CN101867493A - Ethernet network packet fast-forwarding realization method based on microwave facility network management system - Google Patents
Ethernet network packet fast-forwarding realization method based on microwave facility network management system Download PDFInfo
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Abstract
The invention relates to an ethernet network packet fast-forwarding realization method based on a microwave facility network management system; the method is realized based on the microwave facility network management system; the system comprises a management station and a plurality of microwave stations, the microwave station is composed of a microwave facility or a plurality of microwave facilities, the management station is connected with one microwave facility in one microwave station by a network line, a plurality of microwave facilities in one microwave station are connected by the network line, the adjacent microwave stations are connected mutually by a microwave link, self-definition is carried out to data format on the basis of simple network management protocol SNMP. In the invention, fast forwarding from the ethernet network packet structure to 64kbit/s serial line is realized, fast, stable and reliable forwarding requirements of a data packet are met, and the invention is a fast-forwarding realization method of the ethernet network packet in the serial link.
Description
Technical field
The present invention relates to based on the quick implementation method of transmitting of the Ethernet bag of microwave equipment network management system, just a kind of implementation method of transmitting the Ethernet bag on the 64kbit/s arrowband by the microwave equipment network management system belongs to adopt and transmits the technical field that the Ethernet bag is realized network management fast.
Background technology
Microwave communication be a kind of economy, flexibly, wireless transmission method easily, be applicable to various message capacities, communication distance and communication environment.Microwave communication utilizes the microwave channel transmission of digital signals, and its characteristics are as follows:
(1) communication frequency adopts microwave frequency band, the influence that not changed by weather, industrial interference and sunspot, and the reliability height, antenna size is little;
(2) can transmit multiple signals simultaneously, increase the microwave telecommunication devices frequency band, improve message capacity;
(3) installation is quick, flexible, and conveniently moving uses simply, and application is constantly expanded.
The RS232 interface is generally adopted in early stage monitoring of tools, maintenance, management, realizes telemanagement by the communication line of special use.The fast development of the Internet impels monitoring of tools, maintenance, management to adopt Ethernet interface, by computer internet realization manager with by the interconnection between the manager.Because Ethernet uses broadcast mechanism, there is the race problem of communication media layer, though adopt the transmission bandwidth of self adaptation 10M/100M, can satisfy different applied environments, there are many difficulties in transmission Ethernet bag on the 64kbit/s arrowband of serial.How the packets of information of transmitting on the 10M/100M bandwidth is compressed on the 64kbit/s arrowband and transmits, and can satisfy the response requirement of Ethernet; Adopt the multi-hop problem in which kind of routing algorithm solution serial transmission line; How come information between the transmission equipment, carry out the communication between the equipment, and finish mutual between the equipment by Ethernet, serial ports, microwave link.These problems are to realize the obstacle of the facility network Manifold technology development on the serial transmission line on the Internet always.
Some technical problems of transmission Ethernet bag on the 64kbit/s arrowband cause present many microwave transport equipments not to be supported in and realize telemanagement and maintenance on the computer internet, have hindered the development of self.Rapid propelling along with the Chinese national economy IT application process, the rapid expansion of field business such as telecommunication service, power monitoring, radio and television, be fit to mobile communication business or territorial scope wide, disperse cordless communication network---the application of microwave network also more and more widely.Administering and maintaining of numerous equipment is a very stubborn problem in the microwave communication network.Traditional microwave equipment administers and maintains general needs and reaches the spot and make amendment on device panel and be provided with, or carry notebook computer and pass through AccessPort, limit the efficient of plant maintenance greatly, can't guarantee the real-time requirement of some equipment debuggings, also wasted manpower, financial resources.For the microwave communication network of continuous expansion, the remote access and the management that can be implemented on the computer internet equipment become a technology that needs to be resolved hurrily now.
Summary of the invention
The purpose of this invention is to provide the implementation method of transmitting fast based on the Ethernet bag of microwave equipment network management system, computer network is mixed use with microwave link, adopt the Proxy Method of Simple Network Management Protocol SNMP and Web service, utilize the thought of compression in microwave link, to transmit the Ethernet data bag, thereby solve the message transmission problem in the microwave equipment network management system.
The present invention seeks to realize in the following manner:
Based on the quick implementation method of transmitting of the Ethernet bag of microwave equipment network management system, described method is moved based on the microwave equipment network management system, this system comprises a management station (1) and a plurality of microwave station (2), a microwave station (2) is made of a microwave equipment or many microwave equipments, every microwave equipment comprises indoor unit IDU (3) and outdoor unit ODU (4), the indoor unit IDU (3) of microwave equipment comprises monitoring of tools (5) and OAMAgent (6), described OAMAgent (6) comprises Agent module (61), Web server module (62) and serial communication modular (63), described monitoring of tools (5) comprises monitoring module (51) and serial communication modular (52), connect by cable (9) between indoor unit IDU (3) and the outdoor unit ODU (4), management station (1) is connected with a microwave equipment in the microwave station (2) by netting twine (8), many microwave equipments in the microwave station (2) interconnect by netting twine (8), interconnect by microwave link (7) between adjacent two microwave stations (2), realize that the quick forwarding concrete steps of Ethernet bag are as follows: as shown in Figure 1:
1. management station (1) sends the SNMP request data package by the Ethernet of standard, receive this request data package with a microwave equipment in the direct-connected microwave station of management station (1) (2), microwave equipment judges whether to visit local device by the Agent module (61) of the part of the OAMAgent (6) among its indoor unit IDU (3), if visit local microenvironment wave device, then Agent module (61) is checked management object information storehouse MIB, extract up-to-date status information of equipment, management station (1) is given by the Ethernet loopback in the packing back;
2. if not visit local microenvironment wave device, then transmit as follows, if in this microwave station multiple devices are arranged, Agent module (61) is transmitted to the interior coupled microwave equipment of same microwave station (2) by the Ethernet of standard, and this microwave equipment receives also analyzes packet, judges whether to visit local device, if, check management object information storehouse MIB, extract up-to-date status information of equipment, packing sends it back and should wrap to management station by the path of the transmission packet of mark;
If 3. do not have multiple devices in this microwave station or be not the visit local device, the Agent module (61) of microwave equipment is assembled into this SNMP request package the serial ports frame format of self-defining data form by the mode of compression, mark, and then be sent to monitoring of tools (5) part of the indoor unit IDU (3) of this microwave equipment by serial communication modular (63), be mapped to the microwave equipment that is forwarded to next microwave station (2) on the microwave link (7) of 64kbit/s then;
4. the monitoring of tools (5) of the indoor unit IDU (3) of microwave equipment receives and analyzes the SNMP request data package of compression in the next microwave station (2) from the microwave link (7) of 64kbit/s, judge whether to visit local device, if visit local microenvironment wave device, directly from the state information of monitoring of tools (5) the part collecting device of the indoor unit IDU (3) of this microwave equipment, packing sends it back and should wrap to management station (1) by the path of the transmission request data package of mark then;
5. if not visit local microenvironment wave device, and have only this microwave equipment in this microwave station (2), just stop transmitting;
If 6. in this microwave station (2) many microwave equipments are arranged, then send to the Agent module (61) of its OAMAgent (6) part by monitoring of tools (5) serial communication modular (52) partly of this microwave equipment indoor unit IDU (3), Agent module (61) decompresses to the SNMP request data package of this compression, revert to the Ethernet bag of standard, behind the extracted valid data, by the Ethernet mode of Agent module (61), be transmitted to next microwave equipment that links to each other with this microwave equipment in this microwave station (2) again by standard;
7. after the next stage microwave equipment receives the SNMP request data package, handle according to step as above 2.～6..
Beneficial effect:
The present invention has researched and developed the implementation method that a cover is transmitted fast based on the Ethernet bag of microwave equipment network management system, because the microwave communication network and the Ethernet of microwave station are different, the microwave link between each website is not suitable for transmitting Ethernet data.In order to realize management to the microwave communication network, we use embedded technology and add the OAMAgent part in the microwave equipments of microwave relay station, and integrated use Simple Network Management Protocol SNMP and serial communication protocol, finished the management system of a complete microwave communication network, realized that packet is transmitting on the 10M/100M Ethernet and transmitting on the 64kbit/s microwave link.The present invention adopts the thought of compression that packet is forwarded on the 64kbit/s microwave link from the 10M/100M Ethernet, and adopts the thought that decompresses will revert to the Ethernet bag of standard from the compressed data packets that the 64kbit/s microwave link receives.
The present invention by adopt ICP/IP protocol transmission network management information between management station and microwave equipment, realizes the Route Selection between the distinct device by the operation of microwave equipment network management system; On embedded ARM processor, use Simple Network Management Protocol (SNMP), performance, operational environment requirement according to equipment in the microwave line, realize the monitoring and the control of each parameter of microwave equipment, reaching the purpose of management station to the remote access and the control of microwave equipment, is a kind of solution preferably.
Adopt the present invention can bring a lot of convenience to realizing the network management of microwave relay net.At first, the angle from the user uses need not be reached the spot plant maintenance person at every turn, can be at this equipment of remote access Anywhere in the whole world, and monitor.In addition, adopt the web browsing mode during user access device, only need to click relevant device and just can long-rangely connect, simple and convenient, do not need special training just can use; Secondly, can adopt dual mode to the management of microwave equipment, a kind of is by the remote web mode, and another kind is by the management-plane on the microwave equipment.The keeper can select way to manage voluntarily according to condition at that time, can not delay the repairing time.Microwave equipment network management system of the present invention possesses telemanagement, maintenance function, can simplify loaded down with trivial details management, maintenance task, the operating cost of reduction equipment, to the service quality that improves the microwave communication network, strengthen the competitiveness of microwave communication network, the scope of application that further enlarges the microwave communication network will play positive impetus.The present invention can cut down expenses for enterprises and institutions, raises the efficiency, and increases profit; For society, can improve resource utilization and social total operational efficiency.Therefore, research and development of the present invention, use, popularization not only have realistic meaning, and far-reaching social effect is arranged.
Therefore the invention has the beneficial effects as follows that forwarding speed is fast, data are reliable, it is convenient to transplant, and is applicable to the problem that the microwave equipment network management system is transmitted fast to the Ethernet bag in serial transmission line.
Description of drawings
Fig. 1 is a flow chart of the present invention;
Fig. 2 is a microwave equipment network management system topological diagram;
Fig. 3 is the self-defining data form of SNMP;
Fig. 4 is the serial data frame format;
Fig. 5 is the serial communication program flow chart;
Fig. 6 is the formation structure chart of the indoor unit IDU of microwave equipment;
Fig. 7 is the set operational flowchart;
Fig. 8 is that the Ethernet data bag is forwarded to flow chart on the 64kbit/s time slot;
Fig. 9 is the Ethernet bag flow chart of standard that the Ethernet data bag of compression is reverted to.
Embodiment
One. overall implementation structure
Based on the quick implementation method of transmitting of the Ethernet bag of microwave equipment network management system, described method is moved based on the microwave equipment network management system, this system comprises a management station 1 and a plurality of microwave station 2, a microwave station 2 is made of a microwave equipment or many microwave equipments, every microwave equipment comprises indoor unit IDU3 and outdoor unit ODU4, the indoor unit IDU3 of a microwave equipment comprises monitoring of tools 5 and OAMAgent 6, described OAMAgent 6 comprises Agent module 61, Web server module 62 and serial communication modular 63, described monitoring of tools 5 comprises monitoring module 51 and serial communication modular 52, connect by cable 9 between indoor unit IDU3 and the outdoor unit ODU4, management station 1 is connected with a microwave equipment in the microwave station 2 by netting twine 8, microwave station 2 many interior microwave equipments interconnect by netting twine 8, interconnect by microwave link 7 between adjacent two microwave stations 2, microwave link 7 in order to ensure the 64kbit/s arrowband can be transmitted the Ethernet bag fast, guarantee in the same station or different station between microwave equipment can proper communication, the microwave equipment network management system needs the basic management function of a cover, comprises configuration management, performance management, fault management, system management and other management.
As shown in Figure 2, the network management software (comprising relevant database) is installed by management station 1 (Network Manager Station), by snmp protocol and http protocol mode the whole network microwave equipment is managed, check and various parameters are set, and receiving alarm information.
Microwave equipment in the same microwave station 2 connects (RJ45) by netting twine 8, adopts the Ethernet protocol of standard; Microwave equipment between the different microwave stations 2 is by microwave link 7 transmission data.Each is by the operation of the microwave equipment of pipe web server software, SNMP Agent (agency) software and serial communication software.
Management station 1 can sign in to the microwave equipment that directly links to each other with it by the IP address, adopts http protocol that it is managed and safeguards.
Management station 1 can also pass through snmp protocol, at first with the microwave equipment indoor unit IDU3 that directly links to each other in Agent module 61 communicate, data can be transmitted in the station and between the station, thus realization is to the management of whole network equipment.Consider the particularity of network topology structure, promptly the microwave link 7 by 64kbit/s transmits data between the station, therefore need carry out conversion to the standard snmp protocol, formulates special-purpose data format.Below specific implementation is described.
The monitoring of the microwave equipment that 1 pair of quilt of management station is managed mainly comprises the facility information of the microwave equipment that inquiry is managed, and the processing of the facility information and the warning information of the microwave equipment of being managed is set.
If management station 1 needs the parameter information of microwave equipment E among the inquiry microwave station 2S3, as shown in Figure 2.Undertaken by following step:
(1) management station 1 passes through snmp protocol, send the Query Information request to microwave equipment A, running on Agent module 61 in the OAMAgent 6 of microwave equipment A receives query requests and analyzes, if not inquiry local device (microwave equipment A) information, then Query Information request SNMP bag is transmitted, forwarding has both direction, direction is that the Ethernet according to standard is forwarded to microwave equipment F with Query Information request SNMP bag, Agent module 61 in the OAMAgent 6 of microwave equipment F is analyzed the back and is found it is not the information of sending out to this equipment, according to the quick retransmission protocol of Ethernet bag, after packet compressed, be forwarded to monitoring of tools 5 parts of microwave equipment F by serial communication modular 63, monitoring of tools 5 part mapping by microwave equipment F are to the microwave link 7 of 64kbit/s again, stop after being forwarded to the microwave equipment G among the microwave station 2S2 then.Another direction is carried out according to (2)-(7) step.
(2) the Agent module 61 in the OAMAgent 6 of microwave equipment A will be compressed and reduce the packets of information head the SNMP packet, assemble the packet in the quick retransmission protocol.Be transmitted to monitoring of tools 5 parts of microwave equipment A by serial communication modular 63.
(3) monitoring of tools 5 parts of microwave equipment A, receive query requests from serial ports after, thereby be mapped to the microwave equipment B that on the microwave link 7 of 64kbit/s the SNMP request package is transmitted to microwave station 2S4.
(4) after monitoring of tools 5 parts of microwave equipment B receive query requests, by analysis, find it is not inquiry local device information (microwave equipment B), query requests is sent to the Agent module 61 in the OAMAgent 6 of microwave equipment B by serial communication modular 52.
(5) the Agent module 61 in the OAMAgent 6 of microwave equipment B is carried out data transaction with the SNMP request package that receives compression, and is encapsulated among the SNMP PDU, and the Ethernet by standard is transmitted to microwave equipment C at last.
(6) the Agent module in the OAMAgent 6 of microwave equipment C 61 receives request and analyzes, find it is not inquiry local device information (microwave equipment C), then Query Information request SNMP bag is transmitted, forwarding has both direction, a direction is to send in monitoring of tools 5 parts of microwave equipment C by the serial communication modular 63 in the OAMAgent 6 of microwave equipment C, and then be mapped on the microwave link 7 of 64kbit/s, after being transmitted to microwave equipment H among the microwave station 2S5, request packet stops.Another direction is carried out according to (7)-(8) step.
(7) the Agent module 61 in the OAMAgent 6 of microwave equipment C is transmitted to microwave equipment D by the Ethernet of standard with request packet.Agent module 61 in the OAMAgent 6 of microwave equipment D receives request and analyzes, find it is not inquiry local device information (microwave equipment D), then Query Information request SNMP bag is sent to monitoring of tools 5 parts of microwave equipment D by serial communication modular 63, monitoring of tools 5 part mapping by microwave equipment D are to the microwave link 7 of 64kbit/s then, and request packet is transmitted to microwave equipment E among microwave station 2 S3.
(8) monitoring of tools 5 parts of microwave equipment E are received the request packet that microwave equipment D sends, analyze and find it is inquiry local device information (microwave equipment E), collect the parameter information of microwave equipment E then, and response message is recycled to management station by original path.When return information transmits between the station, adopt the encapsulation of SNMPSet message, final microwave equipment is replied data by SNMP Trap message to PC.
(9) monitoring of tools 5 parts of microwave equipment E are with the parameter information, the facility information that collect, compress and reduce header packet information, assemble the packet in the quick retransmission protocol, be transmitted to the microwave equipment D of microwave station S4 again by its monitoring of tools 5 part mapping to the microwave link 7 of 64kbit/s.
(10) monitoring of tools 5 parts of microwave equipment D receive packets of information, the analysis found that it is the information that mails to management station, so be sent to the Agent module 61 in the OAMAgent 6 of microwave equipment D by serial communication modular 52, Agent module 61 is transmitted to microwave equipment C by the Ethernet of standard.
(11) the Agent module in the OAMAgent 6 of microwave equipment C 61 receives packets of information, find it is the echo message that mails to management station 1 by analyzing, owing to process of transmitting, can send the path by mark from the request package that management station 1 sends, event sends back and should wrap is to transmit by original route, so there is not the forwarding of both direction herein.So the Agent module 61 of microwave equipment C sends microwave equipment B to according to the Ethernet of standard.
(12) the Agent module in the OAMAgent 6 of microwave equipment B 61 receives packets of information, finds it is the echo message that sends to management station 1 by analyzing, and then compresses and reduces the packets of information head, assembles the packet in the quick retransmission protocol.Send monitoring of tools 5 parts of microwave equipment B to by serial communication modular 63, be transmitted to the microwave equipment A of microwave station 2S1 by monitoring of tools 5 part mapping to the microwave link 7 of 64kbit/s then.
(13) monitoring of tools 5 parts of microwave equipment A receive packets of information, the analysis found that it is the echo message that sends to management station 1, so send to Agent module 61 in the OAMAgent 6 of microwave equipment A by serial communication modular 52, the SNMP bag of 61 pairs of compressions of Agent module decompresses, revert to the SNMP packets of information of standard, directly be transmitted to management station 1 by Ethernet.
Similarly, if management station 1 need be provided with the parameter information of microwave equipment E, can being set, request be sent to microwave equipment E by same step.
If microwave equipment E has warning information to produce, initiatively send data to microwave link 7 and Ethernet both direction because this moment microwave equipment E and do not know the microwave equipment that management station 1 is connected.Warning information is constantly transmission in whole microwave communication network, till arriving management station 1.
What need supplementary notes is, the Agent module 61 in the OAMAgent 6, and Web server module 62 and serial communication modular 52 or 63 adhere to three standalone modules separately, simultaneously operation.Do not have direct data communication between Agent module 61 and the Web server module 62, and carry out data communication by named pipes mechanism between Agent module 61 (or Web server module 62) and serial communication modular 52 or 63.
Named pipes (named pipe, FIFO) is the popularization of general pipeline (pipe), has overcome the nameless restriction of pipeline, makes the process of affinity-less relation can adopt the communication mechanism of first in first out to communicate equally.FIFO is different from general pipeline part and is that it provides a pathname related with it, is present in the file system with the document form of FIFO.First in first out (First In First Out) is followed in the FIFO strictness, always reads from beginning return data, and writing then of they added data to end, and they do not support to operate such as l seek document alignments such as ().
Redefining of two .SNMP agreements
Between the microwave link 7 of 10M/100M Ethernet and 64kbit/s, communicate, transmit data, need by self-defining quick retransmission protocol, be implemented in the SNMP packets of information of transmission compression on the branch road of 64kbit/s, so need the data format of Simple Network Management Protocol SNMP be redefined.
Snmp protocol is used for two occasions in the whole system communication process:
1. the communication between management station 1 and the direct associated devices (being connected) by the Ethernet interface in the microwave equipment OAMAgent 6.Management station 1 sends the data query request or parameter request is set to Agent module 61 with the PDU form of Set operation, and Agent module 61 replys the data query request with the Trap form or answer is provided with parameter request.Set operation is at certain management object, is provided with according to the numerical value of appointment.Numerical value to appointment in the microwave equipment network management system redefines, and form as shown in Figure 3.
Sign: take 1 byte.0 expression sends a warning message; 1 expression data query request or the request of answer data query; Parameter request is set in 2 expressions or answer is provided with parameter request.
Purpose terminal number source terminal number: adopt the storage of packed BCD sign indicating number.As 234567, expression purpose terminal number is: 423 (non-234), source terminal number are: 567.When management station 1 sent request, source terminal number was changed to 0, and the purpose terminal number is for being inquired about or be set up the terminal number of equipment; When Agent module 61 was replied data, source terminal was number for being inquired about or be set up the terminal number of equipment, and the purpose terminal number is 0b0.
OID: identity management object.Therefore only management object in the native system is all expanded under 1.3.6.1.4.1.1199, need indicate latter two node serial number and can distinguish different management objects.
Data: length is by the decision of OID value, and different management objects may have different types, so the length of its value may be different.
In addition, the microwave equipment that directly links to each other with management station 1 is provided with sign, when microwave equipment receives the data of management station's 1 transmission, enables sign; When microwave equipment receives request msg or when Ethernet interface receives the request msg of other device forwards from serial ports, clear flag.So just can determine which platform equipment directly links to each other with management station 1,, should directly transmit, and not re-send to other microwave equipment to management station 1 if this equipment receives the answer data from other equipment.
2. the data forwarding between the equipment in the microwave station 2.When equipment need be transmitted data in the microwave station 2, by Set PDU form to other microwave equipment broadcast datas.The OID that uses is: 1.3.6.1.4.1.1199.10.1.0, disregard the response message of Set PDU form here.
Three. the serial communication protocol analysis
No matter the information that receives is sent to that microwave equipment in the microwave network, the communication in indoor unit IDU3 inside all needs to transmit by serial ports.Link to each other by serial ports between the monitoring of tools 5 of indoor unit IDU3 inside and the OAMAgent 6, be exactly specifically in the OAMAgent 6 employed serial ports link to each other with the serial ports that uses in the monitoring of tools 5.The two can both support asynchronous communication preferably, therefore adopts the asynchronous serial communication mode here.
The serial data frame format, as shown in Figure 4.Can transmit configuration information and response message two class data, wherein configuration information sends by the serial communication modular in the OAMAgent 6 63, and the serial communication modular 52 in the monitoring of tools 5 receives.The transmission direction of response message is opposite with configuration information.
Each fields specify of Frame is as follows:
(1) start bit: value is 0xcc or 0xc3, and wherein 0xcc represents configuration information, and 0xc3 represents response message.
(2) length position: command bit and data bit length sum in the expression frame.
(3) command bit: be used for the function of identification frames.
(4) data bit: configuration information or response message.
(5) verification and: command bit, data bit by the byte addition, are not calculated and are overflowed, get two bytes.
(6) stop bits: represent a frame end, get fixed value 0xf3.
Analyze by the parameter that need be provided with microwave equipment, the defined order position is as follows with the corresponding relation that parameter can be set:
0x41: link transmission capacity (LinkCapacity);
0x42: device end number (TermNum);
0x43: link No. (LinkID);
0x44: the operating wave Taoist monastic name (ODUChannel) of outdoor unit ODU;
0x45: the collection of letters bandwidth (ODURxBand) of outdoor unit ODU;
0x49: the transmitting power of outdoor unit ODU (ODUTxPower);
0x4a: the transmitting power ON/OFF (ODUTxMute) of outdoor unit ODU;
The masked state of 0x4b:E1 mouth (E1Mask);
0x4c: the wrapped state (RMTE1LBK) of opposite end E1 mouth;
0x4d: withdraw from the loopback setting (EXITRMTE1LBK) of opposite end E1 mouth;
0x4e: alarm threshold (BERALMTH);
0x4f: the wrapped state of indoor unit IDU (IDULoopback);
0x50: the test pattern of equipment (Tes tMode);
0x51: the date (IDUDate) that indoor unit IDU is set;
0x52: the time (IDUTime) that indoor unit IDU is set;
0x5b: alarm buzzer ON/OFF (ALMBeep);
0x5c: error code counting zero clearing (CLRERRCount);
Need to prove because demand analysis stage is not accurate enough to the management object analysis of microwave equipment, redundancy is arranged when realizing, therefore the numbering of above order is not continuous, does not for example use orders such as 0x46,0x47.
Serial communication modular 63 runs on the OAMAgent 6, monitors serial equipment and pipeline, can realize data transmitted in both directions between the OAMAgent 6 of microwave equipment and monitoring of tools 5.This program work flow chart now is analyzed as follows each functions of modules as shown in Figure 5:
1. initialization
Mainly comprise opening conduits, open serial ports, tasks such as serial ports are set.
(1) opening conduits com_out, serial communication modular 63 are from this pipeline reading of data, and Agent module 61 (or Web server module 62) writes data to this pipeline.
com_out＝open(pipe_com_out，O_RDWR|O_NONBLOCK)；
(2) opening conduits snmp_out, serial communication modular 63 writes data to this pipeline, and Agent module 61 is from this pipeline reading of data.
snmp_out＝open(pipe_snmp_out，O_RDWR|O_NONBLOCK)；
(3) open serial ports uart, serial communication modular 52 or 63 sends request by this serial ports to monitoring of tools 5, and collects replying of monitoring of tools 5 loopbacks.
uart＝open(″/dev/tts/1″，O_RDWR)；
(4) serial ports is set, mainly finishes by structure termio is set.This structure setting is very complicated, and common parameter has baud rate, data bit, parity check bit, position of rest etc.
struct?termio{
unsigned?short?c_iflag；/*input?mode?flags*/
unsigned?short?c_oflag；/*output?mode?flags*/
unsigned?short?c_cflag；/*control?mode?flags*/
unsigned?short?c_lflag；/*local?mode?flags*/
unsigned?char?c_line；/*line?discipline*/
unsigned?char c_cc[NCC]；/*control?characters*/
}；
2. judged whether that data are read-write
Judge by select () mechanism whether pipeline com_out and serial ports uart have data readable.
select_ret＝select((uart＞com_out)？(uart+1)：(com_out+1)，&rs，NULL，NULL，&t?imeout)；
3. there are data readable in the pipeline
If pipeline com_out has data readable, illustrate that Agent module 61 or Web server 62 are provided with request, need be provided with the microwave equipment parameter.At this moment, serial communication modular 52 or 63 reads pipeline com_ou t data and analyzes, and according to serial communication protocol data is encapsulated again then, and sends to monitoring of tools 5 request is set by serial ports.It is as follows respectively with the code of writing serial ports to read pipeline:
fet＝read(com_out，(char*)buf+count，len)；
framelen＝write(uart，frame，rlen+5)；
4. there are not data readable in the pipeline
If pipeline com_out does not have data readable, illustrating in the serial ports buffering area has data readable.At this moment, monitoring of tools 5 has alarm or other informational needs to send to OAMAgent 6.Serial communication modular 52 or 63 reads the serial ports buffering area, and the data of receiving are analyzed, and classification is handled.It is as follows respectively with the code of writing pipeline to read serial ports:
ret＝read(uart，(char*)buf+count，len)；
write(snmp_out，rframe，rframe[1]+5)；
Four. the intercommunicating realization of microwave equipment indoor unit IDU3
Be implemented on the 64kbit/s arrowband and transmit data, transmit the Ethernet bag fast, need by monitoring of tools 5 part mapping inside the microwave equipment to the microwave link 7 of 64kbit/s, to realize the quick forwarding of Ethernet bag.Introduce the intercommunication process of indoor unit IDU3 below, the software of indoor unit IDU3 is made up of two parts, monitoring of tools 5 and OAMAgent 6, as shown in Figure 6.
The two only communicates by serial ports, and serial communication adopts self-defined serial communication protocol.Serial communication modular 52 or 63 is responsible for receiving or send data from serial ports.
(1) data that serial communication modular 52 is received are handled, and select to continue to transmit or reply request of data.
(2) receive the data that the opposite end sends, select to continue to transmit or reply request of data.
(3) initiatively produce warning information, and transmit, thereby the whole network is broadcasted to both direction.
In the OAMAgent 6 Agent module 61, mainly finish following function:
(1) data that serial communication modular 63 is received are handled, and select to continue to transmit or reply request of data.
(2) receive the data that other microwave equipments send in the microwave station 2, select to continue to transmit or reply request of data.
(3) packets of information is carried out compression and decompression, assembling ethernet frame structure or serial ports frame structure.
Five. act on behalf of 61 designs of Agent module and realize
Finish communicating by letter between management station 1 and the microwave equipment, need the Agent module 61 in the OAMAgent 6 to analyze the SNMP packet, compression and reduction header packet information are to realize the transmitting Ethernet data bag fast.Agent module 61 is that SNMP Agent is on the basis of net-snmp software kit, realizes by secondary development, uses C language compilation Agent module 61.Outside Get, the Set request that Agent after the expansion can response management station 1 sends, can also and be converted to the Trap message, be sent to management station 1 from the warning information of serial ports receiving equipment monitoring 5.
Management information bank MIB design is mainly finished in the realization of SNMP Agent expanded function, and 61 expansions of Agent module.
● the Get request that receiving management station 1NMS sends, inquiry is also responded information requested;
● the Set request that receiving management station 1MS sends is provided with monitoring of tools 5 by serial ports;
● whether surveillance equipment monitoring 5 has alarm to produce, and sends a warning message to management station 1 by the Trap message.
● packets of information is carried out compression and decompression, assembling ethernet frame structure or serial ports frame structure.
The Agent module 61 of acting on behalf of after the expansion has increased by two files, i.e. .c file (WJTNMS.c) and .h file (WJTNMS.H), and storage directory is "/var/ftp/pub/net-snmp-5.4.2.1/agent/mibgroup/ ".Agent module 61 can perhaps directly be write with reference to the example file in the net-snmp software kit by the auxiliary basic framework that generates of instrument mib2c.
Need to prove that the mib2c order is provided by the net-snmp software kit, need move under Redhat Linux9.0.When therefore generating the mib2c order, the compiler (not being arm-linux-gcc) that is used for compiling net-snmp must be able to be created in the code that moves under Redhat Linux 9.0 systems.In addition, mib2c orders based on the perl script, and needs could correct execution after the perl module is installed.
A kind of method in back is adopted in this exploitation, and example file (example.c and example.h) is positioned under the catalogue "/var/ftp/pub/net-snmp-5.4.2.1/agent/mibgroup/ ".
1.Init module
The init module is finished agency's function of initializing by function void init_WJTNMS (void), mainly comprise registration expansion MIB, initialization custom variable, timer etc. is set.
The branch of the MIB of expansion in existing MIB tree is by following variable-definition:
oid?WJTNMS_variables_oid[]＝{1，3，6，1，4，1，1199}；
Promptly increase a node WJTNMS under iso.org.dod.internet.private.enterprises branch, it is numbered 1199.
With an array define expansion all leaf nodes:
struct?variab1e2?WJTNMS_variab1es[]＝{
{LinkCapacity，ASN_OCTET_STR，RWRITE，var_WJTNMS，2，{1，1}}，
......
{IPAddress，ASN_IPADDRESS，RONLY，var_WJTNMS，2，{1，8}}，
......
{LinkI9，ASN_INTEGER，RWRITE，var_WJTNMS，2，{1，21}}，
{ErrorRate，ASN_OCTET_STR，RONLY，var_WJTNMS，2，{2，1}}，
......
{ODUTEMP，ASN_INTEGER，RONLY，var_WJTNMS，2，{2，10}}，
{ALARM，ASN_OCTET_STR，RONLY，var_WJTNMS，2，{3，1}}
}；
In the array each node is all described according to the order of magic number, types of variables, access limit, call back function, variable-length and variable name suffix.
2.Get module
Get (reading) operation is one of basic operation of SNMP, is used for the inquiry to microwave equipment information.Realize the Get function by function var_WJTNMS among the file WJTNMS.c, function prototype is:
u_char*var_WJTNMS(struct?variab1e*vp，oid*name，size_t*length，
int?exact，size_t?*var_len，
WriteMethod**write_method)
This function relatively simple for structure, main contents are a switch-case structure, management object of each branch process.
In OAMAgent 6, use the various parameter informations of binary file snmp_file memory device monitoring 5, totally 55 bytes.Monitoring of tools 5 regularly sends this file of Data Update by serial ports, has guaranteed the accuracy of data to a certain extent.After Agent module 61 is received the Get request, read file snmp_file and obtain newer parameter information, and reply the Get request.
3.Set module
Set (writing) operation is used to be provided with the parameter information of monitoring of tools 5, realizes by the function of writing of title similar " write_**** ".For different management objects, generally need definition respectively to write function and be used for various parameter settings.The main framework of this function is as follows:
int?wfite_****(int?action，u_char*var_va?l，u_char?var_val_type，
size_t?var_val_len，u_char?*statP，
oid*name，size_t?name_len)
{
switch(action)
{ case?RESERVE1： break；
case?RESERVE2： break；
case?FREE： break；
case?ACTION： break；
case?UNDO： break；
case?COMMIT： break；
}
return?SNMP_ERR_NOERROR；
}
Wherein, the switch-case structure comprises 6 stages, i.e. RESERVE1, RESERVE2, FREE, ACTION, UNDO and COMMIT.Can be assigned to these 6 different phases to the setting operation of managed object and finish, in general the task of finishing is as follows each stage:
RESERVE1: type of error inspection;
RESERVE2: the resource that application needs;
FREE: discharge the resource of distributing;
ACTION: carry out setting operation;
UNDO: cancel the operation of finishing;
COMMIT: submit the request that is provided with to.
Fig. 7 has described the execution flow process in 6 stages.Wherein, have only the ACTION Stage code to run succeeded fully, the COMMIT stage could carry out.The code in COMMIT stage should be safe, and the code that may make mistakes should be placed in the ACTION stage, so that passes through the UNDO stage and recover.
4.Notification module
The notification module mainly by sending the Trap message, is handled warning information.Function send_v2trap () can send to the 1NMS of management station with Trap information automatically according to the address of configuration file snmpd.conf appointment.
Six. the performing step that the Ethernet bag is transmitted fast on the serial transmission line
Transmission Ethernet data bag on the 64kbit/s arrowband, need compress and reduce, decompress it, the ethernet frame format that is assembled into serial is again transmitted, introduce the performing step that the Ethernet bag is transmitted fast below: as shown in Figure 1, realize that the quick forwarding concrete steps of Ethernet bag are as follows:
1. management station (1) sends the SNMP request data package by the Ethernet of standard, receive this request data package with a microwave equipment in the direct-connected microwave station of management station (1) (2), microwave equipment judges whether to visit local device by the Agent module (61) of the part of the OAMAgent (6) among its indoor unit IDU (3), if visit local microenvironment wave device, then Agent module (61) is checked management object information storehouse MIB, extract up-to-date status information of equipment, management station (1) is given by the Ethernet loopback in the packing back;
2. if not visit local microenvironment wave device, then transmit as follows, if in this microwave station multiple devices are arranged, Agent module (61) is transmitted to the interior coupled microwave equipment of same microwave station (2) by the Ethernet of standard, and this microwave equipment receives also analyzes packet, judges whether to visit local device, if, check management object information storehouse MIB, extract up-to-date status information of equipment, packing sends it back and should wrap to management station by the path of the transmission packet of mark;
If 3. do not have multiple devices in this microwave station or be not the visit local device, the Agent module (61) of microwave equipment is assembled into this SNMP request package the serial ports frame format of self-defining data form by the mode of compression, mark, and then be sent to monitoring of tools (5) part of the indoor unit IDU (3) of this microwave equipment by serial communication modular (63), be mapped to the microwave equipment that is forwarded to next microwave station (2) on the microwave link (7) of 64kbit/s then;
4. the monitoring of tools (5) of the indoor unit IDU (3) of microwave equipment receives and analyzes the SNMP request data package of compression in the next microwave station (2) from the microwave link (7) of 64kbit/s, judge whether to visit local device, if visit local microenvironment wave device, directly from the state information of monitoring of tools (5) the part collecting device of the indoor unit IDU (3) of this microwave equipment, packing sends it back and should wrap to management station (1) by the path of the transmission request data package of mark then;
5. if not visit local microenvironment wave device, and have only this microwave equipment in this microwave station (2), just stop transmitting;
If 6. in this microwave station (2) many microwave equipments are arranged, then send to the Agent module (61) of its OAMAgent (6) part by monitoring of tools (5) serial communication modular (52) partly of this microwave equipment indoor unit IDU (3), Agent module (61) decompresses to the SNMP request data package of this compression, revert to the Ethernet bag of standard, behind the extracted valid data, by the Ethernet mode of Agent module (61), be transmitted to next microwave equipment that links to each other with this microwave equipment in this microwave station (2) again by standard;
7. after the next stage microwave equipment receives the SNMP request data package, handle according to step as above 2.～6..
The performing step that the Ethernet data bag is forwarded on the 64kbit/s branch road is as follows, as shown in Figure 8:
1. the packet that receives from Ethernet of microwave equipment, the Agent module 61 of OAMAgent 6 parts of its indoor unit IDU3 is opened this packet, check whether destination address is local packets, if local packets is then carried out this locality to packet and handled; Otherwise transmit.
2., then directly transmit by the Ethernet in this microwave station 2 if next jumping of Zhuan Faing is another microwave equipment in this microwave station 2.If next jumping of transmitting is the next microwave station 2 in the microwave line, then check whether be the Ethernet data bag, if not then stop transmitting, otherwise this Ethernet data bag is compressed, be mapped to afterwards in the time slot of a 64kbit/s on the microwave line, the packet compression process is carried out according to following 3-9 step.
3. SNMP or the Http packet to receiving from Ethernet only extracts active data part in the ethernet frame structure, and other parts abandon.Forwarding next step internetworking layer to handles.
4. in internetworking layer IP stem, the microwave equipment of being managed between a directorial area of regulation microwave equipment network management system is less than 255, so device number is distinguished with a byte also less than 255 under the same network address in the IP address.So only keep the minimum byte of purpose IP address of IP stem and a minimum byte of source IP address, and No. 6 TCP and No. 17 udp protocols of protocol fields.Other parts abandon in the IP stem, forward next step transport layer process to.
5. transport layer mainly is the processing to TCP and UDP stem, adopt a byte representation source port number and destination slogan (respectively accounting for 4 bits), different agreement with each layer of byte representation, wherein the D7 bit is distinguished TCP and udp protocol, the D6 bit is distinguished SNMP and Http agreement, and the D5-D0 bit is represented the difference in functionality in the snmp protocol, perhaps distinguishes the difference in functionality in the Http agreement, remainder keeps in the TCP stem, and other parts abandon in the UDP stem.
6. MIB library information and the identity management object OID that extracts in the data compressed.Management object in the native system is the child node on the 1.3.6.1.4.1.1199, can reach 60000 at most, and 1.3.6.1.4.1.1199 is dropped as default value, and OID just can be with two byte representations.
7. the data message after will compressing is formed self-defining compression SNMP packet.As shown in Figure 3.
8. self-defining compression SNMP packet is inserted into the data bit field in the serial ports frame structure, as shown in Figure 4.And send monitoring of tools 5 parts to by serial ports.
9. monitoring of tools 5 parts are after serial ports is received the SNMP packet of self-defined compression, according to the time slot requirement of pulse modulation PCM system in the communication, are mapped in the 64kbit/s microwave line on the branch road.
The performing step that the Ethernet data bag of compression is reverted to from the 64kbi t/s microwave branch road the standard ethernet bag is as follows, as shown in Figure 9:
1. monitoring of tools 5 parts receive the SNMP or the Http packet of compression from 64kbit/s microwave link 7, send to Agent module 61 in the OAMAgent 6 by serial communication modular 52 then.Agent module 61 is finished the SNMP of compression or the recovery of Http packet, and recovery process is carried out according to the 2-7 step.
2.Agent module 61 is extracted the data item in the data bit field from the serial ports frame structure, as shown in Figure 4.
3. according to self-defining compression SNMP packet structure, as shown in Figure 3 in the OID value, the OID that regains one's integrity promptly adds default identification management object (OID): the 1.3.6.1.4.1.1199 value.
4. according to source, destination slogan value in the self-defining compression SNMP structure, recover the stem of Transmission Control Protocol or udp protocol.
5. according to source, purpose IP address value in the self-defining compression SNMP structure.Recover the IP stem in the internetworking layer.
6. according to the agreement sign in the self-defining compression SNMP structure, recover protocol fields and the SNMP or the Http function type of each layer of computer network.
7. according to the mac address of this locality and the mac address of next jumping, recover each field information in the link-layer frame structure, the Ethernet bag of forming is sent on the Ethernet by Agent module 61.
Claims (3)
1. based on the quick implementation method of transmitting of the Ethernet bag of microwave equipment network management system, it is characterized in that: described method is moved based on the microwave equipment network management system, this system comprises a management station (1) and a plurality of microwave station (2), a microwave station (2) is made of a microwave equipment or many microwave equipments, every microwave equipment comprises indoor unit IDU (3) and outdoor unit ODU (4), the indoor unit IDU (3) of microwave equipment comprises monitoring of tools (5) and OAMAgent (6), described OAMAgent (6) comprises Agent module (61), Web server module (62) and serial communication modular (63), described monitoring of tools (5) comprises monitoring module (51) and serial communication modular (52), connect by cable (9) between indoor unit IDU (3) and the outdoor unit ODU (4), management station (1) is connected with a microwave equipment in the microwave station (2) by netting twine (8), many microwave equipments in the microwave station (2) interconnect by netting twine (8), interconnect by microwave link (7) between adjacent two microwave stations (2), realize that the quick forwarding concrete steps of Ethernet bag are as follows:
1. management station (1) sends the SNMP request data package by the Ethernet of standard, receive this request data package with a microwave equipment in the direct-connected microwave station of management station (1) (2), microwave equipment judges whether to visit local device by the Agent module (61) of the part of the OAMAgent (6) among its indoor unit IDU (3), if visit local microenvironment wave device, then Agent module (61) is checked management object information storehouse MIB, extract up-to-date status information of equipment, management station (1) is given by the Ethernet loopback in the packing back;
2. if not visit local microenvironment wave device, then transmit as follows, if in this microwave station multiple devices are arranged, Agent module (61) is transmitted to the interior coupled microwave equipment of same microwave station (2) by the Ethernet of standard, and this microwave equipment receives also analyzes packet, judges whether to visit local device, if, check management object information storehouse MIB, extract up-to-date status information of equipment, packing sends it back and should wrap to management station by the path of the transmission packet of mark;
If 3. do not have multiple devices in this microwave station or be not the visit local device, the Agent module (61) of microwave equipment is assembled into this SNMP request package the serial ports frame format of self-defining data form by the mode of compression, mark, and then be sent to monitoring of tools (5) part of the indoor unit IDU (3) of this microwave equipment by serial communication modular (63), be mapped to the microwave equipment that is forwarded to next microwave station (2) on the microwave link (7) of 64kbit/s then;
4. the monitoring of tools (5) of the indoor unit IDU (3) of microwave equipment receives and analyzes the SNMP request data package of compression in the next microwave station (2) from the microwave link (7) of 64kbit/s, judge whether to visit local device, if visit local microenvironment wave device, directly from the state information of monitoring of tools (5) the part collecting device of the indoor unit IDU (3) of this microwave equipment, packing sends it back and should wrap to management station (1) by the path of the transmission request data package of mark then;
5. if not visit local microenvironment wave device, and have only this microwave equipment in this microwave station (2), just stop transmitting;
If 6. in this microwave station (2) many microwave equipments are arranged, then send to the Agent module (61) of its OAMAgent (6) part by monitoring of tools (5) serial communication modular (52) partly of this microwave equipment indoor unit IDU (3), Agent module (61) decompresses to the SNMP request data package of this compression, revert to the Ethernet bag of standard, behind the extracted valid data, by the Ethernet mode of Agent module (61), be transmitted to next microwave equipment that links to each other with this microwave equipment in this microwave station (2) again by standard;
7. after the next stage microwave equipment receives the SNMP request data package, handle according to step as above 2.～6..
2. the implementation method of transmitting fast based on the Ethernet bag of microwave equipment network management system as claimed in claim 1, it is characterized in that: microwave equipment is by the SNMP request data package of the Ethernet reception of standard, the Agent module (61) of microwave equipment is by compression, the mode of mark is assembled into this SNMP request package the serial ports frame format of self-defining data form, its step is as follows: extract active data part in the ethernet frame structure, and a minimum byte of the purpose IP address of reservation IP stem and a minimum byte of source IP address, and No. 6 TCP and No. 17 udp protocols of protocol fields, adopt a byte representation source port number and destination slogan, different agreement with each layer of byte representation, keep remainder in the TCP stem, and other parts abandon in the UDP stem, MIB library information and the identity management object OID that extracts in the data compressed, data message after the compression is formed self-defining compression SNMP packet, then will this self-defining compression SNMP packet be inserted into the data bit field in the serial ports frame structure, and send monitoring of tools (5) part of microwave equipment indoor unit IDU (3) to by serial ports, monitoring of tools (5) part is after serial ports is received the SNMP packet of self-defined compression, time slot requirement according to pulse modulation PCM system in the communication is mapped on the 64kbit/s microwave link (7).
3. the implementation method of transmitting fast based on the Ethernet bag of microwave equipment network management system as claimed in claim 1, it is characterized in that: the SNMP request data package that goes up compression from 64kbit/s microwave link (7) reverts to the standard ethernet bag, this compressed data packet is decompressed, its step is as follows: monitoring of tools (5) part among the indoor unit IDU (3) of microwave equipment, receive the SNMP request data package of compression from 64kbit/s microwave link (7), send to the Agent module (61) in the OAMAgent (6) of this microwave equipment indoor unit IDU (3) by serial communication modular (52), Agent module (61) is extracted the data item in the data bit field from the serial ports frame structure, according to self-defining compression SNMP packet structure, the OID that regains one's integrity, again according to the source in the self-defining compression SNMP structure, destination slogan value, recover the stem of Transmission Control Protocol or udp protocol, and according to the source in the self-defining compression SNMP structure, purpose IP address value, recover the IP stem in the internetworking layer, then according to the agreement sign in the self-defining compression SNMP structure, recover the protocol fields and the SNMP function type of each layer of computer network, recover each field information in the link-layer frame structure at last, by Agent module (61) the Ethernet bag of forming is sent on the Ethernet again.
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