CN101453264A - Self-healing protection method and apparatus for optical network - Google Patents
Self-healing protection method and apparatus for optical network Download PDFInfo
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Abstract
The embodiment of the invention provides a self-healing protection method for an optical network, which comprises the following steps: a network element receives two or more than two switching request messages, switching instructions carried in the switching request messages are read, and priorities corresponding to the switching instructions are compared; according to different priorities corresponding to the switching instructions, the switching instruction with the higher priority is preferentially executed, and executes the near-end switching under the condition that a working channel SF for bearing service on a self-healing protection cycle of the optical network has secondary failure and a corresponding protection channel can work. The embodiment of the invention also provides a corresponding switching initialization device in the optical network, a switching response device in the optical network, and another self-healing protection method for the optical network. The technical proposal provided by the embodiment of the invention adopts the protection channel as much as possible to protect corresponding service under the condition that the protection channel can work, thereby ensuring that a switching initialization end can initialize proper switching requests to ensure that the service on the protection cycle can be protected as much as possible.
Description
Technical field
The present invention relates to technical field of optical network communication, relate in particular to a kind of self-healing protection method and device of optical-fiber network.
Background technology
As Optical Transmission Network OTN (Optical Transport Network; OTN), synchronous digital hierarchy (Synchronous Digital Hierarchy; SDH), synchronous optical network (Synchronous OpticalNetwork; SONET) or the like optical-fiber network; usually adopt APS (AutomaticProtection Switching; APS) technology, the self-healing ability of raising optical-fiber network.
Referring to Fig. 1, Fig. 1 is the structural representation of SDH multiplexing section protection rings.Among Fig. 1, guard ring is provided with four nodes, identifies this four nodes respectively with " #1 ", " #2 ", " #3 " and " #4 ", and service aisle is indicated by solid line, and protection passage with dashed lines indicates.If the business between " #1 " and " #2 " is professional 1; Business between " #3 " and " #4 " is professional 2.With guard ring shown in Figure 1 is example, and the self-healing ability of optical-fiber network is described.
On the guard ring shown in Figure 1, unusual if the service aisle between certain two adjacent node takes place, then need to enable the protection passage on the guard ring, carry the business between these two nodes.Correspondingly, the side in two nodes will be as switching originating end, and the opposing party who switches responder to conduct initiates switching request.After switching responder and receiving switching request, by directly or indirectly with switch originating end and switch negotiation, the business between these two nodes is switched to the protection passage from service aisle, thereby enables protection path protection business, guarantee professional normal operation.
The switchover mode of enabling protection path protection business can comprise that near-end is switched with far-end and switch.
So-called near-end is switched and can is; switch responder receive switch the switching request that originating end sends after; directly with switch originating end and switch negotiation, will and switch the business between the originating end, from and switch service aisle between the originating end and be switched to and switch on the protection passage between the originating end.Illustrate, take place unusually as the service aisle between " #1 " and " #2 ", and the protection passage does not have disabled status, then so-called near-end is switched and is meant, on the professional 1 protection passage that is switched between " #1 " and " #2 ".Claim that the service aisle between the adjacent node is the section service aisle, also claim the near side (ns) service aisle; Claim that the protection passage between the adjacent node is the segment protection passage, also claim near side (ns) protection passage, switch the business on the segment protection passage, promptly be called near-end and switch.
So-called far-end is switched and can is; switch responder receive switch the switching request that originating end sends after; on guard ring; and switch the intermediate node of the existence between the originating end; indirectly with switch originating end and hold consultation; with business from and switch service aisle between the originating end, be switched on the distal edge protection passage.Illustrate, as, " #1 " and " #4 ", " #4 " and " #3 ", and the formation of the protection passage between " #3 " and " #2 " distal edge protection passage, this distal edge protection passage also claims the ring protection passage.Business 1 is carried by this distal edge protection passage.Near-end is switched and is also referred to as span switching, and far-end is switched and is also referred to as ring switching.
In the prior art scheme, can provide message format based on the ITUT normal structure between each node and other nodes of being attached thereto and carry out interacting message, provide the definition of APS byte in this message format.
Referring to Fig. 2, Fig. 2 is the structural representation of existing APS byte.Wherein, field Request Indication message type takies 4 bits (bits); Field S takies 1bit, if value is 1, then indicating this message is switching request or channel status query requests, if value is 0, then indicating this message is the channel status notice; Field N takies 1bit, if value is 0, then indicating this message is the near-end switching request, if value is 1, then indicating this message is the far-end switching request; Field Res. is the reservation bit number, and the reservation bit number has 2bits; The service aisle that field Requested Channel indication request is switched number; Field Bridged Channel indication has been bridged to the protection channel number; Field Status Channel only is used for the channel status notification message, indicates the channel number relevant with tunnel condition message.
Referring to table one, table one is enumerated the indicated type of message of above-mentioned Request field, also claims request type.Type of message also can be regarded as to make a start and sends the reason of this message, wherein makes a start to comprise and switch originating end.In the table one, type of message embodies the priority that the receiving end that receives message is handled this message, and type of message is arranged from high to low by this priority in the table one.Wherein, receiving end comprises the switching request responder.
| Request | Meaning |
| 1111 | Lockout?Protection ＊ |
| 1110 | Signal?Fail?Protection ＊ |
| 1101 | Forced?Switch |
| 1100 | Signal?Fail |
| 1011 | Signal?Degrade?Protection ＊ |
| 1010 | Signal?Degrade |
| 0110 | Manual?Switch |
| 0101 | Wait?to?Restore?Protection ＊ |
| 0100 | Waitto?Restore |
| 0011 | Exercise ＊ |
| 0010 | Reverse?Request |
| 0000 | No?Request |
Table one
In the table one, " 1111 " indicate certain protection passage locked, unavailable; " 1110 " indicate certain protection channel signal to lose efficacy (SF), and are unavailable; " 1101 " indication request Forced Switch (FS); " 1100 " indicate certain service aisle SF; " 1011 " indicate certain protection channel signal deterioration (SD); " 1010 " indicate certain service aisle SD; " 0110 " indication request Manual Switch (MS); " 0101 " indication request is waited for the recovery of certain protection passage; " 0100 " indication request is waited for the recovery of certain service aisle; Whether " 0011 " indication request is practised certain protection passage, be generally used for detecting defencive function and can normally move; " 0010 " indicates this message is reverse request message, i.e. response message; The no switching request of " 0000 " indication.
Consider the finiteness of this transfer resource of protection passage, and require the promptness of protecting passage to occur switching the business under the unusual situation at service aisle, if need to switch a plurality of business in a guard ring, then priority protection can be switched the business that is protected by near-end; A plurality of near-ends are switched and can be carried out simultaneously.Prior art stipulates that also following failure combination can initiate SF_R far-end switching request:
Service aisle with the equal Signal Fail of protection passage (SF) on the section; Or,
Service aisle SF is with the protection channel signal deterioration (SD) on the section; Or,
Service aisle SD is with the protection passage SF on the section.
Other has technical scheme further far-end to be switched to make regulation, promptly neither allow to carry out a plurality of far-ends simultaneously in the guard ring and switch; Also not allowing to carry out simultaneously far-end switches with near-end and switches.
Illustrate below and adopt the professional example of existing optical network protection technical scheme protection.
Referring to Fig. 3, Fig. 3 is the business scenario schematic diagram that can adopt existing near-end switching technique protection.Among Fig. 3, " #1 " detect and " #2 " between section service aisle SF, and the segment protection passage is normal.According to existing looped network protection technology, " #1 " generates professional 1 relevant switching request message according to detected situation as switching originating end, with table one is example, in the APS byte of this message, Request field value is " 1100 ", indication related work passage SF; The value of N is 0 in this message, and the indication request near-end is switched.
" #1 " sends to this switching request message other nodes that are attached thereto; as " #2 " and " #4 "; disabled status does not take place in the protection passage that " #2 " detects " #2 " sensing " #1 "; therefore after receiving the switching request message that " #1 " sends; as switching responder, return response to " #1 ", and by and " #1 " between the segment protection passage switch negotiation; after consulting successfully, by and " #1 " between segment protection passage choosing receive professional 1 relevant information.
Referring to Fig. 4, Fig. 4 is the business scenario schematic diagram that can adopt existing far-end switching technique protection.Among Fig. 4, " #1 " detects the service aisle and the equal SF of protection passage of " #2 " sensing " #1 "." #1 " as switching originating end, generates switching request message according to detected situation, and in this message, Request field value is " 1100 ", indication service aisle SF, and the N value is 1, the indication request far-end is switched." #1 " sends to " #2 " and " #4 " with this switching request message.After " #2 " received the switching request message that " #1 " send, parsing what asked was that far-end is switched, therefore " #2 " need and " #3 " between switch negotiation, sending the Request field value to " #3 " is the switching request message of " 1100 ".Thereby, after " #3 " receives the switching request message of " #2 " transmission, continue as switching originating end, sending the Request field value to " #4 " is the switching request message of " 1100 ", thereby the Request field value will finally be sent to " #1 " by " #4 " for the switching request message of " 1100 ".After " #1 " receives this switching request message; be further used as and switch responder; and switch negotiation between " #4 "; after consulting successfully; " #4 " further switches negotiation with " #3 "; go down successively, between " #3 " and " #2 ", can consult success, then professional 1 relevant information can be received by the choosing of ring protection passage.
Though the existing optical network protection scheme normal operation of guaranteed service to a certain extent, this scheme is difficult to guarantee professional normal operation in some cases.
As, referring to Fig. 5, Fig. 5 is the business scenario schematic diagram that prior art is difficult to protect.Among Fig. 5, " #1 " detects the service aisle and the equal SF of protection passage of " #2 " sensing " #1 "." #1 " can send the switching request message that the indication request far-end is switched to " #2 "; If " #4 " detects the service aisle SF of " #3 " sensing " #4 ", with the protection passage SD of section, then " #4 " can send the switching request message that the indication request far-end is switched to " #3 "; And prior art is not supported to carry out simultaneously on the guard ring two different far-ends and is switched, and therefore, in the prior art, in the scene shown in Figure 5, professional 1 and professional 2 all can't be protected.
For another example, referring to Fig. 6, Fig. 6 is another business scenario schematic diagram that prior art is difficult to protect.Among Fig. 6, " #1 " detects the service aisle SF of " #2 " sensing " #1 ", and " #1 " can send the switching request message that the indication request near-end is switched to " #2 "; If " #3 " also detects the service aisle SF of " #4 " sensing " #3 ", with the protection passage SD of section, then " #3 " can send the switching request message that the indication request far-end is switched to " #4 ".Do not support near-end to switch with far-end because of prior art and switch execution simultaneously, therefore, in the prior art, professional 1 can be protected, but professional 2 can not be protected.
The business scenario that prior art is difficult to protect is multiple in addition, enumerates no longer one by one at this.In a word, in the prior art, the self-healing ability of optical-fiber network is still waiting to improve.
Summary of the invention
The embodiment of the invention provides a kind of self-healing protection method of optical-fiber network, improves the self-healing ability of optical-fiber network.
A kind of self-healing protection method of optical-fiber network comprises:
Network element receives two or more switching request message; read the indication of switching of carrying in each switching request message; relatively each switches the indication corresponding priorities; switch indication corresponding priorities difference according to each; preferential execution priority is higher switches indication; and this switches the service aisle SF that is designated as bearer service on optical-fiber network self-healed protection ring, and under the situation that corresponding protection passage can be worked, carries out near-end and switch.
The embodiment of the invention also provides a kind of self-healing protection method of optical-fiber network, improves the self-healing ability of optical-fiber network.
A kind of self-healing protection method of self-healing optical-fiber network of optical-fiber network comprises:
On the optical-fiber network self-healed protection ring, switch the service aisle inefficacy SF of originating end at bearer service, and under the protection passage situation about can work, generate professional relevant switching request message, the indication of switching that near-end switches is carried out in the request of carrying of this switching request message;
The described originating end of switching mails to described switching request message and switches responder.
The embodiment of the invention provides the apparatus for initiating of switching in a kind of optical-fiber network, comprising:
Generation unit, the service aisle SF of bearer service on optical-fiber network self-healed protection ring, and under the situation that corresponding protection passage can be worked, generate professional relevant switching request message, the indication of switching that near-end switches is carried out in the request of carrying of this switching request message;
Transmitting element, the described switching request message that described generation unit is generated sends.
Switch responding device in a kind of optical-fiber network, comprising:
First receiving element receives switching request message; Described switching request message is carried at the service aisle SF of bearer service on the optical-fiber network self-healed protection ring, and under the situation that corresponding protection passage can be worked, and the indication of switching that near-end switches is carried out in request;
First processing unit is switched indication according to described, carries out near-end and switches.
Switch responding device in a kind of optical-fiber network, comprising:
Second receiving element receives first and switches the first professional first relevant switching request message that originating end sends, and second switches the second professional second relevant switching request message that originating end sends;
Comparing unit, the first switching request message, first second priority of switching indication of switching that indication and the second switching request message carries of carrying relatively, determine preferential execution priority higher switch indication;
Second processing unit, according to processing priority higher switch indication, the service aisle SF of bearer service on optical-fiber network self-healed protection ring, and under the situation that corresponding protection passage can be worked, carry out near-end and switch.
The technical scheme that the embodiment of the invention provided make by existing switchover mode is made amendment switch originating end can be according to switching that business was fit to; generate suitable switching request message; promptly under the situation that can adopt near-end to switch; adopt near-end to switch, so that protection is professional as far as possible, correspondingly as far as possible; after switching responder and receiving one or more switching request message; can handle switching request,, improve the self-healing ability of optical-fiber network so that the business on the guard ring can be protected as far as possible.
Description of drawings
Fig. 1 is the structural representation of SDH multiplexing section protection rings;
Fig. 2 is the structural representation of existing APS byte;
Fig. 3 is the business scenario schematic diagram that can adopt existing near-end switching technique protection;
Fig. 4 is the business scenario schematic diagram that can adopt existing far-end switching technique protection;
Fig. 5 is the business scenario schematic diagram that prior art is difficult to protect;
Fig. 6 is another business scenario schematic diagram that prior art is difficult to protect;
Fig. 7 is the APS byte structure schematic diagram in the embodiment of the invention;
Fig. 8 is the self-healing protection method flow chart of the optical-fiber network that provides of the embodiment of the invention;
Fig. 9 is the self-healing protection method flow chart of the another kind of optical-fiber network that provides of the embodiment of the invention;
Figure 10 is the structural representation of switching apparatus for initiating in a kind of optical-fiber network of providing of the embodiment of the invention;
Figure 11 is the structural representation of switching responding device in a kind of optical-fiber network of providing of the embodiment of the invention;
Figure 12 is the self-healing protection method flow chart of another optical-fiber network of providing of the embodiment of the invention;
Figure 13 is the structural representation of switching responding device in another optical-fiber network of providing of the embodiment of the invention;
Figure 14 is the embodiment of the invention three handled network scenarios schematic diagrames;
Figure 15 is the embodiment of the invention four handled business scenario schematic diagrames;
Figure 16 is the embodiment of the invention five handled business scenario schematic diagrames;
Figure 17 is the embodiment of the invention six handled business scenario schematic diagrames.
Embodiment
Below in conjunction with accompanying drawing the technical scheme that the embodiment of the invention provides is described in further detail.
Among Fig. 5, business 1 mainly is that in the switching request message that the business 1 that the indication request far-end that " #1 " sends is switched is correlated with, the Request field value of APS byte is " 1100 " with professional 2 reasons that all can't be protected." #3 " also can receive professional 1 relevant switching request message with " #4 ".And the service aisle SF of " if #3 " sensing " #4 "; protection passage SD with section; then " #4 " can send the relevant switching request message of business that the indication request far-end switches 2 to " #3 "; in the APS byte of this message; the value of Request field also is " 1100 ", and " #1 " also can receive professional 2 relevant switching request message with " #2 ".That is to say; some network nodes can be received two different switching request message simultaneously; with " #3 " is example; " #3 " is after receiving two different switching request message; the value that parses Request field in these two switching request message is identical; and all the indication request far-end is switched; because these two switching request message have identical processing priority; and prior art is not indicated in this case; should protect which business; therefore, " #3 " will not handle any one request, cause professional 1 and professional 2 all can not be protected.
The protection passage that occurs " #3 " sensing " #4 " of SD situation among Fig. 5 still can be used for communication, therefore but in fact; desirable way should be to abandon protection professional 1; and protection business as far as possible 2 promptly should be able to be enabled the protection passage between " #3 " and " #4 ", carries out the near-end of business 2 and switches.
Referring to Fig. 6, " #2 " can receive professional 1 relevant switching request message, this message request span switching; " #2 " also can receive professional 2 relevant switching request message, and this message also asks far-end to be switched.Because the processing priority of near-end switching request is than the processing priority height of far-end switching request, therefore, " #2 " responds the near-end switching request, and can't respond the far-end switching request, thereby causes professional 2 can't be protected.And in fact, desirable switch the result and should be, also carry out near-end to professional 2 to switch, utilize the protection passage protection business as far as possible 2 between " #4 " and " #3 ".
Under with section service aisle SF protection passage SD scene, the prior art regulation is initiated the far-end switching request, and does not utilize near-end to switch the business of protecting neatly.Therefore; the present application person finds that based on above analysis to prior art the existing in prior technology problem is, switches originating end and is difficult to embody more kinds of indications that are suitable for switching services by switching request message; as addressing this problem, then will increase the professional possibility that is protected.
The present application person discovers that further in the prior art, switching request message is difficult to embody more kinds of indications that are suitable for switching services.For example, prior art can not be supported to carry out simultaneously far-end and switch, and therefore, under the situation of a plurality of far-end switching request that relevant different business occurs occurring simultaneously on the guard ring, a plurality of business all are difficult to be protected; Need carry out near-end simultaneously in appearance and switch under the situation of switching with far-end, prior art is difficult to guarantee the normal operation of a plurality of business.
In the embodiment of the invention, existing APS byte structure is improved, make the APS byte structure after the improvement can express more indication.The concrete improvement is, existing Request field is expanded, and as get a bit from the reservation bit number, this 1bit is increased in the Request field, and the Request field is expanded.Expansion Request fields account 5bits, the existing Request field that takies 4bits of comparing, expansion Request field can be indicated more request type, certainly, also can increase 2bits or more bits if necessary in the Request field.
In the embodiment of the invention, further defined the denotable request type of expansion Request field, cited association requests type can be referring to table two.
| Request type | The implication explanation |
| 10100 | Lockout ofProtection is abbreviated as LP, locking protection passage. |
| 10011 | Signal Fail (Protection) is abbreviated as SF-P, protection passage SF. |
| 10010 | Forced Switch (Near) is abbreviated as FS_N, near side (ns) FS. |
| 10001 | Forced Switch (Far) is abbreviated as FS_F, distal edge FS. |
| 10000 | Signal Fail (Near, W SF and P SD) is abbreviated as SF-N-W, near side (ns) SF (service aisle SF protection passage SD). |
| 01111 | SignalFail (Near) is abbreviated as SF-N, near side (ns) SF (service aisle SF). |
| 01110 | Signal Fail (Far, W SF and P SF) is abbreviated as SF-F-WP, distal edge SF (service aisle SF protection passage SF). |
| 01101 | Signal Fail (Far, W SD and P SF) is abbreviated as SF-F-P, distal edge SF (service aisle SD protection passage SF). |
| 01100 | Signal Fail (Far, W SF and P SD) is abbreviated as SF-F-W, distal edge SF (service aisle SF protection passage SD). |
| 01011 | Signal Degrade (Protection) is abbreviated as SD-P, protection passage SD. |
| 01010 | Signal Degrade (Near) is abbreviated as SD-N, near side (ns) SD. |
| 01001 | Signal Degrade (Far) is abbreviated as SD-F, distal edge SD. |
| 01000 | Manual Switch (Near) is abbreviated as MS-N, the near side (ns) Manual Switch. |
| 00111 | Manual Switch (Far) is abbreviated as MS-F, the distal edge Manual Switch. |
| 00110 | Wait-To-Restore (Near) is abbreviated as WTR_N, the near side (ns) Wait-to-Restore. |
| 00101 | Wait-To-Restore (Far) is abbreviated as WTR_F, the distal edge Wait-to-Restore. |
| 00100 | Exerciser (Near) is abbreviated as EXER-N, the near side (ns) Exercise Switching. |
| 00011 | Exerciser (Far) is abbreviated as EXER-F, the distal edge Exercise Switching. |
| 00010 | Reverse Request (near) is abbreviated as RR_N, the near side (ns) reverse request. |
| 00001 | Reverse Request (far) is abbreviated as RR_F, the distal edge reverse request. |
| 00000 | No Request does not have request. |
Table two
In the table two, request type embodies the priority that the receiving end that receives message is handled this request, and request type is arranged from high to low by this priority.In the table two, the indication of switching of expansion Request field correspondence comprises: " 10100 " indication request locking protection passage; " 10011 " indication protection passage SF; " 10010 " indication request forces near-end to be switched, and promptly forces near-end to be switched; " 10001 " indication request forces far-end to be switched, and promptly forces far-end to be switched; " 10000 " indication service aisle SF, and with the protection passage SD of section, the request near-end is switched; " 01111 " indication service aisle SF, the request near-end is switched; " 01110 " indication service aisle SF, and with the protection passage SF of section, the request far-end is switched; " 01101 " indication service aisle SD, and with the protection passage SF of section, the request far-end is switched; " 01100 " indication service aisle SF, and with the protection passage SD of section, the request far-end is switched; " 01011 " indication protection passage SD; " 01010 " indication near side (ns) service aisle SD, i.e. section service aisle SD; " 01001 " indication distal edge service aisle SD promptly encircles service aisle SD; " 01000 " indication request near side (ns) Manual Switch, promptly artificial near-end is switched; " 00111 " indication request distal edge Manual Switch, promptly artificial far-end is switched; " 00110 " indication request is waited near side (ns) protection routing restoration; " 00101 " indication request is waited for distal edge protection routing restoration; " 00100 " indication request exercise near-end is switched; " 00011 " indication request exercise far-end is switched; " 00010 " indicates this message is the near side (ns) reverse request, i.e. near side (ns) response; " 00001 " indicates this message is the distal edge reverse request, i.e. distal edge response; " 00000 " indication does not have request, and promptly service aisle or protection channel status are normal.
The type of message that the expansion Request field of available 5bits is represented is not limited to the cited example of above-mentioned table two, and, in the practical application, the value and the corresponding implication of expansion Request field can be set as required.
In addition, referring to Fig. 7, Fig. 7 is the APS byte structure schematic diagram in the embodiment of the invention.Based on expansion Request field, denotable request type is abundanter; Correspondingly, be used for the N field that indicating remote is switched or near-end is switched in the existing APS byte and can continue to be used, also can be the saving bit number, and abandon using; Use if abandon, then be equivalent to not employ the reservation bit number, but by readjusting the mode of using bit number, make that the APS byte structure in the embodiment of the invention can be indicated more request type, thereby the APS byte structure that embodies in the embodiment of the invention is better than existing APS byte structure.
Referring to Fig. 8, Fig. 8 is the self-healing protection method flow chart of the optical-fiber network that provides of the embodiment of the invention, and this flow process can may further comprise the steps:
On step 801, the optical-fiber network self-healed protection ring; switch the service aisle inefficacy SF of originating end at bearer service; and under the protection passage situation about can work, generating professional relevant switching request message, the indication of switching that near-end switches is carried out in the request of carrying of this switching request message.Protection passage situation about can work comprises that the protection channel status is normal, or protection channel signal deterioration or the like, so long as the situation that can be used to communicate by letter still.
Step 802, the described originating end of switching mail to described switching request message and switch responder.
Referring to Fig. 9, Fig. 9 is the self-healing protection method flow chart of the another kind of optical-fiber network that provides of the embodiment of the invention, and this flow process can may further comprise the steps:
Step 901, switch responder and receive switching request message; Described switching request message is carried at the service aisle SF of bearer service on the optical-fiber network self-healed protection ring, and under the situation that corresponding protection passage can be worked, and the indication of switching that near-end switches is carried out in request.
In the embodiment of the invention, switching indication is embodied by controlled APS byte, can comprise above-mentioned expansion Request field in controlled APS byte, this expansion Request field correspondence switch the indication example can be referring to table one, in the practical application, the indication of switching of expansion Request field correspondence also can be set voluntarily, with refinement switching request type.
In addition, the prompting of the APS byte structure shown in Figure 7 that provides according to the embodiment of the invention is in the practical application, also can not expand the Request field, but by readjusting other fields, or, also can play the effect of refinement switching request type in conjunction with enabling reserved field.
Compare and adjust other fields; expansion Request field can embody the switching request type of refinement more; therefore, the embodiment of the invention is an example with expansion Request field, illustrates how to protect business based on the switching request message of the APS byte that comprises expansion Request field.
Referring to Figure 10, Figure 10 is the structural representation of switching apparatus for initiating in a kind of optical-fiber network of providing of the embodiment of the invention.Switching apparatus for initiating and can be set at and switch originating end in the optical-fiber network shown in Figure 10.Among Figure 10, switching originating end can comprise: generation unit and transmitting element;
Generation unit, the service aisle SF of bearer service on optical-fiber network self-healed protection ring, and under the situation that corresponding protection passage can be worked, generate professional relevant switching request message, the indication of switching that near-end switches is carried out in the request of carrying of this switching request message;
Transmitting element, the described switching request message that described generation unit is generated sends.
Referring to Figure 11, Figure 11 is the structural representation of switching responding device in a kind of optical-fiber network of providing of the embodiment of the invention.Switching responding device and can be set at and switch responder in the optical-fiber network shown in Figure 11.This is switched responder and can comprise: first receiving element and first processing unit; Wherein,
First receiving element receives switching request message; Described switching request message is carried at the service aisle SF of bearer service on the optical-fiber network self-healed protection ring, and under the situation that corresponding protection passage can be worked, and the indication of switching that near-end switches is carried out in request;
First processing unit is switched indication according to described, carries out near-end and switches.
The embodiment of the invention also provides the self-healing protection method of another optical-fiber network.Referring to Figure 12, Figure 12 is the self-healing protection method flow chart of this optical-fiber network, and this flow process can may further comprise the steps:
Referring to Figure 13, Figure 13 is the structural representation of switching responding device in another optical-fiber network of providing of the embodiment of the invention, the responding device of switching in this optical-fiber network is set at and switches responder, can comprise: second receiving element, comparing unit and second processing unit; Wherein,
Second receiving element receives first and switches the first professional first relevant switching request message that originating end sends, and second switches the second professional second relevant switching request message that originating end sends;
Comparing unit, the first switching request message, first second priority of switching indication of switching that indication and the second switching request message carries of carrying relatively, determine preferential execution priority higher switch indication;
Second processing unit, according to processing priority higher switch indication, the service aisle SF of bearer service on optical-fiber network self-healed protection ring, and under the situation that corresponding protection passage can be worked, carry out near-end and switch.
In the embodiment of the invention; on the same node on the guard ring; promptly can only be provided with the above-mentioned apparatus for initiating of switching that the embodiment of the invention provides, also can only be provided with the responding device of switching that the embodiment of the invention provides, also can not only be provided with to switch apparatus for initiating but also be provided with and switch responding device.
Describe the technical scheme that the embodiment of the invention provided in detail below in conjunction with specific embodiment.
Embodiment one:
Still referring to Fig. 5, business scenario shown in Figure 5 is that prior art institute is reluctant, but adopts the technical scheme that the embodiment of the invention provided, and can make professional 2 to be protected.
Among Fig. 5, " #1 " detects the service aisle and the equal SF of protection passage of " #2 " sensing " #1 ", therefore, on professional 1 pairing section, there is not available protection passage, " #1 " generates professional 1 relevant switching request message as switching originating end, is example with table two, in this message that " #1 " generated, expansion Request field value is " 01110 "; " #3 " can receive professional 1 relevant switching request message.If " #4 " detects the service aisle SF of " #3 " sensing " #4 ", protection passage SD with section, on the then professional 2 pairing sections, remain at available protection passage, therefore, in the embodiment of the invention, because the Request field has been done expansion, " #4 " can be based on expansion Request field, the switching request message that the business 2 that generation indication request near-end is switched is correlated with, in this message, expansion Request field value is " 10000 ", and " #4 " sends to " #3 " with the switching request message that generates; " #3 " is after receiving the professional 1 switching request message of the being correlated with switching request message relevant with professional 2, in the professional 2 switching request message of being correlated with, expansion Request field value is " 10000 ", in the professional 1 switching request message of being correlated with, expansion Request field value is " 01110 ", determine that the relevant switching request message of the higher business of processing priority 2 is pairing and switch indication, be that near-end is switched, switch indication and the switching request message that the relatively low business of processing priority 1 is not relevant is pairing, promptly far-end is switched.Therefore; switch negotiation between " #3 " and " #4 "; " #3 " is by pointing to the protection passage of " #4 "; send response message to " #4 "; the most professional 2 relevant information are passed through the segment protection channel transfer between " #3 " and " #4 "; thereby, make professional 2 to be protected to a certain extent.
In the practical application; if professional 1 relatively professional 2 than the important level height; " #2 " also can send indication request forces switching request message that far-end switches to " #3 "; with table two is example; in this message, expansion Request field value be " 10001 ", and the processing priority of switching indication of this value correspondence is higher than to be expanded Request field correspondence in the professional 2 relevant switching request message and switch indication; thereby the far-end that can make business 1 is switched and is obtained carrying out, and the corresponding business 1 that makes preferentially is protected.
In the foregoing description one; switch originating end based on expansion Request field; can select more suitable request type; embody the professional switchover mode that is fit to; thereby under this transfer resource condition of limited of protection passage,, adopt near-end to switch for switching the business that is protected by near-end as far as possible; increase the professional possibility that is protected, guarantee professional normal operation as far as possible.
Embodiment two:
Referring to Fig. 6, business scenario shown in Figure 6 is that prior art institute is reluctant.But adopt the technical scheme that the embodiment of the invention provided, can make professional 1 and professional 2 all can be protected.
Among Fig. 6; " #1 " detects the service aisle SF of " #2 " sensing " #1 "; but the protection passage does not have disabled status; the switching request message that the business 1 that " #1 " meeting is switched to " #2 " transmission indication request near-end is correlated with; with table two is example; in this message that " #1 " generated; expansion Request field value is " 01111 "; after " #2 " receives this message; switch negotiation with " #1 ", can send detection information, after receiving that " #1 " returns really provisioning response by the protection passage that points to " #1 "; by with " #1 " between the relevant information of segment protection channel transfer professional 1, business 1 is protected." #3 " detects the service aisle SF of " #4 " sensing " #3 "; protection passage SD; then " #3 " can be based on the expansion Request field in the embodiment of the invention; generation is used to indicate the relevant switching request message of business that near-end switches 2; and can't be as prior art, can only generate and be used for the switching request message that indicating remote is switched.In the switching request message that the business 2 that " #3 " generated is correlated with; expansion Request field value is " 10000 "; after " #4 " receives the switching request message that " #3 " send; by pointing to the protection passage of " #3 "; send response message to " #3 "; final by the relevant information of the segment protection channel transfer between " #4 " and " #3 " professional 2, thus business 2 also is protected.
In the present embodiment two; because the embodiment of the invention is expanded the Request field; therefore; switching originating end can be according to the state of each passage on the section; generate suitable switching request message,, adopt near-end to switch as far as possible adopting near-end to switch under the professional situation of protection; and avoid adopting far-end to switch, reduce and switch the possibility that can't realize and cause business to be protected.
Embodiment three:
Referring to Figure 14, Figure 14 is present embodiment three handled network scenarios schematic diagrames.Among Figure 14, " #1 " detects the service aisle SD of " #2 " sensing " #1 ", and protection passage SF; " #3 " detects the service aisle SF of " #4 " sensing " #3 ", and protection passage SD.Then according to prior art; the switching request message that the business 1 that " #1 " meeting generation indication request far-end is switched is correlated with; " #3 " also can generate the relevant switching request message of business that the indication request far-end switches 2; make and the switching request that a plurality of indication request far-ends are switched to occur on the guard ring; and two equal indicating remote switching request of switching request; therefore also can not distinguish on priority, professional 1 and professional 2 all can't be protected.
If adopt the technical scheme of the embodiment of the invention, business 2 among Figure 14 is protected, be implemented as follows: " #1 " is behind the service aisle SD that detects " #2 " to " #1 ", protection passage SF, generate the relevant switching request message of business that the indication request far-end switches 1 based on expansion Request field, with table two is example, in this switching request message, expansion Request field value is " 01101 "; After " #2 " received the relevant switching request message of business that " #1 " send 1, continuing to send expansion Request field value to " #3 " be the switching request message that the business 1 of " 01101 " is correlated with; After " #3 " receives professional 1 relevant switching request message, also can continue to send expansion Request field value and be the relevant switching request message of the business 1 of " 01101 " to next node " #4 "; Then also detect service aisle SF, the protection passage SD of " #4 " to " #3 " as " #3 "; can be based on expansion Request field; the switching request message that the business 2 that generation indication request near-end is switched is correlated with; and should business 2 relevant switching messages send to " #4 "; with table two is example; in this message, expansion Request field value is " 10000 "." #4 " can receive two switching request message, wherein the expansion Request field value of the professional 2 switching request message of being correlated with is " 10000 ", the expansion Request field value of the professional 1 switching request message of being correlated with is " 01101 " in addition, with table two is example, because the processing priority that expansion Request field value is switched indication for " 10000 " correspondence is higher than expansion Request field value is switched indication for " 01101 " correspondence processing priority, therefore, " #4 " determines to handle expansion Request field value and switches indication for " 10000 " correspondence, do not switch indication and do not handle expansion Request field value for " 01101 " correspondence; Switch negotiation between " #4 " and " #3 ", the segment protection passage between professional 2 usefulness " #4 " and " #3 " is protected, thereby the quality of service of business 2 is improved, and professional 1 quality of service maintains the original state.
In the present embodiment three; professional 1 quality of service does not improve; and in fact; switch even professional 1 can carry out far-end by its corresponding distal edge protection passage; be switched on the protection passage; but because the protection passage SD of " #4 " sensing " #3 ", professional 1 quality of service can not improve.
Embodiment four:
Referring to Figure 15, Figure 15 is present embodiment four handled business scenario schematic diagrames.Among Figure 15, " #1 " detects the service aisle SF of " #2 " sensing " #1 ", and protection passage SD; " #3 " detects the service aisle SF of " #4 " sensing " #3 ", and protection passage SD.Then according to prior art; the switching request message that the business 1 that " #1 " meeting generation indication request far-end is switched is correlated with; " #3 " also can generate the relevant switching request message of business that the indication request far-end switches 2; and two equal indicating remote switching request of switching request; on priority, also can not distinguish, consequently professional 1 and professional 2 all can not get protection.
If adopt the technical scheme of the embodiment of the invention, then can make professional 1 and professional 2 all can be protected.Be implemented as follows: " #1 " is at the service aisle SF that detects " #2 " sensing " #1 ", and behind the protection passage SD, can generate the relevant switching request message of business that the indication request near-end switches 1 based on expansion Request field, in this switching request message, expansion Request field value is " 10000 "; After " #2 " receives the switching request message that " #1 " send; respond this request; and and switch negotiation between " #1 "; after consulting successfully; professional 1 relevant information is transmitted by the protection passage between " #2 " and " #1 "; thereby make professional 1 to be protected, improve professional 1 quality of service." #3 " detects the service aisle SF of " #4 " sensing " #3 "; and protection passage SD; therefore; can be based on expansion Request field; the switching request message that the business 2 that generation indication request near-end is switched is correlated with; and this message is sent to " #4 ", and in this message, expansion Request field value is " 10000 ".After " #4 " receives this switching request message; and switch negotiation between " #3 ", consult successfully after, professional 2 relevant information are transmitted by the protection passage between " #4 " and " #3 "; thereby make professional 2 to be protected, improve professional 2 quality of service.
Therefore, in the present embodiment four, because the sender of switching request can be based on expansion Request field; generation is suitable for the switching request message of service protection; under the situation that as far as possible can ask near-end to be switched, the request near-end is switched, and increases the professional possibility that is protected.
Embodiment five:
Referring to Figure 16, Figure 16 is present embodiment five handled business scenario schematic diagrames.Among Figure 16, " #1 " detects the service aisle SF of " #2 " sensing " #1 ", and protection passage SD; " #3 " detects the protection passage SD of " #4 " sensing " #3 ".
Then according to prior art, the switching request message that the business 1 that " #1 " meeting transmission indication request far-end is switched is correlated with after " #2 " receives this message, continues to send the switching request message that business 1 is correlated with to " #3 "; After " #3 " receives the professional 1 switching request message of being correlated with, also can continue to send professional 1 relevant switching request message to " #4 "; And " #3 " can send professional 2 relevant switching request message to " #4 ", the relevant protection of indication passage SD.After " #4 " receives switching request message and notification message,, then determine to handle switching request message, realize professional 1 far-end is switched according to the processing priority of switching request message processing priority height than notification message.And after far-end switched, because the protection passage SD of " #4 " sensings " #3 ", therefore, in fact the quality of service of business 1 did not improve, and switched the protection passage that takies on the guard ring because of far-end, wasted transfer resource on the contrary.
Adopt the technical scheme of the embodiment of the invention, then can make professional 1 to switch by near-end and to be protected, and not waste this transfer resource of protection passage.Be implemented as follows: " #1 " is at the service aisle SF that detects " #2 " sensing " #1 ", and behind the protection passage SD, generate the relevant switching request message of business that the indication request near-end switches 1 based on expansion Request field, in this switching request message, expansion Request field value is " 10000 "; After " #2 " receives the switching request message that " #1 " send, directly switch negotiation with " #1 ", the relevant information with professional 1 sends to " #1 " by the protection passage of sensing " #1 ".
In the present embodiment five, " #3 " also can send a notification message to " #4 ", the relevant protection of indication passage SD.With table two is example, and in this notification message, expansion Request field value is " 01011 ".This notification message is mainly used in the relevant protection of each node passage SD on the notice guard ring.In the present embodiment five, professional 1 switch do not influence professional 2 normal operation.
Embodiment six:
Referring to Figure 17, Figure 17 is present embodiment six handled business scenario schematic diagrames.Among Figure 17, " #1 " detects the service aisle SF of " #2 " sensing " #1 ", and protection passage SD; " #3 " detects the service aisle and the equal SD of protection passage of " #4 " sensing " #3 ".
According to prior art, the switching request message that the business 1 that " #1 " meeting generation indication request far-end is switched is correlated with after " #2 " receives this message, can continue to send the professional 1 switching request message of being correlated with to " #3 "; After " #3 " receives the professional 1 switching request message of being correlated with, also can continue to send professional 1 relevant switching request message to " #4 ".Because service aisle of " #4 " sensing " #3 " and the equal SD of protection passage, therefore, " #3 " also can send two notification messages to " #4 ", the relevant protection of a notice indication passage SD, another notice indication related work passage SD.After " #4 " receives switching request message and notification message,, then determine to handle switching request message, realize the far-end of business 1 is switched according to the processing priority height that the processing priority ratio of switching request message is notified.And after far-end switched, because the protection passage SD of " #4 " sensings " #3 ", therefore, in fact the quality of service of business 1 did not improve, and switched the protection passage that takies on the guard ring because of far-end, wasted transfer resource on the contrary.
Adopt the technical scheme of the embodiment of the invention, then can make professional 1 to switch by near-end and to be protected, and not waste the transfer resource of protection passage.Specific implementation can repeat no more referring to the related description in the foregoing description five.
Required being noted that; the technical scheme that the embodiment of the invention provides; based on adjustment to existing APS byte structure; make controlled APS byte can indicate the switching request of more refinement; when adopting the APS technology to improve the self-healing ability of optical-fiber network; switching originating end can be according to the break-make situation of each service aisle in the optical-fiber network with the protection passage; based on controlled APS; initiatively initiate the suitable switching request that can as far as possible protect business; make and switch responder and can handle this switching request, and corresponding protection is professional.In addition, in the practical application, controlled APS byte that can provide based on the embodiment of the invention is used multiple switching strategy, realizes the protection to each business on the optical network protection ring.Said switching strategy can be those skilled in the art according on the optical network protection ring, the break-make situation of each service aisle or protection passage and the service protection strategy formulated as under which kind of situation, is initiated which kind of switching request or the like.And based on the technical scheme that the embodiment of the invention provided, those skilled in the art can dispose switching strategy more easily.
Of particular note, embodiments of the invention are that example describes with the Request field of expansion APS byte all.Yet; one of ordinary skill in the art will be appreciated that; this be for convenience of description a kind of and do for example; can not expansion Request field in actual applications; even can not be to send the APS byte but otherwise transmit switching request message, but, the switching request message that sends promptly belongs to protection scope of the present invention as long as having with its identical functions.
Simultaneously, all break down simultaneously in the embodiment of the invention and give an example with two sections, in other embodiments when fault be three when above, can switch processing based on the method for judgement priority of the present invention equally, because method and embodiment of the invention basically identical, in order to reduce length, in specification, no longer describe in detail.
In sum; when embodiment of the invention network element receives two or more switching request message; read the indication of switching of carrying in the switching request message; compare the entrained priority of switching indication of switching request message; according to priority the highest switch indication and carry out near-end and switch; so that the business on the guard ring can be protected as far as possible, improved the self-healing ability of optical-fiber network.
Claims (10)
1, a kind of self-healing protection method of optical-fiber network is characterized in that, comprising:
Network element receives two or more switching request message, reads the indication of switching of carrying in each switching request message, and relatively each switches the indication corresponding priorities;
Switch indication corresponding priorities difference according to each; preferential execution priority is higher switches indication; and this switches the service aisle SF that is designated as bearer service on optical-fiber network self-healed protection ring, and under the situation that corresponding protection passage can be worked, carries out near-end and switch.
2, method according to claim 1 is characterized in that, described network element receives the first switching request message and the second switching request message,
In the described first switching request message, first switches and is designated as: the first professional corresponding section service aisle Signal Fail SF, and during segment protection passage SF, request is carried out far-end and is switched;
In the described second switching request message, second switches and is designated as: the service aisle Signal Fail SF of the second professional corresponding section, and during segment protection channel signal deterioration SD, request is carried out near-end and is switched;
Described second switches indication priority is higher than first and switches indication.
3, method according to claim 1 is characterized in that, described network element receives the first switching request message and the second switching request message,
In the described first switching request message, first switches and is designated as: the first professional corresponding segment protection passage SD, and switching request is the notice of this segment protection passage SD;
In the described second switching request message, second switches and is designated as: the second professional corresponding section service aisle SF, and segment protection passage SD, and request is carried out near-end and is switched;
Be higher than described first priority of switching indication according to described second priority of switching indication, determine to carry out described second and switch indication.
4, method according to claim 1 is characterized in that:
Describedly switch indication and carry by controlled APS APS byte.
5, method according to claim 1 is characterized in that:
Describedly switch indication by in described controlled APS byte, the Request field that accounts at least 5 bits is represented.
6, method according to claim 1 is characterized in that:
Described priority is determined by the important level of the business of switching fault level and need switch.
7, a kind of self-healing protection method of optical-fiber network is characterized in that, comprising:
On the optical-fiber network self-healed protection ring, switch the service aisle inefficacy SF of originating end at bearer service, and under the protection passage situation about can work, generate professional relevant switching request message, the indication of switching that near-end switches is carried out in the request of carrying of this switching request message;
The described originating end of switching mails to described switching request message and switches responder.
8, switch apparatus for initiating in a kind of optical-fiber network, it is characterized in that, comprising:
Generation unit, the service aisle SF of bearer service on optical-fiber network self-healed protection ring, and under the situation that corresponding protection passage can be worked, generate professional relevant switching request message, the indication of switching that near-end switches is carried out in the request of carrying of this switching request message;
Transmitting element, the described switching request message that described generation unit is generated sends.
9, switch responding device in a kind of optical-fiber network, it is characterized in that, comprising:
First receiving element receives switching request message; Described switching request message is carried at the service aisle SF of bearer service on the optical-fiber network self-healed protection ring, and under the situation that corresponding protection passage can be worked, and the indication of switching that near-end switches is carried out in request;
First processing unit is switched indication according to described, carries out near-end and switches.
10, switch responding device in a kind of optical-fiber network, it is characterized in that, comprising:
Second receiving element receives first and switches the first professional first relevant switching request message that originating end sends, and second switches the second professional second relevant switching request message that originating end sends;
Comparing unit, the first switching request message, first second priority of switching indication of switching that indication and the second switching request message carries of carrying relatively, determine preferential execution priority higher switch indication;
Second processing unit, according to processing priority higher switch indication, the service aisle SF of bearer service on optical-fiber network self-healed protection ring, and under the situation that corresponding protection passage can be worked, carry out near-end and switch.
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| CNA2007101952187A CN101453264A (en) | 2007-12-04 | 2007-12-04 | Self-healing protection method and apparatus for optical network |
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| CNA2007101952187A CN101453264A (en) | 2007-12-04 | 2007-12-04 | Self-healing protection method and apparatus for optical network |
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| CN101702658B (en) * | 2009-11-24 | 2012-09-05 | 中兴通讯股份有限公司 | Implement method of ring network protection and system thereof |
| CN102739441A (en) * | 2012-06-05 | 2012-10-17 | 中兴通讯股份有限公司 | Method for occupying protected resources by services in share protection and node |
| WO2012167490A1 (en) * | 2011-07-28 | 2012-12-13 | 华为技术有限公司 | Channel group protection method, system and node device |
| WO2018045863A1 (en) * | 2016-09-06 | 2018-03-15 | 中兴通讯股份有限公司 | Ring network switching protection method, apparatus and system |
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