CN100396045C - Optical transmission network protection method - Google Patents
Optical transmission network protection method Download PDFInfo
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- CN100396045C CN100396045C CNB2005100019600A CN200510001960A CN100396045C CN 100396045 C CN100396045 C CN 100396045C CN B2005100019600 A CNB2005100019600 A CN B2005100019600A CN 200510001960 A CN200510001960 A CN 200510001960A CN 100396045 C CN100396045 C CN 100396045C
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- protection group
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Abstract
The present invention relates to an optical transmission network protection method, which is characterized in that the method comprises the following steps that (a) a net element protection group is initialized; (b) whether the initialization is caused by the normal restoration of the net element protection group is judged; if true, the step (c) is carried out, and if false, the step d is carried out; (c) the normal state of a state machine of the net element protection group is carried out; (d) the state of a corresponding state machine is carried out according to the request information of the opposite terminal of the net element protection group. The present invention can effectively avoid the problem of service interruption caused by the asynchrony of protocol state machines at both ends of a protected field caused by the software or hardware reset or single plate reversing of net elements at one end or two ends in the protected field in the state of reversing by extending the protocol state machine protecting reversing.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of guard method of optical transport network.
Technical background
Regulation as the international standard suggestion; the APS of optical transmission network element (Auto Protection Switching) protection realizes by protection group and protection agreement thereof, as the multiplex section protection of step number word series (SDH) and the VP Ring of asynchronous transfer mode (ATM).The principle of SDH linear multiplex section protection and ATM VP Ring is basic identical, main not same be the information definition difference of K1, K2 protocol byte, the 2nd, the K1 of Linear multiplex section, K2 byte are carried on expense, and the K1 of ATM, K2 are carried on the APS cell.Be that example is introduced below with ATM.
The business of ATM is divided virtual path (VP Virtual Path) to connect on transmission network and is connected with Virtual Channel (VCVirtual Channel), and the protection of corresponding service also has VP Ring and VC Ring.ITU-TRecommendation I.630 (ATM protection switching) A.2.1.3states in stipulated the state of several protections: normal state (NR No Request); Wait-to-Restore attitude (WTR Wait-to-restore); do not recover attitude (DNR Do Not Revert); add delay attitude (HO Hold-off) attitude of switching attitude (SW Switched) and 5.7Hold-offfunction in ATM survivability escalation regulation; should be two stable state (NR; SW) and two transient state (HO; WTR), wherein DNR is a kind of mode under the SW attitude.
Constitute protected field between the network element that two are disposed the protection relation in the network.Between two transmission network elements at protected field two ends, agreement is undertaken by the K byte of ATM APS (APS, Auto Protection Switching) cell synchronously.Detect loss of cell delimitation (LCD, Loss of Cell Delineation) alarm indication signal (AIS Alarm Indication Signal) and switch the drive end that the network element of condition can be switched as APS, the Partner that then switch for APS the opposite end.The migration of APS drive end protection group state be two stable states (NR, SW) and two transient state (HO carries out between WTR), and APS Partner protection group only receives after the other side's the request that (NR switches between SW) two stable states.
It should be noted that APS switch drive end and Partner the role since the detected condition priority of switching different, both can exchange.
Transmission ATM network element provides the configuration of protection group and the setting that APS monitors passage, in the protected field that has disposed the protection relation, carries out state synchronized by the K byte between two network elements.Following is the structure of protection group:
The protection group:
The condition of switching is only monitoring that passage detects, and when needs were switched, protections all in the protection group were to action together.
As shown in Figures 1 and 2, be the state transition diagram that APS switches the protection group in the prior art, wherein, Fig. 1 is the state transition diagram of APS drive end, Fig. 2 is the state transition diagram of APS Partner.
In existing scheme, the protection group initially all rests on the NR state.Reset at network element software, after the hardware reset, ATM board switchover, the protection group can be carried out initialization, the right practical business of each protection must operate in work and connects in the protection group.
Because the limitation of state machine in the prior art, the protection group initially all is in the NR state, and business initial all is to operate in work to connect, and then is difficult to handle under following unusual situation, and may causes professional interruption:
1) resets at next end network element software of switch status;
The state machine of network element protection group enters the NR attitude automatically, and practical business operates in the right protection connection of protection, and it is just correct that state should be in the SW attitude.The confusion of state machine directly causes the follow-up switching action can not correct execution;
2) at next end network element hardware reset of switch status;
Hardware reset also can cause restarting of software, and the state machine of protection group enters the NR attitude automatically, and to the configuration of hardware issuing service, service operation is connected in work, and real protection group state should be in the SW attitude, and service operation connects just correct in the right protection of protection.The confusion of state machine directly causes the state on protected field both sides inconsistent and cause professional long-term interruption;
3) at next end network element generation device level board switchover of switch status;
Under the active and standby situation of veneer 1+1, the work of slave board connects, protection connects does not actually have service operation, and the state machine of backup protection group is difficult to the state machine of mainboard synchronously on the slave board, and slave board protection group state machine is in the NR state; After veneer 1+1 masterslave switchover took place, the work that business switches on the slave board connected, and if this moment business switched, then cause the state on protected field both sides inconsistent and cause professional long-term interruption.
Summary of the invention
Purpose of the present invention is exactly to improve the protocol state machine of network element protection group in the optical transmission system; with the correct state request that receives local and opposite end; make the protection group state machine consistent with opposite end protection group state and practical business ruuning situation; can not correctly recover after the software protocol of avoiding under abnormal conditions protection to switch is resetting, avoid wrong recovering state to cause professional interruption and can not recover automatically.
For this reason, the present invention adopts following technical scheme:
A kind of guard method of optical transport network may further comprise the steps:
A, the initialization of network element protection group;
The APS APS information that b, reception opposite end network element send, described APS information comprises opposite end network element protection group present located state information;
C, judge whether that to be that network element protection group is normal recover the initialization that causes, if, enter steps d, if not, enter step e;
D, the normal state that enters network element protection group state machine;
The opposite end network element protection group present located state information that comprises in e, the APS information sent according to network element protection group opposite end network element enters with opposite end network element protection and organizes the identical state machine state of current state of living in.
Described step e further one of comprises the steps:
If the network element request of e1 opposite end is switched, then enter the attitude of switching that local state machine is organized in the network element protection;
If e2 opposite end network element is a normal state, then enter the normal state that local state machine is organized in the network element protection;
If e3 does not receive the request of opposite end network element, then enter the normal state that local state machine is organized in the network element protection.
Among the described step e3, the time threshold of a wait opposite end net element information is set also.
Described opposite end network element state information is switched cell transfer by the asynchronous transfer mode protection.
The present invention is by increasing a transient state WR (Wait Requst in the protect group protocol state machine; wait for request); the request of local and opposite end is waited in time-delay in this transient state; can correctly judge the state that the protect group protocol state machine should enter after restarting, thereby the state machine that effectively solves under the situations such as exceptional reset, board switchover recovers problem.
The present invention has increased a stable state for protocol state machine is controlled, and is not having service operation or is needing the people when stopping turning protocol, the protocol state machine of protection group is in stops attitude.
Description of drawings
Fig. 1 is the state transition diagram of APS drive end in the prior art;
Fig. 2 is the state transition diagram of APS Partner in the prior art;
Fig. 3 a to Fig. 3 c is that the ATM service protection is switched the processing mode schematic diagram in optical transport network;
Fig. 4 is the state machine diagram of Partner network element protection group of the present invention;
Fig. 5 is the state machine diagram of drive end network element protection group of the present invention.
Embodiment
Below in conjunction with Figure of description the specific embodiment of the present invention is described.
Present embodiment is that example is introduced with ATM, and the multiplex section protection of synchronous digital hierarchy is similarly handled.
The ATM service protection switch group in the processing mode in the optical transport network shown in Fig. 3 a, 3b, 3c, among those figure with 1: 1 unidirectional be example, the part that sends APS information is only embodied in reverse path.
This drive end network element and Partner network element carry out state synchronized by K1, the K2 byte of APS information.The condition that the drive end network element carries out auto switching detects, and when detecting blackout (LCD) or business fault (AIS) is arranged, carries out following operation:
S1: the drive end network element switches to the protection entity and receives professional;
S2: to Partner network element passback APS information, require the Partner network element to be switched to the protection entity from the work route;
S3: the Partner network element is received the switching request of opposite end network element, switches to the protection entity and sends professional.
Recover just often when the drive end network element detects work entity, carry out following operation:
S11: the drive end network element switches to work entity and receives professional;
S22: to Partner network element passback APS information, require the Partner network element to be switched to work entity from the protection route;
S33: the Partner network element is received the opposite end switching request, switches to work entity and sends professional.
The preamble that is formed in of ATM protection group has description, and the protection turning protocol state machine after the expansion such as Fig. 4 and shown in Figure 5, Fig. 4 are the protection group state machine schematic diagrames of Partner network element, and Fig. 5 is the protection group state machine schematic diagram of drive end network element.Wherein dotted portion is state and the migration of protection group between increase state and existing state that increases.Because the guard mode machine is when recovering, the state machine of opposite end is in operate as normal, and then this locality is as the Partner network element of APS.
The present invention can detect in system and judge, after switching, reset again restart or situation that veneer is switched under, the protection group can switch to correct state.For this reason, carry out the setting of following state machine:
In protocol state machine, add and stop attitude (T stop) and wait for request attitude (WR wait request), relevant processing such as Fig. 4 and shown in Figure 5.
Present embodiment is provided with a T (Stop) attitude at the initial condition place of protection group, does delaying of a state, after being provided with the supervision passage or manually starting the protection agreement, enters the NR attitude automatically, and this is the normal handling flow process;
If the protocol state machine that network element software resets, hardware reset, board switchover cause recovers, then enter the WR attitude.
Wait in the request attitude at this, the threshold value of a time of delay can be set, according to the network demand setting, such as the time-delay of carrying out for 5 seconds, in this time period, wait for the APS information that the opposite end network element sends, detect local warning information simultaneously, receive local alarm request.
Here, the opposite end also sends APS information with the frequency that sends an APS information in the identical time threshold;
In WR (waiting for request) attitude, if the opposite end request is switched, then this locality directly enters SW (switching) attitude; If the opposite end is NR (not having a request) attitude, then this locality directly enters the NR attitude;
In WR (wait for request) attitude, if do not receive the request of opposite end, perhaps the opposite end network element does not start, the opposite end is just at recovery after restoration, and after then the time-delay of setting-up time threshold value was arrived, this locality entered the NR attitude.
By expansion to ATM protection turning protocol state machine; the problem of service interruption of effectively having avoided one or both ends network element software, hardware reset or board switchover can cause in the protected field under switch status the protected field two ends asynchronous meeting of protocol state machine to cause; the protocol state machine that ATM protection is switched has that can take place switch status under behind software reset, hardware reset and the board switchover can safe self-healing, and guarantee that business occurs after switching can security recovery under the unusual situation.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (4)
1. the guard method of an optical transport network is characterized in that may further comprise the steps:
A, the initialization of network element protection group;
The APS APS information that b, reception opposite end network element send, described APS information comprises opposite end network element protection group present located state information;
C, judge whether that to be that network element protection group is normal recover the initialization that causes, if, enter steps d, if not, enter step e;
D, the normal state that enters network element protection group state machine;
The opposite end network element protection group present located state information that comprises in e, the APS information sent according to network element protection group opposite end network element enters with opposite end network element protection and organizes the identical state machine state of current state of living in.
2. guard method as claimed in claim 1 is characterized in that described step e, further one of comprises the steps:
If the network element request of e1 opposite end is switched, then enter the attitude of switching that local state machine is organized in the network element protection;
If e2 opposite end network element is a normal state, then enter the normal state that local state machine is organized in the network element protection;
If e3 does not receive the request of opposite end network element, then enter the normal state that local state machine is organized in the network element protection.
3. guard method as claimed in claim 2 is characterized in that among the described step e3, and a time threshold of waiting for opposite end network element state information also is set, and after the overtime threshold value, is considered as not receiving the opposite end request.
4. method as claimed in claim 3 is characterized in that described opposite end network element state information switches cell transfer by asynchronous transfer mode protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100019600A CN100396045C (en) | 2005-01-13 | 2005-01-13 | Optical transmission network protection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100019600A CN100396045C (en) | 2005-01-13 | 2005-01-13 | Optical transmission network protection method |
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| CN1805398A CN1805398A (en) | 2006-07-19 |
| CN100396045C true CN100396045C (en) | 2008-06-18 |
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| CNB2005100019600A Expired - Fee Related CN100396045C (en) | 2005-01-13 | 2005-01-13 | Optical transmission network protection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836729A (en) * | 2015-05-19 | 2015-08-12 | 瑞斯康达科技发展股份有限公司 | Linear protection switching method, PE (provider edge) equipment and linear protection switching system |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101667952B (en) * | 2009-09-29 | 2012-05-30 | 北京中煤矿山工程有限公司 | Scanning function design method of one-line bus monitoring module |
| CN111093125B (en) * | 2019-12-27 | 2021-11-02 | 瑞斯康达科技发展股份有限公司 | Method, device and storage medium for realizing trunk optical fiber protection of optical line terminal |
| CN112073342B (en) * | 2020-08-12 | 2023-06-16 | 成都华微电子科技股份有限公司 | Deadlock avoidance method for equalizer self-adaptive state machine |
| CN115065590B (en) * | 2022-06-28 | 2023-05-26 | 烽火通信科技股份有限公司 | Method and device for realizing linear protection of distributed dual-state machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295397A (en) * | 1999-11-04 | 2001-05-16 | 深圳市中兴通讯股份有限公司 | Automatically protected switching method and device in high rate SDH loop |
| EP1432178A2 (en) * | 2002-12-16 | 2004-06-23 | Alcatel | Signaling protocol and architecture for protection rings |
| CN1532688A (en) * | 2003-03-20 | 2004-09-29 | 华为技术有限公司 | Host software reset method |
-
2005
- 2005-01-13 CN CNB2005100019600A patent/CN100396045C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295397A (en) * | 1999-11-04 | 2001-05-16 | 深圳市中兴通讯股份有限公司 | Automatically protected switching method and device in high rate SDH loop |
| EP1432178A2 (en) * | 2002-12-16 | 2004-06-23 | Alcatel | Signaling protocol and architecture for protection rings |
| CN1532688A (en) * | 2003-03-20 | 2004-09-29 | 华为技术有限公司 | Host software reset method |
Non-Patent Citations (4)
| Title |
|---|
| SDH光传送网的保护倒换. 毛谦.光通信研究，第1-2期. 1994 |
| SDH光传送网的保护倒换. 毛谦.光通信研究，第1-2期. 1994 * |
| 全光网络中的APS协议及其实现. 王建全，方来付，顾畹仪，纪越峰.北京邮电大学学报，第23卷第4期. 2000 |
| 全光网络中的APS协议及其实现. 王建全，方来付，顾畹仪，纪越峰.北京邮电大学学报，第23卷第4期. 2000 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836729A (en) * | 2015-05-19 | 2015-08-12 | 瑞斯康达科技发展股份有限公司 | Linear protection switching method, PE (provider edge) equipment and linear protection switching system |
| CN104836729B (en) * | 2015-05-19 | 2018-09-11 | 瑞斯康达科技发展股份有限公司 | A kind of method of linear protection switching, PE equipment and system |
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| Publication number | Publication date |
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| CN1805398A (en) | 2006-07-19 |
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