CN101483570B - Method, system and device for preventing looped network temporary loop circuit of relaying link - Google Patents
Method, system and device for preventing looped network temporary loop circuit of relaying link Download PDFInfo
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- CN101483570B CN101483570B CN2009100090990A CN200910009099A CN101483570B CN 101483570 B CN101483570 B CN 101483570B CN 2009100090990 A CN2009100090990 A CN 2009100090990A CN 200910009099 A CN200910009099 A CN 200910009099A CN 101483570 B CN101483570 B CN 101483570B
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Abstract
The invention discloses a looped network temporary looping method for preventing relay link. The method comprises steps that a main switch and a transport switch sends relay-link-probe messages from a sending port to the receiving port directly connected with the transport switch through a repeater; if the main switch or the receiving port directly connected with the transport switch does not receive relay-link-probe messages, the receiving port is blocked, and when the receiving port belongs to the transport switch, relay-link-down messages are sent from the sending port to the main switch. According to the invention, in the looped network of a relay link, whether relay-link-probe messages are over time or not is detected to determine whether the corresponding receiving port is closed or not, therefore, when some link is fault and then returns to normal, a temporary looping will not occur; when the fault link returns to normal, by using the looped network protocol, the closed port is opened or is opened within a time threshold, the looped network protocol performance can be improved, and problems of flow transport occurring when the relay looped network is fault can be solved.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of looped network temporary looping method, system and equipment that prevents repeated link.
Background technology
When ethernet ring network is complete, can prevent the broadcast storm that data loopback causes through the hello testing mechanism.When a link breaks off on the ethernet ring network; Can recover the communication path between each equipment: EAPS (Ethernet Automatic Protection Switching rapidly through following agreement; The exchange of ether network automatic protection) agreement, RRPP (Rapid Ring Protection Protocol, rapid ring protection protocol) etc.Send a hello probe messages such as the core switch A in Fig. 1 networking from the P1 port, receive this hello probe messages, explain that looped network is complete from the P2 port, thus Block (obstruction) P2 port, blocking-up broadcasting loop.When the P2 port can not receive the hello probe messages within a certain period of time; Perhaps received the link failure message that miscellaneous equipment initiatively reports; Core switch A knows that looped network is imperfect, needs to decontrol the P2 port that blocks, and makes data to continue to accomplish through backup path from the P2 port and transmits.
In the actual networking, potential range is far between the networking equipment (like core switch), and the core switch intermediate demand increases repeater, and is as shown in Figure 2.Wherein, repeater can be one, also can be for a plurality of.Repeated link possibly break down; For example, fault has appearred in the link between repeater 1 and the repeater 2, and is as shown in Figure 3; The P2 port of core switch A can not receive the hello probe messages at certain hour; Perhaps received the link failure message that miscellaneous equipment initiatively reports, decontroled the P2 port that blocks, made data to transmit through backup link from the P2 port.
Yet; After the repeated link fault restoration; Core switch A and adjacent core switch B can not perceive link-recovery immediately, therefore before the P2 of core switch A port is received the hello probe messages and then blocked this port, can form temporary loop on the looped network; As shown in Figure 4, cause in the repeated link looped network data to repeat to send at both direction.
Summary of the invention
The invention provides a kind of looped network temporary looping method, system and equipment that prevents repeated link, to realize existing the defencive function of repeated link looped network.
The invention provides a kind of looped network temporary looping method that prevents repeated link, be applied to comprise that said method comprises in the main looped network with switch, transmission switching mechanism and repeater:
Said main with switch and transmission switching mechanism from transmit port through said repeater to direct-connected transmission switching mechanism or lead receiving port transmission repeated link detection messages with switch; Said master does not receive said repeated link detection messages with the receiving port of switch or said direct-connected transmission switching mechanism in Preset Time; Block said receiving port; And when said receiving port belongs to transmission switching mechanism, send repeated link fault message to said master with switch from transmit port; During said direct-connected transmission switching mechanism barrage reception port; The receiving port of said transmission switching mechanism receives that said master recovers message with switch from the looped network that transmit port sends; Or after receiving the repeated link detection messages, surpass threshold value blanking time, decontrols the receiving port of said obstruction; Wherein, said master also comprises with after the switch barrage reception port, said main relaying UNICOM state with switch said receiving port of inspection before decontroling receiving port; If UNICOM not; Do not decontrol said receiving port, if UNICOM decontrols said receiving port.
Preferably, said master also comprises with after the switch barrage reception port:
When the relaying UNICOM state of said receiving port is not during UNICOM, said master sends other switch of mac refresh message notifying looped network with switch and refreshes MAC address entries.
Preferably, for two up links, also comprise after the said barrage reception port:
The corresponding MAC address entries of said transmission switching mechanism deletion active link, the corresponding MAC address entries of study reserve link makes flow switch to backup link.
Preferably, saidly flow is switched to also comprise after the backup link:
After active link recovered, transmission switching mechanism received that looped network recovers message, the corresponding MAC address entries of deletion reserve link.
The invention provides a kind of system that prevents the looped network temporary looping of repeated link, comprise the master with switch, transmission switching mechanism and repeater,
Said main with switch and transmission switching mechanism; Be used for through said repeater to direct-connected transmission or the main said transmission switching mechanism of receiving port transmission repeated link detection messages with switch; Be used in Preset Time, not receiving said repeated link detection messages; Block said receiving port, and when receiving port belongs to said transmission switching mechanism, send repeated link fault message to said master with switch from the transmit port of said transmission switching mechanism; And the master uses or the process of transmission switching mechanism transmission repeated link detection messages, does not receive the repeated link fault effects; Receive said master and recover message from the looped network that transmit port sends, or after receiving the repeated link detection messages, surpass threshold value blanking time with switch; Decontrol the receiving port of said obstruction, wherein, the master also comprises with after the switch barrage reception port; Saidly main before decontroling receiving port, check the relaying UNICOM state of said receiving port, if UNICOM does not decontrol said receiving port with switch; If UNICOM decontrols said receiving port;
Wherein, said switch is when leading with switch or transmission switching mechanism, also to comprise:
Transmitting element is used for from transmit port through said repeater to direct-connected transmission switching mechanism or main receiving port transmission repeated link detection messages with switch.
The invention provides a kind of switch, comprising:
Detecting unit is used for receiving the repeated link detection messages through repeater, and detects in Preset Time, whether to receive the repeated link detection messages; When the barrage reception port, detect in Preset Time, whether to receive looped network recovery message;
The port controlling unit when being used for said detection and in Preset Time, not receiving the repeated link detection messages, blocks said receiving port, and sends repeated link fault message through transmit port; Recover message in said detection to arriving looped network, or after receiving the repeated link detection messages, decontrol the receiving port of said obstruction when surpassing threshold value blanking time;
The link detecting unit is used to check the relaying UNICOM state of said receiving port, if UNICOM not notifies said port controlling unit not decontrol said receiving port, if UNICOM notifies said port controlling unit to decontrol said receiving port; Or detecting current looped network when complete, repeated link notifies said port controlling unit not decontrol said receiving port after recovering.。
Preferably, for two up links, also comprise:
The list item administrative unit is used for after the barrage reception port, the corresponding MAC address entries of deletion active link, and the corresponding MAC address entries of study reserve link makes flow switch to backup link; And after active link recovered, transmission switching mechanism received that looped network recovers message, the corresponding MAC address entries of deletion reserve link.
Preferably, said switch is to lead when using switch, also comprises:
Refresh unit, when being used for relaying UNICOM state when said receiving port and being not UNICOM, other switch that sends in the mac refresh message notifying looped network refreshes MAC address entries.
Compared with prior art, the present invention has the following advantages:
Among the present invention, whether overtime through detecting the repeated link detection messages in the looped network of repeated link, close corresponding receiving port with decision, make after some link breaks down and recovers normally, can not produce temporary loop; And when receiving looped network recovery message or detect relaying recovery back timer expiry, open pent port guarantees that looped network can the normal transmission message.In addition; When having two backup of uplink in the looped network of relaying link, if the repeated link fault, also could whether overtime through detecting the repeated link detection messages; Close corresponding up active link corresponding port, guarantee that service traffics move to up backup link.
Description of drawings
Fig. 1 is the looped network agreement sketch map that the hello bag detects in the prior art;
There is the repeated link sketch map in Fig. 2 in the looped network in the prior art;
Fig. 3 is a repeated link fault sketch map in the prior art;
Fig. 4 is that the repeated link reparation forms the temporary loop sketch map in the prior art;
Fig. 5 is a kind of looped network temporary looping method flow chart that prevents repeated link among the present invention;
Fig. 6 is the connective sketch map of surveying of repeated link among the present invention;
Fig. 7 is that the repeated link fault is blocked the connectivity port sketch map among the present invention;
Fig. 8 is that there are two up link sketch mapes in the core switch b among the present invention;
Fig. 9 is among the present invention behind the primary link failure, and flow is moved to the backup link sketch map;
Figure 10 is a kind of switch architecture figure among the present invention.
Embodiment
Core concept of the present invention is: switch in looped network (main with switch and transmission switching mechanism) all disposes a repeated link detection messages receiving port and transmit port; Through transmit port switch transmission downstream repeated link detection messages, receive repeated link detection messages from looped network through receiving port; When receiving port does not receive the repeated link detection messages within a certain period of time, then block this receiving port; Recover message when receiving port receives looped network within a certain period of time, or after receiving the repeated link detection messages, surpass threshold value blanking time, decontrol the receiving port that gets clogged.
The invention provides a kind of looped network temporary looping method that prevents repeated link, be applied to comprise that this method is as shown in Figure 5, may further comprise the steps in the main looped network with switch, transmission switching mechanism and repeater:
Wherein, the master also comprises with after the switch barrage reception port: it is imperfect that said master detects looped network with switch, the relaying UNICOM state of the said receiving port of inspection before decontroling receiving port; If UNICOM not; Do not decontrol said receiving port, if UNICOM decontrols said receiving port; When the relaying UNICOM state of said receiving port is not during UNICOM, said master sends other switch of mac refresh message notifying looped network with switch and refreshes MAC address entries.
For two up links, also comprise after the said barrage reception port: the corresponding MAC address entries of said transmission switching mechanism deletion active link, the corresponding MAC address entries of study reserve link makes flow switch to backup link.After active link recovered, transmission switching mechanism received that looped network recovers message, the corresponding MAC address entries of deletion reserve link, and the corresponding MAC address entries of study active link makes flow switch to active link.
In the networking shown in Figure 6; Core switch A is that Master switch, core switch B and core switch C are the Transit switches; Wherein, The Master switch is used for looped network to be surveyed, and the topology information of initiating after change in topology renewal and operation exchange etc., and the Transit switch is used for operation exchange.The P1 port of core switch A, core switch B and core switch C is a receiving port, and the P2 port is a transmit port.Every switch is all pressed fixed distance time (hello timer) switch transmission downstream Relay-link-probe (repeated link detection) message in the looped network.Core switch A sends repeated link probe messages through repeater 1 and repeater 2 to the P1 of core switch B port from the P2 port; Core switch B sends repeated link probe messages through repeater 3 and repeater 4 to the P1 of core switch C port from the P2 port, and core switch C sends repeated link probe messages through repeater 5 and repeater 6 to the P1 of core switch A port from the P2 port.
Wherein, After the P1 port of core switch B is received the Relay-link-probe message from the P2 port transmission of core switch A; Open timer; Time-out time T1=3*hello timer (blanking time) is set, if do not receive the Relay-link-probe message behind the timer expired once more, then Block (obstruction) receives the P1 port of Relay-link-probe message; Send Relay-link-down (repeated link fault) message from P2 and pass through core switch C, and core switch B is unaffected to core switch C transmission Relay-link-probe message again to core switch A.Certainly, above-mentioned time-out time only to be 3 times of blanking times that example describes, also can be worth for other in the practical application.
When being received the Relay-link-probe message once more by the P1 port of the reception Relay-link-probe message of Block among the core switch B; Opening timing device T2; In the T2 time range, (it can be two blanking times; Also can be more blanking time), if receiving the looped network that core switch A sends, the P1 port among the core switch B recovers message, then receiving the P1 port of decontroling Block constantly; Still can not receive the looped network recovery message that core switch A sends if surpass the T2 time, also decontrol the P1 port of Block.
As shown in Figure 7, core switch A is the Master switch of looped network, according to the looped network agreement, when the looped network operate as normal, blocks redundant P1 port.Three place's repeated links in the looped network are fault successively, can see that core switch B can fall the P1 port by Block, and core switch C can fall the P1 port by Block, and core switch A should fall the P1 port by Block.Here there is a sequence problem; If it is imperfect that core switch A detects looped network earlier through looped network agreement (hello probe messages), decontrol the original P1 port that blocks, detect then between repeater 5 and the repeater 6 and break down; Block falls the P1 port, and then the P1 port is in the Block state; If core switch A detects fault between repeater 5 and the repeater 6 earlier, block the P1 port, the back is imperfect to looped network through the looped network protocol detection, decontrols the P1 port that blocks, and the P1 port is in forwarding state like this.Therefore need do to replenish for the P1 port of core switch A and handle: before confirming to need to decontrol the P1 port through the looped network protocol detection, the relaying UNICOM state of inspection P1 port is not if Fault just decontrols the P1 port that Block falls; Refresh the MAC address entries of oneself but still need send other switch of MAC (Media Access Control, medium access control) update notice looped network, because two layer services are transmitted business through MAC; Select the path mainly to depend on the relation of the correspondence table of MAC and port; Therefore, in ethernet ring network, when normal route breaks down; The forwarding-table item of two layer services need refresh into the corresponding relation of MAC and new port to the corresponding relation of MAC and old port.Among the present invention, when normal route breaks down in the ethernet ring network, all need send other switch of mac refresh message notifying looped network and refresh the MAC address entries of oneself.
Among Fig. 7; The repeated link reparation of fault is repaired earlier such as the link between repeater 1 and the repeater 2, and the P1 port of core switch B can be received the Relay-link-probe message that core switch A sends; Start timer, wait overtime back of T2 time to decontrol the P1 port of Block.If then be the link-recovery UNICOM between repeater 5 and the repeater 6, the port P1 of core switch A can receive the Relay-link-probe message that core switch B sends, and starts timer, waits for overtime back relieving of T2 time port P1.At this moment, because the link between repeater 3 and the repeater 4 does not have UNICOM,, the port P1 of core switch A can not produce temporary loop even decontroling yet.
If but repeater 3 recovers (Block port processing procedure is with core switch B) earlier with repeater 4 links; Recover behind the link between repeater 5 and the repeater 6; Can receive the Relay-link-probe message that itself sends as the P1 port of the core switch A of looped network agreement Master equipment, therefore, the P1 port of core switch A is handled and is had sequence problem; Complete such as detecting looped network in advance owing to the looped network agreement; Be provided with the Block state of P1 port, at this moment decontrol the P1 port of Block, can produce temporary loop because receiving the Relay-link-probe message.Therefore also need do to replenish for the P1 port of the core switch A of the Master equipment of looped network agreement and handle: complete if core switch A detects current looped network through the hello probe messages, after recovering, repeated link do not decontrol the Block port detecting.
The present invention can also be applied on the two backup of uplink that have repeated link; As shown in Figure 8; Following the hanging of core switch B fully can be through core switch C and core switch A visit external business; Wherein core switch B 1 is an active link to core switch A to repeater 2 to repeater, and 3 is backup link to repeater 4 to core switch C from core switch B to repeater.If the link between repeater 5 and the repeater 6 breaks off earlier; Thereafter the link between repeater 1 and the repeater 2 also breaks off, and is as shown in Figure 9, the Master device core switch A of looped network agreement; Can can't not send the local MAC table of message notifying core switch B renewal of the equipment yet; Therefore, the uplink traffic of core switch B still is forwarded on the former active link, and can't transmit through backup link.
Among the present invention; Use the P1 port of core switch B can not receive that in the given time core switch A sends the Relay-link-probe message from active link; Then by Block; With the MAC information deletion of active link in the MAC address entries, the MAC information of study reserve link is equipped with through backup link from core switch C visit external business following the hanging of core switch B.After active link recovers; Core switch B receives that the looped network that core switch A sends recovers message; Then decontrol by the P1 port of Block, recover the MAC address entries of original active link, following the hanging of core switch B is equipped with through backup link from core switch A visit external business.
The invention provides a kind of system that prevents the looped network temporary looping of repeated link, comprise main with switch, transmission switching mechanism and repeater.Wherein, said main using and transmission switching mechanism is used for sending the repeated link detection messages through said repeater to the receiving port of said transmission switching mechanism; Said transmission switching mechanism; Be used for through said repeater to direct-connected transmission switching mechanism or main receiving port transmission repeated link detection messages with switch; In Preset Time, do not receive the repeated link detection messages that said master sends with switch or direct-connected transmission switching mechanism; Block said receiving port, and send repeated link fault message to said master with switch from the transmit port of said transmission switching mechanism; After detecting the relaying fault recovery, in Preset Time, receive said master and recover message from the looped network that transmit port sends, or after receiving the repeated link detection messages, surpass threshold value blanking time, decontrols the receiving port of said obstruction with switch.
The invention provides a kind of switch, shown in figure 10, comprising: detecting unit 1010 is used for receiving the repeated link detection messages through repeater, and detects in Preset Time, whether to receive the repeated link detection messages; When the barrage reception port, detect in Preset Time, whether to receive looped network recovery message; Port controlling unit 1020 is used for detecting unit 1010 and detects when not receiving the repeated link detection messages in the Preset Time, blocks said receiving port, and sends repeated link fault message through transmit port.Detect at detecting unit 1010 and to receive looped network in the Preset Time and recover message, or after detecting the repeated link detection messages, decontrol the receiving port of said obstruction when surpassing threshold value blanking time.
In addition, for two up links, switch also comprises:
List item administrative unit 1030 is used for after the barrage reception port, the corresponding MAC list item of deletion active link, and the corresponding MAC address entries of study reserve link makes flow switch to backup link; And after active link recovered, transmission switching mechanism received that looped network recovers message, the corresponding MAC address entries of deletion reserve link, and the corresponding MAC address entries of study active link makes flow switch to active link.
Switch also comprises:
Through the description of above execution mode, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding; The part that technical scheme of the present invention contributes to prior art in essence in other words can be come out with the embodied of software product; This computer software product is stored in the storage medium; Comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
More than disclosedly be merely several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (8)
1. a looped network temporary looping method that prevents repeated link is applied to comprise in the main looped network with switch, transmission switching mechanism and repeater, it is characterized in that said method comprises:
Said main with switch and transmission switching mechanism from transmit port through said repeater to direct-connected transmission switching mechanism or lead receiving port transmission repeated link detection messages with switch;
Said master does not receive said repeated link detection messages with the receiving port of switch or said direct-connected transmission switching mechanism in Preset Time; Block said receiving port; And when said receiving port belongs to transmission switching mechanism, send repeated link fault message to said master with switch from transmit port;
During said direct-connected transmission switching mechanism barrage reception port; The receiving port of said transmission switching mechanism receives said master and recovers message with switch from the looped network that transmit port sends in Preset Time; Or after receiving said repeated link detection messages; Surpass threshold value blanking time, decontrols the receiving port of said obstruction;
Wherein, said master also comprises with after the switch barrage reception port, said main relaying UNICOM state with switch said receiving port of inspection before decontroling receiving port; If UNICOM not; Do not decontrol said receiving port, if UNICOM decontrols said receiving port.
2. the method for claim 1 is characterized in that, said master also comprises with after the switch barrage reception port:
When the relaying UNICOM state of said receiving port is not during UNICOM, said master sends other switch of mac refresh message notifying looped network with switch and refreshes MAC address entries.
3. the method for claim 1 is characterized in that, for two up links, also comprises after the said barrage reception port:
The corresponding MAC address entries of said transmission switching mechanism deletion active link, the corresponding MAC address entries of study reserve link makes flow switch to backup link.
4. method as claimed in claim 3 is characterized in that, saidly flow is switched to also comprise after the backup link:
After active link recovered, transmission switching mechanism received that looped network recovers message, the corresponding MAC address entries of deletion reserve link, and the corresponding MAC address entries of study active link makes flow switch to active link.
5. a system that prevents the looped network temporary looping of repeated link comprises that the master with switch, transmission switching mechanism and repeater, is characterized in that,
The said main switch of using; Be used for through said repeater to said transmission or main receiving port transmission repeated link detection messages with switch; Said main receiving port with switch does not receive said repeated link detection messages in Preset Time, block said receiving port;
Wherein, said master also comprises with after the switch barrage reception port, said main relaying UNICOM state with switch said receiving port of inspection before decontroling receiving port; If UNICOM not; Do not decontrol said receiving port, if UNICOM decontrols said receiving port;
Said transmission switching mechanism; Be used for through said repeater to direct-connected transmission switching mechanism or main receiving port transmission repeated link detection messages with switch; In Preset Time, do not receive the repeated link detection messages that said master sends with switch or direct-connected transmission switching mechanism; Block said receiving port, and send repeated link fault message to said master with switch from the transmit port of said transmission switching mechanism; In Preset Time, receive said master and recover message from the looped network that transmit port sends, or after receiving the repeated link detection messages, surpass threshold value blanking time, decontrols the receiving port of said obstruction with switch.
6. a switch is characterized in that, comprising:
Detecting unit is used for receiving the repeated link detection messages through repeater, and detects in Preset Time, whether to receive the repeated link detection messages; When the barrage reception port, detect in Preset Time, whether to receive looped network recovery message;
The port controlling unit when being used for said detection and in Preset Time, not receiving the repeated link detection messages, blocks said receiving port, and sends repeated link fault message through transmit port; Recover message in said detection to looped network, or after detecting the repeated link detection messages, decontrol the receiving port of said obstruction when surpassing threshold value blanking time;
The link detecting unit; The relaying UNICOM state that is used for the said receiving port of inspection before decontroling receiving port is if UNICOM not notifies said port controlling unit not decontrol said receiving port; If UNICOM notifies said port controlling unit to decontrol said receiving port; Or detecting current looped network when complete, repeated link notifies said port controlling unit not decontrol said receiving port after recovering;
Wherein, said switch is when leading with switch or transmission switching mechanism, also to comprise:
Transmitting element is used for from transmit port through said repeater to direct-connected transmission switching mechanism or main receiving port transmission repeated link detection messages with switch.
7. switch as claimed in claim 6 is characterized in that, for two up links, also comprises:
The list item administrative unit is used to block after the said receiving port, the corresponding MAC address entries of deletion active link, and the corresponding MAC address entries of study reserve link makes flow switch to backup link.
8. switch as claimed in claim 6 is characterized in that, said switch is to lead when using switch, also comprises:
Refresh unit, when being used for relaying UNICOM state when said receiving port and being not UNICOM, other switch that sends in the mac refresh message notifying looped network refreshes MAC address entries.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100090990A CN101483570B (en) | 2009-02-17 | 2009-02-17 | Method, system and device for preventing looped network temporary loop circuit of relaying link |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100090990A CN101483570B (en) | 2009-02-17 | 2009-02-17 | Method, system and device for preventing looped network temporary loop circuit of relaying link |
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| CN101483570A CN101483570A (en) | 2009-07-15 |
| CN101483570B true CN101483570B (en) | 2012-07-11 |
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| CN2009100090990A Expired - Fee Related CN101483570B (en) | 2009-02-17 | 2009-02-17 | Method, system and device for preventing looped network temporary loop circuit of relaying link |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101945050B (en) * | 2010-09-25 | 2014-03-26 | 中国科学院计算技术研究所 | Dynamic fault tolerance method and system based on fat tree structure |
| CN102868605B (en) * | 2012-09-05 | 2016-02-03 | 浙江宇视科技有限公司 | A kind of looped network data guard method and device |
| KR20150093648A (en) * | 2012-09-27 | 2015-08-18 | 휴렛-팩커드 디벨롭먼트 컴퍼니, 엘.피. | Transmit specific traffic along blocked link |
| CN103227753B (en) * | 2013-04-01 | 2016-01-06 | 北京东土科技股份有限公司 | A kind of network congestion processing method, system and device |
| CN103457792B (en) * | 2013-08-19 | 2017-02-08 | 大唐移动通信设备有限公司 | Fault detection method and fault detection device |
| CN103701654A (en) * | 2014-01-07 | 2014-04-02 | 深圳市振兴伟业通讯有限公司 | Network topological system and control method and device thereof |
| CN106470153B (en) * | 2016-09-05 | 2019-12-06 | 杭州迪普科技股份有限公司 | method and device for preventing temporary loop |
| CN107733980B (en) * | 2017-09-11 | 2021-01-26 | 深圳市盛路物联通讯技术有限公司 | Internet of things data transmission system based on ring network and first repeater |
| CN107579896B (en) * | 2017-09-11 | 2021-01-26 | 深圳市盛路物联通讯技术有限公司 | Internet of things data transmission method based on ring network and storage medium |
| CN107580056B (en) * | 2017-09-12 | 2020-07-24 | 深圳市盛路物联通讯技术有限公司 | Internet of things communication method and internet of things gateway |
| CN110868407B (en) * | 2019-11-06 | 2022-05-17 | 成都卫士通信息产业股份有限公司 | Ethernet link detection method, device, electronic equipment and computer medium |
| CN111294238B (en) * | 2020-01-22 | 2022-04-22 | 中国人民解放军61623部队 | Method and system for automatically judging total service resistance between exchanges |
| CN113709068B (en) * | 2021-08-26 | 2023-08-15 | 北京东土科技股份有限公司 | Switch system and execution processing method of switch |
| CN114584456A (en) * | 2022-03-16 | 2022-06-03 | 上海泗博自动化技术有限公司 | Fault alarm method and device for ring network redundant switch |
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