CN102231700B - Exchange card switching information transmission method and exchange card hot backup system - Google Patents
Exchange card switching information transmission method and exchange card hot backup system Download PDFInfo
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- CN102231700B CN102231700B CN201110165548.8A CN201110165548A CN102231700B CN 102231700 B CN102231700 B CN 102231700B CN 201110165548 A CN201110165548 A CN 201110165548A CN 102231700 B CN102231700 B CN 102231700B
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Abstract
The invention discloses an exchange card switching information transmission method and an exchange card hot backup system. Logic circuit units are arranged on all exchange cards of the exchange card hot backup system, and output control signals to all line cards. The logic circuit units are also arranged on all the line cards, and monitor the state of each control signal output by the exchange cards in real time. In the occurrence of a switching event, the method comprises that: A, a master control card transmits a switching command to all the exchange cards; B, after receiving the accurate switching command, each exchange card changes the state of the control signal output by own logic circuit unit; and C, after monitoring that the state of each control signal output by the logic circuit units of the exchange cards is changed, the logic circuit unit of each line card performs uplink data channel switching according to a preset control logic by taking the change of the state of the control signal as switching information. By the method and the system, time consumed for the exchange card switching event can be effectively shortened, and the overall switching speed of master/slave exchange cards can be increased.
Description
Technical field
The present invention relates to the centralized switching technology of equipment of data communication field, relate in particular to delivery method and the switching card hot backup system of the switching card handover information on a kind of rack-mount unit.
Background technology
At present, in/the rack communication equipment of large-scale centralized formula exchanges data on, in order to increase equipment reliability of operation, generally all devices exchange card is designed to Hot Spare working method, as backup in 1: 1, n: 1 backup (n represents more than 1) mode etc., formed the hot backup system of switching card, the switching card for these in Hot Spare working method, routine work flow process is as follows:
The equipment initial stage is while powering on operation, by main controller foundation, preset rule, specifying a switching card is current main switching card (being main card), be responsible for the exchanges data work between equipment line card, another switching card (hypothesis equipment has configured 2 switching cards herein, is backup design in 1: 1) is for backup switching card (from card), in stand-by state, main controller also needs to transmit to line card the positional information of master/slave switching card simultaneously, to connect data channel in the configuration of line card selecting properly.Equipment normal operation period, if main switching card breaks down or receives the switching command that network management center sends, main switching card now will be downgraded to from switching card, and original from switching card, will upgrade to main switching card, and the handover event of master/slave switching card occurs.Now a very important thing is that main controller must be notified each line card the handover event of master/slave switching card within the short time of trying one's best, be that main controller need to issue switching card handover information to line card, so that line card connects data channel on switching at once, by new main switching card, carry out exchanges data.
In prior art, in switching card hot backup system, whole handoff procedures of master/slave switching card comprise:
Step S11, handover event produce, as switching card fault or network management center send switching command.
Step S12, handover event report main controller.
Step S13, main controller send switching card handover information to all line cards, and this switching card handover information is a kind of switching command of message format, defer to the transportation protocol between main controller and line card.
Step S14, line card carry out the upper data channel switching that connects after receiving described switching card switching command, then to main controller, return to the information of switching.
Fig. 1 is the schematic diagram that on the rack communication equipment of centralized exchanges data in prior art, switching card hot backup system and switching card handover information issue path.Referring to Fig. 1, described main controller 101, more than one switching card (is two switching cards in this figure, respectively switching card 102 and switching card 103), an above line card (has only drawn line card 104 in this figure, other line card omits) assign on backboard 105, between these boards, by relevant circuit, communicate, thereby formed a kind of hot backup system of switching card.Arrow line in Fig. 1
represent high-speed-differential data/address bus, arrow line
represent management data bus (GET), arrow line
represent that CPU is to configuration management bus between exchange chip, dotted arrow
represent that main controller issues the path of switching card handover information to line card.As shown in Fig. 1 and aforesaid flow process, in the design of current such communication products, whole handoff procedures of aforementioned master/slave switching card are all that the equipment management system consisting of main controller and the CPU management system on each function card that is distributed in is born, all by software, being completed, is a kind of based on the switching card handover information mode that issues CPU management system, pure software and proprietary protocol.Although this technical scheme can guarantee that main controller is correctly delivered to handover information on each line card by formulating good internal communication protocol using, flexibility is higher,, the defect of this technical scheme is also very obvious, its major defect is as follows:
Because main controller needs to transmit switching command to all line cards simultaneously, may cause that each line card receives that switching command is asynchronous, there is mistake in this switching command of receiving for the first time as a certain line card, need to retransmit etc., the switching deadline that can incur loss through delay complete machine, by causing too much data message loss, cannot guarantee efficiency of transmission.Simultaneously when routine data service communication is busy, the daily management communication service of the CPU management channels between main controller and line card is also very busy, and switching card handover information of the prior art need to be handed down to by the CPU management channels between main controller and line card line card, switching card handover information is very urgent again, therefore when heavy traffic, can have a strong impact on downloading speed and the quality of switching card handover information.In a word, the switching card handover event holding time of prior art scheme is longer, and the whole switch speed of master/slave switching card is slower.
There is the handover event of master/slave switching card at equipment during, communication meeting between line card is seriously influenced, even can interrupt completely, cause data message between line card to lose, and in/large-scale computer posture communication equipment, the general important node that all works in communication network, data message loss can have a strong impact on network communication quality.Therefore shorten as far as possible switching card handover event holding time, accelerate the whole switch speed of master/slave switching card as far as possible, can fully reduce the loss quantity of data message, this is also one of very important performance index of the medium/high terminal posture communication equipment of examination.
Summary of the invention
In view of this, a kind of switching card hot backup system that main purpose of the present invention is to provide a kind of delivery method of switching card handover information and carries out the method, to shorten the holding time of switching card handover event, accelerates the whole switch speed of master/slave switching card.
In order to realize foregoing invention object, main technical schemes of the present invention is:
A kind of delivery method of switching card handover information, the method arranges logic circuit unit and by this logic circuit unit, to all line cards, exports control signals, the described control signal state that logic circuit unit is also set on all line cards and is exported by this logic circuit unit Real-Time Monitoring switching card on all switching cards; When switching event, comprise: A, main controller send switching command to all switching cards; B, switching card, after receiving correct switching command, change the control signal state of this switching card logic circuit unit output; After the control signal state that C, described line card logic circuit unit monitor switching card logic circuit unit output changes, using the change of this control signal state as handover information, on switching according to default control logic, connect data channel.
As a kind of preferred version, when switching event, main controller described in steps A sends the mode of described switching command for sending continuously to all switching cards; Switching card described in step B, receiving the switching command that first is correct and changing after the control signal state of this switching card logic circuit unit output, is further sent completely to main controller the return information of carrying out switching command; Described main controller is received after described return information, stops sending switching command to the switching card that sends this return information.
As a kind of preferred version, between described main controller and switching card, by CPU management channels between card, transmit described information.
As a kind of preferred version, while connecting data channel on described line card employing hardware exchange circuit switches, the concrete mode that connects data channel on switching described in step C is: described line card logic circuit unit drives signal according to the control signal state variation of the switching card logic circuit unit output monitoring and described default control logic generation switching, by hardware exchange circuit described in this switching drive, carries out the upper switching that connects data channel.
As a kind of preferred version, while connecting data channel on described line card employing software exchange, the concrete mode that connects data channel on switching described in step C is: described line card logic circuit unit is according to the control signal state variation of the switching card logic circuit unit output monitoring, CPU management to this line card produces corresponding interrupt signal, by this CPU management, according to described interrupt signal and default control logic, produce switching command, the data message processing unit of controlling this line card by this switching command carries out the upper switching that connects data channel.
A switching card hot backup system, comprises main controller, an above switching card and an above line card, and described main controller for sending switching command to all switching cards when switching event; Described in each, on switching card, be provided with logic circuit unit, be used for exporting control signal, its output signal is connected respectively to each line card, this logic circuit unit is controlled by the CPU management of this switching card, is changed the control signal state of this logic circuit unit output after this switching card is received switching command by the CPU management on this switching card; Described in each, on line card, be provided with logic circuit unit, the control signal state of exporting for the logic circuit unit of each switching card of Real-Time Monitoring, at this logic circuit unit, monitor after described control signal state change, line card is usingd the change of this control signal state as handover information, on switching, connects data channel according to default control logic.
As a kind of preferred version, the logic circuit unit output signal of described switching card has strong anti-interference structure.
As a kind of preferred version, in the logic circuit unit of described switching card, there is software locks protection.
As a kind of preferred version, described at least one, in line card, adopt hardware exchange logical circuit; Adopt the logic circuit unit of the line card of this hardware exchange logical circuit to produce switching driving signal according to the control signal state variation of the switching card logic circuit unit output monitoring and described default control logic, by hardware exchange circuit described in this switching drive, carry out the upper switching that connects data channel.
As a kind of preferred version, described at least one, line card adopts software exchange mode; Adopt the logic circuit unit of the line card of software exchange mode to produce corresponding interrupt signal to the CPU management of this line card according to the control signal state variation of the switching card logic circuit unit output monitoring, by this CPU management, according to described interrupt signal and default control logic, produce switching command, the data message processing unit of controlling this line card by this switching command carries out the upper switching that connects data channel.
Compared with prior art, switching card handover information of the present invention is handed down to the path difference of line card: main controller of the present invention is to switching card rather than directly to line card, sends switching command, because the management path between main controller and switching card is very idle, therefore guarantee that switching command can issue efficiently and accurately.Simultaneously, the present invention is provided with logic circuit unit on all switching cards, switching card can change the state of the control signal of this logic circuit unit output after receiving switching command, the described control signal state variation of logic circuit unit Real-Time Monitoring switching card output is also set on all line cards, usings the change of this control signal state as handover information.Because all line cards of the present invention all only carry out switching judging according to the state variation of described control signal, therefore, when there is handover event, all line cards judge consistent with the step height that switches action, have guaranteed synchronism, and efficiency is very high.Therefore, with respect to prior art, the switching card handover information that control card of the present invention sends can be more efficient, synchronous, be sent to line card accurately, so the present invention can shorten the holding time of switching card handover event, accelerate the whole switch speed of master/slave switching card, shortened because switching card switches the communication interruption time causing, reduced data message and lose, promoted network communication quality.
Further, main controller of the present invention can also adopt the mode of continuous transmission to send when switching card sends switching command, until switching card just stops sending after correctly receiving switching command, can further improve the reliability that issues switching card handover information like this.In addition, the priority that described main controller can also arrange switching card switching command sends for highest, preferentially sends this switching command, has further accelerated the whole switch speed of master/slave switching card.
In addition; the present invention has also carried out strong anti-interference design to the logic circuit unit output signal of switching card; thereby guarantee the accuracy of described logic circuit unit output control signal; also in logic circuit unit, be provided with software locks protection; to prevent that potential software error (BUG) from exerting an influence to described output control letter, thereby further guarantee that switching card handover information is handed down to line card exactly.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that on the rack communication equipment of centralized exchanges data in prior art, switching card hot backup system and switching card handover information issue path;
Fig. 2 is the schematic diagram that switching card hot backup system described in first embodiment of the invention and switching card handover information issue path;
Fig. 3 is the schematic diagram that switching card hot backup system described in second embodiment of the invention and switching card handover information issue path;
Fig. 4 is a kind of schematic flow sheet of switching card handover information delivery method of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
Core technology scheme of the present invention is: logic circuit unit is set on all switching cards of switching card hot backup system and by this logic circuit unit, to all line cards, exports control signals, the described control signal state that logic circuit unit is also set on all line cards and is exported by this logic circuit unit Real-Time Monitoring switching card; When switching event, comprise: A, main controller send switching command to all switching cards; B, switching card, after receiving correct switching command, change the control signal state of this switching card logic circuit unit output; After the control signal state that C, described line card logic circuit unit monitor switching card logic circuit unit output changes, using the change of this control signal state as handover information, on switching according to default control logic, connect data channel.
Fig. 2 is the schematic diagram that switching card hot backup system described in first embodiment of the invention and switching card handover information issue path.As shown in Figure 2, described main controller 201, more than one switching card (is two switching cards in the present embodiment, respectively switching card 202 and switching card 203), an above line card (has only drawn line card 204 in this figure, other line card omits) assign on backboard 205, between these boards, by relevant circuit, communicate, thereby formed a kind of hot backup system of switching card.Arrow line in Fig. 2
represent high-speed-differential data/address bus, arrow line
represent management data bus, arrow line
represent that CPU is to configuration management bus between exchange chip, individual event arrow
on described switching card, the connecting line of the control signal of logic circuit unit output, snaps into unidirectional separate connection on each line card by each exchange, is dual star topology, dotted arrow
represent that main controller issues the path of switching card handover information, dotted arrow to line card
represent that line card returns to the path of handover event report to main controller.
As shown in Figure 2, on the present invention's each switching card in switching card hot backup system, a logic circuit unit is set, as the logic circuit unit 221 in this figure and logic circuit unit 231, in a kind of embodiment, can use a slice CPLD (CPLD) chip as described logic circuit unit, this logic circuit unit can be special function device, can be also and the common device of realizing of other function.Described logic circuit unit on each switching card is used for exporting one group of control signal (swap signal), this swap signal is the one direction signal that switching card outputs to line card, the output line of this swap signal need be connected with each line card, thereby form exchange, snaps into the point to point connect between line card.Logic circuit unit on switching card is controlled by the CPU management system of this switching card, and this CPU management system can this logic circuit unit of fast access, and its software program can be controlled according to predetermined protocol the state variation of this group swap signal.
Because the state variation of swap signal is the unique foundation whether all line cards carry out switching judging, therefore in more excellent embodiment of the present invention, the output signal of logic circuit unit is provided with to strong anti-interference structure, thereby strengthened the antijamming capability of swap signal, guaranteed the accuracy of described logic circuit unit output control signal.For example in one embodiment, can use 100 ohm of (Ω) strong pull-up resistance and the little electric capacity sharpening of 1000 pico farads (pF) peak interfered circuit to be added on described logic circuit unit output signal line.In addition, in the more excellent execution mode of another kind of the present invention, software locks protection can be set in logic circuit unit, to prevent that potential software BUG from exerting an influence to described swap signal, thereby further guarantee that switching card handover information is handed down to line card exactly.For example in one embodiment; can to swap sign register in logic circuit unit increase a lock register for the protection of; be that software is write before swap sign register and must be first to writing specified value (as 189) in lock register, to be unblanked; then within 20 clock cycle of regulation, must access swap sign register; this clock cycle number and single clock cycle length are all configurable; as 0.1 microsecond; under all the other conditions, software is all invalid to the access of swap sign register, thereby prevents that potential software BUG from exerting an influence to described swap signal.
Described main controller 201 sends switching command to all switching cards when switching event, receives that the switching card of switching command is changed the swap signal condition of logic circuit unit output by local CPU management.The present invention at main controller to being provided with brand-new switching card switching command transportation protocol between switching card, by CPU management channels between the card between main controller and switching card, transmit described switching command, the present invention still uses message transmissions mode on CPU management channels between this card, owing to snapping into and there is no the data management of service class message between main controller from exchange, therefore, CPU management channels at ordinary times very " free time " between this card, can guarantee that switching command issues efficiently and accurately.
In addition, because main controller is to CPU management channels between the card of switching card very " free time ", so main controller can further use continuous send mode to issue switching card switching command message at this management channels, and efficiency is very high.Switching card, receiving the switching command that first is correct and changing after the control signal state of this switching card logic circuit unit output, is further sent completely to main controller the return information of carrying out switching command; Described main controller is received after described return information, stops sending switching command to the switching card that sends this return information.Newly-installed communication protocol comprises that main controller sends to the switching command message of all switching cards, correctly receiving this command message and carrying out the return information message after this order with switching card, simultaneously owing to requiring high-transmission efficiency, therefore, require these two kinds of infomational message definition succinct as far as possible, message length is short as far as possible.This specification does not provide the concrete form of switching command message and return information message at this, and those skilled in the art can arrange voluntarily according to the disclosed content basis particular device of this specification situation.
As shown in Figure 2, in the present invention, the swap signal of the logic circuit unit of each switching card output sends on each line card.On described each line card, be also provided with logic circuit unit, for example in this figure, on line card n, be provided with logic circuit unit 241, in a kind of embodiment, can use a slice CPLD (CPLD) chip as this logic circuit unit, this logic circuit unit can be special function device, can be also and the common device of realizing of other function.This logic circuit unit 241 on line card is monitored the state of swap signal of the logic circuit unit output of each switching card for real-time tracking, at this logic circuit unit 241, monitor after described swap signal condition change, line card is usingd the change of this swap signal condition as handover information, in strict accordance with default control logic, produce and switch the interrupt signal that drives signal and CPU management, thereby trigger in line card switching, connect data channel.
Described default control logic is as shown in table 1 below, in the present embodiment, mainly for the hot backup system with two switching cards, wherein according to swap signal, is expressed as main switching card when " 0 ", when " 1 " for to judge from switching card principle:
Table 1
Owing to carrying out the upper mode that connects data channel switching in line card, there are two kinds, that is: hardware exchange mode and software exchange mode, therefore the present invention has provided respectively the mode that connects data channel in two kinds of line cards switchings, wherein the first embodiment shown in Fig. 2 is hardware exchange mode schematic diagram, and the second embodiment shown in Fig. 3 is software exchange mode schematic diagram.
As shown in Figure 2, in adopting the line card 204 of hardware exchange mode, use in external hardware exchange circuit 242 switchings and connect data channel, logic circuit unit 241 on line card produces to switch according to the control logic that described swap signal condition changes and above-mentioned table 1 is default monitoring and drives signal, by this switching, drives signal directly to drive described hardware exchange circuit 242 to carry out the upper switching that connects data channel.Meanwhile, logic circuit unit 241 produces interrupt signal to the CPU management system of this line card, and report produces handover event.
Difference embodiment illustrated in fig. 3 and embodiment illustrated in fig. 2 is: in adopting the line card 304 of software exchange mode, as long as logic circuit unit 341 detects the state variation of any swap signal, all the CPU management system to this line card is produced to corresponding interrupt signal, the state variation event of report swap signal occurs, corresponding program module by CPU management system is carried out logic identification according to described interrupt signal and upper table 1, and then generation switching command, the data message processing unit of controlling this line card by this switching command completes the upper switching that connects data channel.
Fig. 4 is a kind of schematic flow sheet of switching card handover information delivery method of the present invention, as shown in Figure 4, between main controller and all switching cards, specifically comprises:
Step S41, main controller be according to various correlation reception information, need to carry out switching card while switching judging, and during the event that switches, starts the highest transmission order of priority, preferentially sends switching command message continuously to all switching cards.
Step S42～S43, all switching cards receive after first correct switching command message certainly, according to this switching command message information, change the described swap signal condition of this switching card logic circuit unit output; Start afterwards and send order, to main controller, be sent completely the return information message of carrying out switching command.
Step S44, main controller receive after the return information message of switching card, stop sending switching command message to the switching card that sends this return information, continue to wait for that the switching of each line card completes information.
The signal that the swap signal condition of described switching card output changes sends to after line card, and the processing procedure of line card specifically comprises:
Step S421, all line cards only carry out switching judging according to swap signal intensity, by logic circuit unit, are detected after any swap signal intensity and according to default control logic, to be triggered line card and connect data channel on switching.No matter and line card employing hardware exchange or software exchange, all the CPU management system to this line card being produced and interrupted, reporting event occurs.
Step S422, no matter be abnormal swap signal combination (as shown in table 1) to be detected or complete to switch after action, CPU management system on each line card all will return corresponding handover event report to main controller, and the result of switching card handover event and line card has only occurred to main controller report for line card in this handover event report.Therefore the present invention is also provided with a handover event report transportation protocol, by CPU management channels between the card of line card and main controller, transmit, due to the transmission channel of this transportation protocol effect and use and traditional switching card switching command to issue mode identical, therefore this transportation protocol can fully be inherited the form of original transportation protocol and return information message, only needs the return information messages that increase a kind of expression swap abnormal signal state (situation that swap1 as shown in table 1 is identical with swap2) more.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (10)
1. the delivery method of a switching card handover information, it is characterized in that, the method arranges logic circuit unit and by this logic circuit unit, to all line cards, exports control signals, the described control signal state that logic circuit unit is also set on all line cards and is exported by this logic circuit unit Real-Time Monitoring switching card on all switching cards; When switching event, comprise:
A, main controller send switching command to all switching cards;
B, switching card, after receiving correct switching command, change the control signal state of this switching card logic circuit unit output;
After the control signal state that C, described line card logic circuit unit monitor switching card logic circuit unit output changes, using the change of this control signal state as handover information, on switching according to default control logic, connect data channel.
2. method according to claim 1, is characterized in that, when switching event, main controller described in steps A sends the mode of described switching command for sending continuously to all switching cards; Switching card described in step B, receiving the switching command that first is correct and changing after the control signal state of this switching card logic circuit unit output, is further sent completely to main controller the return information of carrying out switching command; Described main controller is received after described return information, stops sending switching command to the switching card that sends this return information.
3. method according to claim 1 and 2, is characterized in that, between described main controller and switching card, by CPU management channels between card, transmits described information.
4. method according to claim 1, is characterized in that, while connecting data channel on described line card employing hardware exchange circuit switches, the concrete mode that connects data channel on switching described in step C is:
Described line card logic circuit unit produces switching driving signal according to the control signal state variation of the switching card logic circuit unit output monitoring and described default control logic, by hardware exchange circuit described in this switching drive, carries out the upper switching that connects data channel.
5. method according to claim 1, is characterized in that, while connecting data channel on described line card employing software exchange, the concrete mode that connects data channel on switching described in step C is:
Described line card logic circuit unit is according to the control signal state variation of the switching card logic circuit unit output monitoring, CPU management to this line card produces corresponding interrupt signal, by this CPU management, according to described interrupt signal and default control logic, produce switching command, the data message processing unit of controlling this line card by this switching command carries out the upper switching that connects data channel.
6. a switching card hot backup system, comprises main controller, an above switching card and an above line card, it is characterized in that,
Described main controller for sending switching command to all switching cards when switching event;
Described in each, on switching card, be provided with logic circuit unit, be used for exporting control signal, its output signal is connected respectively to each line card, this logic circuit unit is controlled by the CPU management of this switching card, is changed the control signal state of this logic circuit unit output after this switching card is received switching command by the CPU management on this switching card;
Described in each, on line card, be provided with logic circuit unit, the control signal state of exporting for the logic circuit unit of each switching card of Real-Time Monitoring, at this logic circuit unit, monitor after described control signal state change, line card is usingd the change of this control signal state as handover information, on switching, connects data channel according to default control logic.
7. system according to claim 6, is characterized in that, the logic circuit unit output signal of described switching card has strong anti-interference structure.
8. system according to claim 6, is characterized in that, has software locks protection in the logic circuit unit of described switching card.
9. according to the system described in claim 6-8 any one, it is characterized in that, described at least one, in line card, adopt hardware exchange logical circuit; Adopt the logic circuit unit of the line card of this hardware exchange logical circuit to produce switching driving signal according to the control signal state variation of the switching card logic circuit unit output monitoring and described default control logic, by hardware exchange circuit described in this switching drive, carry out the upper switching that connects data channel.
10. according to the system described in claim 6-8 any one, it is characterized in that, described at least one, line card adopts software exchange mode; Adopt the logic circuit unit of the line card of software exchange mode to produce corresponding interrupt signal to the CPU management of this line card according to the control signal state variation of the switching card logic circuit unit output monitoring, by this CPU management, according to described interrupt signal and default control logic, produce switching command, the data message processing unit of controlling this line card by this switching command carries out the upper switching that connects data channel.
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| CN107547234B (en) * | 2016-06-28 | 2019-12-24 | 中兴通讯股份有限公司 | Method and device for managing main board card and standby board card |
| CN107508771A (en) * | 2017-09-18 | 2017-12-22 | 北京百卓网络技术有限公司 | communication equipment with standby control function |
| CN107734398A (en) * | 2017-09-18 | 2018-02-23 | 北京百卓网络技术有限公司 | The small communication devices of configurable architecture |
| CN107704410A (en) * | 2017-09-18 | 2018-02-16 | 北京百卓网络技术有限公司 | Communication equipment |
| CN110661733B (en) * | 2018-06-29 | 2021-07-30 | 智邦科技股份有限公司 | Network interface card, exchange card and line card |
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| US6363050B1 (en) * | 1998-03-12 | 2002-03-26 | Fujitsu Limited | Switching control in cold standby type of duplex transmission system |
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