CN101951303B - A kind of method and node device realizing bidirectional linear protection switch of multiplex section - Google Patents
A kind of method and node device realizing bidirectional linear protection switch of multiplex section Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/14—Monitoring arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0057—Operations, administration and maintenance [OAM]
- H04J2203/006—Fault tolerance and recovery
Abstract
The invention provides a kind of method and the node device that realize bidirectional linear protection switch of multiplex section; the method comprises: after node device calculates the highest bridge joint request of protection in-group priority, carries out the bridge joint of the corresponding business of this bridge joint request and switch according to the first decision-making mode.The present invention is mutual by being reduced to three of protocol byte in reversed process times alternately once, and correspondingly the process such as decision-making also for once, and that greatly can improve the protection of multiplex section 1:N bidirectional linear switches efficiency.
Description
Technical field
The present invention relates to optical-fiber network technical field, particularly relate to a kind of method and the node device that realize bidirectional linear protection switch of multiplex section.
Background technology
At G.841 standard (SDH (SynchronousDigitalHierarchy; SDH (Synchronous Digital Hierarchy)) network protection structure) APS (AutomaticProtectionSwitched that specifies; APS) in agreement, the implementation that multiplex section 1:N bidirectional protective is switched is completed switched in strict accordance with 3-phase (between two nodes interaction protocol byte three times).When far-end request is the highest request, perform the bridge joint of far-end request signal, the working service signal that the K2 byte of reception is identical with the signal numbering instruction in the K1 byte of transmission, perform switching of this working service.As shown in Figure 1, the process of switching is completed according to 3-phase as follows:
Initial node device two ends all send NR0, the signaling (NR is without request, and request bridge joint signal and bridge joint signal are all 0) of 0.
When left end node device detects signal 2 deterioration, send SD2,0 (request opposite end bridge joint signal 2);
After right-hand member node device settling signal Bridge 2 connects, send RR2,2 (reverse request, request opposite end also bridge joint signal 2, and inform this side, opposite end settling signal Bridge 2 connect);
The bridge joint of left end node device settling signal 2 and switching, sends SD2,2 (notice opposite end settling signal Bridge 2 connects);
Right-hand member node device settling signal 2 is switched.
When right-hand member node device detects that signal 3 interrupts, send SF3,2 (request opposite end bridge joint signals 3, notice opposite end is still the state of bridge joint signal 2 at present)
The bridge joint of left end node device cancel message 2 is switched, and the bridge joint of executive signal 3, then, send RR3,3 (reverse request, request opposite end bridge joint signal 3, and inform this side, opposite end settling signal 3 bridge joint);
The bridge joint of right-hand member node device settling signal 3, sends SF3,3 (notice opposite end settling signal 3 bridge joints)
Switching of left end node device settling signal 3.
When right-hand member node device detects the fault recovery of service aisle 3, send WTR3,3 (notice opposite end enters the Wait-to-Restore state of switching)
Left end node device still has deterioration because of service aisle 2, therefore after the switching of cancel message 3, sends SD2,3 (request opposite end bridge joint signal 2, because SD priority is higher than WTR);
The switching and after settling signal Bridge 2 connects, send RR2 of right-hand member node device cancel message 3,2 (reverse request, request opposite end also bridge joint signal 2, and inform this side, opposite end settling signal Bridge 2 connect);
The bridge joint of left end node device settling signal 2 and switching, sends SD2,2;
Right-hand member node device the switching of settling signal 2 again.
Visible, after node device (local terminal) detects that signal changes, first notify the corresponding signal of opposite end bridge joint, local terminal bridge joint is reinformed after the bridge joint of opposite end, local terminal carries out bridge joint and switches, and then opposite end completes and switches, and signaling needs to be switched by three mutual bridge joints just executing two ends, in every southbridge reversed process, the decision-making of the APS at two ends respectively need perform twice, and business switching time is longer.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of method and the node device that realize bidirectional linear protection switch of multiplex section, with when not affecting the equipment interconnection with operation standard agreement, improves multiplex section 1:N bidirectional linear pretection switch efficiency.
In order to solve the problem, the invention provides a kind of method realizing bidirectional linear protection switch of multiplex section, comprising:
After node device calculates the highest bridge joint request of protection in-group priority, carry out the bridge joint of the corresponding business of this bridge joint request according to the first decision-making mode and switch.
Further, said method also has feature below: the bridge joint that described node device carries out the corresponding business of this bridge joint request according to the first decision-making mode and the step of switching comprise: if described node device judges that this node device configure is the first decision-making mode, then the bridge joint carrying out the corresponding business of this bridge joint request with switch.
Further, said method also has feature below: the bridge joint that described node device carries out the corresponding business of this bridge joint request according to the first decision-making mode comprises with the step of switching:
If what described node device judged the MSOH K2 instruction received is the first decision-making mode, then carries out the bridge joint of the corresponding business of this bridge joint request and switch.
Further, said method also has feature below:
If after what described node device judged that the MSOH K2 that receives indicates be the step of the first decision-making mode, also comprise: preserve described first decision-making mode;
After the described bridge joint carrying out the corresponding business of this bridge joint request according to the first decision-making mode and the step of switching, also comprise: the MSOH K2 sending described first decision-making mode of instruction.
Further, said method also has feature below: in the described bridge joint carrying out the corresponding business of this bridge joint request according to the first decision-making mode and the process of switching, also comprise:
If described node device receives the switching control information that webmaster issues, and judge that the decision-making mode that described switching control information is carried is different from the decision-making mode of current execution, then report decision-making mode not match information to described webmaster.
In order to solve the problem, present invention also offers a kind of node device, comprise at least one working port and a protection port, described working port and described protection port and APS (APS) module alternately, wherein,
Described APS module, after calculating the highest bridge joint request of protection in-group priority, carries out the bridge joint of the corresponding business of this bridge joint request according to the first decision-making mode and switches.
Further, above-mentioned node device also has feature below:
Described APS module, if be the first decision-making mode specifically for what judge that this node device configures, then carry out the bridge joint of the corresponding business of this bridge joint request and switches.
Further, above-mentioned node device also has feature below:
Described APS module, if be the first decision-making mode specifically for the MSOH K2 byte instruction that judges to receive, then carry out the bridge joint of the corresponding business of this bridge joint request and switches.
Further, above-mentioned node device also has feature below:
Described APS module, also for preserving described first decision-making mode, also for sending the MSOH K2 indicating described first decision-making mode after completing bridge joint and switching.
Further, above-mentioned node device also has feature below:
Described APS module, if also for receiving the switching control information that webmaster issues, and judges that the decision-making mode that described switching control information is carried is different from the decision-making mode of current execution, then reports decision-making mode not match information to described webmaster.
The invention provides a kind of method and the node device that realize bidirectional linear protection switch of multiplex section; three of protocol byte in reversed process times are reduced to once mutual alternately; correspondingly the process such as decision-making also for once; that greatly can improve the protection of multiplex section 1:N bidirectional linear switches efficiency; thus make up the deficiency of other processing unit; specifically, perform multiplex section protection decision-making and obtain optimization, the so corresponding requirement that will reduce other processing units.Such as, after switching efficiency raising, the corresponding requirement that can reduce fast detecting alarm, usual fast detecting alarm is completed by hardware, so relatively can reduce some parameter requests to hardware.Meanwhile, notice phase pattern and also enhance controllability.
Accompanying drawing explanation
Fig. 1 is the APS message flow schematic diagram of multiplex section 1:N bidirectional linear pretection switch 3-phase;
Fig. 2 is the schematic diagram of the node device of one embodiment of the invention;
Fig. 3 is the flow chart realizing the method for bidirectional linear protection switch of multiplex section of the embodiment of the present invention;
Fig. 4 is the APS message flow schematic diagram of the bidirectional linear protection switch of multiplex section 1-phase that the present invention proposes;
Fig. 5 is 1-phase node device of the present invention and the APS message flow schematic diagram docked of 3-phase node device.
Embodiment
At G.8031 (Ethernet pretection switch) with G.8131 in (T-MPLS linear protection switching); reversed process is improved; introduce 1-phase (only needing a mutual protocol byte between two nodes) and switch implementation, what effectively improve the protection of 1:N bidirectional linear switches efficiency.And G.8131 be G.8031 adopt fixed form to perform bidirectional linear pretection switch in.
Specify with reference to above standard; the present invention proposes the execution also introducing 1-phase in the two-way 1:N linear protection of multiplex section, mainly by phase mark in the signaling, shows the decision-making mode of local terminal to opposite end; consult the decision-making mode at two ends, carry out protection decision-making by unified pattern.Also consider the docking to original process simultaneously.Method in this paper is also applicable to OTN (OpticalTransportNetwork, the optical transfer network) linear protection G.873.1 specified.
Main thought of the present invention is: multiplex section 1:N bidirectional linear protection decision-making adopts 1-phase method; after this node calculates the highest bridge joint request of protection in-group priority; then directly complete the bridge joint of the corresponding business of this largest request and switch; and send this request to opposite end; after opposite end receives request; if be confirmed to be largest request, also the corresponding bridge joint that completes is switched, now business recovery.
The b6-b8 of MSOH K2 byte, existing standard is defined as follows:
000 is empty
001-101 reserves
110MS-RDI (instruction of multiplex section remote bug)
111MS-AIS (Multiplex Section AIS)
The reserved byte used wherein is consulted the phase pattern (decision-making mode) indicating two ends by the present invention, and performs corresponding decision-making according to match condition.
The current MSP (MultiplexSectionProtection, multiplex section protection) accessing side in PTN (PacketTransportNetwork, Packet Transport Network) equipment applies the inventive method to improve pretection switch efficiency.The schematic diagram of the node device of one embodiment of the invention, as shown in Figure 2.
The present invention is at the b6-b8 of MSOH K2 byte, and increase is defined as follows:
0011-phase
0113-phase
The multiplex section 1:1 bidirectional protective group set up comprises STM port #A-1 and #B-1 of line card A and B; wherein #A-1 is working port; #B-1 is protection port; 1:N bidirectional protective group comprises N number of working port and 1 protection port; 1:N can only protect a service aisle simultaneously; N number of service aisle shares a protection channel, so generally determine according to priority the business protecting which service aisle.
K1, K2 byte that line card A detects the warning information of #A-1 port, the warning information of line card B detection #B-1 port and receives; the APS decision-making module of master control borad is sent to by communication module between plate; APS decision-making module also receives the switching control command that the protection group of Network Management Equipment to this node device issues, and user can arrange the two-way decision mode etc. of multiplex section 1:N.
User is when configuring the multiplex section protection group of certain end equipment, and the decision mode that can indicate this protection group adopts 1-phase, or 3-phase, and like this, in the K2 byte that this end equipment sends in protection group, b6-b8 will fill out the value of correspondence.
Fig. 3 is the flow chart realizing the method for bidirectional linear protection switch of multiplex section of the embodiment of the present invention, as shown in Figure 3, comprises step below:
S10, node device, according to warning information or the port receiving K byte or the effect of switching control equal excitation, search multiplex section protection group mark (ID) obtaining configuring;
Node device receives warning information, switching control information, then initiate local bridge joint request to APS module, also can be directly these information to be inputed to APS module, and APS module is as local bridge joint request process.
S20, this node device compare local request and/or far-end request in protection group, calculate the business numbering of the highest largest request of protection in-group priority and request;
The request extracting opposite end from the signaling that opposite end sends over is far-end request, and local largest request is the bridge joint request that the bridge joint request medium priority of all working passage and protection channel in local protection group is the highest.Local largest request just should calculate (namely comparatively being produced by the warning information of passage each in local protection group, the priority ratio of switching control information) when the bridge joint request of certain passage local changes; far-end request extracts when then receiving opposite end signaling from multiplex section, and this process specifically can see G.8131.
Determine the request that priority is the highest, guarantee two ends are carried out consistent bridge joint to the passage at this request place and are switched.If the highest request is local request, then this request is by asking the opposite end of corresponding signaling (as SD, SF etc.) announcement; If far-end request, then the signaling sent is RR (reverse request, expression is and confirms request).
S30, the decision-making mode indicated according to the K2 received, carry out bridge joint and switch;
Judge the information of the K2 received, i.e. b6-b8, the decision-making mode information of opposite end is extracted from K2, if when the b6-b8 receiving K2 is 011, preservation decision-making mode mode is 3-phase, perform decision-making (summary), and the b6-b8 sending K2 fills in 011 by the 3-phase of standard, instruction 3-phase, terminates;
If it is 1-phase that webmaster arranges the two-way decision-making mode of multiplex section 1:N, the decision-making mode that webmaster is arranged is different from the decision-making mode of the current operation of this node if judge for node device (APS decision-making module), then report decision-making mode not match information to Network Management Equipment, to point out to the one of client, similar alarm prompt, terminates.
If receive K2 to indicate 1-phase, preservation executive mode mode is 1-phase, turns to step S40.If receive K2 to indicate other values, judge the situation that local terminal is arranged, if equipment is 3-phase, performs decision-making (summary) by the 3-phase of standard, otherwise turn to step S40.
The bridge joint of the business numbering of the request instruction that S40, execution priority are maximum and switching.
If largest request is far-end request, turn S50; Otherwise sending protocol byte content is: request type is largest request, requested service numbering and bridging traffic numbering are all the business numbering of largest request instruction, and in K2, b6-b8 indicates 1-phase, terminates;
S50, transmission protocol byte content are: request type is RR (reverse request), and requested service numbering and bridging traffic numbering have been all that the business of largest request instruction is numbered, and in K2, b6-b8 indicates 1-phase, terminates.
If it is 3-phase that management plane arranges the two-way decision-making mode of multiplex section 1:N, if node judges that the decision mode that webmaster arranges is different from the decision mode that this locality stores, then report decision-making mode not match information to Network Management Equipment, be to point out to the one of client, similar alarm prompt, terminates.
After completing decision-making, bridge joint switched the result of decision by communication module between plate and pass to line card A and line card B and perform, send K1, K2 and pass to line card B and send by protecting port.
The S50 more than processed, whether 1-phase process sends is RR is that it doesn't matter, because two ends have completed bridge joint and have switched, still send RR, mainly consider when docking with the SDH equipment of operation standard agreement, ensure that APS agreement still can normally be run, and other regulation only uses the standard regulation of 1-phase, and last that send is NR.
Introduce this method and effectively can make up the impact of following problems on switching time: 1, between plate, the efficiency of transmission of communication module is low; 2, in master control, APS decision-making module decision-making execution efficiency is low; 3, the execution efficiency that performs an action of line card is low.
The switching time of business and above-mentioned several be all related, when after minimizing interaction times, the requirement tackling other parts mutually can appropriateness reduce.
Fig. 4 is the APS message flow schematic diagram of the bidirectional linear protection switch of multiplex section 1-phase that the present invention proposes; in this flow process; at least one equipment of left and right end node devices is set to 1-phase pattern; in the process that two end node devices are shaken hands; or the b6-b8 in the K2 sent in the process of pretection switch indicates 1-phase, pretection switch process is as follows:
Initial node device two ends all send NR0, the signaling of 0;
When left end node device detects signal 2 deterioration, and the priority calculating the SD bridge joint request of signal 2 is the highest, then complete bridge joint and switch, therefore sends SD2,2 (request opposite end bridge joint signals 2);
If the bridge joint Request Priority of right-hand member node device confirmation signal 2 is the highest, also the bridge joint of settling signal 2 is switched, and sends RR2,2.Following processes process is similar.
From above, by sending SD2,2 bridge joints namely completing two ends are switched, and switch implementation and are simplified, and meanwhile, the degree of transitivity of APS signaling decreases, and the time that correspondence expends decreases, and switch that efficiency is corresponding to be improved.
Fig. 5 is 1-phase node device of the present invention and the APS message flow schematic diagram docked of 3-phase node device; suppose that left end node device is set to 1-phase; right-hand member node device is set to existing node device, and (existing node device is all perform by 3-phase; can not phase be detected from K2 and send phase mode), pretection switch process is as follows:
Initial two ends all send NR0, the signaling of 0;
When left end node device (performs by 1-phase, because receive K2 byte there is no pointing-type, therefore still by 1-phase perform) signal 2 deterioration (SD) detected time, and the priority calculating the SD bridge joint request of signal 2 is the highest, then complete bridge joint to switch, therefore send SD2,2 (request opposite end bridge joint signals 2);
Right-hand member node device is (because be old equipment, the decision-making mode that K2 indicates can not be judged, but by normal 3-phase process, the K1K2 received is SD2,2, represent left end request right-hand member bridge joint signal 2, simultaneously left end settling signal Bridge 2 connect, so local terminal just can the bridge joint of settling signal 2 switched) the bridge joint Request Priority of confirmation signal 2 is the highest, also the bridge joint of settling signal 2 is switched, send RR2,2.
When right-hand member node device detects that signal 3 lost efficacy (SF), and the priority calculating the SF bridge joint request of signal 3 is the highest, then the switching of cancel message 2, and sends SF3,2;
The bridge joint of left end node device cancel message 2 is switched, and the bridge joint of settling signal 3 is switched, and sends RR3,3;
The bridge joint of right-hand member node device settling signal 3 is switched, and sends SF3,3;
Following processes process is similar.
Equipment of the present invention can be compatible with existing equipment well, there is not the problem of docking.And whole process deteriorates at most to shake hands for twice and just completes bridge joint and switch, therefore also do not bring impact to switching efficiency.
3-phase side refers to not adopt node of the present invention to perform by acquiescence 3-phase mode, and 1-phase side refers to adopt node of the present invention to perform by 1-phase mode
As shown in Figure 5, when ask is initiated by 3-phase side time, whole process deteriorate to 2-phase (between two nodes mutual twice protocol byte) perform, and if request initiated by 1-phase side, be still by 1-phase execution.Perform if B presses 3-phase, when finally receiving NR, instead of during RR, can cause B point possibly cannot complete and switch (NR request was originally only used to indicate current without request, request signal be numbered 0 or extra traffic number).
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize.Correspondingly, each module in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
These are only the preferred embodiments of the present invention; certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.
Claims (6)
1. realize a method for bidirectional linear protection switch of multiplex section, comprising:
After node device calculates the highest bridge joint request of protection in-group priority, carry out the bridge joint of the corresponding business of this bridge joint request according to the first decision-making mode and switch;
The bridge joint that described node device carries out the corresponding business of this bridge joint request according to the first decision-making mode comprises with the step of switching:
If what described node device judged the MSOH K2 instruction received is the first decision-making mode, then carries out the bridge joint of the corresponding business of this bridge joint request and switch;
Wherein, the information b6-b8 of MSOH K2 byte, increase is defined as follows:
001----1-phase, 011----3-phase; Wherein,
001----1-phase represents, if when the b6-b8 of the K2 received is 001, preservation executive mode is 1-phase;
011----3-phase represents, if when the b6-b8 of the K2 received is 011, preservation decision-making mode is 3-phase;
1-phase is the first decision-making mode, and 3-phase is the 3rd decision-making mode.
2. the method for claim 1, is characterized in that:
If after what described node device judged that the MSOH K2 that receives indicates be the step of the first decision-making mode, also comprise: preserve described first decision-making mode;
After the described bridge joint carrying out the corresponding business of this bridge joint request according to the first decision-making mode and the step of switching, also comprise: the MSOH K2 sending described first decision-making mode of instruction.
3. the method as described in any one of claim 1-2, is characterized in that: in the described bridge joint carrying out the corresponding business of this bridge joint request according to the first decision-making mode and the process of switching, also comprise:
If described node device receives the switching control information that webmaster issues, and judge that the decision-making mode that described switching control information is carried is different from the decision-making mode of current execution, then report decision-making mode not match information to described webmaster.
4. a node device, comprise at least one working port and a protection port, described working port and described protection port and APS APS module alternately, is characterized in that:
Described APS module, after calculating the highest bridge joint request of protection in-group priority, carries out the bridge joint of the corresponding business of this bridge joint request according to the first decision-making mode and switches;
Described APS module, if be the first decision-making mode specifically for the MSOH K2 byte instruction that judges to receive, then carry out the bridge joint of the corresponding business of this bridge joint request and switches;
Wherein, the information b6-b8 of MSOH K2 byte, increase is defined as follows:
001----1-phase, 011----3-phase; Wherein,
001----1-phase represents, if when the b6-b8 of the K2 received is 001, preservation executive mode is 1-phase;
011----3-phase represents, if when the b6-b8 of the K2 received is 011, preservation decision-making mode is 3-phase;
1-phase is the first decision-making mode, and 3-phase is the 3rd decision-making mode.
5. node device as claimed in claim 4, is characterized in that:
Described APS module, also for preserving described first decision-making mode, also for sending the MSOH K2 indicating described first decision-making mode after completing bridge joint and switching.
6. the node device as described in any one of claim 4-5, is characterized in that:
Described APS module, if also for receiving the switching control information that webmaster issues, and judges that the decision-making mode that described switching control information is carried is different from the decision-making mode of current execution, then reports decision-making mode not match information to described webmaster.
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| CN201010294424.5A CN101951303B (en) | 2010-09-26 | 2010-09-26 | A kind of method and node device realizing bidirectional linear protection switch of multiplex section |
| PCT/CN2010/079521 WO2012037754A1 (en) | 2010-09-26 | 2010-12-07 | Method and node device for realizing bidirectional linear protection switching for multiplex section |
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| CN102882590A (en) * | 2011-07-15 | 2013-01-16 | 中兴通讯股份有限公司 | Processing method, device and system after disappearance of fault on bidirectional working path |
| CN102801611B (en) * | 2012-07-05 | 2018-11-16 | 南京中兴新软件有限责任公司 | A kind of method that realizing cross-line card MSP, main control chip and PTN device |
| CN102868441B (en) * | 2012-08-22 | 2017-03-22 | 中兴通讯股份有限公司 | Protection switching method and system and optical network node |
| KR20150044801A (en) * | 2013-10-17 | 2015-04-27 | 한국전자통신연구원 | Method and apparatus for linear protection switching |
| US9806939B2 (en) | 2013-10-17 | 2017-10-31 | Electronics And Telecommunications Research Institute | Method and apparatus for linear protection switching |
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| CN1617476A (en) * | 2003-11-12 | 2005-05-18 | 阿尔卡特公司 | Trail/path protection for SDH/SONET networks |
| CN101702658A (en) * | 2009-11-24 | 2010-05-05 | 中兴通讯股份有限公司 | Implement method of ring network protection and system thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101951303A (en) | 2011-01-19 |
| WO2012037754A1 (en) | 2012-03-29 |
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