CN1599292A - Single-board backup method and device with line protection - Google Patents
Single-board backup method and device with line protection Download PDFInfo
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- CN1599292A CN1599292A CNA03157341XA CN03157341A CN1599292A CN 1599292 A CN1599292 A CN 1599292A CN A03157341X A CNA03157341X A CN A03157341XA CN 03157341 A CN03157341 A CN 03157341A CN 1599292 A CN1599292 A CN 1599292A
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Abstract
The invention discloses a method and device of monoboard backup with the line protection. The equipment includes main and spare monoboard the main board connected with work optical fibre and the spare board connected with protection optical fibre after touching off the switching; the active channel can be switched automatically to the redundant channel; the optical fiber link switch automatically at the same time. The main and spare equipment make the energy controller to connect with the currency backboard through the line; the synchronous clock is provided by the currency backboard. The touching off the switching includes the modes as follows: background sends the switching order; the downstage keystroke of replacement/ switching spring; drawing board spring; the Watchdog overflow; The preparation board veneer detect the abnormity of the key veneer; the abnormity occurs to the key optical fiber link and the switching request of the preparation optical fiber link. The invention is applied to finishing the switch between the mainboard and the spare board as well as realizing the APS switching. During solving the APS switching, we set all the needed information interoperation between the mainboard and the preparing board.
Description
Technical field
The present invention relates to communication technical field, specifically, relate to the route protection of SDH (synchronous digital optical networking) transmission and the backup method of relevant interface device.
Background technology
At communication technical field, the reliability of circuit transmission and communicator is the focus that receives much concern always, in order to improve reliability, general all circuit and device are taked the mode that backs up, promptly ought detect equipment or circuit out of order the time, automatically switch on reserve arrangement/circuit and move.
In the transmission of SDH, the route protection switching standards of an extensive use is arranged: based on the automatic protection switching standard of ITU-TG.841 suggestion.At Chinese patent literature " automatic protection switching method on the high rate SDH loop and device " (number of patent application: 99121279.7), introduced APS (AutoProtection Switch, the automatic protection switching) implementation method of SDH looped network.From this patent as can be seen, the realization that APS switches is more complicated in fact, and complete code amount is in 100,000.Can find out also that from this patent APS switches and to be broadly divided into two classes: 1) main with optical fiber detect local unusual after, send handoff request by standby optical fiber to far-end, wait for the opposite end switch finish after, this locality is carried out optical fiber and is switched.2) standby optical fiber responds the handoff request that far-end sends, and protects switching.In this patent, the APS module occupies the bearing part in system, and there is a large amount of interacting messages in it with other subsystem, thereby has increased switching time.Yet for private network, can be optimized this implementation method fully.In addition, APS switches and carries out on same motherboard, and promptly active channel and protection path all on same veneer, that is to say, have realized that route protection just can't back up veneer simultaneously.And at present a lot of physical layer devices self provide the APS handoff functionality, CX29704 (the frame overhead process chip of a kind of SDH carrying ATM cell) for example, only need carry out simple configuration and just can finish do not share the same light the APS switching between the mouth of this physical layer device, that is to say based on the task of this invention and can finish with chip.
Aspect the protection of device; at present generally the veneer of key is carried out main-apparatus protection, veneer in running order (main with) wherein, another piece veneer is in Hot Spare mode (standby); as long as the work veneer breaks down, just can switch to slave board automatically, rapidly.(number of patent application: 99229246.8) technology has been widely used in the protection of key device to Chinese patent literature " the active and standby plate switching device shifter of a kind of electrical communication system ", and has obtained good effect.In this patent, defined active and standby interlocking logical circuit shown in Figure 2, wherein MASCT is for starting the sign of interlocking, and MASCT is the main usefulness of " 0 " expression competition, for " 1 " represents that locking is standby, by software control.This patent gives the active and standby cue of seven couple as shown in table 1.
The active and standby control cue of table 1
| Active and standby signal | I_MS-VIE、O_MS-VIE | Switching signal |
| I_MS-RST、O_MS-RST | Active and standby reset signal | |
| I_MS-REQ、O_MS-REQ | Switching request signal | |
| I_MS-PWRON、O_MS-PWRON | Veneer index signal on the throne | |
| I_MS-ALM、O_MS-ALM | Abnormal indication signal | |
| I_MS-RUN、O_MS-RUN | Normal operation index signal | |
| I_MS-WDO、O_MS-WDO | Watchdog overflows index signal |
Below the signal of this table is done some explanation:
Switching signal:
Realize the interlocking between active and standby.Comprise input signal O_MS-VIE and output signal I_MS-VIE.The logical circuit of realization interlocking as shown in Figure 2.
Active and standby reset signal:
Be used to be in resetting mutually between the veneer of main and standby relation.Comprise input signal I_MS-RST and output signal O_MS-RST.The rule that active and standby reset signal need be followed is to have only the mainboard slave board that can reset, and therefore must take measures necessary on hardware, makes to be in the I_MS-RST signal of main veneer shielding with state from the other side's plate.
Switching request signal:
Active and standby switching request signal is used to be in the switching between the veneer of main and standby relation.Comprise input signal I_MS-REQ and output signal O_MS-REQ.The rule that active and standby switching request signal need be followed is to have only mainboard to send handoff request to slave board, therefore on hardware, must take measures necessary, make to be in main veneer and not shield from the I_MS-REQ signal of plate or mainboard software are not responded plate is interrupted with state.
Watchdog overflows index signal:
Comprise input signal I_MS-WDO and output signal O_MS-WDO.Be used for showing veneer because the board resetting that a variety of causes causes.
Veneer index signal on the throne:
I_MS-PWRON and output signal O_MS-PWRON.Level signal, high level is effective.Can be used for the shielding of input signal.
Normal operation index signal:
Comprise input signal I_MS-RUN and output signal O_MS-RUN.Level signal, high level is effective.By software set.
Abnormal indication signal:
Comprise input signal I_MS-ALM and output signal O_MS-ALM.Level signal, high level is effective.
Wherein, veneer abnormal indication signal, veneer normally move index signal and switching request signal all can be by software control.
(patent No.: 99229246.8), these signals all have been endowed special implication and function, just mutual as customizing messages in the active and standby switching in this patent.But it is so multi-functional to be not that every kind of veneer all needs, and that is to say to some application it is to exist redundantly, and such as interface single plate, itself not having business datum needs backup, so operatingly just can omit alternately.In addition, normal operation and abnormal indication signal should merge.The present invention redefines these signals, has given new implication, carries out the function expansion, thereby can realize the mutual of more information, switches thereby can be applied to APS.
Summary of the invention
Main purpose of the present invention is to provide a kind of single board backup method with route protection, realizes that the straddle APS of circuit switches when being used to finish active and standby switching.Thus, when the present invention mainly solves straddle APS switching, required various information interactions of carrying out between the main and standby boards are set.
Another purpose of the present invention is to provide a kind of single board backup device with route protection, realizes that the straddle APS of circuit switches when being used to finish active and standby switching.
Summary of the invention mainly comprises:
Reset the mutual announcement line between active and standby, carry out the function expansion;
Active and standby control logic circuit is expanded, realized carrying out between the main and standby boards APS and switch required information interaction;
The APS that realization must be carried out because of main and standby boards switches switches;
Realize handoff procedure based on bottom software and hardware logic electric circuit.
Specifically; the invention discloses a kind of single board backup device with route protection; comprise mainboard, slave board; described mainboard, slave board work in primary and backup mode respectively; mainboard links to each other with working optical fibre; slave board links to each other with protection optical fiber, and the logical circuit of described veneer is provided with the switching state register, in order to finish the information interaction between the mainboard and slave board in automatic protection switching and the active and standby handoff procedure.
Described switching state register utilizes WATCHDOG to overflow index signal line, abnormal indication signal line and normally moves the index signal line and form, and is used for inquiry switch reasons when veneer is received handoff request.
Described switching state buffer status is defined as follows shown in the table:
| ????Bit?2 ????(I_MS-WDO) | ????Bit?1 ????(I_MS-RUN) | ????Bit?0 ????(I_MS-ALM) | |
| Normal operation | ????0 | ????0 | ????0 |
| Plate is normally switched | ????0 | ????0 | ????1 |
| To sheet reset | ????0 | ????1 | ????0 |
| WATCHDOG overflows to plate | ????0 | ????1 | ????1 |
| The local line detection failure | ????1 | ????0 | ????0 |
| The distal line detection failure | ????1 | ????0 | ????1 |
| Keep | ????1 | ????1 | ????0 |
| Keep | ????1 | ????1 | ????1 |
Described active and standby plate enables controller by circuit and links to each other with universal back plate, and synchronised clock is provided by universal back plate, thus the clock synchronization before and after realizing switching.
The invention also discloses a kind of backup method of the single board backup device with route protection, the active and standby switching of veneer is finished by logical circuit and bottom software, and optical fiber link carries out automatic protection switching simultaneously.
What described handover trigger comprised that mainboard initiates initiates with slave board, and wherein the handover trigger initiated of mainboard comprises: the backstage sends the resetting of switching command, foreground/switching key and triggers, pulls out that plate triggers, WATCHDOG overflows and lead with optical fiber link unusual; The handover trigger that slave board is initiated comprises: slave board detects unusual, the standby optical fiber handoff request of mainboard.
Described method comprises at least: send switching request signal, and inform alarm status; Send switching signal, the notice finishing switching; Wherein, described switching request signal and switching signal are all introduced interruption, in case after entering interrupt service routine, the information interaction in the handoff procedure between the active and standby plate adopts the query pattern of bottom software.
Described method comprises active and standby plate power on logical circuit handling process and switching flow; described active and standby plate power on logical circuit handle comprise that CPU operate as normal and initialization finish after; whether Query Board is on the throne; the veneer that will be connected working optical fibre by the software decision is changed to mainboard; the veneer that connects protection optical fiber is in the main state of using of normal competition; if mainboard is abandoned main usefulness, then the automatic competition of slave board is main usefulness, carries out the active and standby switching of the automatic protection switching and the veneer of circuit.
The active and standby switching of described veneer is initiated with veneer by main, and the automatic protection switching of circuit carries out on slave board, after circuit completes successfully automatic protection switching, just carries out active and standby switching.
Described handover trigger is caused by single board default, then earlier finishes active and standby switching by logical circuit, carries out compulsory automatic protection switching then.
The present invention realizes that when finishing active and standby switching the straddle APS of circuit switches, and when having solved straddle APS switching, is provided with required various information interactions of carrying out between the main and standby boards.And the present invention utilizes the logical circuit of active and standby switching and the automatic protection switching that hardware resource has been realized circuit, has realized the protection of circuit and the protection of veneer simultaneously.
Description of drawings
Fig. 1 is apparatus of the present invention overall framework figure;
Fig. 2 is the active and standby logical circuit interlocking of the present invention figure;
Fig. 3 detects the switching flow figure of working optical fibre fault for mainboard;
The switching flow figure that Fig. 4 carries out after the handoff request of far-end for slave board detects;
Embodiment
The device that relates among the present invention as shown in Figure 1.Two veneers work in active/standby mode respectively, and the main veneer (or claiming: mainboard, main board) of using links to each other with working optical fibre; standby board (or claims: slave board; standby plate) link to each other with protection optical fiber, work, to protect optical fiber respectively be a SDH circuit, and the switching of many SDH is not at the row of consideration.Main enable controller by circuit and link to each other with universal back plate with, standby board, synchronised clock is provided by backboard, thereby realizes the synchronism of switching front and back clock.As long as the master is broken down with veneer or working optical fibre, active channel automatically switches to stand-by channel.Not only will finish the active and standby switching of veneer this moment, also will carry out the automatic protection switching of optical fiber.
In device involved in the present invention, because primary and backup optical fiber adheres to two Physical board separately, like this,, so also need optical fiber link to protect switching if active and standby veneer needs to switch, this is the newtype that the present invention faces.After optical fiber link switches simultaneously, also will carry out the switching of active and standby veneer.Thus, the switching is here triggered by following several modes usually:
1) backstage sends switching command;
2) foreground resets/the switching key triggering;
3) pulling out plate triggers;
4) WATCHDOG overflows;
5) to detect mainboard unusual for slave board;
Slave board judges that unusual standard takes place mainboard is the correspondence with foreign country link occurs fault of mainboard, and this fault can send the heartbeat detection bag by slave board and monitor.If mainboard inside other fault takes place and intercepted and captured by system, can in troubleshooting, initiatively initiate active and standby handoff procedure so.
6) main unusual with optical fiber link;
Lose or signal attenuation with the work fiber-optic signal if mainboard detects the master, need switch to slave board work this moment.
7) standby optical fiber handoff request;
If slave board detects the handoff request of sending on the standby optical fiber, also must start and switch.
Fig. 3 and Fig. 4 have shown 6), 7) flow process of two kinds of switchings.From these two figure as can be seen, need to carry out repeatedly information interaction between mainboard and the slave board: at first need to send switching request signal, and inform alarm status: this locality/far-end, still veneer faults itself.Next sends switching signal, the notice finishing switching.These are accused line mutually by limited 7 couple alternately and finish, need not the adding hardware resource.The present invention mainly solve rationally utilize these several signals finish that APS switches and active and standby handoff procedure in information interaction between mainboard and the slave board.In order to satisfy switching demand proposed above, these 7 pairs of holding wires need be done some expansion originally.The present invention is overflowed indication with WATCHDOG and is introduced logical circuit, can supply information inquiry, utilize WATCHDOG to overflow index signal, abnormal indication signal and normally move index signal, in erasable programmable logic circuit apparatus (EPLD, Erasable Programmable Logic Device), designed a switching state register as shown in table 2.This register is used to describe veneer when receiving handoff request, the inquiry switch reasons.Why wanting refinement like this, is because some fault irrecoverable (as reset, WATCHDOG overflows), switches need not give the feedback notice after finishing, and some then needs repeatedly mutual.
Like this, (WATCHDOG overflows the index signal line by these three holding wires, abnormal indication signal line and normal operation index signal line) current alarm status can be described, make the operation troubles of plate (active and standby plate is each other to plate) being known device, need not come alternately by the operation maintenance center of system, thereby carry out corresponding handoff procedure rapidly.The information interaction in the APS handoff procedure and the realization of notice realize by switching request signal and switching signal.These two signals are all introduced interruption, finish handoff procedure by interrupt service routine, in case after entering interrupt service routine, the information interaction between active and standby in the handoff procedure adopts inquiry mode to carry out.Because switching, need in 50ms, finish APS, so inquiry needs overtime setting.Generally speaking, the time-delay of Optical Fiber Transmission is 5 μ s/km, and transmission range is in 200KM, and then the time-delay of Wang Faning is 1ms, is two main time-delay indexs below: the circuit transmission delay is in 1ms, active and standby between the time-delay of communication in 200 μ s.The query pattern that why can adopt bottom software is that the operation that other any tasks are being done when switching is also being carried out all is nonsensical because the priority of active and standby switching is the highest.
Table 2 veneer switching state register
| ????Bit?2 ????(I_MS-WDO) | ????Bit?1 ????(I_MS-RUN) | ????Bit?0 ????(I_MS-ALM) | |
| Normal operation | ????0 | ????0 | ????0 |
| Plate is normally switched | ????0 | ????0 | ????1 |
| To sheet reset | ????0 | ????1 | ????0 |
| WATCHDOG overflows to plate | ????0 | ????1 | ????1 |
| The local line detection failure | ????1 | ????0 | ????0 |
| The distal line detection failure | ????1 | ????0 | ????1 |
| Keep | ????1 | ????1 | ????0 |
| Keep | ????1 | ????1 | ????1 |
The present invention also optimizes the operating process of APS, the line fault unification that is caused by signal attenuation SD (SignalDegrade), signal fault SF (Signal Failure) is SF, and the APS switch reasons that active and standby switching causes is set to force to switch (priority is the highest).
Hardware logic electric circuit has been kept original active and standby switching logic circuit through revising, and when guaranteeing fast and stable, has realized the function expansion, has finished the APS switching.
Implementation method of the present invention is divided two parts narration: the logical circuit that powers on is handled and switching flow.Wherein switching flow is described respectively according to difference triggering reason.
1, the logical circuit that powers on is handled:
All be in the acquiescence stand-by state after main and standby boards powers on, after CPU operate as normal and initialization finish, inquire about whether on the thronely, promptly inquire about I_MS_PWRON plate.If I_MS_PWRON is 0, not on the throne to plate, MASCT is set to 0,100 μ s delay time; This plate will become mainboard.If I_MS_PWRON is 1, promptly on the throne to plate, read plate position signal again; The veneer that will be connected working optical fibre by the software decision is changed to mainboard, is about to this plate MASCT and is set to 0, and 100 μ s delay time; If what veneer connected is the protection passage, earlier MASCT is set to 1, the 100 μ s that delay time are set to 0 with MASCT again, are in the main state of using of normal competition, and promptly standby mode needs only mainboard one and abandons main usefulness, and then the automatic competition of this plate is main using.
2, switching flow:
Switching comprises the switching of circuit and the active and standby switching of veneer, because the two contact closely, so lump together narration.The condition difference of handover trigger, concrete switching flow is also slightly had any different.But all follow following basic principle:
1) if the switching of active and standby veneer causes with veneer that by main then the automatic protection switching of circuit carries out on slave board;
2) mainboard abandon main with and the opening of line interface/inaccessible control carry out by hardware logic electric circuit, and two operate and carry out simultaneously.When two plates all normally moved, circuit automaticallyed switch and to finish the back mainboard and just can abandon main usefulness, blocked track interface, just have only circuit to complete successfully switching after, just can carry out active and standby switching;
3) if switch, then at first finish active and standby switching, carry out compulsory APS then and switch by logic circuit apparatus because single board default causes.Can reduce like this business data transmission to be exerted an influence owing to the circuit switch failure as far as possible.
If by the initiation ground classification of switching, also can be divided into the switching of mainboard initiation and the switching that slave board is initiated.Wherein the switching initiated of mainboard comprises: the backstage sends switching command, and the resetting of foreground/switching key triggers, and WATCHDOG overflows, and pulls out that plate triggers and working line alarm etc.Their handling process is similar substantially.The switching that slave board is initiated comprises: slave board detects main board failure, and the APS handoff request sent of standby optical fiber.
(1) switching of mainboard initiation
In the accompanying drawing 3, initiate to switch to example, detailed handoff procedure has been described with the working line alarm.Below its step is done some explanation:
1) mainboard detects SD, SF
301: mainboard detects main SD, SF fault with the downlink optical fiber link;
302: mainboard reports interruption, starts the APS break in service simultaneously and handles, and in this Interrupt Process flow process, finishes the switching of main and standby boards, finishes in all disconnected hereinto service routine of the processing of mainboard;
303: mainboard at first sends fault message to slave board, waits for the switching message that slave board sends then, waits for that time-delay is 200us;
2) slave board detects the fault message that mainboard is sent
304: after slave board detects main board failure information, enter the respective interrupt service routine.In this interrupt service routine, mainly finish the APS switching flow of optical fiber link;
3) finish the APS switching flow at slave board
Concrete switching flow can be with reference to agreement ITU-TG.841.(K1 and K2 transmit in the MSOH byte of the STM-N (Synchronous Transport Modulelevel N, speed grade is the synchronous transfer mode of N) of carrying protection channel at first to send handoff request K1, K2 by up standby optical fiber.K1, the change of K2 byte means may exist the APS switching request), at several switching situations, the reason of switching has SF and forces to switch (determining according to the alarm status register).Slave board is monitored expense K1, the K2 of its downlink optical fiber, till receiving the switch acknowledgment message that upstream extremity is sent;
If switch to confirm then to mainboard feedback switching request signal.Otherwise, complain to handoff failure.
In the present embodiment, step 3) comprises following flow process:
305: slave board sends handoff request by standby optical fiber to far-end;
306: slave board detects the switching confirmation signal that far-end returns;
307: slave board sends the switching request signal to mainboard;
4) mainboard is abandoned main using
308: after mainboard was received handoff request, putting MASCT was 1, is changed to 0 again, abandons main usefulness, and was in the main state of using of competition, blocked track interface simultaneously;
5) slave board switches to main using
309: slave board is received active and standby switching signal;
310: slave board is opened line interface;
311: slave board sends no switching request signal by standby uplink optical fibers;
312: finish the work optical fiber and protection optical fiber switch, and former standby optical fiber switches to working optical fibre;
313: slave board sends to switch to mainboard finishes signal;
314,315: active and standby plate reports current masterslave state respectively.
Risen by background commands if switch, the warning information unification is changed to " to the plate alarm " so, carries out " forcing to switch " at slave board.The request word that the APS that slave board sends toward far-end switches is different from the circuit alarm, and other handling process is the same with the circuit alarm.
If switch that WATCHDOG by mainboard overflows, reset key, pull out plate etc. and cause unusually, this moment, mainboard was carried out active and standby switching logic circuit immediately, by logical circuit set MASCT, make this plate abandon main using, while blocked track interface, and send a handover request to plate, send alarm status information simultaneously.Plate (slave board) logical circuit is detected the main and standby competition signal, be changed to main usefulness, open line interface simultaneously, and carry out APS and " force to switch ".The same step 3) of flow process.
(2) switching flow of slave board initiation
The switching flow that slave board is initiated mainly contains following two types: respond handoff request and the slave board that standby optical fiber sends and detect the switching of carrying out behind the main board failure.
Figure 4 shows that slave board detects the switching flow of carrying out after the handoff request that distal fiber sends.Be described in detail as follows:
1) standby optical fiber is received the handoff request that far-end is sent
401: slave board is received the K1 of change, during the K2 byte, will trigger interruption, and in interrupt handling routine, to K1, K2 analyzes, if confirm as the handoff request information that is not that far-end is sent, then disregard, otherwise, carry out handover operation;
402: slave board sends switching request signal toward mainboard, waits for the switching command of mainboard then;
2) mainboard is carried out in logical circuit and is switched flow process
403: after the mainboard logical circuit detects switching request signal, make this plate abandon main usefulness, send active and standby switching signal;
404: mainboard blocked track interface;
3) slave board is received switching command
405: slave board is main usefulness at the mid-slave board of logical circuit, opens line interface simultaneously;
4) slave board is replied to far-end and is switched confirmation
406: slave board detect this plate switch to main with after, reply to standby upstream optical fiber end and to switch confirmation.And the nothing that the wait far-end is sent is switched message;
407: slave board is received the nothing switching message of standby optical fiber;
5) finish handoff procedure
408: slave board sends handoff completion message to mainboard, finishes all handoff procedures;
409,410: active and standby plate reports current masterslave state respectively.
If slave board sends reset command to mainboard after detecting the fault of mainboard, mainboard is carried out reset operation immediately, and subsequent operation this moment is with the motherboard hardware performed handover operation that resets.
What also will consider in addition, is the issue of priority of switching.Switch for APS, the request that is higher than far-end according to this locality request is carried out.
Above-mentioned all realizations are all handled based on hardware logic electric circuit and bottom software, and execution speed is higher than the switching flow based on mission mode.Mainly comprise with the interface of upper layer application: the port switching destination address needs upper-layer configured, the switching state of the present veneer in notice upper strata.
Claims (10)
1. single board backup device with route protection; comprise mainboard, slave board; described mainboard, slave board work in primary and backup mode respectively; mainboard links to each other with working optical fibre; slave board links to each other with protection optical fiber; it is characterized in that: the logical circuit of described veneer is provided with the switching state register, in order to finish the information interaction between the mainboard and slave board in automatic protection switching and the active and standby handoff procedure.
2. the single board backup device of band route protection as claimed in claim 1; it is characterized in that: described switching state register utilizes WATCHDOG to overflow index signal line, abnormal indication signal line and normally moves the index signal line and form, and is used for inquiry switch reasons when veneer is received handoff request.
3. the single board backup device of band route protection as claimed in claim 2 is characterized in that: the state of described switching state register is defined as follows shown in the table:
?????Bit?2 ???(I_MS-WDO) ??????Bit?1 ????(I_MS-RUN) ??????Bit?0 ????(I_MS-ALM)
Normal operation ????0 ????0 ????0
Plate is normally switched ????0 ????0 ????1
To sheet reset ????0 ????1 ????0
WATCHDOG overflows to plate ????0 ????1 ????1
The local line detection failure ????1 ????0 ????0
The distal line detection failure ????1 ????0 ????1
Keep ????1 ????1 ????0
Keep ????1 ????1 ????1
4. as the single board backup device of claim 1 or 2 or 3 described band route protections, it is characterized in that: described active and standby plate enables controller by circuit and links to each other with universal back plate, and synchronised clock is provided by universal back plate, thus the clock synchronization before and after realizing switching.
5. the backup method of the single board backup device of a band route protection as claimed in claim 1, it is characterized in that: the active and standby switching of veneer is finished by logical circuit and bottom software, and optical fiber link carries out automatic protection switching simultaneously.
6. the single board backup method of band route protection as claimed in claim 5, it is characterized in that: what described handover trigger comprised that mainboard initiates initiates with slave board, and wherein the handover trigger initiated of mainboard comprises: the backstage sends the resetting of switching command, foreground/switching key and triggers, pulls out that plate triggers, WATCHDOG overflows and lead with optical fiber link unusual; The handover trigger that slave board is initiated comprises: slave board detects unusual, the standby optical fiber handoff request of mainboard.
7. the single board backup method of band route protection as claimed in claim 6 is characterized in that: this method comprises at least: send switching request signal, and inform alarm status; Send switching signal, the notice finishing switching; Wherein, described switching request signal and switching signal are all introduced interruption, in case after entering interrupt service routine, the information interaction in the handoff procedure between the active and standby plate adopts the query pattern of bottom software.
8. the single board backup method of band route protection as claimed in claim 5; it is characterized in that: this method comprises active and standby plate power on logical circuit handling process and switching flow; described active and standby plate power on logical circuit handle comprise that CPU operate as normal and initialization finish after; whether Query Board is on the throne; the veneer that will be connected working optical fibre by the software decision is changed to mainboard; the veneer that connects protection optical fiber is in the main state of using of normal competition; if mainboard is abandoned main using; then the automatic competition of slave board is main usefulness, carries out the active and standby switching of the automatic protection switching and the veneer of circuit.
9. the single board backup method of band route protection as claimed in claim 8; it is characterized in that: the active and standby switching of described veneer is initiated with veneer by main; the automatic protection switching of circuit carries out on slave board, after circuit completes successfully automatic protection switching, just carries out active and standby switching.
10. the single board backup method of band route protection as claimed in claim 8 is characterized in that: described handover trigger is caused by single board default, then earlier finishes active and standby switching by logical circuit, carries out compulsory automatic protection switching then.
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|---|---|---|---|
| CN03157341XA CN1599292B (en) | 2003-09-19 | 2003-09-19 | Single-board backup method and device with line protection |
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| CN03157341XA CN1599292B (en) | 2003-09-19 | 2003-09-19 | Single-board backup method and device with line protection |
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| CN1599292B CN1599292B (en) | 2010-04-28 |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| WO2016177091A1 (en) * | 2015-07-01 | 2016-11-10 | 中兴通讯股份有限公司 | Main/standby single board switching method and apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000330815A (en) * | 1999-05-24 | 2000-11-30 | Matsushita Electric Ind Co Ltd | Duplexed switching control device and method |
| CN1300966C (en) * | 2003-04-09 | 2007-02-14 | 华为技术有限公司 | Channel protection method ketween plates in wavelength division multiplexing system |
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2003
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