CN100334867C - Method for assuring reliability of data package transmission in simple network management protocol - Google Patents
Method for assuring reliability of data package transmission in simple network management protocol Download PDFInfo
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- CN100334867C CN100334867C CNB021494398A CN02149439A CN100334867C CN 100334867 C CN100334867 C CN 100334867C CN B021494398 A CNB021494398 A CN B021494398A CN 02149439 A CN02149439 A CN 02149439A CN 100334867 C CN100334867 C CN 100334867C
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Abstract
The present invention relates to a TRAP data packet transmission reliability guaranteeing method in the simple network management protocol (SNMP). SNMP TRAP data packets are transmitted based on the UDP protocol; the phenomena of data packet loss always occur in the transmission process because the UDP protocol does not have a checking and retransmission mechanism, and thereby, the integrality of data transmission can not be guaranteed, which means that the consistency of TRAP data between a network administrator and equipment can not be guaranteed. The method of the present invention is used for realizing an SNMP TRAP verifying mechanism to ensure that TRAP loss can be discovered in time so as to require retransmission in the SNMP TRAP transmission process. The present invention comprises steps that a sending source terminal allocates a flow number to each TRAP data packet according to a sending sequence continuously, wherein the flow number is inserted into the VB field of the TRAP data packet so that the flow number and the TRAP data packet are sent together; a receiving terminal judges the continuity of the numbers of the received TRAP data packets; the sending source terminal is asked to retransmit the TRAP data packets of which the numbers are missed when the numbers of the TRAP data packets are discontinuous.
Description
Technical field
The present invention relates to a kind of network management technology, relate to a kind of in Simple Network Management Protocol (SNMP) or rather, based on the TRAP of User Datagram Protoco (UDP) (UDP) bag (in five orders of SNMP one, initiated by equipment, the active that is mainly used in warning information reports) method for ensuring reliability that transmits.
Background technology
SNMP TRAP packet is based on that udp protocol transmits, and because udp protocol itself does not have check and retransmission mechanism, the phenomenon of lost data packets will often take place in transport process, promptly can not guarantee the integrality that data transmit, also just can not guarantee the consistency of TRAP data between webmaster and the equipment.
Summary of the invention
The objective of the invention is to design the method for ensuring reliability that packet transmits in a kind of Simple Network Management Protocol, be used to realize the verification scheme of SNMP TRAP, can guarantee that SNMP TRAP is in transport process, if lose phenomenon, can in time find and require to retransmit, thus the consistency of TRAP data between assurance webmaster and the equipment.
Technical scheme of the present invention is not to guarantee SNMP TRAP packet loss not in transport process, but guarantees that SNMP TRAP can be received side and in time find behind packet loss, and then requires to send source device side (Agent: be the equipment that uses snmp protocol) and retransmit.
The technical scheme that realizes the object of the invention is such: the method for ensuring reliability that packet transmits in a kind of Simple Network Management Protocol is characterized in that comprising:
A. send the source end and carry out serial number for each TRAP packet by sending order, this numbering sends with the TRAP packet;
B. receiving terminal is judged the numbering continuity that receives the TRAP packet, when the numbering of TRAP packet is discontinuous, requires transmission source end to retransmit the TRAP packet that numbering lacks, and specifically comprises:
B1. from the TRAP packet that receives, extract numbering;
B2. the numbering in numbering that will extract and the verification buffering area compares, and handles according to comparative result, comprises;
B21. when the numbering that extracts when numbering in the verification buffering area equates, do in the deletion verification buffering area should numbering operation;
B22. when the numbering in numbering that extracts and the verification buffering area is unequal, judge further whether the benchmark parameter of numbering is the initialization value of setting;
B23. when the benchmark parameter of numbering during not for the initialization value of setting, further the judgement benchmark parameter of numbering adds 1 whether equal the current numbering that extracts from the TRAP packet;
B24. add 1 when being not equal to the current numbering that from the TRAP packet, extracts when the benchmark parameter of numbering, judge that further the current numbering that extracts is whether less than the benchmark parameter of numbering from the TRAP packet;
B25. when the current numbering that from the TRAP packet, extracts during, the numbering that lacks between the benchmark parameter of numbering and the current numbering that extracts from the TRAP packet is write in the described verification buffering area greater than the benchmark parameter of numbering;
B26. among step b22, the b23, when the benchmark parameter of numbering is the initialization value of setting, perhaps Bian Hao benchmark parameter is not for the initialization value of setting but the benchmark parameter of numbering adds 1 when equaling the current numbering that extracts from the TRAP packet, perhaps behind execution of step b25, all allow the benchmark parameter of numbering equal the current numbering that from the TRAP packet, extracts;
B27. among the step b24,, or behind execution of step b21, b26, finish checking treatment when the current numbering that from the TRAP packet, extracts during less than the benchmark parameter of numbering;
B28. network management system is checked the numbering in the described verification buffering area, sends the TRAP packet corresponding with numbering to the end request of the source of transmission.
The initialization benchmark parameter of numbering is set to zero when network management system starts.
The correspondence of respectively numbering that also is included as in the described verification buffering area is provided with timer; Among the step b21, during numbering in deletion verification buffering area, deletion is simultaneously numbered corresponding timer with this; In step b25, start when the numbering that will lack writes the verification buffering area and number corresponding timer with these; In step b28, described network management system is to check timer corresponding with each numbering in the verification buffering area by the time cycle of presetting, when timer surpasses the fixed time, send the TRAP packet corresponding to the end request of the source of transmission with numbering, simultaneously with this timer zero clearing, when the timer corresponding with numbering do not surpass the fixed time, only timer is done to add 1 operation.
Described continuity numbering is a serial number, and numbering starts anew when the source of transmission end restarts at every turn.
Described serial number is represented with unsigned long, with step-length 1 serial number.
Described numbering is inserted in the custom variable binding field of TRAP packet and transmits.
Method of the present invention is to judge the technical scheme whether SNMPTRAP loses by the continuity that is inserted in the numbering in the TRAP packets fields; The notion of this numbering is a serial number; Network management system can judge the TRAP packet of losing, and the TRAP packet that requires transmission source end just to lose is retransmitted by handling the continuity of this serial number.
Technology of the present invention designs in order to solve the packet loss phenomenon of SNMP TRAP packet in transport process, its basic design scheme is to insert the serial number that abbreviates serial number as when sending SNMP TRAP, after receiving terminal receives SNMP TRAP packet, judge whether serial number is continuous, if it is discontinuous, the TRAP packet that then shows the serial number representative that lacks is lost in transport process, needs transmission source end (Agent) to resend this TRAP.
SNMP TRAP packet adopts udp protocol to transmit, but this agreement itself is check and retransmission mechanism not, method of the present invention has remedied this defective, realized the verification scheme of SNMP TRAP, can guarantee in time to find SNMP TRAP packet in transport process the packet loss phenomenon and require transmission source end to retransmit, thereby guaranteed the consistency of TRAP data between webmaster and the equipment.
Method of the present invention changed traditional only at protocol layer to sending the method that message adds sequence number, but in application layer to sending the serial number that message adds serial number, message is sent with receiving still can use udp protocol, and obtain to transmit reliability and guarantee.
Description of drawings
Fig. 1 is when sending SNMP TRAP, adds the schematic diagram of serial number in the VB field;
Fig. 2 is that the present invention judges the FB(flow block) whether SNMP TRAP packet is lost.
Embodiment
Numbering involved in the present invention is a serial number, is the exclusive number that transmission source end equipment (Agent) is done each Trap packet of order transmission.Transmission source end equipment (Agent) restarts the back from 1 open numbering in network management system at every turn, and serial number uses a unsigned long to represent, with step-length 1 serial number, and for example 1,2,3,4.....The receiving device of network management system relies on the continuity of serial number to judge whether to receive all TRAP packets after receiving SNMP TRAP packet, and requires transmission source end to retransmit to the part of discontinuous numbering.
Referring to Fig. 1, transmission source end (Agent) is when sending each SNMP TRAP packet, in variable binding field (VB:Variable Binding), add serial number, as among the figure serial number being placed on first VB field, this variable binding field is custom field (some content is to be set by agreement in the TRAP data message, and VB wherein then can be by User Defined).Comprise serial number, value (Value) and since 2 to n object (Object) and value.
Network management system is taken out serial number from the VB field after receiving the TRAP packet, and judge according to the continuity of serial number that the TRAP data are not surrounded by and lose, and request transmission source end is retransmitted the TRAP packet of losing.During enforcement, whole process can use two threads to finish.
Shown in Figure 2 is the handling process of thread 1.
Step 201, the parameter of initialization TRAP verification when network management system starts, the benchmark parameter of serial number is set to 0, and (serial number benchmark parameter herein is a variable, because in the present invention program, as long as the serial number of the TRAP of the up-to-date reception of system is greater than this serial number benchmark, the serial number assignment of the new TRAP that just will receive is given the serial number benchmark, so the serial number benchmark maximum serial number of the TRAP that receives of system always);
Step 202,203, network management system is decoded to the SNMP TRAP that receives from Agent, and obtains its serial number from Virable Binding (being called for short VB);
Step 204, check the verification buffering area, judge whether exist the serial number that equates with the serial number of the current TRAP packet that receives in the verification buffering area (in technical scheme of the present invention, the verification buffering area is set is used to write down discontinuous serial number, promptly when finding that serial number has discontinuous situation, just discontinuous this part serial number is write in the verification buffering area.Therefore the verification buffering area is a formation, if reported by the TRAP of verification, then corresponding with it serial number is deleted from the verification buffering area, otherwise these serial numbers is kept in the verification buffering area always);
Step 205, if have the serial number that number equates with the current TRAP packet flowing water that receives in the verification buffering area, illustrate that the TRAP that receives is the content that reports again by verification, then delete this serial number and corresponding timer thereof in the verification buffering area, deletion has just no longer carried out verification (serial number herein equates it is to show that the TRAP that newly receives is the TRAP that reports again by verification) to this TRAP later;
Step 206 is if the serial number that number does not equate with the current TRAP packet flowing water that receives in the verification buffering area of judging in the step 204 then further judges whether the benchmark parameter of present serial number is 0;
Step 207, if the serial number benchmark parameter in the verification buffering area of judging in the step 206 is 0, show it is the first frame SNMP TRAP packet that receives after network management system starts, because first frame data do not have the notion of " continuously ", also can't carry out verification by method of the present invention, thereby do not do verification, but with the serial number of this TRAP packet benchmark, promptly allow serial number benchmark parameter=current TRAP packet flowing water that receives number as follow-up comparison;
Step 208, if the serial number benchmark parameter of judging in the step 206 is not 0, judge further then whether serial number benchmark parameter+1 equals the serial number of the current TRAP packet that receives, if equate, the serial number that the TRAP packet that receives is described is continuous, the TRAP packet is not lost, and need not to carry out verification, continues execution in step 207;
Step 209, be not equal to the current TRAP packet flowing water that receives number if judge benchmark parameter+1 of serial number in the step 208, judge further that then whether the TRAP serial number that receives is less than serial number benchmark parameter, if the TRAP serial number that receives is less than serial number benchmark parameter, illustrate that the TRAP packet that receives is the content that reports again by verification, the content that once reported promptly, belong to the TRAP that repeats to report, be normal, need not verification, execution in step 211 is directly carried out follow-up other processing;
Step 210, if the serial number of judging the TRAP packet that receives in the step 209 is greater than serial number benchmark parameter, then the serial number that lacks between serial number benchmark parameter and the current TRAP packet flowing water number is write the verification buffering area, and startup is at the timer of these serial numbers, execution in step 207 then, with the serial number of this TRAP of the receiving benchmark as follow-up comparison.
Step 211 after the execution of step 205,207 with in execution in step 209 time, when judging that the TRAP serial number that receives is less than serial number benchmark parameter, then can be carried out other follow-up operation, because of not belonging to technology contents of the present invention, so repeat no more.
The handling process of the embodiment of the invention second thread is:
Network management system periodically timing (as the per second inspection once) is checked the verification buffering area, for the serial number that surpasses the fixed time (this fixed time can be set in advance by the user according to the actual conditions of network), send the order that requires to resend the TRAP packet corresponding to sending source end (Agent) with this serial number, timer zero clearing that simultaneously will be corresponding with this serial number, and for there not being overtime serial number, then that it is corresponding timer is done+1 and is handled.As fixed time of being provided be 3 seconds, when the timer corresponding that writes down in the verification buffering area during, only this timer is done to add 1 operation less than 3 seconds with a serial number; When the timer corresponding with a serial number that writes down in the verification buffering area during more than or equal to 3 seconds, then in this proof cycle, end sends the TRAP packet that requires to resend this serial number to the source of transmission, and timer zero clearing that simultaneously will be corresponding with this serial number.Also promptly check the serial number that only writes down the TRAP packet of not receiving in the buffering area, the serial number that is the TRAP packet retransmitted of the needs lost (can not guarantee the sequencing that sends owing to send TRAP by udp protocol, therefore the TRAP that sends earlier of agent may after receive, whether lose time-delay of needs so judge TRAP, can not find to lose immediately and retransmit).
In embodiment illustrated in fig. 2, in sending source end request transmission and verification buffering area, do not numbering corresponding TRAP packet if require behind the certain hour, then can timer be set for numbering correspondence in the verification buffering area, in the above-mentioned steps 205, need not the corresponding timer of deletion in the deletion serial number, in the above-mentioned steps 210, when the serial number that will lack writes in the verification buffering area, also needn't start timer.Correspondingly, when network management system was checked the verification buffering area, finding had numbering in the verification buffering area, then sent the order that requires to resend the TRAP packet corresponding with this serial number to sending source end (Agent).
Method of the present invention adopts udp protocol to transmit at SNMP TRAP, and udp protocol itself does not have verification and retransmission mechanism, therefore TRAP packet loss phenomenon can appear, also promptly can not guarantee SNMP TRAP reliability problems and design, can be applied to use in the equipment and network management device that snmp protocol communicates, to guarantee the reliable transmission of SNMP TRAP data message.
The agreement itself that method of the present invention also can be used for other does not have in the packet transmission of check and retransmission mechanism, to guarantee reliable transmission.
Claims (6)
1. the method for ensuring reliability that packet transmits in the Simple Network Management Protocol is characterized in that comprising:
A. send the source end and carry out serial number for each TRAP packet by sending order, this numbering sends with the TRAP packet;
B. receiving terminal is judged the numbering continuity that receives the TRAP packet, when the numbering of TRAP packet is discontinuous, requires transmission source end to retransmit the TRAP packet that numbering lacks, and specifically comprises:
B1. from the TRAP packet that receives, extract numbering;
B2. the numbering in numbering that will extract and the verification buffering area compares, and handles according to comparative result, comprises;
B21. when the numbering that extracts when numbering in the verification buffering area equates, do in the deletion verification buffering area should numbering operation;
B22. when the numbering in numbering that extracts and the verification buffering area is unequal, judge further whether the benchmark parameter of numbering is the initialization value of setting;
B23. when the benchmark parameter of numbering during not for the initialization value of setting, further the judgement benchmark parameter of numbering adds 1 whether equal the current numbering that extracts from the TRAP packet;
B24. add 1 when being not equal to the current numbering that from the TRAP packet, extracts when the benchmark parameter of numbering, judge that further the current numbering that extracts is whether less than the benchmark parameter of numbering from the TRAP packet;
B25. when the current numbering that from the TRAP packet, extracts during, the numbering that lacks between the benchmark parameter of numbering and the current numbering that extracts from the TRAP packet is write in the described verification buffering area greater than the benchmark parameter of numbering;
B26. among step b22, the b23, when the benchmark parameter of numbering is the initialization value of setting, perhaps Bian Hao benchmark parameter is not for the initialization value of setting but the benchmark parameter of numbering adds 1 when equaling the current numbering that extracts from the TRAP packet, perhaps behind execution of step b25, all allow the benchmark parameter of numbering equal the current numbering that from the TRAP packet, extracts;
B27. among the step b24,, or behind execution of step b21, b26, finish checking treatment when the current numbering that from the TRAP packet, extracts during less than the benchmark parameter of numbering;
B28. network management system is checked the numbering in the described verification buffering area, sends the TRAP packet corresponding with numbering to the end request of the source of transmission.
2. the method for ensuring reliability that packet transmits in a kind of Simple Network Management Protocol according to claim 1 is characterized in that:
The initialization benchmark parameter of numbering is set to zero when network management system starts.
3. the method for ensuring reliability that packet transmits in a kind of Simple Network Management Protocol according to claim 1 and 2, it is characterized in that: the correspondence of respectively numbering that also is included as in the described verification buffering area is provided with timer; Among the step b21, during numbering in deletion verification buffering area, deletion is simultaneously numbered corresponding timer with this; In step b25, start when the numbering that will lack writes the verification buffering area and number corresponding timer with these; In step b28, described network management system is to check timer corresponding with each numbering in the verification buffering area by the time cycle of presetting, when timer surpasses the fixed time, send the TRAP packet corresponding to the end request of the source of transmission with numbering, simultaneously with this timer zero clearing, when the timer corresponding with numbering do not surpass the fixed time, only timer is done to add 1 operation.
4. the method for ensuring reliability that packet transmits in a kind of Simple Network Management Protocol according to claim 1 is characterized in that: described continuity numbering is a serial number, and numbering starts anew when the source of transmission end restarts at every turn.
5. the method for ensuring reliability that packet transmits in a kind of Simple Network Management Protocol according to claim 4, it is characterized in that: described serial number is represented with unsigned long, with step-length 1 serial number.
6. the method for ensuring reliability that packet transmits in a kind of Simple Network Management Protocol according to claim 1 is characterized in that: described numbering is inserted in the custom variable binding field of TRAP packet and transmits.
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| CNB021494398A CN100334867C (en) | 2002-11-20 | 2002-11-20 | Method for assuring reliability of data package transmission in simple network management protocol |
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| CNB021494398A CN100334867C (en) | 2002-11-20 | 2002-11-20 | Method for assuring reliability of data package transmission in simple network management protocol |
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| CN2007101474471A Division CN101127715B (en) | 2002-11-20 | 2002-11-20 | Reliability guarantee method for data packet transmission in SNMP |
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| CN100334867C true CN100334867C (en) | 2007-08-29 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100336343C (en) * | 2004-10-10 | 2007-09-05 | 中兴通讯股份有限公司 | Method for keeping multiple data copy consistency in distributed system |
| CN100399841C (en) * | 2004-12-20 | 2008-07-02 | 腾讯科技（深圳）有限公司 | Retransmission method of signaling message in use for communication in pressing and speaking mode |
| JP4711921B2 (en) * | 2006-05-22 | 2011-06-29 | パナソニック株式会社 | Communication terminal apparatus and retransmission request method |
| CN101511042B (en) * | 2009-03-23 | 2012-05-16 | 中兴通讯股份有限公司 | Data synchronization method and device |
| CN102014004A (en) * | 2010-12-16 | 2011-04-13 | 中国电子科技集团公司第三十研究所 | Method for managing network elements by network management system |
| CN102546081B (en) * | 2010-12-21 | 2015-09-16 | 中兴通讯股份有限公司 | Method for detecting packet loss, system and media client |
| CN102970104B (en) * | 2012-10-24 | 2016-01-27 | 北京经纬恒润科技有限公司 | A kind of method and server obtaining data |
| CN103647667B (en) * | 2013-12-13 | 2017-01-25 | 华为技术有限公司 | Self-trapping Trap message processing method, management end and self-trapping Trap message processing system |
| CN107979449B (en) * | 2016-10-25 | 2020-11-20 | 杭州海康威视数字技术股份有限公司 | Data transmission method and device |
| CN113419885B (en) * | 2021-06-18 | 2023-05-26 | 杭州海康威视数字技术股份有限公司 | Data integrity processing method and device and electronic equipment |
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| JP2002064878A (en) * | 2000-06-05 | 2002-02-28 | Mitsubishi Electric Corp | Radio communication system, radio base station, radio terminal, and radio multicast communication controlling method |
| CN1350358A (en) * | 2000-10-24 | 2002-05-22 | 东芝株式会社 | Electric motor rotor and method for manufacturing the same |
| JP2002271442A (en) * | 2001-03-07 | 2002-09-20 | Matsushita Electric Ind Co Ltd | Rlc communication device and rlc communication type judging processing method |
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- 2002-11-20 CN CNB021494398A patent/CN100334867C/en not_active Expired - Lifetime
Patent Citations (5)
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| CN1153583A (en) * | 1995-05-09 | 1997-07-02 | 诺基亚电信公司 | Data transmission system with sliding-window data flow control |
| CN1175144A (en) * | 1996-06-27 | 1998-03-04 | 大宇电子株式会社 | Method of detecting lost or incorrect inserted packed based on sequence number |
| JP2002064878A (en) * | 2000-06-05 | 2002-02-28 | Mitsubishi Electric Corp | Radio communication system, radio base station, radio terminal, and radio multicast communication controlling method |
| CN1350358A (en) * | 2000-10-24 | 2002-05-22 | 东芝株式会社 | Electric motor rotor and method for manufacturing the same |
| JP2002271442A (en) * | 2001-03-07 | 2002-09-20 | Matsushita Electric Ind Co Ltd | Rlc communication device and rlc communication type judging processing method |
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