CN101877646B - Protection switching method and node equipment - Google Patents
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Abstract
The invention discloses a protection switching method and corresponding node equipment. By adopting a control mechanism of modifying node equipment and sending fault indication messages or adopting a mode of carrying protection switching request information in connection monitoring messages, the embodiment of the invention enables the node equipment at two ends to be capable of carrying out consistent switching operations in time, thereby preventing services from losing.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of protection reverse method and corresponding node device.
Background technology
In transmitting network, usually adopt protection to switch to guarantee the reliability of institute's transport service, namely when transport network node or link break down, the business on the failure path is switched on the backup path of prior appointment and transmit.Herein, the transmission channel that transport network is used under normal circumstances is called work transmission entity, one or more corresponding with it transmission channel for subsequent use is called protection transmits entity.
The below is respectively take multiprotocol label switching (MPLS:Multi-Protocol Label Switching) and Ethernet as example, and the protection reverse method of present use is introduced.
One, the unidirectional protection among the MPLS is switched
With reference to figure 1; work transmission entity and protection transmit entity and are the one-way transmission entity (namely among the MPLS; the connection of setting up between two node devices is unidirectional; can only be to a direction transport service; the fault that produces in this case can only be a unidirectional fault that direction occurs that is connecting); therefore the unidirectional protection Switchover mechanism is only described (namely here; when unidirectional fault occurs; only switch the business of the direction that breaks down; this mechanism is applicable to unidirectional connection, also is applicable to two-way connection).The node device of source A uses bridger which is chosen in and transmits transmission business on the entity; the node device of egress Z uses selector to select which transmits entity from and receives business; transmit on the entity and be provided with fault monitoring point a; be used for judging the operating state that transmits entity, accident defect is namely normally still arranged.Certainly, not shown in Figure 1 other can also be arranged in the same way between this a pair of node device or reverse connection entity.
With reference to figure 1 (a), in the situation of work transmission entity normal operation, business transmits in work transmission entity.With reference to figure 1 (b), when work transmission entity breaks down, the fault monitoring point a of egress Z detects Signal Fail (SF:Signal Fail, as connectivity lose, mistake the fault such as connects) or Signal Degrade (SD:Signal Degrade, surpass the faults such as threshold value of expecting such as packet loss or time-delay), report forward faults indication (FDI, Forward Defect Indication) or alarm indication signal (AIS
Alarm Indication Signal), the selector of egress Z switches to accordingly protection and transmits entity reception business.Egress fault monitoring point passes through other reverse paths (such as a proprietary reverse label switched path (LSP:Label Switching Path); perhaps share reverse LSP; perhaps other non-MPLS connect etc.) send backward faulty indication (BDI:Backward Defect Indication) message to source A; be used for notice source A and to the Z direction of transfer fault occured at A; the bridger of source A can be selected accordingly to switch to protection and transmit entity transmission business, switches thereby finish protection.After the fault of work transmission entity disappears, various alarm signals, also along with disappearance, for the protection of recovery formula, business can be switched back again work transmission entity, i.e. state shown in Fig. 1 (a) such as FDI, AIS, BDI etc.
Two, the bidirectional protective in the Ethernet is switched
With reference to figure 2; work transmission entity in the Ethernet (comprising path 1 and path 2) and protection transmit entity (comprising path 3 and path 4) and are two-way transmission entity (namely; the connection of setting up between two node devices is two-way; both direction can transport service; both can produce unidirectional fault in this case; also can be created in simultaneous bi-directional failure on the both direction of connection); two ends are expressed as respectively C and D; fault detect mode and MPLS are similar, and be not shown in Figure 2.Here only describe bidirectional protective Switchover mechanism (that is, no matter be unidirectional fault or bi-directional failure, the business of both direction all will be switched), the situation of its unidirectional protection Switchover mechanism and above-mentioned MPLS network is similar, repeats no more.
With reference to figure 2 (a), in the situation of path 1 and path 2 normal operations, two-way services respectively in the path 1 and path 2 transmit.With reference to figure 2 (b); at the work transmission entity unidirectional fault; when for example break down in path 1; the D end detects fault; the business of reception and sending direction is switched to respectively path 3 and 4; D end 2 sends far-end faults indication (RDI:Remote Defect Indication) message informing C end and to the direction of D fault has occured at C in the path, and it is professional that the C end is selected to switch on path 3 and 4 sending and receiving accordingly, switches thereby finish bidirectional protective.With reference to figure 2 (c), when the work transmission entity bi-directional failure, two ends all can detect fault, all two-way business are switched to path 3 and 4, switch thereby finish bidirectional protective.When the two-way recovery of work transmission entity was normal, namely two ends had not all both detected the receive direction fault, did not receive RDI yet, then returned to the state shown in Fig. 2 (a).
In the research and practice process to such scheme; the present inventor finds: because node device is switched according to the information protection relevant with fault or recovered; if two end node devices are inconsistent to the treatment mechanism of malfunction, will cause protecting that switch or recover can't consistent carrying out.
Summary of the invention
The embodiment of the invention provides and can make transmission entity two ends switch consistent protection reverse method and corresponding node device.
A kind of protection reverse method comprises: when this end node devices transmits on the entity transport service in protection, know that work transmission entity recovers normal, start the Wait-to-Restore time-delay; This end node devices is after the Wait-to-Restore time-delay reaches the first setting-up time, stop to send the faulty indication message that is used for notifying current malfunction to peer node equipment, switch to work transmission entity so that peer node equipment transmits entity with business from protection after jumping out malfunction; This end node devices transmits entity with business from protection and switches to work transmission entity after the Wait-to-Restore time-delay reaches the second setting-up time.
A kind of node device comprises: control module, be used for when protection transmits on the entity transport service, know work transmission entity recover normal after, start the Wait-to-Restore time-delay; After the Wait-to-Restore time-delay reaches the first setting-up time, stop to send the faulty indication message that is used for notifying current malfunction to peer node equipment, so that transmitting entity with business from protection, peer node equipment switches to work transmission entity; After the Wait-to-Restore time-delay reached the second setting-up time, control transmitted entity with business from protection and switches to work transmission entity; Module is switched in protection, is used for the control according to control module, carries out business and switch between work transmission entity and protection transmission entity.
A kind of protection reverse method comprises: this end node devices is determined the protection switching action that needs are carried out; This end node devices is carried protection switching request information in the connection monitoring message that sends to peer node equipment by protection transmission entity, alleged protection switching request information is used for asking peer node equipment to carry out and this end node devices is protected switching action accordingly.
A kind of node device comprises: sending module is used for transmitting entity by protection and sends the connection monitoring message to peer node equipment; Control module; be used for after determining the protection switching action that needs to carry out; carry protection switching request information in sending module sends to the connection monitoring message of peer node equipment, alleged protection switching request information is used for request peer node equipment and carries out with this end node devices and protect accordingly switching action.
The embodiment of the invention adopts revises the controlling mechanism that node device sends the faulty indication message, perhaps carries the mode of protection switching request information in the connection monitoring message, so that two end node devices can be carried out consistent switching operation, avoids loss of traffic.
Description of drawings
Fig. 1 (a)～(b) is the sight schematic diagram that protection is switched among the existing MPLS;
Fig. 2 (a)～(c) is the sight schematic diagram that protection is switched in the existing Ethernet;
Fig. 3 is the schematic flow sheet of the embodiment of the invention one protection reverse method;
Fig. 4 is the logical construction schematic diagram with the corresponding node device of embodiment one method;
Fig. 5 is the schematic flow sheet of the embodiment of the invention two protection reverse methods;
Fig. 6 is the logical construction schematic diagram with the corresponding node device of embodiment two methods;
Fig. 7 is that embodiment one method is applied to the process schematic diagram that protection is switched among the MPLS;
Fig. 8 be among the embodiment two method at the scene schematic diagram of using two;
Fig. 9 (a)～(c) uses the processing procedure schematic diagram that breaks down in two;
Figure 10 (a)～(c) uses fault clearance processing procedure schematic diagram in two.
Embodiment
The protection reverse method that the embodiment of the invention provides adopts and revises the controlling mechanism that node device sends the faulty indication message, perhaps carries the mode of protection switching request information in the connection monitoring message.The embodiment of the invention also provides corresponding node device.Below be elaborated respectively.
In the following embodiments, node device self can have the functional module for fault monitoring, by fault and fault clearance situation are known in the detection that transmits entity; The failure indication information that node device also can report by the fault monitoring equipment that obtains the outside is known fault and the fault clearance situation that transmits entity.
Embodiment one, a kind of protection reverse method.In the present embodiment, adopt the mode that node device sends the controlling mechanism of faulty indication message of revising.Flow process comprises step with reference to figure 3:
101, this end node devices is when protection transmits on the entity transport service, knows that work transmission entity recovers normal.
Work transmission entity and protection transmission entity can be two-way or unidirectional transmission entities in the present embodiment.This end node devices transmits by protecting reversed process that business is switched on the protection transmission entity normally after work transmission entity breaks down.
1. for the one-way transmission entity, because only there is a direction in work entity, so fault clearance also only need to be followed according to the malfunction of this direction and be judged.
The situation of 2. switching for two-way transmission entity, unidirectional protection, this end node devices know that the fault clearance of work transmission entity receive direction can think that work transmission entity recovers normal.
The situation of 3. switching for two-way transmission entity, bidirectional protective; this end node devices need to be known the fault clearance of work transmission entity receive direction; and do not receive peer node equipment by the faulty indication message that work transmission entity sends, can think that just the work transmission entity recovery is normal.
102, this end node devices starts the Wait-to-Restore time-delay.
When fault clearance, because intermittent defect causes frequently switching/recovery operation, can introduce fixing one section Wait to Restore Time (WTR:wait-to-restore) in order to prevent.After fault disappears, start first Wait-to-Restore time-delay (generally being 5～12 minutes) and enter Wait-to-Restore time-delay state, during this period, business remains on the protection transmission entity and transmits, until WTR lost efficacy, business just can be got back on the work transmission entity and be transmitted.Certainly, if there is the request (for example, the switching request that the fault that newly detects causes) of higher priority before WTR loses efficacy, to arrive, then replace the WTR state.
The Wait-to-Restore time-delay specifically can realize with functional parts such as timer or timers, specifically can adopt modes such as increasing progressively timing or countdown.
103, this end node devices is after the Wait-to-Restore time-delay reaches the first setting-up time, stop to send faulty indication message (the perhaps all right fault clearance indication message that further transmits) to peer node equipment, after jumping out malfunction, switch to work transmission entity with the equipment failure state elimination of notice peer node and indication peer node equipment.
104, this end node devices transmits entity with business from protection and switches to work transmission entity after the Wait-to-Restore time-delay reaches the second setting-up time.Switch in the protection of one-way transmission entity, two-way transmission entity bidirectional, the unidirectional protection of two-way transmission entity is switched etc. under the various applicable cases, the handover operation of carrying out when this step will be switched according to protection switches back work transmission entity with the business of correspondence direction.
The reason that step 103 and 104 is carried out in two steps is, transport network for some type, MPLS for example, peer node equipment need to not receive all in continuous several cycles that the faulty indication message just jumps out malfunction, in this case, this end node devices needs to wait for a period of time to carry out after stopping paying out the faulty indication message again and recovers to switch, to guarantee the consistent of two ends action.Time difference between the first setting-up time and the second setting-up time can be set to node device and jump out malfunction needed detection time.
Except above-mentioned protection is switched the recovery process, present embodiment also can be further considered the situation of execute protection reversed process when work transmission entity breaks down, and comprises step:
105, this end node devices during transport service, is known work transmission entity receive direction fault on work transmission entity.
106, this end node devices starting protection is switched time-delay.
When protection is switched; the number of times of switching for limiting protecting; allow lower floor or upstream before upper strata or downstream, to implement protection (if namely business has been recovered in lower floor or upstream; upper strata or downstream needn't be implemented protection again and be switched), can introduce protection and switch time-delay (Hold-offtimer).Namely after detecting fault, first starting protection is switched time-delay (being generally 0～10 second) and is entered protection and switch the time-delay state, switches according to up-to-date malfunction after overtime again.Protection is switched time-delay and can be realized with functional parts such as timer or timers equally.
107, this end node devices protection switch the time-delay reach setting-up time after; business is switched to protection from work transmission entity transmit entity; and to the transmission of peer node equipment for the faulty indication message of notifying current malfunction, so that peer node equipment switches to protection transmission entity with business from work transmission entity.
The form of faulty indication message can arrange with reference to existing mode in the present embodiment, and it not only is used for the announcement oam state, the foundation of also switching as trigger protection, but transmission be arranged on opportunity protection switch time-delay overtime after.
1. transmitting entity for work transmission entity with protection is the situation of one-way transmission entity, such as MPLS.The faulty indication message can send with reference to existing mode, namely oppositely transmit entities (such as another unidirectional LSP with the working LSP opposite direction) or other available Opposite direction connections (non-LSP, as IP-based control channel etc.) by this end node devices by other and send peer node equipment to.
2. transmitting entity for work transmission entity with protection is the situation of two-way transmission entity, such as Ethernet.For avoiding bi-directional failure to cause the faulty indication message unreachable, can transmit entity by protection by this end node devices and send peer node equipment to.
It can be that bidirectional protective is switched that performed protection is switched; to be this end node devices in protection switch all switches to protection with the business of both transmit and receive direction after time-delay reaches setting-up time and transmits entity, sends simultaneously faulty indication message indication peer node equipment and carries out corresponding two-way handover operation.
It also can be that unidirectional protection is switched that performed protection is switched; to be this end node devices in protection switch switches to protection with the business of receive direction after time-delay reaches setting-up time and transmits entity, sends simultaneously the business with sending direction that faulty indication message indication peer node equipment carries out and switches to the unidirectional handover operation that protection transmits entity.Obviously, in this case, the protection switching operation of this end node devices sending direction will be carried out by the faulty indication message that protection transmits the entity transmission according to peer node equipment.
The transmission opportunity of above-described embodiment by control faulty indication message (switches in protection and to send after time-delay reaches setting-up time; after reaching setting-up time, the Wait-to-Restore time-delay stops to send); carrying out Operations, Administration and Maintenance (OAM:Operation; Administration and Management) switches with appropriate trigger protection on opportunity when state advertisement; can carry out consistent switching and recovery operation so that transmit the node device at entity two ends, avoid loss of traffic.
The below describes the embodiment of the node device of the present invention that is used for carrying out above-mentioned protection reverse method, and its basic logical structure is with reference to figure 4, comprises that mainly control module 201 and protection switch module 202.
Corresponding with method among the embodiment one, control module 201 also can be further used for, on work transmission entity during transport service, know work transmission entity receive direction fault after, starting protection is switched time-delay; Protection switch the time-delay reach setting-up time after; control switches to protection with business from work transmission entity and transmits entity; and to the transmission of peer node equipment for the faulty indication message of notifying current malfunction, so that peer node equipment switches to protection transmission entity with business from work transmission entity.
Preferably, control module 201 is used for after the Wait-to-Restore time-delay reaches setting-up time, control transmits entity with business from protection and switches to work transmission entity, stop to send the faulty indication message to peer node equipment, specifically can be for: after Wait-to-Restore time-delay reaches the first setting-up time, stop to send the faulty indication message to peer node equipment; After the Wait-to-Restore time-delay reached the second setting-up time, control transmitted entity with business from protection and switches to work transmission entity.
Be to be understood that, when above-mentioned node device specifically is applied in the actual transmission network, (for example each several part is with software can to adopt the way of realization that is fit to according to the needs of network type, or hardware, or the form of software and hardware combining is deployed on the identical or different physical entity) and/or increase the application function that is fit to.
Embodiment two, a kind of protection reverse method.In the present embodiment, adopt the mode of in the connection monitoring message, carrying protection switching request information.Flow process comprises step with reference to figure 5:
301, this end node devices need to determine the protection switching action of execution.
Work transmission entity is two-way transmission entity with protection transmission entity in the present embodiment.The alleged protection switching action that need to carry out comprises that business is switched to protection from work transmission entity to be transmitted entity and business is switched to two kinds of situations of work transmission entity from protection transmission entity.
1. this end node devices can be by knowing work transmission entity receive direction fault, determining that business need to be switched to protection from work transmission entity transmits entity.Concrete fault detect mode can be determined according to the type of the transport network of practical application, for example in Ethernet and MPLS, can not receive that in setting cycle the connection monitoring message determines the loss of connectivity fault by detecting work transmission entity, certainly, can also be the fault of other types, connect, miss the cycle etc. as missing.
Certainly; also can introduce protection and switch time-delay, that is, this end node devices starting protection after knowing work transmission entity receive direction fault is switched time-delay; switch after time-delay reaches setting-up time in protection, self business is switched to protection from work transmission entity transmit entity.
In addition, after this end node devices is known work transmission entity receive direction fault, this end node devices can be carried failure indication information usually in sending to the connection monitoring message of peer node equipment, alleged failure indication information is used for the current malfunction of notice peer node equipment;
The form of failure indication information and load mode can arrange with reference to existing mode in the present embodiment, and just it only is used to indicate oam state, the foundation of not switching as trigger protection.
2. this end node devices can be normal by knowing the work transmission entity recovery, determines business to be switched to work transmission entity from protection transmission entity.
Certainly, also can introduce the Wait-to-Restore time-delay, namely; this end node devices is after knowing that work transmission entity is recovered normally; start the Wait-to-Restore time-delay, after the Wait-to-Restore time-delay reaches setting-up time, self business is transmitted entity from protection switch to work transmission entity.
In addition, after this end node devices knows that the work transmission entity receive direction recovers, this end node devices usually stops at and carries failure indication information (perhaps can also further carry the fault clearance indication information in sending to the connection monitoring message of peer node equipment) in the connection monitoring message that sends to peer node equipment, eliminates with notice peer node equipment failure state.As previously mentioned, in the present embodiment failure indication information stop to transmit the oam state that only is used to indicate fault clearance, as triggering the foundation of recovering to switch to work transmission entity.
302, this end node devices is carried protection switching request information in the connection monitoring message that sends to peer node equipment by protection transmission entity, and alleged protection switching request information is used for asking peer node equipment to carry out and this end node devices is protected switching action accordingly.
In the present embodiment protection switching request information can by in existing connection monitoring message is carried out perhaps form expand to transmit, for example utilize the reservation of connection monitoring message or newly-increased field or bit to represent to protect switching request information.
Performed protection switching action can be that bidirectional protective is switched; be that this end node devices is after determining to need the execute protection switching action; the business of both transmit and receive direction is all switched to corresponding transmission entity, transmit simultaneously protection switching request information indication peer node equipment and carry out corresponding two-way handover operation.
It also can be that unidirectional protection is switched that performed protection is switched; be that this end node devices is after determining to need the execute protection switching action; only the business with receive direction switches to corresponding transmission entity, transmits simultaneously protection switching request information indication peer node equipment and only the business of its sending direction is switched to corresponding transmission entity.Obviously, in this case, the protection switching operation of this end node devices sending direction will be carried out according to the protection switching request information that peer node equipment transmits.
Corresponding with previous step, the protection switching action of protection switching request information request comprises that business is switched to protection from work transmission entity to be transmitted entity and business is switched to two kinds of situations of work transmission entity from protection transmission entity.
Need to prove that the situation that protection is switched for two-way transmission entity bidirectional is because when bi-directional failure occurring, two end node devices may be in simultaneously protection and switch the time-delay state or be in simultaneously Wait-to-Restore time-delay state.Therefore, be to save system resource, after being in protection and switching the node device of time-delay state and receive the protection switching request information that transmits the opposite end, can remove self etc. the time-delay state of switching to be protected; The node device that is in Wait-to-Restore time-delay state finds that the opposite end stops to transmit (or the protection of receiving the opposite end recovers indication information) after the protection switching request information, can remove the Wait-to-Restore time-delay state of self.
Above-described embodiment is by carrying the mode of protection switching request information with the connection monitoring message; oam state announcement (for example failure indication information) and trigger protection switched separate; node device is only switched according to the transmission protection of protection switching request information and is recovered; can carry out consistent switching and recovery operation so that transmit the node device at entity two ends, avoid loss of traffic.
The below describes the embodiment for the node device of the present invention of carrying out above-mentioned protection reverse method, and its basic logical structure mainly comprises sending module 401 and control module 402 with reference to figure 6.
Sending module 401 is used for transmitting entity by protection and sends the connection monitoring message to peer node equipment.
Be to be understood that, when above-mentioned node device specifically is applied in the actual transmission network, (for example each several part is with software can to adopt the way of realization that is fit to according to the needs of network type, or hardware, or the form of software and hardware combining is deployed on the identical or different physical entity) and/or increase the application function that is fit to.
For better understanding above-described embodiment, the below describes with the example that is applied as in concrete transport network.
The application (one-way transmission entity) of method in MPLS among application one, the embodiment one.
The network connection schematic diagram of MPLS can be with reference to figure 1 (a) in this application.The execution that protection is switched and recovery flow process comprise with reference to figure 7:
1. suppose that the Z node do not receive the CV/FFD message in continuous three connection monitoring message (CV/FFD) cycles, the Z node enters the near terminal fault state, starts Hold-offtimer.
2. Z node Hold-offtimer is overtime, and the Z node selects protection to transmit the entity transport service.Simultaneously, the Z node sends the BDI message to the A node.
3. the A node is receiving that first BDI message just enters the far-end fault state, selects protection to transmit the entity transport service.At this moment, A, Z node have as one man switched business.
4. before fault was not recovered, the Z node continued to send BDI to the A node according to certain transmission cycle (such as 1s).
5. when fault clearance, the Z node is jumped out near terminal fault state (continuous three CV/FFD transmission cycle is received two correct CV/FFD messages at least), starts WTR timer.
6. the Z node stops to send the BDI message to the A node after WTR timer reaches the first setting-up time (WTR-3 second).
7. the A node is not received a correct BDI message in continuous three transmission cycles (3 seconds), namely jumps out the far-end fault state, and the A node is selected the work transmission entity transport service.
8. after WTR timer reached the second setting-up time (WTR), the Z node was selected the work transmission entity transport service.At this moment, A, Z node have as one man switched business.Time difference between the first setting-up time and the second setting-up time (3 seconds) is the A node and jumps out malfunction needed detection time.
The application (two-way transmission entity, bidirectional protective switch) of method in Ethernet among application two, the embodiment two.
With reference to figure 8, work transmission entity is path 1 and path 2, and it is that path 3 and path 4, two end node devices are expressed as respectively C and D that protection transmits entity.Whether C end and D end utilize detection of connectivity (CCM) message to come testing to transmit entity has fault to occur.Under normal circumstances, two-way services respectively in the path 1 and path 2 transmit.C end be connected with D all work transmission entity be connected transmission entity transmission CCM message to monitor connection.
1, the processing procedure that breaks down:
With reference to figure 9 (a), during work transmission entity generation bi-directional failure, the C end detects path 2 faults, and beginning is 1 transmission RDI message (that is, with the RDI indication set of CCM message) in the path, and starts Hold-offtimer, is assumed to 500ms; The D end detects path 1 fault, and beginning is 2 transmission RDI messages in the path, and start Hold-offtimer, are assumed to 200ms.
With reference to figure 9 (b), after the 200ms, D end Hold-off timer is overtime, and the D end switches to two-way services on path 3 and the path 4, and beginning 4 sends the CCM_P messages (that is, with a reservation bit set of CCM message in the path; This bit can be called the P bit, reset represents that business transmits in work transmission entity; Set represents that then business has switched to protection and transmitted on the entity and transmit, and the CCM with the set of P bit in this example is designated as CCM_P, reset still be designated as CCM).
With reference to figure 9 (c), C holds the CCM_P message of receiving that the D end sends, judges the set of P bit, then removes the Hold-off state of self, two-way services is switched on path 3 and the path 4, and begin the 3 transmission CCM_P messages in the path.At this moment, C, D two ends arrange in the inconsistent situation at Hold-offtimer, have as one man switched business.
2, the processing procedure of fault clearance:
With reference to Figure 10 (a), after the fault clearance, C end detects path 2 and recovers, and stops to send the RDI message on the path 1 and send the CCM message elsewhere, and starts WTRtimer, is assumed to 5 minutes; D end detects path 1 and recovers, and beginning 2 is sent the CCM message elsewhere in the path, and starts WTRtimer, is assumed to 12 minutes.
With reference to Figure 10 (b), after 5 minutes, C end WTR timer is overtime, and the C end switches to two-way services on path 1 and the path 2, and stops at and send the CCM_P message on the path 3 and send the CCM message elsewhere.
With reference to Figure 10 (c), D end is received the CCM message that the C end sends, and judges the reset of P bit, then removes the WTR state of self, two-way services are switched on path 1 and the path 2, and beginning 4 is sent the CCM message elsewhere in the path.At this moment, C, D two ends arrange in the inconsistent situation at WTR timer, have as one man switched business.
Adopt in the above-mentioned application and in the CCM that the Protection entity sends, increase the mode that a P bit is used as protecting switching request; also can in CCM protocol Data Unit (PDU:Protocol Data Unit), increase some fields or type-length-value (TLV:Type length Value) and carry protection switching request information; benefit than the mode of only using a bit is to carry various protection switching request information like this, such as path failure, manually switch, Forced Switch etc.No matter which kind of mode all needs and the difference of existing CCM message.What deserves to be explained is, when using the mode of TLV, need in the fixed field of PDU, indicate whether to carry this TLV with at least one bit.
In the above-mentioned application examples in Ethernet, to use Ethernet (ETH; Ethernet) to carry protection switching request information be example to the CCM message; also can use the message of other form to carry protection switching request information, so long as the connection monitoring message get final product, carrying mode and should use-case similar.In the time of for example in being applied in MPLS or IP network, also can using bi-directional failure to detect (BFD, Bidirectional Fault Detection) message and carry protection switching request information, the carrying mode when carrying mode and use CCM is similar.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of above-described embodiment is to come the relevant hardware of instruction finish by program, this program can be stored in the computer-readable recording medium, storage medium can comprise: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), disk or CD etc.
More than protection reverse method and corresponding node device that the embodiment of the invention is provided be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (7)
1. a protection reverse method is characterized in that, comprising:
When this end node devices transmits on the entity transport service in protection, know that work transmission entity recovers normal, start the Wait-to-Restore time-delay;
This end node devices is after the Wait-to-Restore time-delay reaches the first setting-up time, stop to send the faulty indication message that is used for notifying current malfunction to peer node equipment, switch to work transmission entity so that peer node equipment transmits entity with business from protection after jumping out malfunction;
This end node devices transmits entity with business from protection and switches to work transmission entity after the Wait-to-Restore time-delay reaches the second setting-up time;
Wherein, the time difference between described the first setting-up time and the second setting-up time is that peer node equipment is jumped out malfunction needed detection time.
2. the method for claim 1 is characterized in that, also comprises:
This end node devices during transport service, is known work transmission entity receive direction fault on work transmission entity, starting protection is switched time-delay;
This end node devices protection switch the time-delay reach setting-up time after; business is switched to protection from work transmission entity transmit entity; and to the transmission of peer node equipment for the faulty indication message of notifying current malfunction, so that peer node equipment switches to protection transmission entity with business from work transmission entity.
3. the method for claim 1; it is characterized in that: it is the one-way transmission entity that adopts multiprotocol label switching that described work transmission entity and protection transmit entity, and described faulty indication message sends by transmitting the reverse transmission entity of entity with described work transmission entity and protection.
4. a node device is characterized in that, comprising:
Control module is used for when protection transmits on the entity transport service, know work transmission entity recover normal after, start the Wait-to-Restore time-delay; After the Wait-to-Restore time-delay reaches the first setting-up time, stop to send the faulty indication message that is used for notifying current malfunction to peer node equipment, so that transmitting entity with business from protection, peer node equipment switches to work transmission entity; After the Wait-to-Restore time-delay reaches the second setting-up time, control transmits entity with business from protection and switches to work transmission entity, wherein, the time difference between described the first setting-up time and the second setting-up time is that peer node equipment is jumped out malfunction needed detection time;
Module is switched in protection, is used for the control according to described control module, carries out business and switch between work transmission entity and protection transmission entity.
5. node device as claimed in claim 4 is characterized in that:
Described control module also is used for, on work transmission entity during transport service, know work transmission entity receive direction fault after, starting protection is switched time-delay; Protection switch the time-delay reach setting-up time after; control switches to protection with business from work transmission entity and transmits entity; and to the transmission of peer node equipment for the faulty indication message of notifying current malfunction, so that peer node equipment switches to protection transmission entity with business from work transmission entity.
6. a protection reverse method is characterized in that, comprising:
This end node devices is known work transmission entity receive direction fault, determines that the protection switching action that needs to carry out transmits entity for business is switched to protection from work transmission entity;
The connection monitoring message that failure indication information is carried in the transmission of this end node devices is to peer node equipment, and described failure indication information is used for the current malfunction of notice peer node equipment, the foundation of not switching as trigger protection;
This end node devices by protection transmit entity send carry protection switching request information the connection monitoring message to peer node equipment, described protection switching request information is used for request peer node equipment and carries out with this end node devices and protect accordingly switching action.
7. a protection reverse method is characterized in that, comprising:
This end node devices knows that the work transmission entity recovery is normal, determines that the protection switching action that needs to carry out is business to be transmitted entity from protection switch to work transmission entity;
This end node devices stop to send carry failure indication information the connection monitoring message to peer node equipment, be used for notice peer node equipment failure state and eliminate the foundation of not switching as trigger protection;
This end node devices by protection transmit entity send carry protection switching request information the connection monitoring message to peer node equipment, described protection switching request information is used for request peer node equipment and carries out with this end node devices and protect accordingly switching action.
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| CN2009101353866A CN101877646B (en) | 2009-04-28 | 2009-04-28 | Protection switching method and node equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101353866A CN101877646B (en) | 2009-04-28 | 2009-04-28 | Protection switching method and node equipment |
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| CN101877646A CN101877646A (en) | 2010-11-03 |
| CN101877646B true CN101877646B (en) | 2013-03-20 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10708132B2 (en) | 2011-12-29 | 2020-07-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Technique for handling a status change in an interconnect node |
| CN102571460B (en) * | 2012-03-09 | 2018-02-13 | 中兴通讯股份有限公司 | Single-fiber failure switching method and device |
| CN104660431B (en) * | 2013-11-21 | 2019-01-15 | 中兴通讯股份有限公司 | A kind of network alarm method, equipment and terminal |
| EP3139527B1 (en) * | 2014-05-08 | 2018-08-15 | Huawei Technologies Co., Ltd. | Protection switching method, node and control device |
| CN106789264B (en) * | 2016-12-26 | 2019-12-03 | 北京东土军悦科技有限公司 | A kind of method and apparatus that link aggregation group channel is switched fast |
| CN108667643A (en) * | 2017-03-30 | 2018-10-16 | 华为技术有限公司 | A kind of communication failure restoration methods and the first communication network element |
| CN107453905A (en) * | 2017-07-31 | 2017-12-08 | 烽火通信科技股份有限公司 | A kind of flexibly Ethernet 1：1 pretection switch implementation method |
| CN107395425A (en) * | 2017-07-31 | 2017-11-24 | 烽火通信科技股份有限公司 | A kind of flexibly Ethernet 1+1 protection switches implementation method |
| CN108419259B (en) * | 2018-02-11 | 2021-05-28 | 烽火通信科技股份有限公司 | Method and system for realizing flexible Ethernet protection switching based on reserved overhead field |
| CN109218107A (en) * | 2018-10-15 | 2019-01-15 | 迈普通信技术股份有限公司 | Link switch-over method, device, the network equipment and network system |
| CN111385115B (en) * | 2018-12-28 | 2022-11-08 | 中兴通讯股份有限公司 | Reverse service path fault transmission processing method and device |
| CN112448755A (en) * | 2019-08-30 | 2021-03-05 | 中兴通讯股份有限公司 | Method, device and equipment for realizing optical channel 1+1 protection |
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