information in looped network, while is in conjunction with the topological feature of looped network itself, in the time that breaking down, realizes on network quick discovery and the recovery of fault, single-point for ethernet ring network interrupts, the unidirectional interruption of single-point and multiple spot interrupt all can realizing efficient, respond fast and recover.
The method of the fast quick-recovery of ethernet ring network link down of the present invention, it is characterized in that, described ethernet ring network comprises a master unit equipment and several subset units, described master unit equipment and subset unit have respectively the first looped network port and the second looped network port, said method comprising the steps of:
The first looped network port of described master unit equipment is set to forward mode, and the second looped network port is set to listen mode; The first and second looped network ports of each subset unit are all made as to forward mode;
At master unit equipment and subset unit configuration address and port mapping table respectively;
Between master unit equipment and subset unit, set up special logic passage;
Described master unit equipment periodic ground sends detecting message by described the first looped network port on described special logic passage, and monitors described detecting message by described the second looped network port;
According to the transmission state of described detecting message, judge on ethernet ring network that whether all links are in connected state;
On ethernet ring network, all links are under connected state, and described master unit equipment keeps the listen mode of the second looped network port;
While existing transmission link to interrupt on ethernet ring network, the subset unit adjacent with the transmission link interrupting sends fault message by described special logic passage, and the first or second looped network port corresponding with the transmission link interrupting switched to listen mode; Described master unit equipment switches to forward mode according to fault message by described the second looped network port;
In the time that transmission link interrupts recovering, the subset unit adjacent with the transmission link recovering sends fault recovery message by described special logic passage, described master unit equipment switches to listening state by described the second looped network port again according to described fault recovery message, and sends notice message by described special logic passage; Described subset unit switches to forward mode according to described notice message by the first or second looped network port in listen mode.
Preferably, in the time that the transmission link interruption between subset unit causes the transmission of described detecting message to be blocked, the subset unit adjacent with the transmission link interrupting switches to interruption of work pattern immediately, thereby this subset unit interrupts ongoing work by described special logic passage transmission fault message under interruption of work pattern.
Further preferably, the subset unit that transmission link described and interruption is adjacent first sends the described fault message of predetermined quantity fast continuously, then fault message described in periodicity slow transmission.
Further preferably, described master unit equipment and subset unit are being made after response for described fault message, and the follow-up fault message of receiving is no longer responded.
Further preferably, when the second looped network port of described master unit equipment is not received the detecting message being sent by the first looped network port of this master unit equipment at the appointed time, described master unit equipment judges and on ethernet ring network, exists transmission link to interrupt, and described the second looped network port is switched to forward mode.
Further preferably, in the time that transmission link interrupts all keeping recovering in scheduled duration, the subset unit adjacent with the transmission link interrupting sends described fault recovery message.
Further preferably, described master unit equipment, after receiving described fault recovery message, through after scheduled duration, switches to listening state by described the second looped network port again, and sends notice message by described special logic passage.
Preferably, described subset unit and master unit equipment are being received the operation of carrying out refresh address and port mapping table after described fault message; And described subset unit is being received the operation of carrying out refresh address and port mapping table after described notice message.
Preferably, when one-way transmission interruption from the first subset unit to the second adjacent subset unit occurs transmission link on ethernet ring network, the first or the second corresponding transmission link interrupting with this one-way transmission looped network port is switched to listen mode by described the second subset unit; And in the time that this one-way transmission interrupts recovering, described the second subset unit sends fault recovery message by described special logic passage, and described the second subset unit, in the case of the notice message of receiving master unit equipment, switches to forward mode by the first or second looped network port in listen mode.
Preferably, when multiple transmission links on ethernet ring network occur to interrupt, the subset unit adjacent with the transmission link interrupting sends fault message by described special logic passage, and the first or second looped network port corresponding with the transmission link interrupting switched to listen mode; When after at least one recovery in described multiple transmission links, the subset unit that the described transmission link with recovering is adjacent sends fault recovery message by described special logic passage; The subset unit adjacent with the transmission link of described interruption do not change the pattern of its first or second looped network port after receiving the described fault recovery message that other subset unit sends, and continues to send described fault message; The subset unit adjacent with the transmission link recovering received after the fault message of other subset unit transmission, the first or second looped network port in listen mode switched to forward mode, and no longer send any message.
The present invention further provides a kind of ethernet ring network of realizing the fast quick-recovery of link down, it is characterized in that, described ethernet ring network comprises a master unit equipment and several subset units, described master unit equipment and several subset units are connected to looped network by transmission link, described master unit equipment and subset unit have respectively the first looped network port and the second looped network port, and master unit equipment and subset unit be configuration address and port mapping table respectively; Between master unit equipment and subset unit, set up special logic passage;
And the first looped network port of described master unit equipment is set to forward mode under normal condition, the second looped network port is set to listen mode; The first and second looped network ports of each subset unit are all made as forward mode;
Described master unit equipment sends detecting message for periodically passing through described the first looped network port on described special logic passage, and monitors described detecting message by described the second looped network port; And judging on ethernet ring network that according to the transmission state of described detecting message whether all links are in connected state;
Described master unit equipment keeps the listen mode of the second looped network port under connected state for all links on ethernet ring network; In the time receiving the fault message of subset unit, according to fault message, described the second looped network port is switched to forward mode; In the time receiving the fault recovery message that subset unit sends, again described the second looped network port is switched to listening state according to described fault recovery message, and send notice message by described special logic passage;
Described subset unit is used for sending fault message by described special logic passage in the time that adjacent transmission link interrupts, and the first or second looped network port corresponding with the transmission link interrupting switched to listen mode; In the time that interrupting recovering, adjacent transmission link sends fault recovery message by described special logic passage; According to described notice message, the first or second looped network port in listen mode is switched to forward mode.
Preferably, in the time that the transmission link interruption between subset unit causes the transmission of described detecting message to be blocked, the subset unit adjacent with the transmission link interrupting is for switching to immediately interruption of work pattern, thereby this subset unit interrupts ongoing work by described special logic passage transmission fault message under interruption of work pattern.
Further preferably, the subset unit that transmission link described and interruption is adjacent first sends the described fault message of predetermined quantity fast continuously, then fault message described in periodicity slow transmission.
Further preferably, described master unit equipment and subset unit are being made after response for described fault message, and the follow-up fault message of receiving is no longer responded.
Further preferably, when the second looped network port of described master unit equipment is not received the detecting message being sent by the first looped network port of this master unit equipment at the appointed time, described master unit equipment judges and on ethernet ring network, exists transmission link to interrupt, and described the second looped network port is switched to forward mode.
Preferably, in the time that transmission link interrupts all keeping recovering in scheduled duration, the subset unit adjacent with the transmission link interrupting sends described fault recovery message.
Further preferably, described master unit equipment, after receiving described fault recovery message, through after scheduled duration, switches to listening state by described the second looped network port again, and sends notice message by described special logic passage.
Described subset unit and master unit equipment are being received the operation of carrying out refresh address and port mapping table after described fault message; And described subset unit is being received the operation of carrying out refresh address and port mapping table after described notice message.
Preferably, when one-way transmission interruption from the first subset unit to the second adjacent subset unit occurs transmission link on ethernet ring network, the first or the second corresponding transmission link interrupting with this one-way transmission looped network port is switched to listen mode by described the second subset unit; And in the time that this one-way transmission interrupts recovering, described the second subset unit sends fault recovery message by described special logic passage, and described the second subset unit, in the case of the notice message of receiving master unit equipment, switches to forward mode by the first or second looped network port in listen mode.
Preferably, when multiple transmission links on ethernet ring network occur to interrupt, the subset unit adjacent with the transmission link interrupting sends fault message by described special logic passage, and the first or second looped network port corresponding with the transmission link interrupting switched to listen mode; When after at least one recovery in described multiple transmission links, the subset unit that the described transmission link with recovering is adjacent sends fault recovery message by described special logic passage; The subset unit adjacent with the transmission link of described interruption do not change the pattern of its first or second looped network port after receiving the described fault recovery message that other subset unit sends, and continues to send described fault message; The subset unit adjacent with the transmission link recovering received after the fault message of other subset unit transmission, the first or second looped network port in listen mode switched to forward mode, and no longer send any message.
Visible, the present invention is a kind of method of the link layer that is specifically applied to Ethernet ring, in the time of Ethernet ring uplink or device fails, can be switched to rapidly backup link, ensures the fast quick-recovery of business.The present invention utilizes a special control channel transmission ring net control information in looped network, while is in conjunction with the topological feature of looped network itself, in the time that breaking down, network can find fast, thereby and enable backup link and accomplish fast quick-recovery, for the single-point of ethernet ring network interrupt, the unidirectional interruption of single-point and multiple spot interrupt all can realizing efficiently, responding fast and recover.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:
Fig. 1 is the ethernet ring network of the embodiment of the present invention schematic diagram under normal condition;
Fig. 2 is that the ethernet ring network of the embodiment of the present invention is protected the schematic diagram under switching state when interruption occurs transmission link somewhere;
Fig. 3 is that the ethernet ring network of the embodiment of the present invention interrupts the schematic diagram under returning to form at transmission link;
Fig. 4 is the ethernet ring network of the embodiment of the present invention schematic diagram under the unidirectional interrupt status of single-point;
Fig. 5 is the ethernet ring network of the embodiment of the present invention schematic diagram under the unidirectional interruption of single-point returns to form;
Fig. 6 is that the ethernet ring network of the embodiment of the present invention interrupts the schematic diagram under returning to form at multiple spot.
Embodiment
In order to make those skilled in the art person understand better technical scheme of the present invention, and above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with embodiment and embodiment accompanying drawing, the present invention is further detailed explanation.
The present invention has built the ethernet ring network being made up of multiple units, and sets one of them unit as master unit equipment, and remaining element equipment is as subset unit.As shown in Figure 1, unit A is as described master unit equipment, and remaining element equipment B, C, D, E and F are as described subset unit.Described master unit device A and subset unit B-F are connected to looped network by transmission link.In the middle of looped network connects, each unit has the first looped network port and the second looped network port totally two ports, connects respectively the transmission link adjacent with each unit.The operating state of looped network port comprises forward mode and listen mode, under forward mode, the message that unit is received the first looped network port (or second looped network port) is forwarded to the second looped network port (or first looped network port), realizes the forwarding of message on the transmission link adjacent with unit; In the time that looped network port is under listen mode, the message that unit blocks this looped network port sends, but can pass through this looped network port receipt message.In order to realize the transmitting-receiving of message, at master unit equipment and subset unit configuration address and port mapping table respectively; And, between master unit equipment and subset unit, set up special logic passage, this special logic passage is specifically designed to realizes the transmitting-receiving that ethernet ring network interruption recovers related news.
Under the normal condition shown in Fig. 1, the transmission link between described master unit device A and adjacent subset unit F is as reserve link RPL.In order to prevent that the data message on ethernet ring network from forming broadcast loop, the second looped network port that this reserve link of master unit device A RPL is adjacent is set to listen mode, and the first looped network port of master unit device A opposite side is set to forwarding state.And the first and second looped network ports of subset unit B-F are all set to forward mode.Master unit device A can periodically send detecting message CCM by described the first looped network port on special logic passage, because all links under normal condition are all communicated with, can pass through successively each subset unit from the CCM of master unit device A, finally get back to master unit device A by the second looped network port of master unit device A; Because the second looped network port is in listening state, can listen to this detecting message CCM.Thereby master unit device A can be according to the above-mentioned transmission state of this CCM, judge that all links on ethernet ring network are all in normal connected state.
Fig. 2 is that the ethernet ring network of the embodiment of the present invention is protected the schematic diagram under switching state when interruption occurs transmission link somewhere.As shown in Figure 2, transmission link between subset unit C, D interrupts, cause the transmission of described CCM to be blocked, at this moment subset unit C, the D adjacent with the transmission link interrupting switches to interruption of work state immediately, interrupt ongoing work, and send fault message SF to each unit of looped network by described special logic passage respectively.In the situation that this transmission link keeps interrupt status, subset unit C and D send this fault message constantly.The concrete grammar that subset unit C and D send fault message is: first send continuously fast two fault messages, and then periodicity slow transmission fault message, the first two fault message guarantees that each unit can both receive fault message, thereby normally switches while ensureing link failure; Send continuously afterwards periodic fault message, object is to continue notice master unit device link fault message, makes looped network enter protection switching state.Meanwhile, subset unit C and D also switch to listen mode by the looped network port adjacent with the transmission link interrupting respectively, and refresh himself address and port mapping table.Described fault message SF is sent to other subset unit and master unit equipment along normal link.Other subset unit of receiving this message SF carries out address and port mapping table refreshes.Master unit device A is received after this message SF, immediately the second looped network port is switched to forward mode, removes the blocked state of reserve link RPL, then refresh address and port mapping table.Then; ethernet ring network enters protection switching state; on this ethernet ring network, consecutive periods ground sends fault message, and makes after response for described fault message at master unit equipment and subset unit, receives that new fault message no longer triggers these units and makes new behavior.In above-mentioned steps, refresh address and port mapping table are for fear of directed mistake, due to ethernet ring network link failure, cause network topology structure to change, and therefore need according to message message refresh address and port mapping table, avoid the directed mistake of message.
Described master unit device A also has the looped network state-detection mechanism of self, in the time that the second looped network port of master unit device A is not received the detecting message CCM that the first looped network port of master unit equipment sends at the appointed time in (can by this stipulated time of a set timer), also think that looped network interrupts.Now the processing procedure during with above-mentioned subset unit active reporting outage is identical to the processing procedure of this outage for ethernet ring network.
Fig. 3 is that the ethernet ring network of the embodiment of the present invention interrupts the schematic diagram under returning to form at transmission link.In the time that the link down between subset unit C and D is recovered, the subset unit C adjacent with the transmission link interrupting and D monitor and interrupt recovering, and start corresponding protection timer.In the scheduled duration of setting at described protection timer, transmission link keeps returning to form, and described subset unit C and D periodically send fault recovery message SF, so that notice master unit device A.Master unit device A is received after fault recovery message SF, start corresponding timer, after scheduled duration makes this timer expiry, master unit device A switches to listening state by described the second looped network port again, and send notice message by described dedicated logical channel, notify all subset unit refresh addresses and port mapping table, and master unit device A refreshes self address and port mapping table.Described subset unit is after receiving the notice message that master unit device A sends, and all refresh address and port mapping tables again, so that the transmission link before recovering to interrupt.The subset unit C adjacent with the transmission link interrupting and D switch to forward mode by the looped network port in listen mode, and again refresh self address and port mapping table after receiving the notice message of master unit device A transmission.Thereby, complete the recovery to the transmission link before interrupting.
Introduce the quick recovery process in ethernet ring network transmission link interruption situation above.The transmission link of ethernet ring network interrupts also comprising that one-way transmission is interrupted and multiple spot interrupts situation.Below the interruption under both of these case is recovered to be introduced.
Fig. 4 is the ethernet ring network of the embodiment of the present invention schematic diagram under the unidirectional interrupt status of single-point.Under the state of the unidirectional interruption of single-point, interrupted to the transmission link of subset unit C by subset unit D, and normal to the transmission link of subset unit D by subset unit C.At this moment, subset unit C has detected that the transmission link between itself and subset unit D is abnormal, and the looped network port that subset unit C handle is adjacent with this transmission link switches to listen mode; According to the similar step of introducing above, subset unit C periodically sends fault message to other unit.After other subset unit in looped network is received this fault message, refresh address and port mapping table.Master unit device A switches to forward mode the state of the second looped network port after receiving this fault message.
Fig. 5 is the ethernet ring network of the embodiment of the present invention schematic diagram under the unidirectional interruption of single-point returns to form.At subset unit D, after the transmission link of subset unit C recovers, subset unit C detects that in scheduled duration link-local keeps recovering, and sends fault recovery message to other unit.Described master unit device A is received after this fault recovery message, utilizes timer through after scheduled duration, and the second looped network port is switched to listening state, and sends notice message to the subset unit of looped network; Each subset unit is according to notice message refresh address and port mapping table; Subset unit C switches back forward mode according to notice message the looped network port that switches to before listen mode.
Fig. 6 is that the ethernet ring network of the embodiment of the present invention interrupts the schematic diagram under returning to form at multiple spot.Transmission link in Fig. 6 between unit C and D and E and F all interrupts, in have no progeny the processing procedure of each subset unit and master unit device A with before introduce step identical, the subset unit adjacent with the transmission link interrupting sends fault message by described special logic passage, and the first or second looped network port corresponding with the transmission link interrupting switched to listen mode.Afterwards, the transmission link between E and F recovers, but between C and D, transmission link still interrupts.Subset unit E and the F adjacent with the transmission link recovering send fault recovery message by described special logic passage, and subset unit C and D still periodically send fault message.Subset unit C and D receive after the described fault recovery message that other subset unit E and F send, and because self adjacent transmission link still interrupts, therefore do not change the pattern of its first or second looped network port, and continue to send described fault message.Subset unit E and F receive after the fault message of subset unit C and D transmission, immediately the first or second looped network port in listen mode are switched to forward mode, and no longer send any other message.Until the transmission link between subset unit C and D in scheduled duration, keep recover after, subset unit C and D also send fault recovery message, master unit device A is received after fault recovery message, passes through scheduled time length by timer, then sends notice message.Subset unit C and D, according to described notice message, switch to forward mode by the first or second looped network port in listen mode.Each unit, equally according to the mode of introducing, is carried out refresh address and port mapping table handling above.
By said method, this method, detecting when Link State, is swift in response, and can experience extremely short detection time and accurately locates all link down points.Can make to recover rapidly communication between the each unit of looped network, possess shorter turnaround time, realize the highly reliable redundant system of carrier-class.
The above, be only the specific embodiment of the present invention, and the present invention can also be applied in miscellaneous equipment; Size and quantity in more than describing are only all informative, and those skilled in the art can select suitable application size according to actual needs, and do not depart from the scope of the present invention.Protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in, the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range that claim was defined.
Claims (10)
1. the method for the fast quick-recovery of ethernet ring network link down, it is characterized in that, described ethernet ring network comprises a master unit equipment and several subset units, described master unit equipment and subset unit have respectively the first looped network port and the second looped network port, said method comprising the steps of:
The first looped network port of described master unit equipment is set to forward mode, and the second looped network port is set to listen mode; The first and second looped network ports of each subset unit are all made as to forward mode;
At master unit equipment and subset unit configuration address and port mapping table respectively;
Between master unit equipment and subset unit, set up special logic passage;
Described master unit equipment periodic ground sends detecting message by described the first looped network port on described special logic passage, and monitors described detecting message by described the second looped network port;
According to the transmission state of described detecting message, judge on ethernet ring network that whether all links are in connected state;
On ethernet ring network, all links are under connected state, and described master unit equipment keeps the listen mode of the second looped network port;
While existing transmission link to interrupt on ethernet ring network, the subset unit adjacent with the transmission link interrupting sends fault message by described special logic passage, and the first or second looped network port corresponding with the transmission link interrupting switched to listen mode; Described master unit equipment switches to forward mode according to fault message by described the second looped network port;
In the time that transmission link interrupts recovering, the subset unit adjacent with the transmission link recovering sends fault recovery message by described special logic passage, described master unit equipment switches to listening state by described the second looped network port again according to described fault recovery message, and sends notice message by described special logic passage; Described subset unit switches to forward mode according to described notice message by the first or second looped network port in listen mode.
2. the method for the fast quick-recovery of ethernet ring network link down according to claim 1, it is characterized in that, in the time that the transmission link interruption between subset unit causes the transmission of described detecting message to be blocked, the subset unit adjacent with the transmission link interrupting switches to interruption of work pattern immediately, thereby this subset unit interrupts ongoing work by described special logic passage transmission fault message under interruption of work pattern.
3. the method for the fast quick-recovery of ethernet ring network link down according to claim 1, it is characterized in that, the subset unit that transmission link described and interruption is adjacent first sends the described fault message of predetermined quantity fast continuously, then fault message described in periodicity slow transmission.
4. the method for the fast quick-recovery of ethernet ring network link down according to claim 3, is characterized in that, described master unit equipment and subset unit are being made after response for described fault message, and the follow-up fault message of receiving is no longer responded.
5. the method for the fast quick-recovery of ethernet ring network link down according to claim 1, it is characterized in that, judge according to the transmission state of described detecting message on ethernet ring network, whether all links comprise in the step of connected state: when the second looped network port of described master unit equipment is not received the detecting message being sent by the first looped network port of this master unit equipment at the appointed time, described master unit equipment judges and on ethernet ring network, exists transmission link to interrupt, and described the second looped network port is switched to forward mode.
6. the method for the fast quick-recovery of ethernet ring network link down according to claim 1, is characterized in that, in the time that transmission link interrupts all keeping recovering in scheduled duration, the subset unit adjacent with the transmission link interrupting sends described fault recovery message.
7. the method for the fast quick-recovery of ethernet ring network link down according to claim 1, it is characterized in that, described master unit equipment is after receiving described fault recovery message, after process scheduled duration, again described the second looped network port is switched to listening state, and send notice message by described special logic passage.
8. the method for the fast quick-recovery of ethernet ring network link down according to claim 1, is characterized in that, described subset unit and master unit equipment are being received the operation of carrying out refresh address and port mapping table after described fault message; And described subset unit is being received the operation of carrying out refresh address and port mapping table after described notice message.
9. the method for the fast quick-recovery of ethernet ring network link down according to claim 1, it is characterized in that, when one-way transmission interruption from the first subset unit to the second adjacent subset unit occurs transmission link on ethernet ring network, the first or the second corresponding transmission link interrupting with this one-way transmission looped network port is switched to listen mode by described the second subset unit; And in the time that this one-way transmission interrupts recovering, described the second subset unit sends fault recovery message by described special logic passage, and described the second subset unit, in the case of the notice message of receiving master unit equipment, switches to forward mode by the first or second looped network port in listen mode.
10. the method for the fast quick-recovery of ethernet ring network link down according to claim 1, it is characterized in that, when multiple transmission links on ethernet ring network occur to interrupt, the subset unit adjacent with the transmission link interrupting sends fault message by described special logic passage, and the first or second looped network port corresponding with the transmission link interrupting switched to listen mode; When after at least one recovery in described multiple transmission links, the subset unit that the described transmission link with recovering is adjacent sends fault recovery message by described special logic passage; The subset unit adjacent with the transmission link of described interruption do not change the pattern of its first or second looped network port after receiving the described fault recovery message that other subset unit sends, and continues to send described fault message; The subset unit adjacent with the transmission link recovering received after the fault message of other subset unit transmission, the first or second looped network port in listen mode switched to forward mode, and no longer send any message.
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| CN109525445A (en) * | 2018-12-29 | 2019-03-26 | 北京东土军悦科技有限公司 | Link switch-over method, link redundancy backup network and computer readable storage medium |
| CN111416750A (en) * | 2020-05-14 | 2020-07-14 | 贵州省交通规划勘察设计研究院股份有限公司 | Fault monitoring system and monitoring method of single-network-line Ethernet ring network |
| CN111698157A (en) * | 2020-07-23 | 2020-09-22 | 迈普通信技术股份有限公司 | Link management method, board card and switch |
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| CN109120521B (en) * | 2017-06-26 | 2022-01-25 | 中兴通讯股份有限公司 | Path switching method of annular stacking system, first stacking equipment and second stacking equipment |
| CN109525445A (en) * | 2018-12-29 | 2019-03-26 | 北京东土军悦科技有限公司 | Link switch-over method, link redundancy backup network and computer readable storage medium |
| CN109525445B (en) * | 2018-12-29 | 2022-03-08 | 北京东土军悦科技有限公司 | Link switching method, link redundancy backup network and computer readable storage medium |
| CN111416750A (en) * | 2020-05-14 | 2020-07-14 | 贵州省交通规划勘察设计研究院股份有限公司 | Fault monitoring system and monitoring method of single-network-line Ethernet ring network |
| CN111698157A (en) * | 2020-07-23 | 2020-09-22 | 迈普通信技术股份有限公司 | Link management method, board card and switch |
| CN111698157B (en) * | 2020-07-23 | 2022-05-24 | 迈普通信技术股份有限公司 | Link management method, board card and switch |
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| CN104135417B (en) | 2018-09-11 |
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