CN101325521A - Method for detecting and displaying Ethernet MAC frame - Google Patents
Method for detecting and displaying Ethernet MAC frame Download PDFInfo
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- CN101325521A CN101325521A CNA2008101299477A CN200810129947A CN101325521A CN 101325521 A CN101325521 A CN 101325521A CN A2008101299477 A CNA2008101299477 A CN A2008101299477A CN 200810129947 A CN200810129947 A CN 200810129947A CN 101325521 A CN101325521 A CN 101325521A
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Abstract
An Ethernet MAC frame detecting and displaying system includes transmitting nodes and receiving nodes, communicated through Ethernet. The transmitting nodes include a microprocessor, a communication unit, an Ethernet interface unit, a keyboard and a liquid crystal display unit, and are used to complete the configuring and transmitting of the Ethernet MAC frame. The receiving nodes include a microprocessor, an Ethernet interface unit, a detecting unit and a liquid crystal display unit, and are used to detect and display MAC frame. An Ethernet MAC frame detecting and displaying method includes: starting up a detecting system; initializing the transmitting nodes and receiving nodes, and configuring their communication parameter; the transmitting nodes configuring MAC frame; the transmitting nodes starting up the transmission; the receiving nodes detecting and displaying the received MAC frame; and finishing. The inventive detecting and displaying system and method can directly observe each constituent part of the practically transmitted MAC frame, so that users can have more visual and in-depth understanding to transmission mechanism and data format of Ethernet.
Description
Technical field
The present invention relates to ethernet communication, or rather, relate to a kind of ethernet mac frame and detect and display packing.
Background technology
Ethernet (Ethernet) becomes current most important a kind of local area network (LAN) networking technology with its high flexible, simple relatively, the characteristics that are easy to realize, and the enterprises and institutions user of the whole world 90% or more adopts the Ethernet access at present.Initial Ethernet is to use the bus-network of Carrier Sense Multiple Access (CSMA/CD) technology of band collision detection, according to the IEEE802.3 standard, the MAC layer of Ethernet is mainly carried out two tasks: (1), data framing are conciliate frame, comprise addressing and error detection; (2), media interviews management, comprise media distribution (avoiding collision) and competition ruling (collision processing).But along with the Ethernet application and development, semiduplex CSMA/CD mode can not satisfy the demand of current gigabit and even ten thousand mbit ethernet high-speed communications.And along with the raising of bandwidth, at present, Ethernet has progressively been broken through the restriction of local area network (LAN), and trend develops into the ethernet wan based on lan switch or repeater.
But no matter which kind of is used, and its master data transmission all is based on mac frame.Ethernet mac (media interviews control) frame is the BTU of Ethernet at the MAC layer, the core that is ethernet technology embodies, therefore being necessary has clear and accurate understanding to the mac frame of Ethernet, for student or practitioner's study of relevant speciality with understand the ethernet technology all the more so.But in the actual sets network operation, the encapsulation of ethernet mac frame is finished automatically by ethernet controller, and is transparent fully to the user, and this just makes its course of work invisible.Therefore, needs means by experiment detect the ethernet mac frame and show, about this technology, still do not have the document introduction in the prior art at present and do not see that also product emerges.
Summary of the invention
Therefore, purpose of the present invention promptly is in order to solve the Ethernet teaching experiment system of not checking at present mac frame, to be not easy to problem that Ethernet mechanism, essence are studied in depth, provide a kind of ethernet mac frame to detect and display packing, show that with actual content making to have more directly perceived and definite understanding to ethernet communication to the mac frame in the ethernet communication process.
For this reason, the invention provides a kind of ethernet mac frame detects and display system, comprise sending node and receiving node, pass through ethernet communication between described sending node and the receiving node, wherein, described sending node comprises: microprocessor, communication unit, Ethernet interface unit, keyboard and liquid crystal display, and it is used to finish the structure and the transmission of ethernet mac frame; Described receiving node comprises: microprocessor, Ethernet interface unit, detecting unit and liquid crystal display, it is used for detecting and showing mac frame.
The present invention also provides a kind of detection and display packing of ethernet mac frame, and it is used for above-mentioned ethernet mac frame detection and display system, and described method comprises the steps:
S01, the start detection system;
S02, the initialization sending node, and dispose its messaging parameter;
S03, the initialization receiving node, and dispose its messaging parameter;
S04, sending node structure mac frame;
S05, sending node starts transmission;
S06, the mac frame that receiving node detects and demonstration receives;
S07 finishes.
Use ethernet mac frame of the present invention to detect and display packing, its beneficial effect is, by detection of the present invention and display packing, can carry out Direct observation to each part of mac frame structure of actual transmissions, make the user, especially the student can have more directly perceived, deep understanding to the transmission mechanism and the data format of Ethernet.
Description of drawings
Fig. 1 is the structural representation of ethernet mac frame detection of the present invention and display system;
Fig. 2 is the schematic flow sheet of ethernet mac frame detection of the present invention and display packing;
Fig. 3 is the structural representation of sending node in ethernet mac frame detection of the present invention and the display packing;
Fig. 4 is the structural representation of receiving node in ethernet mac frame detection of the present invention and the display packing;
Fig. 5 is the frame format schematic diagram of an embodiment of ethernet mac frame.
Embodiment
According to the detection of a kind of ethernet mac frame of the present invention with show experimental system as shown in Figure 1, this system is made of sending node 1, receiving node 2, pass through ethernet communication between sending node 1 and the receiving node 2, for example, for ease of experimental system networking and demonstration, in the present embodiment, sending node 1 directly is connected by cable with receiving node 2, cable can use twisted-pair feeder, as long as satisfying respective data transfer, the cable of other kind requires also can select for use, for example coaxial cable, optical fiber etc., but be not limited to mentioned kind.Fig. 3 is the structural representation of sending node 1 in ethernet mac frame detection of the present invention and the display packing.As seen from the figure, sending node 1 by microprocessor 102 (for example, the embedded microprocessor S3C44B0X of available Samsung realizes), communication unit 104, Ethernet interface unit 101, keyboard 105 and liquid crystal display 103 form, it is used to finish the structure and the transmission of ethernet mac frame.Wherein, described keyboard 105, liquid crystal display 103 and communication unit 104 are connected respectively to microprocessor 102, keyboard 105 is used to carry out data and order input, 103 of liquid crystal displays show corresponding informations according to the courses of work of node 1, and the data encapsulation framing that microprocessor 102 sends desire by communication unit 104 and the Ethernet interface unit 101 that is connected with communication unit 104 also sends to Ethernet.Its detailed process will describe in detail in conjunction with Fig. 2 later.
Fig. 4 is the structural representation of receiving node in ethernet mac frame detection of the present invention and the display packing.As seen from the figure, receiving node 2 comprises: microprocessor 202 (for example, the embedded microprocessor S3C44B0X of available Samsung realizes), Ethernet interface unit 201, detecting unit 204 and liquid crystal display 203 form, it is responsible for detecting and showing mac frame.Wherein, liquid crystal display 203 and detecting unit 204 are connected respectively to microprocessor 202, detecting unit 204 obtains mac frame from Ethernet by Ethernet interface unit 201, and its content is delivered to microprocessor 202, shows by liquid crystal display 203.Its detailed process will describe in detail in conjunction with Fig. 2 later.
Wherein, typical ethernet mac frame structure as shown in Figure 5, each mac frame comprises the lead code of 8 bytes, the destination address of 6 bytes, the source address of 6 bytes, " type " of 2 bytes are used to represent the protocol type of the data field of mac frame, and the data division of variable-length, be the FCS (Frame Check Sequence, frame error checking sequence) of 4 bytes at last.
Fig. 2 is the schematic flow sheet of ethernet mac frame detection of the present invention and display packing.As shown in Figure 2, the detection and the display packing of the ethernet mac frame of experimental system of the present invention comprise the steps:
S01, the start detection system;
S02, initialization sending node 1, and dispose its messaging parameter;
S03, initialization receiving node 2, and dispose its messaging parameter;
S04, sending node 1 structure mac frame;
S05, sending node 1 starts transmission;
S06, the mac frame that receiving node 2 detects and demonstration receives;
S07 finishes.
Below in conjunction with embodiment ethernet mac frame detection of the present invention is elaborated with display packing.Wherein, step S02 initialization sending node 1 and to dispose the process of its messaging parameter as follows: at first, detection system is carried out its built-in program, finishes the initialization of microprocessor 102, communication unit 104, keyboard 105 and the liquid crystal display 103 of sending node 1 automatically.Wherein, sending node 1 communication unit 104 comprises an ethernet controller, in the present embodiment, realizes that with ethernet controller RTL8019AS its crystal oscillator is made as 2MHz.And the S3C44B0X of sending node 1 microprocessor 102 usefulness Samsungs realizes, its operating frequency is set to 20MHz.
After initialization was finished, the communication parameter configuration of sending node 1 comprised: Ethernet hardware address, IP address to sending node 1 are configured, and this step is finished automatically by system.Wherein, the physical address of sending node 1 is the physical address of ethernet controller RTL8019AS in the communication unit 104, and the IP address is configured according to the IP address of place local area network (LAN), for example: 192.168.1.10.Afterwards, the liquid crystal display 103 of sending node 1 shows corresponding prompt information, and for example show: node 1 initialization finishes; The physical address of node 1 is XX.XX.XX.XX.XX.XX; The IP address is XX.XX.XX.XX; Prepare the structure mac frame; Wherein, the address in the messaging parameter of " XX......XX " expression reality.
Step S03 initialization receiving node 2 and to dispose the process and the step S02 of its messaging parameter similar, its process is: at first, system finishes the initialization of microprocessor 202, detecting unit 204 and the liquid crystal display 203 of receiving node 2 automatically, to guarantee the mac frame of reception sending node 1 transmission that receiving node 2 can be correct.In the present embodiment, and the microprocessor 202 of receiving node 2 is also realized with the S3C44B0X of Samsung, and its operating frequency is set to 64MHz.
After initialization was finished, the communication parameter configuration of receiving node 2 comprised: Ethernet hardware address, IP address to receiving node 2 are configured, and this step is finished automatically by system equally.Wherein, because the hardware of receiving node 2 does not comprise ethernet controller in forming, so a practical significance is not had in the configuration of receiving node 2 physical addresss, but structure that can be correct for sending node 1 is the mac frame of destination node with receiving node 2, still need the physical address of receiving node 2 is configured, the standard that only need satisfy physical address when carrying out the physical address configuration this moment gets final product.The IP address of receiving node 2 also is configured according to the IP address of place local area network (LAN), and obviously receiving node 2 and sending node 1 should be in same local area network (LAN)s, and need satisfy certain condition.For example, obviously, the Ethernet hardware address of receiving node 2 and IP address can not be repeated with sending node 1.And, in the present embodiment, directly connect between receiving node 2 and the sending node 1 by cable, the IP address of receiving node 2 should with sending node 1 at the same network segment, for example the IP address of receiving node 2 can be made as 192.168.1.20.Afterwards, the liquid crystal display 203 of receiving node 2 shows corresponding prompt information, and for example show: receiving node 2 initialization finish; The physical address of receiving node 2 is XX.XX.XX.XX.XX.XX; The IP address is XX.XX.XX.XX; Prepare to receive mac frame; Wherein, the address in the messaging parameter of " XX......XX " expression receiving node 2 reality.
Step S04, sending node 1 structure mac frame, in order to demonstrate needs, this step can be carried out under the user participates in, so that the user has more initiative in the structure of mac frame, for example, the construction process that the user participates in can carry out under liquid crystal display 103 promptings of sending node 1 according to the following procedure: at first, liquid crystal display 103 promptings of sending node 1 " are prepared structure ethernet mac frame ", and provide a choice menus, this menu comprises one " affirmation " button, after the user clicks " determining ", and the beginning of mac frame structure.Under liquid crystal display 103 promptings, the user is provided with destination address field (DAF), source address field, type field and the data field of mac frame by keyboard.Wherein, for guaranteeing correct transmission, destination address should be the Ethernet hardware address of receiving node 2; Source address should be the Ethernet hardware address of sending node 1; Type field is represented the type of protocol massages in the data field, for example may be selected to be 0x0800,0x0806 or 0x8035, and that represents respectively to carry in the data field is IP protocol massages, ARP protocol massages or RARP protocol massages; Because native system is just in order to demonstrate the structure of mac frame, for the sake of simplicity, the user only imports the valid data of a byte when data field is filled; Lead code and FCS (Frame Check Sequence, frame error checking sequence) field user can't intervene, and is added automatically by the ethernet controller RTL8019AS in the communication unit.
Step S05 sending node 1 starts transmission, at first be liquid crystal display 103 display reminding information, for example " the mac frame structure finishes ", and provide a choice menus, this menu comprises one " affirmation " button, after clicking " determining ", start " start and the send " button in sending node 1 communication unit, the ethernet controller RTL8019AS of communication unit detects the mac frame of user's structure among the step S04 automatically, detection comprises the destination address field (DAF) that detects the mac frame of constructing at first automatically, whether source address field and type field satisfy standard, if do not satisfy then point out the user " mac frame structure mistake; please re-construct ", if satisfied then continuation detects the minimum the byte number whether length of data field satisfies regulation, i.e. 46 bytes, then fill 0 make data-field length reach 46 bytes valid data after as not satisfying, if greater than the maximum number of byte of regulation, promptly 1500 bytes are then carried out burst to it and are transmitted.Ethernet controller RTL8019AS adds preamble field and FCS field to this frame automatically then, is sent on the Ethernet by the Ethernet interface unit thereby be configured to complete mac frame, and sends successfully by liquid crystal display 103 demonstrations.Wherein, the minimum of described regulation, maximum number of byte are according to the IEEE802.3 standard, are determined by the general rule of prior art, do not add at this and give unnecessary details.
Step S06 receiving node 2 receives and shows mac frame, carries out under the control of microprocessor 202.For example, as follows according to the reception and the procedure for displaying of present embodiment: S601 begins to catch mac frame; When detecting unit 204 detected bus level and first trailing edge occurs, microprocessor 202 produced an interrupt signal and enters interruption subroutine and begin the testbus level, begins to catch mac frame.S602, level signal to mac frame is sampled, and can correctly sample to bus level for guaranteeing receiving node 2, and bus level counter of every sampling adds 1, and the value and a set point C of counter compared for example this set point C desirable 160 or other multiple of 8.If the value of counter do not reach described set point to proceed to detect; If identical then jump out interruption subroutine and open interruption to remove the timer accumulated error, continue then timer is set timing Ts, Ts=500ns for example, and judge before timer overflows, whether have trailing edge to produce; If have and then read this level signal and be saved in scratchpad area (SPA) one, wait for that then producing an interrupt signal when timer overflows enters interruption subroutine once more; If do not have trailing edge to produce in the time then when timer overflows, produce an interrupt signal to enter interruption subroutine once more at this Ts=500ns.For guarantee can be complete under the situation of the data word joint number that unknown sending node sends the mac frame that transmits on the bus that detects, the present invention has defined a frame end mark, when the frame end mark that detects setting---for example, stop when continuous 3 " 0 " or " 1 " detecting, promptly stop the step that mac frame receives.Wherein, described set point C Consideration is the characteristic of timer null offset; if do not remove cumulative errors for a long time; thereby will cause correctly timing of null offset; and timing Ts considers for transmission combined factors such as ethernet controller operating frequency and the operation frequency of microprocessor and the network bandwidths; in order to avoid colliding and the ruling that conflicts is chosen; those skilled in the art according to above-mentioned parameter when can be voluntarily according to the feasible solution of calculating such as network condition and ethernet controller type and chosen settings C and timing Ts, these conversion will can not exceed protection scope of the present invention.
Wherein, after the microprocessor 202 of receiving node 2 detects the trailing edge of bus level, partly for the user distributes scratchpad area (SPA) one, detected bus level temporarily is kept in the scratchpad area (SPA) one in the storage inside of microprocessor 202.Because Ethernet adopts the network bytes sequence of Manchester's code and big end form to carry out the signal transmission, therefore finish and before display unit shows detected mac frame at level sampling, need carry out step S603, the level signal that receives decoded recover the mac frame data: at first, system once more in the extension storage of microprocessor 202 partly for the user distributes scratchpad area (SPA) two, first signal of sampling from scratchpad area (SPA) one of system begins per 8 and is one group signal is taken out afterwards.Judge in this 8 bit data whether comprise the frame end mark then, promptly continuous 3 0/1, if comprise then microprocessor 202 stops the processing to sampled data; Do not comprise then i position signal in these 8 and i+1 position signal are compared (wherein, i=1,3,5,7).If comparative result is for equating that then the storage mode that increases progressively by full storehouse is pressed into 1 in storehouse; Otherwise then be pressed into 0 in storehouse.Per 8 signals relatively finish, and just 4 signals in the storehouse are taken out and be stored to scratchpad area (SPA) two in order.If not enough 8 of the last data of taking out of system then directly abandon these several data, and finish processing to sampled data.
Afterwards, carry out step S604, the form of the decoded signal in the scratchpad area (SPA) two with the mac frame shown in the accompanying drawing 5 shown by liquid crystal display 203 usefulness graphic methods.
Above embodiment only is preferred embodiment of the present invention, and it is illustrative for the purpose of the present invention, and nonrestrictive.Those skilled in the art carries out conversion, modification even equivalence to it under the situation that does not exceed spirit and scope of the invention, these changes all can fall into claim protection range of the present invention.
Claims (8)
1, a kind of detection of ethernet mac frame and display packing, it is used for above-mentioned ethernet mac frame detection and display system, and described method comprises the steps:
S01, the start detection system;
S02, the initialization sending node, and dispose its messaging parameter;
S03, the initialization receiving node, and dispose its messaging parameter;
S04, sending node structure mac frame;
S05, sending node starts transmission;
S06, the mac frame that receiving node detects and demonstration receives;
S07 finishes.
2, the detection of ethernet mac frame according to claim 1 and display packing is characterized in that, among the described step S02, the communication parameter configuration of sending node comprises the Ethernet hardware address of sending node and IP address are configured.
3, the detection of ethernet mac frame according to claim 1 and display packing is characterized in that, among the described step S03, the communication parameter configuration of receiving node comprises the Ethernet hardware address of receiving node and IP address are configured.
4, the detection of ethernet mac frame according to claim 1 and display packing, it is characterized in that, the step S04 of described sending node structure mac frame comprises that the user is provided with destination address field (DAF), source address field, type field and the data field of mac frame by keyboard.
5, the detection of ethernet mac frame according to claim 1 and display packing is characterized in that, step S06 receiving node detects and shows that the mac frame that receives comprises:
S601 begins to catch mac frame;
S602 samples to the level signal of mac frame;
S603, the level signal that reception is sampled is decoded and is recovered the mac frame data;
S604 shows mac frame.
6, the detection of ethernet mac frame according to claim 5 and display packing, it is characterized in that, described step S601, beginning to catch mac frame comprises: when detecting bus level and first trailing edge occurs, microprocessor produces an interrupt signal and enters interruption subroutine and begin the testbus level.
7, the detection of ethernet mac frame according to claim 6 and display packing is characterized in that, described step S602, and the level signal of sampling mac frame comprises:
Bus level counter of every sampling adds 1, and the value and a set point of counter compared, if the value of counter do not reach described set point to proceed to detect; If reach then jump out interruption subroutine and open interruption to remove the timer accumulated error; Continue then timer is set time Ts when certain, and judge before timer overflows, whether have trailing edge to produce; Then read this level signal and be saved in little inner scratchpad area (SPA) one of handling if having, wait for that then producing an interrupt signal when timer overflows enters interruption subroutine once more; If do not have trailing edge to produce in the time then when timer overflows, produce an interrupt signal to enter interruption subroutine once more at Ts; Wherein, when carrying out aforesaid operations the data of scratchpad area (SPA) one are judged, if stop to sample the mac frame level signal when having the frame end mark of setting.
8, the detection of ethernet mac frame according to claim 7 and display packing is characterized in that, described step S603 decodes to the level signal that samples and to recover the mac frame data and comprise:
System distributes scratchpad area (SPA) two in the extension storage part of microprocessor, begin per 8 from first signal of scratchpad area (SPA) one and be one group and signal taken out and judge described 8 bit data whether comprise the frame end mark, if comprise then microprocessor stops the processing to sampled data; Do not comprise then i position signal and i+1 position signal in described 8 bit data are compared, wherein, i=1,3,5,7; If comparative result is pressed into 1 in storehouse for negative; Otherwise then be pressed into 0 in storehouse; Per 8 signals relatively finish, and just 4 signals in the storehouse are taken out and be stored to scratchpad area (SPA) two in order; If not enough 8 of the last data of taking out of system then directly abandon these several data, and finish processing to sampled data.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101299477A CN101325521B (en) | 2008-07-24 | 2008-07-24 | Method for detecting and displaying Ethernet MAC frame |
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| CN2008101299477A CN101325521B (en) | 2008-07-24 | 2008-07-24 | Method for detecting and displaying Ethernet MAC frame |
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| CN101325521A true CN101325521A (en) | 2008-12-17 |
| CN101325521B CN101325521B (en) | 2011-01-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108762676A (en) * | 2018-05-24 | 2018-11-06 | 安徽雷索信息科技有限公司 | A kind of multichannel big data storage method and its system |
| CN109818811A (en) * | 2019-03-25 | 2019-05-28 | 电子科技大学 | A method of identification distribution class and mixing class MAC protocol |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1913458A (en) * | 2006-08-22 | 2007-02-14 | 哈尔滨工业大学 | Display and detection system and method of MAC frame and LLC frame of CAN |
| CN100581117C (en) * | 2007-11-26 | 2010-01-13 | 哈尔滨工业大学 | Setup of LonWorks communication parameters and detection display system and method for MAC data frames |
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2008
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108762676A (en) * | 2018-05-24 | 2018-11-06 | 安徽雷索信息科技有限公司 | A kind of multichannel big data storage method and its system |
| CN109818811A (en) * | 2019-03-25 | 2019-05-28 | 电子科技大学 | A method of identification distribution class and mixing class MAC protocol |
| CN109818811B (en) * | 2019-03-25 | 2020-05-12 | 电子科技大学 | Method for identifying distribution type and mixed type MAC protocol |
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