CN100428728C - Multiplex section protective protocol realizing method - Google Patents
Multiplex section protective protocol realizing method Download PDFInfo
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- CN100428728C CN100428728C CNB2004100977893A CN200410097789A CN100428728C CN 100428728 C CN100428728 C CN 100428728C CN B2004100977893 A CNB2004100977893 A CN B2004100977893A CN 200410097789 A CN200410097789 A CN 200410097789A CN 100428728 C CN100428728 C CN 100428728C
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Abstract
The present invention relates to the multiplex section protection switch of a transmission system and discloses a multiplex section protective protocol realizing method which makes the multiplex section protection switch has the advantages of high reliability, short processing time and high response speed. In multiplex section protective protocol realizing method, erroneous k bytes are filtered, and short diameter k bytes which are verified to be effective and switching requests detected by a terminal are synthesized to ring switching requests; in order to avoid waiting the overtime of a timer, the ring switching requests can be initiated in advance.
Description
Technical field
The present invention relates to the multiplex section protection exchanging of transmission system, particularly the implementation method of multiplex section protection exchanging agreement.
Background technology
Synchronous digital hierarchy (Synchronous Digital Hierarchy is called for short " SDH ") technology can obtain develop rapidly and extensive use, and can be adopted by optical transmission system, and one of them important reasons is exactly its self-healed protection function.And multiplex section protection (Multiplex SectionProtection is called for short " MSP ") is a kind of salvo efficiently in various networking protections, also is one of most important salvo in the current optical transmission system.
(the International Telecommunication Union-Telecommunication Standardization Sector of international telecommunication union telecommunication standardization; be called for short " ITU-T ") in G.841 it advise; clearly defined the multiplex section protection exchanging agreement APS (Auto ProtectionSwitching is called for short " APS ") of transmission equipment.The agreement regulation; multiplex section protection exchanging is realized by k1 and the transmission of k2 byte; wherein preceding 4 bit tables of k1 byte are levied bridge request codes; back 4 bit tables are levied the destination node identification code; and preceding 4 bit tables of k2 byte are levied the source node identification code; the 5th bit table is levied short path or long path, and back 3 bit tables are levied the state of multiplex section protection exchanging.
Multiplex section protection exchanging can be divided into linearity and annular according to network construction form.Linear networking comprises two kinds of 1+1 and 1:N; Annular networking comprises two kinds of unidirectional multiplex section and two-direction duplexing section protections.
Linear multiplex section protection is a kind of special use or shared protection mechanism.It provides protection to the multiplex section layer, is applicable to the physical network of point-to-point.A multiplex section protection is used to protect the work multiplex section of some (n), but can not provide protection to node failure, and it can work in single-ended or the both-end mode, and multiplex section protection also can be used to open the extra traffic that need not to protect when idle condition in addition.
The service aisle transport service of Multiplex Section Shared Protection Ring, its protection passage then gives over to the usefulness of the protection of service signal, and Multiplex Section Shared Protection Ring need use the APS agreement, and its protection switch time is 50ms, is divided into two fine and four fine two kinds of protected modes.
Commonly used at present is the two-direction duplexing section protection.The multiplex section protection exchanging time is one of crucial parameter, according to ITU-T suggestion model G.841, is no more than under the situation of 1200km at the total length that encircles, and protection is switched and should finish multiplex section rearrangement in 50ms.How G.841 providing the rule of some multiplex section rearrangements by the form of switching rule in the suggestion, proposed some performance index that must reach simultaneously, but but clearly do not provide solution for realizing these rules and index.In actual engineering, once complete switching will be experienced four processes that fault recognition, the transmission of turning protocol byte, switch execution and circuit recover.Wherein the fault recognition time is relevant recovery time with the system of producer with switch time of implementation and circuit.
The prior art scheme all adopts multiplex section k byte to transmit the multiplex section agreement.The transmission of k byte relates generally to the multiplex section protocol processes, the communication of k byte between the different veneers of network element, and wiring board is to the break-through of k byte, sends and complicated process such as reception.The realization of this method has related to different different veneers, the communication between the disparate modules and the switching of task, and complicated communication transmission process makes the k byte be easy to damage in transport process and the situation of wrong k byte occurs.The k byte is made mistakes and will be made multiplex section protocol processes fault, has not only influenced the reliability of multiplex section rearrangement, agreement is missed switched; and may cause the vibration of agreement; produce a large amount of interruptions, make main frame and circuit board resetting, seriously influence the protection of regular traffic.
In addition; G.841 Rule S-S#4 is as follows to the overtime regulation of span switching: for a 4F Ring; when not having response or protection passage because of protection link deterioration or inefficacy non-availability because short path is overtime; make signal cracking section request (Signal Degrade-Span; be called for short " SD_S ") or Signal Fail section request (Signal Fail-Span; be called for short " SF_S ") when the bridge joint request can't be carried out, will initiate suitable ring switching.The prior art scheme to switching the overtime processing method of taking is: wait for the regular hour, if there is not the response of opposite end, initiate the ring switching request of response.Because want the overtime switching time that must make of waiting timer to prolong, traffic affecting is protected timely.
In actual applications, there is following problem in such scheme: the generation of wrong k byte causes the protocol processes fault in the k byte transmittance process, reduces reliability; And when the section request was lost efficacy, whether receive that according to timer expiry response determines whether initiating ring switching, reduce response speed.
Cause the main cause of this situation to be, the wrong k byte that receives is not carried out filtration treatment, cause the misoperation of agreement easily; The local terminal protection is sent out badly fine and is protected and receive under the fine good situation; the detected span switching request of local terminal can not be issued the opposite end by minor axis; therefore; the opposite end can not respond; initiate the ring switching request after can only waiting timer expiry; make multiplex section protocol processes complexity, the overtime prolongation switching time of waiting timer reduces response speed.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of the multiplex section protection protocol implementation method, makes that reliability height, the processing time of multiplex section protection exchanging is short, response speed is fast.For achieving the above object, the invention provides a kind of the multiplex section protection protocol implementation method, comprise following steps:
Network element judges whether the turning protocol byte that receives is wrong, if then abandon this turning protocol byte, otherwise network element is judged the whether section request k byte of minor axis of this turning protocol byte, if then this minor axis section request turning protocol byte and local detected switching request are synthesized, generate the ring switching request, and carry out protocol processes, otherwise directly carry out protocol processes according to turning protocol byte switching request according to this ring switching request.
Wherein, the condition of judging described turning protocol byte error can be a kind of in following each condition:
Request is protection channel failure or protection passage deterioration, and the mode bit of k2 is: bridge joint or bridge joint and switching;
Request is not for there being request, and the mode bit of k2 is: bridge joint and switching;
Request is oppositely ring request or backward section request, and the line of apsides indicating bit of k2 is a major diameter;
The mode bit of k2 be not far-end lost efficacy indication, bridge joint and switch, bridge joint, Idle state, extra traffic indication;
Request is for the request of Signal Fail ring switching, and the mode bit of k2 is: bridge joint;
Request is not have request, and is default turning protocol byte;
The major diameter of the turning protocol byte that the opposite end network element sends points to self;
Request is for Wait-to-Restore, and the mode bit of k2 is not: bridge joint and switching;
Destination node is pointed to the major diameter of self, and destination node is not equal to reverse adjacent segments period;
Destination node is pointed to the minor axis of oneself, and the purpose node is not equal to this to the adjacent segments period;
Request is the major diameter that sends of this node, and the purpose node number is not equal to reverse adjacent segments period;
Request is the minor axis that sends of this node, and the purpose node number is not equal to this to the adjacent segments period;
Request is span switching request or the backward section switching request that two fine rings are received.
When annular networking, also comprise following steps:
The minor axis request of local terminal request and opposite end transmission is synthesized the ring switching request.
In addition, can determine described ring switching request according to following steps:
If described local terminal request is the request of Signal Fail section, the described minor axis section request that the opposite end sends is that state is the protection channel failure that far-end lost efficacy and indicates, and then He Cheng described ring switching request is the request of Signal Fail ring switching;
If described local terminal request is the request of Signal Fail section, the described minor axis section request that the opposite end sends is a protection passage deterioration, and then He Cheng described ring switching request is the request of Signal Fail ring switching;
If described local terminal request is the request of signal cracking section, the described minor axis section request that the opposite end sends is that state is the protection channel failure that far-end lost efficacy and indicates, and then He Cheng described ring switching request is the request of Signal Fail ring switching;
If described local terminal request is the request of signal cracking section, the described minor axis section request that the opposite end sends is a protection passage deterioration, and then He Cheng described ring switching request is the request of Signal Degrade ring switching.
By relatively finding, technical scheme difference with the prior art of the present invention is, wrong k byte is filtered, and when span switching loses efficacy minor axis k byte and local terminal request is synthesized the ring switching request, avoid waiting timer overtime, judge the ring switching request of initiating in advance.
Difference on this technical scheme has brought comparatively significantly beneficial effect, and the filtration of promptly wrong k byte has improved the robustness and the reliability of multiplex section protection exchanging, judges in advance and initiates the ring switching request and shortened switching time and accelerated response speed.
Description of drawings
Fig. 1 is a multiplex section protocol processes flow chart according to an embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Multiplex section protocol processes flow process as shown in Figure 1, in step 110, network element receives new k byte.
After this enter step 120, this network element judges whether the k byte of receiving is effective, if then enter step 130, otherwise the k byte of mistake directly abandoned, and do not carry out protocol processes, process ends.
In step 130, network element is judged the whether minor axis span switching request of k byte, if then enter step 140, otherwise enters step 150.
In step 140, with the content and the synthetic ring switching request of local switching request of k byte.After this enter step 150.
In step 150, synthesize the final effective ring switching request of generation for minor axis k byte and local detected switching request that checking is correct, carry out protocol processes.In addition, if step 120 checking correct be the k byte switching request of major diameter or in the k byte switching request of the real correct minor axis of step 120 checking, but local do not detect the span switching request and do not need the situation of synthetic ring switching request in step 140, then to verifying that correct k byte directly carries out protocol processes.
The preprocessing process of protocol processes during for synthetic can regarding as of the filtration of k byte and correct minor axis k byte and local span switching request.
Among the present invention, at first provide filtration, guarantee the reliability of multiplex section agreement for wrong k byte.
In one embodiment of the invention, correctly handle the k byte in order to guarantee the APS protocol processor, at first provided wrong k byte under the various situations, and carried out the filtration of wrong k byte during for the k byte that receives, promptly these wrong k bytes have been disregarded directly abandoning according to standard.Correctness and reliability that like this can guarantee agreement be avoided the protocol processes fault that causes because of wrong k byte and are switched the waste in processing time.
In one embodiment of the invention, during 13 kinds of situations below occurring, in step 120, be judged as wrong k byte, and filter:
1. request is protection channel failure (Signal Fail of the Protection Channels, be called for short " SF_P ") or protection passage cracking (Signal Degrade of the Protection Channels, be called for short " SD_P "), but the mode bit of k2 is: bridge joint (Bridged, be called for short " Br ") or bridge joint and switch (Bridgedand Switched, be called for short " Br﹠amp; Sw ");
2. (No Request is called for short " NR ") do not asked in request for having, but the mode bit of k2 is: Br﹠amp; Sw;
3. request is oppositely ring request (Reverse Request-Ring is called for short " RR_R ") or backward section request (Reverse Request-Span is called for short " RR_S "), but the line of apsides indicating bit of k2 is a major diameter;
4.k2 mode bit be not lost efficacy indication (Remote Degrade Indication is called for short " RDI ") or Br﹠amp of far-end; Sw or Br or Idle state (IDLE), extra traffic indication (Extra Traffic is called for short " ET ");
5. request is Signal Fail ring switching request (Signal Fail-Ring is called for short " SF_R "), but the mode bit of k2 is: Br;
6. request is not equal to the default k byte of NR;
7. the k byte requests of the sensing oneself of the major diameter that sends of opposite end network element;
8. request is Wait-to-Restore (Wait to Restore is called for short " WTR "), but the mode bit of k2 is not: Br﹠amp; Sw;
9. destination node is pointed to the major diameter of oneself, and the purpose node is not equal to reverse adjacent segments period;
10. destination node is pointed to the minor axis of oneself, and the purpose node is not equal to this to the adjacent segments period;
11. the major diameter that this node sends, the purpose node number is not equal to reverse adjacent segments period;
12. the minor axis that this node sends, the purpose node number is not equal to this to the adjacent segments period;
13. two fine rings are received span switching request, perhaps backward section switching request.
Those of ordinary skill in the art are appreciated that wrong k byte is not limited to above-mentioned 13 kinds of k bytes, also filter for other k bytes that do not meet the agreement regulation, can realize goal of the invention, and not influence the spirit and scope of the invention.
Secondly, the invention provides the synthetic method of correct minor axis k byte of checking and local detected span switching request.
In another embodiment of the present invention, according to check in the top embodiment method is correct k byte, at local terminal is under the situation of span switching inefficacy, synthesize the ring switching request according to the correct minor axis k byte requests that proves that send the request and the opposite end of the detection of local terminal network element, can avoid the overtime and span switching request of waiting timer not response judge whether to initiate the ring switching request, can obviously improve response speed like this, shorten switching time.For the situation except that top described situation, justify k byte is directly carried out protocol processes.
In one embodiment of the invention, in step 140, synthesize the ring switching request respectively in following four kinds of situations:
If the request of local terminal network element is SF-S, receive that the minor axis k byte requests of the sensing oneself that the opposite end network element sends is SF-P (state is RDI), then He Cheng request is SF_R;
If the request of local terminal network element is SF-S, receive that the minor axis k byte requests of the sensing oneself that the opposite end network element sends is SD-P, then He Cheng request is SF_R;
If the request of local terminal network element is SD-S, receive that the minor axis k byte requests of the sensing oneself that the opposite end network element sends is SF-P (state is RDI), then He Cheng request is SF_R;
If the request of local terminal network element is SD-S, receive that the minor axis k byte requests of the sensing oneself that the opposite end network element sends is SD-P, then He Cheng request is Signal Degrade ring switching request (Signal Degrade-Ring is called for short " SD_R ").
According to above-mentioned rule the span switching request is synthesized the ring switching request, can find span switching request inefficacy in advance, and can accelerate the ring switching request and handle, make that switching response speed accelerates.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (6)
1. a multiplex section protection protocol implementation method is characterized in that, comprises following steps:
Network element judges whether the turning protocol byte that receives is wrong, if then abandon this turning protocol byte, otherwise network element is judged the whether section request k byte of minor axis of this turning protocol byte, if then the turning protocol byte and the local detected switching request of this minor axis section request are synthesized, generate the ring switching request, and carry out protocol processes, otherwise directly carry out protocol processes according to this turning protocol byte according to this ring switching request.
2. the multiplex section protection protocol implementation method according to claim 1 is characterized in that, the condition of judging described turning protocol byte error can be a kind of in following each condition:
Request is protection channel failure or protection passage deterioration, and the mode bit of the second turning protocol byte k2 is: bridge joint or bridge joint and switching;
Request is not for there being request, and the mode bit of k2 is: bridge joint and switching;
Request is oppositely ring request or backward section request, and the line of apsides indicating bit of k2 is a major diameter;
The mode bit of k2 be not far-end lost efficacy indication, bridge joint and switch, bridge joint, Idle state, extra traffic indication;
Request is for the request of Signal Fail ring switching, and the mode bit of k2 is: bridge joint;
Request is not have request, and is default turning protocol byte;
The major diameter of the turning protocol byte that the opposite end network element sends points to self;
Request is for Wait-to-Restore, and the mode bit of k2 is not: bridge joint and switching;
Destination node is pointed to the major diameter of self, and destination node is not equal to reverse adjacent segments period;
Destination node is pointed to the minor axis of oneself, and the purpose node is not equal to this to the adjacent segments period;
Request is the major diameter that sends of this node, and the purpose node number is not equal to reverse adjacent segments period;
Request is the minor axis that sends of this node, and the purpose node number is not equal to this to the adjacent segments period;
Request is span switching request or the backward section switching request that two fine rings are received.
3. the multiplex section protection protocol implementation method according to claim 1 and 2 is characterized in that, generates described ring switching request according to following steps:
If the detected switching request in described this locality is the request of Signal Fail section, the described minor axis section request that the opposite end sends is that state is the protection channel failure that far-end lost efficacy and indicates, and then He Cheng described ring switching request is the request of Signal Fail ring switching.
4. the multiplex section protection protocol implementation method according to claim 1 and 2 is characterized in that, generates described ring switching request according to following steps:
If the detected switching request in described this locality is the request of Signal Fail section, the described minor axis section request that the opposite end sends is a protection passage deterioration, and then He Cheng described ring switching request is the request of Signal Fail ring switching.
5. the multiplex section protection protocol implementation method according to claim 1 and 2 is characterized in that, generates described ring switching request according to following steps:
If the detected switching request in described this locality is the request of Signal Degrade section, the described minor axis section request that the opposite end sends is that state is the described protection channel failure that far-end lost efficacy and indicates, and then He Cheng described ring switching request is the request of Signal Fail ring switching.
6. the multiplex section protection protocol implementation method according to claim 1 and 2 is characterized in that, generates described ring switching request according to following steps:
If the detected switching request in described this locality is the request of Signal Degrade section, the described minor axis section request that the opposite end sends is a protection passage deterioration, and then He Cheng described ring switching request is the request of Signal Degrade ring switching.
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| CNB2004100977893A CN100428728C (en) | 2004-12-03 | 2004-12-03 | Multiplex section protective protocol realizing method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101141211B (en) * | 2007-02-27 | 2011-09-21 | 中兴通讯股份有限公司 | Device and method for guaranteeing multiplex section rearrangement consistency |
| CN102571391B (en) * | 2010-12-22 | 2014-12-10 | 中兴通讯股份有限公司 | Method and system for status synchronization of protection switching protocol |
| CN102098123B (en) * | 2011-02-28 | 2013-11-06 | 中国人民解放军理工大学 | Node addressing method for protection switching protocol of multiplex section shared protection ring |
| CN102611570A (en) * | 2011-12-30 | 2012-07-25 | Ut斯达康通讯有限公司 | Method for realizing port-level protection of packet transport network (PTN) by use of Y-shaped cable |
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| US20020087733A1 (en) * | 2000-11-02 | 2002-07-04 | Naokatsu Ohkawa | Message transfer method and apparatus |
| CN1422013A (en) * | 2001-11-30 | 2003-06-04 | 上海贝尔有限公司 | Automatic protecting switch controller for optical self-healing ring and its control method |
| CN1484391A (en) * | 2002-09-21 | 2004-03-24 | 深圳市中兴通讯股份有限公司 | Method for raising protective inversion reliability in multiplexing section of optical transmission circular network |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1281302A (en) * | 1999-07-15 | 2001-01-24 | 深圳市华为技术有限公司 | Protective reversing and detecting method of synchronously triggered multiplexing band under multiple securities mechanism |
| US20020087733A1 (en) * | 2000-11-02 | 2002-07-04 | Naokatsu Ohkawa | Message transfer method and apparatus |
| CN1422013A (en) * | 2001-11-30 | 2003-06-04 | 上海贝尔有限公司 | Automatic protecting switch controller for optical self-healing ring and its control method |
| CN1484391A (en) * | 2002-09-21 | 2004-03-24 | 深圳市中兴通讯股份有限公司 | Method for raising protective inversion reliability in multiplexing section of optical transmission circular network |
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Effective date of registration: 20170914 Address after: Qinyang City, Henan province 454550 Jiaozuo City office at Huaiqing Street No. 58 Patentee after: Yan Aiming Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: Huawei Technologies Co., Ltd. |
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