CN101127715A - Reliability guarantee method for data packet transmission in SNMP - Google Patents

Reliability guarantee method for data packet transmission in SNMP Download PDF

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Publication number
CN101127715A
CN101127715A CNA2007101474471A CN200710147447A CN101127715A CN 101127715 A CN101127715 A CN 101127715A CN A2007101474471 A CNA2007101474471 A CN A2007101474471A CN 200710147447 A CN200710147447 A CN 200710147447A CN 101127715 A CN101127715 A CN 101127715A
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number information
trap
current
packet
trap packet
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CN101127715B (en
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贺培成
杜华坤
梅新华
吴蒙
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The utility model relates to a reliability assurance method and a device for transferring TRAP packets in simple network management protocol (SNMP), which can be used for realizing the checking mechanism of SNMP TRAP which can discover the loss of TRAP timely and request resending during transferring SNMP TRAP, comprising a sending source party and a receiving party. The sending source party sends TRAP packets to the receiving party. The TRAP packets contains the current serial number information obtained by numbering continuously according to sending sequence for each TRAP packet sending source party. The receiving party is used for dealing with the TRAP packets to get the current serial number information after receiving the TRAP packets. If the current serial number information is larger than the value by adding the former current serial number information of the TRAP packets and 1, the TRAP packet is defined to be lost during transferring. The lost TRAP packet is the packet corresponding with the missing serial number information between the current serial number information and the former serial number information.

Description

The method for ensuring reliability that packet transmits in the Simple Network Management Protocol
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, and this method comprises:
Transmission source end sends the TRAP packet to receiving terminal, include current number information in the described TRAP packet, and described current number information is that transmission source end gets for each TRAP packet carries out serial number by sending order;
Wherein, described receiving terminal is used for after receiving described TRAP packet, handle described this TRAP packet to obtain current number information, when the number information that comprises in greater than a last TRAP packet that receives when this current number information adds 1, determining has the TRAP data-bag lost in transport process, the described TRAP packet of losing is the TRAP packet of the number information representative that lacks between this current number information and the last number information.
Described transmission source end before receiving terminal sends, also comprises the TRAP packet: insert current number information in the custom variable binding VB of TRAP packet field.
The present invention also provides the method for ensuring reliability that packet transmits in a kind of Simple Network Management Protocol, and this method comprises:
The TRAP packet that A, reception transmission source end are sent;
B, the described TRAP packet of processing are with the current number information that obtains comprising in this TRAP packet;
C, when the number information that comprises in greater than a last TRAP packet that receives when this current number information adds 1, determining has the TRAP data-bag lost in transport process, the described TRAP packet of losing is the TRAP packet of the serial number information representative that lacks between this current number information and the last number information.
The described TRAP packet of described processing with the step of the current number information that obtains comprising in this TRAP packet is:
Described TRAP packet is decoded, and from the custom variable binding VB field of TRAP packet, extract current number information.
During system start-up, be zero, determine in transport process, to have the step of TRAP data-bag lost to be specially when the described number information that comprises in greater than a last TRAP packet that receives when this current number information adds 1 the benchmark parameter initialization of numbering:
D, when this current number information adds 1 greater than current benchmark parameter, determining has the TRAP data-bag lost in transport process;
Wherein, current benchmark parameter is the current number information that comprises in the last TRAP packet that receives.
Also comprise after the described step of determining in transport process, to have the TRAP data-bag lost: will this current number information and current benchmark parameter between the serial number information that lacks write the verification buffering area.
Also comprise after the described step B:
The current number information that obtains and the number information in the verification buffering area are compared,
When this current number information when a number information in the verification buffering area equates, do the operation of this number information in the deletion verification buffering area;
When the number information in this current number information and the verification buffering area is all unequal, judge further whether current benchmark parameter is zero;
When this current benchmark parameter is non-vanishing, change step D;
Described step D comprises:
Judge that current benchmark parameter adds 1 and whether equal the current current number information that obtains from the TRAP packet;
When current benchmark parameter adds 1 when being not equal to the current current number information that obtains from the TRAP packet, judge that further whether the current current number information that obtains is less than current benchmark parameter from the TRAP packet;
When the current current number information that obtains from the TRAP packet during greater than current benchmark parameter, determining has the TRAP data-bag lost in transport process.
Describedly also comprise determine that the TRAP data-bag lost is arranged in transport process after:
Check the number information in the described verification buffering area, to sending the source end request transmission TRAP packet corresponding with number information.
Also comprise:
During numbering in deletion verification buffering area, deletion is simultaneously numbered corresponding timer with this;
When the numbering that will lack writes the verification buffering area, start and number corresponding timer with these;
Check timer corresponding in the verification buffering area by the time cycle of presetting with each numbering, 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 number information 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.
The device that the present invention also provides a kind of reliability that is used for the transmission of Simple Network Management Protocol packet to guarantee is characterized in that this device comprises:
Be used to receive the unit of the TRAP packet that transmission source end sends;
Be used to handle described TRAP packet, with the unit of the current number information that obtains comprising in this TRAP packet;
Be used for when number information that this current number information comprises greater than a last TRAP packet that receives adds 1, determining in transport process, to have the unit of TRAP data-bag lost, wherein, the described TRAP packet of losing is the TRAP packet of the serial number information representative that lacks between this current number information and the last number information.
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, the place judges that whether TRAP loses time-delay of needs, 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 (14)

1. the method for ensuring reliability that packet transmits in the Simple Network Management Protocol is characterized in that this method comprises:
Transmission source end sends the TRAP packet to receiving terminal, include current number information in the described TRAP packet, and described current number information is that transmission source end gets for each TRAP packet carries out serial number by sending order;
Wherein, described receiving terminal is used for after receiving described TRAP packet, handle described this TRAP packet to obtain current number information, when the number information that comprises in greater than a last TRAP packet that receives when this current number information adds 1, determining has the TRAP data-bag lost in transport process, the described TRAP packet of losing is the TRAP packet of the number information representative that lacks between this current number information and the last number information.
2. method according to claim 1 is characterized in that, described transmission source end before receiving terminal sends, also comprises the TRAP packet: insert current number information in the custom variable binding VB of TRAP packet field.
3. the method for ensuring reliability that packet transmits in the Simple Network Management Protocol is characterized in that this method comprises:
The TRAP packet that A, reception transmission source end are sent;
B, the described TRAP packet of processing are with the current number information that obtains comprising in this TRAP packet;
C, when the number information that comprises in greater than a last TRAP packet that receives when this current number information adds 1, determining has the TRAP data-bag lost in transport process, the described TRAP packet of losing is the TRAP packet of the serial number information representative that lacks between this current number information and the last number information.
4. method according to claim 3 is characterized in that, the described TRAP packet of described processing with the step of the current number information that obtains comprising in this TRAP packet is:
Described TRAP packet is decoded, and from the VB field of TRAP packet, extract current number information.
5. method according to claim 3, it is characterized in that, during system start-up, with the benchmark parameter initialization of numbering is zero, when the described number information that comprises in greater than a last TRAP packet that receives when this current number information adds 1, determine in transport process, to have the step of TRAP data-bag lost to be specially:
D, when this current number information adds 1 greater than current benchmark parameter, determining has the TRAP data-bag lost in transport process;
Wherein, current benchmark parameter is the current number information that comprises in the last TRAP packet that receives.
6. method according to claim 5, it is characterized in that, also comprise after the described step of determining in transport process, to have the TRAP data-bag lost: will this current number information and current benchmark parameter between the serial number information that lacks write the verification buffering area.
7. method according to claim 6 is characterized in that, also comprises after the described step B:
The current number information that obtains and the number information in the verification buffering area are compared,
When this current number information when a number information in the verification buffering area equates, do the operation of this number information in the deletion verification buffering area;
When the number information in this current number information and the verification buffering area is all unequal, judge further whether current benchmark parameter is zero;
When this current benchmark parameter is non-vanishing, change step D
8. method according to claim 7 is characterized in that, described step D comprises:
Judge that current benchmark parameter adds 1 and whether equal the current current number information that obtains from the TRAP packet;
When current benchmark parameter adds 1 when being not equal to the current current number information that obtains from the TRAP packet, judge that further whether the current current number information that obtains is less than current benchmark parameter from the TRAP packet;
When the current current number information that obtains from the TRAP packet during greater than current benchmark parameter, determining has the TRAP data-bag lost in transport process.
9. method according to claim 8 is characterized in that, describedly also comprises determine that the TRAP data-bag lost is arranged in transport process after:
Check the number information in the described verification buffering area, to sending the source end request transmission TRAP packet corresponding with number information.
10. according to each described method of claim 3-9, it is characterized in that: also comprise:
During numbering in deletion verification buffering area, deletion is simultaneously numbered corresponding timer with this;
When the numbering that will lack writes the verification buffering area, start and number corresponding timer with these.
11. method according to claim 9 is characterized in that:
Check timer corresponding in the verification buffering area by the time cycle of presetting with each numbering, 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.
12. method according to claim 3 is characterized in that: described continuity number information is a serial number, and numbering starts anew when the source of transmission end restarts at every turn.
13. the method for ensuring reliability that packet transmits in a kind of Simple Network Management Protocol according to claim 12, it is characterized in that: described serial number is represented with unsigned long, with step-length 1 serial number.
14. a device that is used for the reliability assurance of Simple Network Management Protocol packet transmission is characterized in that this device comprises:
Be used to receive the unit of the TRAP packet that transmission source end sends;
Be used to handle described TRAP packet, with the unit of the current number information that obtains comprising in this TRAP packet;
Be used for when number information that this current number information comprises greater than a last TRAP packet that receives adds 1, determining in transport process, to have the unit of TRAP data-bag lost, wherein, the described TRAP packet of losing is the TRAP packet of the serial number information representative that lacks between this current number information and the last number information.
CN2007101474471A 2002-11-20 2002-11-20 Reliability guarantee method for data packet transmission in SNMP Expired - Lifetime CN101127715B (en)

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