CN101436963A - Method for switching veneer network card, distributed system and veneer - Google Patents
Method for switching veneer network card, distributed system and veneer Download PDFInfo
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- CN101436963A CN101436963A CNA2008102389220A CN200810238922A CN101436963A CN 101436963 A CN101436963 A CN 101436963A CN A2008102389220 A CNA2008102389220 A CN A2008102389220A CN 200810238922 A CN200810238922 A CN 200810238922A CN 101436963 A CN101436963 A CN 101436963A
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Abstract
The invention provides a method for switching network cards of single boards, a distribution type system and the single boards. The method for switching the network cards of the single boards comprises a first network card and a second network card with the same media access control address on the single board, wherein the first network card is bound with an internet protocol address. The method comprises a transmitting step and a receiving step, wherein the transmitting step comprises the following steps: carrying out data transmission on a transmission function by the first network card; and switching to the second network card when a switching condition comes into existence, and carrying out data transmission by the second network card; and the receiving step comprises the following step: returning the received data to an internet protocol layer of the first network card by a data receiving function. In the method, a line card is subjected to network backup unilaterally, when a network card of the line card has a failure, the other network card is automatically switched, thereby improving the stability and robustness of communication among boards, and realizing switching among network cards cleared to top level application without affecting the top level application. The method has the advantages of low cost, easy realization and maintenance.
Description
Technical field
The present invention relates to the network communications technology, relate in particular to a kind of changing method, distributed system and veneer of network interface card of veneer.
Background technology
Along with the fast development of internet, APPLICATION OF A DISTRIBUTED SYSTEM also more and more widely.In general, distributed system is made up of 3 major parts: master control borad, backboard and business board.Carry out communication between plate by backboard with Ethernet between master control borad and business board.With the distribution switch is example, comprises in the system: master control borad, backboard and ply-yarn drill, all be equipped with network interface card and be used for communication between plate on master control borad and the ply-yarn drill.
Because the sharp increase of message volume now, be difficult to avoid because network interface card fault on the ply-yarn drill or the link failure between network interface card and main control board, and cause the communication between plates link occurs fault and interrupt, serious meeting causes the message interaction between master control and the ply-yarn drill to be prevented from, ply-yarn drill breaks away from the control of master control, causes communication service to be affected.
Summary of the invention
The changing method, distributed system and the veneer that the purpose of this invention is to provide a kind of network interface card of veneer are to solve owing to network interface card fault or the link failure between network interface card and main control board on the veneer cause the affected problem of communication service.The changing method of the network interface card of veneer of the present invention comprises: comprise first network interface card and second network interface card with identical Media Access Control Address on the described veneer, the bound internet protocol address of described first network interface card, described method comprises forwarding step and receiving step, wherein:
Forwarding step comprises:
Sending function utilizes described first network interface card to carry out the data transmission;
When switching condition is set up, switch to described second network interface card, utilize described second network interface card to carry out data and send;
Receiving step comprises:
Receive the Internet protocol layer that data function returns the data that receive described first network interface card.
First global pointer and second global pointer point to the control data structure of described first network interface card and second network interface card respectively, and described forwarding step is specially:
Send function and use described first global pointer, utilize described first network interface card to carry out data and send as suction parameter;
When switching condition is set up, the suction parameter of described transmission function is replaced with described second global pointer, utilize described second network interface card to carry out data and send.
In described receiving step, when the interruption that receives data produces, described reception data function is called, parameter when calling is filled to described first global pointer or second global pointer by operating system according to the network interface card of actual reception datagram, after described reception data function gets access to data from the network interface card of described first global pointer or the second global pointer correspondence, without exception data are returned to Internet protocol layer by described first global pointer.
Described operating system is vxworks operating system.
The present invention also provides a kind of distributed system, comprising: main control board, slave control board, veneer;
Described veneer comprises: have first network interface card and second network interface card of identical Media Access Control Address, the bound internet protocol address of described first network interface card;
Has first link between described first network interface card and the described main control board;
Has second link between described second network interface card and the described slave control board;
Described veneer also comprises:
The Link State detection module is used to detect the availability of described first link and second link;
The link switchover module is used for switching between between described first network interface card and second network interface card.
First global pointer and second global pointer point to the control data structure of described first network interface card and second network interface card respectively, described Link State detection module detects described first link when unavailable, the suction parameter that described link switchover module will send function replaces with described second global pointer, utilizes described second network interface card to carry out data and sends;
But described Link State detection module detects the described first link time spent, and still described first global pointer by described transmission function acquiescence sends data.
The present invention also provides a kind of veneer, comprising:
First network interface card and second network interface card with identical Media Access Control Address, the bound internet protocol address of described first network interface card;
Described first network interface card and main control board are set up first link;
Described second network interface card and slave control board are set up second link;
Described veneer also comprises:
The Link State detection module is used to detect the availability of described first link and second link;
The link switchover module is used for switching between between described first network interface card and second network interface card.
First global pointer and second global pointer point to the control data structure of described first network interface card and second network interface card respectively, described Link State detection module detects described first link when unavailable, the suction parameter that described link switchover module will send function replaces with described second global pointer, utilizes described second network interface card to carry out data and sends;
But described Link State detection module detects the described first link time spent, and still described first global pointer by described transmission function acquiescence sends data.
Compared with prior art, the present invention has following beneficial effect:
1, among the present invention ply-yarn drill is unilaterally carried out network port backup, when a network interface card of ply-yarn drill breaks down, automatically switch to another network interface card, thereby improve the stability and the robustness of communication between plate.
2, the MAC Address by two network interface cards on the ply-yarn drill is set to identically, and its IP address also is set to identical, realizes transparent switching between the network interface card of upper layer application.Changing method between network interface card of the present invention is realized in data link layer, can not exert an influence to upper layer application.
3, cost low, be easy to realize and safeguard.
Description of drawings
Fig. 1 is the structural representation of distributed system of the present invention;
Fig. 2 is the switching device shifter schematic diagram in the ply-yarn drill of the present invention;
The method flow diagram of Fig. 3 for realizing that data link layer is switched;
Fig. 4 is for to see schematic diagram of the present invention from application point.
Embodiment
The invention provides a kind of transparent changing method between the network interface card of upper layer application, this network interface card is the network interface card that is used for communication between plates on the ply-yarn drill.Changing method of the present invention realizes that at link layer the active and standby network interface on the ply-yarn drill can be realized switching automatically according to the link quality.The present invention is to be the explanation that example is carried out with the distribution switch, can certainly be router, and on router, ply-yarn drill is called as business board, all is to belong to veneer.
Below in conjunction with accompanying drawing distributed system of the present invention and changing method are described.The present invention describes with the switching under vxworks operating system.Under vxworks operating system, the network interface card of same type uses identical driver, the handle that is provided by driver between the network interface card is distinguished, MUX (multiplex layer, when composite bed) calling the UDI of network interface card, can import the handle of network interface card in the function into, this realizes the possibility that is switching to of network interface card for Drive Layer.
With reference to figure 1, Fig. 1 is a distributed system architecture schematic diagram of the present invention (having shown the connected mode between ply-yarn drill and master control borad among the figure), comprising:
Under the default situations, ply-yarn drill 5 uses main communication network interface card 1, and via Switch8 on the main control board 3 and main control board 3 communications, slave control board 4 is via Switch8 on the main control board 3 and network interface card 1 communication.
When main communication network interface card 1 fault or main communication network interface card 1 and 3 link failures of main control board, switching device shifter in the ply-yarn drill 5 switches to network interface card 2 with the network interface card of current use from network interface card 1, make communication network interface card 2 fully via and the Switch9 of slave control board 4 between passage 7 (shown in the dotted line), and via the link between the Switch8 of the Switch9 of slave control board 4 and main control board 3, with main control board 3 communications.
Switching device shifter in the ply-yarn drill 5 is with reference to shown in Figure 2.Fig. 2 comprises: initialization module, IP (InternetProtocol, Internet protocol) address binding module, calling module, Link State detection module and link switchover module.
After distributed system starts, by initialization module to network interface card 1 and 2 initialization, make these 2 network interface cards that identical MAC (Media Access Control, media interviews control) address be arranged, and point to the control data structure of 2 network interface cards with 2 global pointer p1, p2 respectively.
After initialization was finished, IP address binding module was network interface card 1 binding IP address, and network interface card 1 is started working.
Then, send function and receive data function and wait for the module invokes that is called, the transmission function in the present embodiment is called by MUX.Receiver function is the Interrupt Process function, and when interrupting producing, operating system is just called receiver function.Wait for when being called sending function and receive data function, the Link State detection module detects main availability with communication channel and standby communication channel, if link satisfies predefined switching condition, then the value of flag being composed is 1, if do not satisfy switching condition, then the value of flag being composed is 0.
Be called in case send function and receive data function, then how carry out handover operation according to the function decision of calling by the link switchover module.
When the MUX layer sends data, the transmission function of network interface card is called, if the Link State detection module is judged current flag=1, the suction parameter that the link switchover module just will send function replaces with p2, send data then, if the Link State detection module is judged current flag=0, then link switchover module still uses the suction parameter p1 that sends the function acquiescence to send data.
When the interruption that receives data produced, Interrupt Process function (the reception data function of network interface card) was called.Parameter when calling is filled to p1 or p2 by operating system according to the network interface card of actual reception datagram, receive in the data function, no matter parameter value is p1 or p2, after the network interface card from p1 or p2 correspondence gets access to data, without exception data are returned to the IP layer by p1.
In the process of above-mentioned transceive data, application program is only seen network interface card 1 from start to finish, and its IP address is the IP address of binding in advance.Communicating by letter between ply-yarn drill 5 and the main control board 3 is not affected because of the variation of Link State.
In the system of the present invention, though two network interface cards on the ply-yarn drill 5 have used two passages, because these two network interface cards have identical physical address and IP address, therefore, for higher layer applications, still present the characteristics of Single NIC, can not exert an influence to higher layer applications.
With reference to figure 3, Fig. 3 is the method flow diagram that realization data link layer of the present invention is switched, and may further comprise the steps:
After the system start-up, initialization network interface card 1 and 2 makes 2 network interface cards that identical MAC (Media AccessControl, media interviews control) address be arranged, and points to the control data structure of 2 network interface cards with 2 global pointer p1, p2;
By defining this 2 pointers, make when MUX calls the interface of NIC driver, just can select the data structure of corresponding network interface card as required, to realize the switching between network interface card.
Be network interface card 1 binding IP address, network interface card 1 is started working;
Detect Link State, and according to Link State to flag (mark) assignment;
When supposing to satisfy switching condition, make flag=1, when not satisfying switching condition, make flag=0.
In the process that detects Link State, the transmission function of network interface card and reception data function are waited for and being called, and send and receive routine and in a single day be called, and will enter into following concrete handoff procedure.
For sending routine, if judge current flag=1, the suction parameter that just will send function replaces with p2, sends data then, if judge current flag=0, then still uses the suction parameter p1 that sends the function acquiescence to send data.
For receiving routine, has only the data of receiving with the network interface card 1 of the high-rise binding transmission that could make progress.That is to say, at the driver that two network interface cards are used for backing up, be not handle p2 by the network interface card 2 of the MUX appointment Data transmission (even data are received by network interface card 2) that makes progress, but according to the network interface card 1 of IP layer binding Data transmission upwards.
In the present embodiment, the data of receiving return to the IP layer by p1 without exception, and application program is only seen network interface card 1 from start to finish, and its IP address is the IP address of binding in advance.Ply-yarn drill is not affected because of the variation of Link State with communicating by letter of main control board.
According to the network model of layering, also system of the present invention can be described with the notion of layering.With reference to figure 4, Fig. 4 is for to see schematic diagram of the present invention from application point.Among Fig. 4, all be the relation of calling between layer and the layer.Application program can be used the TCP/IP protocol suite communication by Socket (cover) interface, the call relation of TCP/IP protocol suite and MUX layer is encapsulated by VxWorks, the standard interface that MUX has used the Vxworks network interface card to drive to calling of network port driving program, network interface card drives 802.3 standards is followed in the operation of Ethernet card.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. the changing method of the network interface card of a veneer, it is characterized in that, comprise first network interface card and second network interface card on the described veneer, the bound internet protocol address of described first network interface card with identical Media Access Control Address, described method comprises forwarding step and receiving step, wherein:
Forwarding step comprises:
Sending function utilizes described first network interface card to carry out the data transmission;
When switching condition is set up, switch to described second network interface card, utilize described second network interface card to carry out data and send;
Receiving step comprises:
Receive the Internet protocol layer that data function returns the data that receive described first network interface card.
2. the changing method of the network interface card of veneer as claimed in claim 1 is characterized in that, first global pointer and second global pointer point to the control data structure of described first network interface card and second network interface card respectively, and described forwarding step is specially:
Send function and use described first global pointer, utilize described first network interface card to carry out data and send as suction parameter;
When switching condition is set up, the suction parameter of described transmission function is replaced with described second global pointer, utilize described second network interface card to carry out data and send.
3. the changing method of the network interface card of veneer as claimed in claim 1, it is characterized in that, in described receiving step, when the interruption that receives data produces, described reception data function is called, parameter when calling is filled to described first global pointer or second global pointer by operating system according to the network interface card of actual reception datagram, after described reception data function gets access to data from the network interface card of described first global pointer or the second global pointer correspondence, without exception data are returned to Internet protocol layer by described first global pointer.
4. the changing method of the network interface card of veneer as claimed in claim 3 is characterized in that, described operating system is vxworks operating system.
5. a distributed system comprises: main control board, slave control board, veneer;
It is characterized in that,
Described veneer comprises: have first network interface card and second network interface card of identical Media Access Control Address, the bound internet protocol address of described first network interface card;
Has first link between described first network interface card and the described main control board;
Has second link between described second network interface card and the described slave control board;
Described veneer also comprises:
The Link State detection module is used to detect the availability of described first link and second link;
The link switchover module is used for switching between between described first network interface card and second network interface card.
6. distributed system as claimed in claim 5, it is characterized in that, first global pointer and second global pointer point to the control data structure of described first network interface card and second network interface card respectively, described Link State detection module detects described first link when unavailable, the suction parameter that described link switchover module will send function replaces with described second global pointer, utilizes described second network interface card to carry out data and sends;
But described Link State detection module detects the described first link time spent, and still described first global pointer by described transmission function acquiescence sends data.
7. a veneer is characterized in that, comprising:
First network interface card and second network interface card with identical Media Access Control Address, the bound internet protocol address of described first network interface card;
Described first network interface card and main control board are set up first link;
Described second network interface card and slave control board are set up second link;
Described veneer also comprises:
The Link State detection module is used to detect the availability of described first link and second link;
The link switchover module is used for switching between between described first network interface card and second network interface card.
8. veneer as claimed in claim 7, it is characterized in that, first global pointer and second global pointer point to the control data structure of described first network interface card and second network interface card respectively, described Link State detection module detects described first link when unavailable, the suction parameter that described link switchover module will send function replaces with described second global pointer, utilizes described second network interface card to carry out data and sends;
But described Link State detection module detects the described first link time spent, and still described first global pointer by described transmission function acquiescence sends data.
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| CN 200810238922 CN101436963B (en) | 2008-12-04 | 2008-12-04 | Method for switching veneer network card, distributed system and veneer |
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| CN 200810238922 CN101436963B (en) | 2008-12-04 | 2008-12-04 | Method for switching veneer network card, distributed system and veneer |
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| CN101436963B CN101436963B (en) | 2012-12-19 |
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| WO2011009248A1 (en) * | 2009-07-23 | 2011-01-27 | 中兴通讯股份有限公司 | Data processing method, line card and main control board based on the main control board switch |
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| CN101964719A (en) * | 2009-07-23 | 2011-02-02 | 中兴通讯股份有限公司 | Data processing method based on operating/standby switch of master control boards, line card and master control boards |
| CN101877631A (en) * | 2010-06-28 | 2010-11-03 | 中兴通讯股份有限公司 | Server and business switching method thereof |
| CN102263660A (en) * | 2011-07-19 | 2011-11-30 | 中国舰船研究设计中心 | Dual-network card redundancy switching method and device |
| CN103176885A (en) * | 2011-12-22 | 2013-06-26 | 鸿富锦精密工业（深圳）有限公司 | Network card stoppage prompting system |
| CN102736585A (en) * | 2012-05-14 | 2012-10-17 | 华东桐柏抽水蓄能发电有限责任公司 | Master/slave communication judging/switching system of local control unit based on pulse |
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| CN104468238A (en) * | 2014-12-22 | 2015-03-25 | 上海斐讯数据通信技术有限公司 | Double-network-card redundancy switching method based on vxworks system |
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| CN106445865A (en) * | 2016-10-14 | 2017-02-22 | 上海泓戟信息科技有限公司 | Connecting method for backplane bus of redundancy computer |
| CN113300821A (en) * | 2021-05-21 | 2021-08-24 | 中国兵器装备集团自动化研究所有限公司 | Dual-network-card network hot standby method and system based on sniffing technology |
| CN113300821B (en) * | 2021-05-21 | 2022-11-08 | 中国兵器装备集团自动化研究所有限公司 | Dual-network-card network hot standby method and system based on sniffing technology |
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| CN114338457B (en) * | 2021-12-23 | 2023-12-01 | 绿盟科技集团股份有限公司 | Test system, method, device, equipment and medium for network card switching effectiveness |
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