CN101184013A - Method for preventing generation of loop, host node and system - Google Patents
Method for preventing generation of loop, host node and system Download PDFInfo
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- CN101184013A CN101184013A CNA2007101794484A CN200710179448A CN101184013A CN 101184013 A CN101184013 A CN 101184013A CN A2007101794484 A CNA2007101794484 A CN A2007101794484A CN 200710179448 A CN200710179448 A CN 200710179448A CN 101184013 A CN101184013 A CN 101184013A
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Abstract
The invention discloses a method to avoid the occurrence of routing loop, which comprises: the major node of ethernet ring network transmits complete detection message from both primary port and secondary port, and the major node puts the secondary port in blocking state if the complete detection message can be received only at primary port or secondary port. Simultaneously, the invention also discloses a major node and the system to avoid the occurrence of routing loop. The invention has an advantage of avoiding the occurrence of routing loop when the ethernet ring network is in signal-pass failure state.
Description
Technical field
The present invention relates to the ethernet ring network technology, particularly relate to a kind of method, host node and system that avoids producing loop.
Background technology
Fig. 1 is the structural representation of single ethernet ring network.Referring to Fig. 1, in single ethernet ring network, comprise a host node and a plurality of transmission node, host node and each transmission node service data transmission on ethernet ring network are finished the miscellaneous service function.
Referring to Fig. 1, because ethernet ring network is a loop network structure, therefore, need prevent to produce loop, thus the broadcast storm of avoiding unknown unicast and broadcasting to be caused in loop cocycle transmission.Produce loop for fear of ethernet ring network, under normal condition, host node is only opened the master port of self side, and blocks the secondary port of self opposite side.Like this, when service data transmission, ethernet ring network then is a chain, and can not produce loop.
Host node need be responsible for the state of each transmission node and link on the ethernet ring network is monitored, to guarantee the ethernet ring network operate as normal.At present, the process that guarantees the ethernet ring network operate as normal comprises: host node periodically sends health detection message by master port, be commonly referred to the HELLO message, if host node can receive this HELLO message from the secondary port of self in continuous three cycles, so, host node determines that transmission nodes all on the current ethernet ring network and link are all normal, therefore, need not to carry out troubleshooting, promptly host node keeps master port to open and secondary port block; When looped network breaks down, the transmission node that perceives this fault can report the signalling trouble message to host node, after host node receives the signalling trouble message, judge that transmission node or link on the current ethernet ring network are unavailable, therefore, need carry out troubleshooting, i.e. host node open auxiliary port.
In the business realizing of reality, the ring network fault that has is not because link-state change causes, and at this moment the port status of each node does not change, so can't directly perception fault take place.At this moment, after host node periodically sends the HELLO message from master port, just can't in continuous three cycles of appointment, receive the HELLO message, come the perception ring network fault from secondary port.The reason that causes this kind situation may be the optical fiber link single-channel fault between two nodes in the ethernet ring network, also may make the exchange chip fault of certain intra-node.Both of these case all single-channel fault might occur.Single-channel fault is meant that the link of a direction is normal, the link failure of another direction in the two-way link between two nodes.Such as, referring to Fig. 2, in the two-way link between transmission node 2 and transmission node 3, forward link 1 breaks down, and reverse link 2 is normal (for ease of describing, in this article, forward is meant the direction that arrives secondary port from the master port of host node along looped network, oppositely be meant the direction that arrives master port from the secondary port of host node along looped network), at this moment, the ethernet ring network forward then occurred and opened circuit and the single-channel fault of backward channel, when host node when master port sends the HELLO message, then can't receive from secondary port.
Because in the prior art, as long as it is the HELLO message that host node does not receive the health detection message that self sends, will open Primary port and secondary port simultaneously, therefore, when single-channel fault takes place when, then can make ethernet ring network produce the loop of a direction, thereby unknown unicast can occur and broadcast the broadcast storm that is caused in this loop cocycle transmission.
Summary of the invention
The object of the present invention is to provide and a kind ofly avoid producing the method for loop, a kind of host node and a kind of system that avoids producing loop, so that avoid ethernet ring network to produce loop.
In order to achieve the above object, technical scheme of the present invention is achieved in that
A kind of method of avoiding producing loop, be applied to have the ethernet ring network of loop network structure, comprise host node in this Ethernet ring and more than one transmission node, host node and each transmission node service data transmission on ethernet ring network, finish the miscellaneous service function, and host node is responsible for the state of each transmission node and link on the ethernet ring network is monitored, and this method comprises:
Host node on the ethernet ring network sends health detection message on Primary port and secondary port, if only receive health detection message in Primary port and secondary port, and on another, do not receive health detection message, then host node makes secondary port be in blocked state.
A kind of host node, be arranged in ethernet ring network with loop network structure, comprise host node in this Ethernet ring and more than one transmission node, host node and each transmission node service data transmission on ethernet ring network, finish the miscellaneous service function, and host node is responsible for the state of each transmission node and link on the ethernet ring network is monitored, and comprising:
The loop detection unit is used for sending health detection message by Primary port and secondary port, receives health detection message if only detect in Primary port and secondary port, then sends congestion notification to secondary port controlling unit;
Secondary port controlling unit is used for after receiving congestion notification, makes secondary port be in blocked state.
A kind of system that avoids producing loop, this system comprise the host node that a plurality of transmission nodes and the present invention propose.
This shows, in the present invention, host node sends health detection message on two ports of Primary port and secondary port, like this, if only on a port, receive health detection message from another port, can determine that so then single-channel fault appears in ethernet ring network, and master port blocks secondary port.So then avoided when single-channel fault appears in ethernet ring network, producing the shortcoming of loop in the prior art, thus the broadcast storm of having avoided unknown unicast and broadcasting to be caused in loop cocycle transmission.
In addition, in the present invention, single-channel fault whether occurs, therefore, need not equipment is carried out complicated escalation process, be convenient to professional realization and popularization owing to utilized the health detection message of the existing protocol that equipment supports to detect ethernet ring network.
Description of drawings
Fig. 1 is the structural representation of single ethernet ring network.
Fig. 2 is the schematic diagram that single-channel fault appears in ethernet ring network.
Fig. 3 is a flow chart of avoiding producing loop in one embodiment of the invention.
Fig. 4 is the structural representation of the host node on the ethernet ring network in one embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with drawings and the specific embodiments.
The present invention proposes a kind of method of avoiding producing loop.In the method, the host node on the ethernet ring network sends health detection message on Primary port and secondary port, if only receive health detection message in Primary port and secondary port, then host node blocks secondary port.
Fig. 3 is a flow chart of avoiding producing loop in one embodiment of the invention.Referring to Fig. 3, in one embodiment of the invention, the process of avoiding producing loop specifically may further comprise the steps:
Step 301: when host node was in good working condition (COMPLETE STATE), host node blocked secondary port and periodically sends health detection message from master port.
In the prior art, for host node has defined good working condition, the processing of this step is identical with the respective process of prior art.
Need to prove, with identical in the prior art, in this flow process, in the initial operate as normal of ethernet ring network, be that host node is when being in good working condition, each transmission node can be monitored the state of ethernet ring network link, if it is after breakpoint appears in ethernet ring network that a transmission node monitors an adjacent link fault, then can send signalling trouble, after the host node that is in good working condition receives signalling trouble, can determine that opening circuit has appearred in ethernet ring network to host node, then can switch to the link failure state that has defined in the prior art, when switching to this state, host node open auxiliary port, and still periodically send health detection message from master port.
Step 302: when being in good working condition, host node judges whether and can receive health detection message from master port from secondary port, if, then return step 301, otherwise, execution in step 303.
Host node judges whether that the mode that can receive from the health detection message of master port from secondary port is: judge continuous a plurality of cycles as 3 cycles in, whether can receive health detection message from secondary port from master port.
In this step, host node can be determined the state of ethernet ring network forward link by judging whether and can receiving health detection message from master port from secondary port.In the time can not receiving, can determine that the ethernet ring network forward opens circuit, according to the processing mode of prior art, because host node is in good working condition, its secondary port gets clogged, and therefore in order to guarantee the transmission of follow-up business data, host node should the open auxiliary port.Yet in such cases, owing to only determined the ethernet ring network forward link and opened circuit, also do not determine the state of ethernet ring network reverse link, therefore, also need to carry out the processing (oppositely sending health detection message at once a time) of subsequent step, so that, determine whether the open auxiliary port according to the state of the ethernet ring network reverse link of determining.
In the time can receiving, can determine the ethernet ring network forward path, because current host node is in good working condition, its secondary port gets clogged, ethernet ring network can not produce loop, therefore, can return step 301 and continue to carry out the process that detects ethernet ring network forward link state.
Step 303: host node sends health detection message from secondary port, judges whether to receive health detection message from master port from secondary port, if then execution in step 304, otherwise, execution in step 307.
Judge whether can from master port receive from the mode of the health detection message of secondary port can for: judge in 1 cycle, whether receive health detection message from secondary port from master port., only judging the health detection message of whether receiving from secondary port herein in 1 cycle, is the number of times that detects for minimizing farthest, improves processing speed, thereby when single-channel fault takes place, can fast reaction.
In this step, host node can be determined the state of ethernet ring network reverse link by judging whether and can receiving health detection message from secondary port from master port.Because when carrying out this step, having determined the ethernet ring network forward link opens circuit, therefore, if on master port, can not receive health detection message from secondary port, be that ethernet ring network oppositely opens circuit, so, can determine that then breakpoint appears in ethernet ring network, in order to guarantee the transmission of follow-up business data, need to carry out the processing of host node open auxiliary port in the subsequent step 307; If on master port, can receive health detection message from secondary port, it is the ethernet ring network backward channel, so, can determine that then single-channel fault appears in ethernet ring network, can not carry out the processing of open auxiliary port in the prior art, otherwise, can cause the ethernet ring network reverse link to produce loop, therefore, continue execution in step 304.
Step 304: host node switches to predefined link single-pass state (SINGLE-PASSSTATE).
In the prior art, only above-mentioned good working condition and link failure state have been defined for host node.And,, can when host node be in good working condition, detect ethernet ring network whether single-channel fault takes place by the processing of above-mentioned steps 301 to step 303.Preferably, in order to guarantee that host node also can detect ethernet ring network in other cases whether single-channel fault takes place, in the present embodiment, for host node has defined link single-pass state in this step and the plooing fault state in the following step 307.
Step 305: when being in link single-pass state, host node blocks secondary port, and periodically sends health detection message respectively on Primary port and secondary port.
Step 306: when being in link single-pass state, host node judges whether and can receive health detection message from Primary port and secondary port respectively, if on Primary port and secondary port, all can receive health detection message, then switch to described good working condition, return step 301, if all do not receive health detection message on Primary port and secondary port, then execution in step 307, if only on of Primary port and secondary port, receive health detection message, then return step 305.
In above-mentioned steps 305 and step 306, when host node was in link single-pass state, host node need block secondary port, produced loop to avoid ethernet ring network.Preferably, when host node is in link single-pass state, host node also periodically sends health detection message respectively on Primary port and secondary port, be for when the forward link of ethernet ring network or reverse link change, can be in time whether the state of host node and secondary port be blocked and adjust.
If on Primary port and secondary port, all can receive health detection message, illustrate that so then ethernet ring network forward link and reverse link are path, ethernet ring network has returned to operate as normal, therefore, need switch to good working condition.If on Primary port and secondary port, all do not receive health detection message, so, illustrate that then breakpoint appears in ethernet ring network, in order to guarantee the transmission of follow-up business data, host node should be carried out the processing of host node open auxiliary port in the subsequent step.If only on of Primary port and secondary port, receive health detection message, illustrate that then still there is single-channel fault in ethernet ring network, that is to say that the current state of host node still is a link single-pass state, therefore, the processing in the time of should returning step 305 continuation execution link single-pass state.
Step 307: host node switches to predefined plooing fault state.
Step 308: when being in the plooing fault state, host node open auxiliary port, and on Primary port and secondary port, periodically send health detection message respectively.
Step 309: when being in the plooing fault state, host node judges whether and can receive health detection message from Primary port and secondary port respectively, if on Primary port and secondary port, all can receive health detection message, then switch to described good working condition, return step 301,, then return step 304 if only receive health detection message in Primary port and secondary port, if on Primary port and secondary port, all do not receive health detection message, then return step 308.
To step 309, when host node was in the plooing fault state, the ethernet ring network both direction all opened circuit in above-mentioned steps 307, and host node needs the open auxiliary port, to guarantee the transmission of business datum.Preferably, when host node is in the plooing fault state, host node also periodically sends health detection message respectively on Primary port and secondary port, be for after the forward link of ethernet ring network or reverse link change, can be in time whether the state of host node and secondary port be blocked and adjust.
If on Primary port and secondary port, all can receive health detection message, illustrate that so then ethernet ring network forward link and reverse link are path, ethernet ring network has returned to operate as normal, therefore, need switch to good working condition.If only on of Primary port and secondary port, receive health detection message, so, illustrate that then single-channel fault appears in ethernet ring network, need turn to the processing of avoiding ethernet ring network to produce loop in the execution in step 304.If on Primary port and secondary port, all do not receive health detection message, illustrate that then still there is plooing fault in ethernet ring network, that is to say that the current state of host node still is the plooing fault state, therefore, the processing in the time of should returning step 308 continuation execution plooing fault state.
Need to prove that above-mentioned flow process shown in Figure 3 is preferred embodiment of the present invention.It will be appreciated by those skilled in the art that, under host node can the situation of operate as normal, host node can need not be confined to the consideration of host node state and ethernet ring network Link State among above-mentioned Fig. 3, can carry out at any time and send health detection message on the Primary port and secondary port, judging whether only on a port, to receive the processing of health detection message, determine the single-channel fault of ethernet ring network, thereby make secondary port be in blocked state, avoid ethernet ring network to produce the processing of loop.Such as, detect the health detection message and open auxiliary port that is not receiving on the secondary port from master port at host node after, host node periodically sends health detection message respectively on Primary port and secondary port; If only receive health detection message on any one port, so, host node is carried out the processing of blocking secondary port.
Be understandable that,, should be pointed out that the strictness of restriction do not do to(for) the order of above-mentioned steps though in the foregoing description, for ease of understanding, the step of method has been adopted the succession description.
Those of ordinary skills it is also understood that, all or part of step in the foregoing description can instruct relevant hardware to realize by program, described program can be stored in the computer read/write memory medium, described storage medium can be ROM/RAM, magnetic disc, CD etc.
Correspondingly, the invention allows for a kind of host node.Fig. 4 is the structural representation of the host node on the ethernet ring network in one embodiment of the invention.Referring to Fig. 4, this host node comprises:
The loop detection unit is used for sending health detection message by Primary port and secondary port, receives health detection message if only detect in Primary port and secondary port, then sends congestion notification to secondary port controlling unit;
Secondary port controlling unit is used for after receiving congestion notification, blocks secondary port.
Preferably, the above-mentioned processing of described loop detection unit specifically can be: when switching to good working condition, notify secondary port controlling unit to block secondary port, and periodicity sends health detection message on master port, if on secondary port, do not receive health detection message from master port, then on secondary port, send health detection message, after the health detection message that receives on the master port from secondary port, carry out the described processing that sends congestion notification to secondary port controlling unit.
Preferably, described loop detection unit, be further used for when being in good working condition, if on secondary port, do not receive health detection message from master port, on master port, receive health detection message from secondary port, then switch to link single-pass state, after switching to link single-pass state, carry out the described processing that sends congestion notification to secondary port controlling unit, and further when being in link single-pass state, on Primary port and secondary port, periodically send health detection message respectively,, then switch to described good working condition if on Primary port and secondary port, all receive health detection message.
Preferably, described loop detection unit, be further used for when being in good working condition, if on Primary port and secondary port, all do not receive health detection message, then switch to the plooing fault state, after switching to the plooing fault state, notice is opened in transmission to secondary port controlling unit, and on Primary port and secondary port, periodically send health detection message respectively, if on Primary port and secondary port, all receive health detection message, then switch to described good working condition,, then switch to described link single-pass state if only receive health detection message in Primary port and secondary port;
Described secondary port controlling unit, be further used for receive open notice after, the open auxiliary port.
Preferably, described loop detection unit is further used for when being in link single-pass state, if all do not receive health detection message on Primary port and secondary port, then switches to described plooing fault state.
Preferably, described loop detection unit is used for periodically sending health detection message respectively on Primary port and secondary port after detecting the health detection message and open auxiliary port that is not receiving on the secondary port from master port.
Be understandable that, only be schematic in the accompanying drawing or shown in the embodiment, the presentation logic structure, the wherein said unit that shows as separating component may or may not be physically to separate, the parts that show as the unit may be or may not be physical locations, promptly can be positioned at a place, perhaps be distributed on several network element.
In addition, the invention allows for a kind of system that avoids producing loop.Comprise a plurality of transmission nodes and host node in this system, wherein, transmission node can adopt transmission node of the prior art to realize, host node can adopt any one host node that proposes in the above embodiment of the present invention to realize.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. method of avoiding producing loop, it is characterized in that, this method is applied to have the ethernet ring network of loop network structure, comprise host node in this Ethernet ring and more than one transmission node, host node and each transmission node service data transmission on ethernet ring network are finished the miscellaneous service function, and, host node is responsible for the state of each transmission node and link on the ethernet ring network is monitored, and comprising:
Host node on the ethernet ring network sends health detection message on Primary port and secondary port, if only receive health detection message in Primary port and secondary port, and on another, do not receive health detection message, then host node makes secondary port be in blocked state.
2. method according to claim 1, it is characterized in that, described host node sends health detection message on Primary port and secondary port step comprises: described host node is in good working condition, secondary port block, host node periodically sends health detection message on master port, if on secondary port, do not receive health detection message, then on secondary port, send health detection message from master port;
Receiving health detection message on described only in Primary port and secondary port is: do not receive the health detection message from master port on secondary port, receive the health detection message from secondary port on master port;
Described host node makes secondary port be in blocked state to comprise: host node keeps the blocked state of secondary port.
3. method according to claim 2, it is characterized in that, only receive after the health detection message in Primary port and secondary port, further comprise: described host node switches to predefined link single-pass state, host node periodically sends health detection message respectively on Primary port and secondary port, if on Primary port and secondary port, all receive health detection message, then switch to described good working condition.
4. method according to claim 3, it is characterized in that, this method further comprises: all do not receive health detection message if be in the described host node of good working condition on Primary port and secondary port, then described host node switches to predefined plooing fault state, the open auxiliary port, and on Primary port and secondary port, periodically send health detection message respectively, if on Primary port and secondary port, all receive health detection message, then switch to described good working condition, if only receive health detection message in Primary port and secondary port, then switch to described link single-pass state, and carry out the processing of blocking secondary port.
5. method according to claim 4, it is characterized in that, when described host node is in link single-pass state, further comprise:, then switch to described plooing fault state if described host node does not all receive health detection message on Primary port and secondary port.
6. method according to claim 1, it is characterized in that, described host node comprises in the step that sends health detection message on the Primary port and secondary port: after detecting the health detection message and open auxiliary port that is not receiving on the secondary port from master port at host node, host node periodically sends health detection message respectively on Primary port and secondary port;
Described host node makes secondary port be in blocked state to comprise: host node is carried out the processing of blocking secondary port.
7. host node, it is characterized in that, be arranged in ethernet ring network with loop network structure, comprise host node in this Ethernet ring and more than one transmission node, host node and each transmission node service data transmission on ethernet ring network are finished the miscellaneous service function, and, host node is responsible for the state of each transmission node and link on the ethernet ring network is monitored, and comprising:
The loop detection unit is used for sending health detection message by Primary port and secondary port, receives health detection message if only detect in Primary port and secondary port, then sends congestion notification to secondary port controlling unit;
Secondary port controlling unit is used for after receiving congestion notification, makes secondary port be in blocked state.
8. host node according to claim 7, it is characterized in that, described loop detection unit is used for when switching to good working condition, notify secondary port controlling unit to block secondary port, and periodicity sends health detection message on master port, if on secondary port, do not receive health detection message from master port, then on secondary port, send health detection message, if on master port, receive health detection message from secondary port, determine that then described only detecting receives health detection message in Primary port and secondary port, and carry out the described processing that sends congestion notification to secondary port controlling unit.
9. host node according to claim 8, it is characterized in that, described loop detection unit, be further used for when being in good working condition, if on secondary port, do not receive health detection message from master port, on master port, receive health detection message from secondary port, then switch to link single-pass state, after switching to link single-pass state, carry out describedly sending the processing of congestion notification, and further when being in link single-pass state, on Primary port and secondary port, periodically send health detection message respectively to secondary port controlling unit, if on Primary port and secondary port, all receive health detection message, then switch to described good working condition.
10. host node according to claim 9, it is characterized in that, described loop detection unit, be further used for when being in good working condition, if on Primary port and secondary port, all do not receive health detection message, then switch to the plooing fault state, after switching to the plooing fault state, notice is opened in transmission to secondary port controlling unit, and on Primary port and secondary port, periodically send health detection message respectively, if on Primary port and secondary port, all receive health detection message, then switch to described good working condition, if only receive health detection message in Primary port and secondary port, then switch to described link single-pass state;
Described secondary port controlling unit, be further used for receive open notice after, the open auxiliary port.
11. host node according to claim 10, it is characterized in that described loop detection unit is further used for when being in link single-pass state, if on Primary port and secondary port, all do not receive health detection message, then switch to described plooing fault state.
12. host node according to claim 7, it is characterized in that, described loop detection unit is used for periodically sending health detection message respectively on Primary port and secondary port after detecting the health detection message and open auxiliary port that is not receiving on the secondary port from master port.
13. a system that avoids producing loop is characterized in that, this system comprises a plurality of transmission nodes and as any described host node in the claim 7 to 12.
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| CN101873244A (en) * | 2010-06-09 | 2010-10-27 | 神州数码网络(北京)有限公司 | Automatic multi-loop protection method |
| CN101651596B (en) * | 2009-09-27 | 2011-06-29 | 迈普通信技术股份有限公司 | Method for accelerating switching during Ethernet automatic protection switching failure |
| WO2012175035A1 (en) * | 2011-06-21 | 2012-12-27 | 华为技术有限公司 | Monitoring method, access device and network system for accessing network with ring network |
| CN101820376B (en) * | 2010-02-04 | 2013-07-17 | 深圳市金宏威技术股份有限公司 | Method and system for realizing rapid convergence in ring network |
| CN105429892A (en) * | 2015-10-29 | 2016-03-23 | 北京星网锐捷网络技术有限公司 | Method and device of avoiding loops for track traffic network |
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| US6785226B1 (en) * | 1999-09-01 | 2004-08-31 | Carriercomm, Inc. | System and method for data routing over a network |
| JP4074631B2 (en) * | 2005-11-07 | 2008-04-09 | 株式会社日立製作所 | Transmission path system, frame transmission apparatus in the system, and transmission path switching method |
| CN101001192B (en) * | 2007-01-17 | 2010-04-21 | 华为技术有限公司 | Method, system and equipment for protecting ring network link |
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| CN101651596B (en) * | 2009-09-27 | 2011-06-29 | 迈普通信技术股份有限公司 | Method for accelerating switching during Ethernet automatic protection switching failure |
| CN101820376B (en) * | 2010-02-04 | 2013-07-17 | 深圳市金宏威技术股份有限公司 | Method and system for realizing rapid convergence in ring network |
| CN101873244A (en) * | 2010-06-09 | 2010-10-27 | 神州数码网络(北京)有限公司 | Automatic multi-loop protection method |
| CN101873244B (en) * | 2010-06-09 | 2012-10-10 | 神州数码网络(北京)有限公司 | Automatic multi-loop protection method |
| WO2012175035A1 (en) * | 2011-06-21 | 2012-12-27 | 华为技术有限公司 | Monitoring method, access device and network system for accessing network with ring network |
| CN105429892A (en) * | 2015-10-29 | 2016-03-23 | 北京星网锐捷网络技术有限公司 | Method and device of avoiding loops for track traffic network |
| CN105429892B (en) * | 2015-10-29 | 2018-10-12 | 北京星网锐捷网络技术有限公司 | A kind of method and apparatus of the anti-loops of Rail traffic network |
| CN105577484A (en) * | 2016-03-01 | 2016-05-11 | 上海斐讯数据通信技术有限公司 | EAPS failure detection method and system, and EAPS network |
| WO2020052687A1 (en) * | 2018-09-14 | 2020-03-19 | 中兴通讯股份有限公司 | Network element anti-looping method and apparatus, device, and readable storage medium |
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