CN102263651A - Method for detecting connection state of local end equipment in SNMP (simple network management protocol) network management system (NMS) - Google Patents
Method for detecting connection state of local end equipment in SNMP (simple network management protocol) network management system (NMS) Download PDFInfo
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Abstract
The invention discloses a method for detecting a connection state of local end equipment in an SNMP (simple network management protocol) network management system (NMS). Running states of the local end equipment are set as four station, namely a non-connection state, a normal connection state, an abnormal connection state and an interruption state; the NMS sends heartbeat packets to the managed local end equipment asynchronously and regularly; and the four connection states of the local end equipment are set in accordance with heartbeat response responded by the local end equipment. In the method, the connection states of the local end equipment are acquired by virtue of the heartbeat packets and heartbeat response packets; the judgment of the connection states of concurrent processing equipment is supported; the judgment on states among equipment is not influenced mutually; the error judgment for the running states of the equipment can be avoided under the condition of bad network state; the actual running states of the equipment can be reflected more actually; the time intervals for sending the heartbeat data packets are balanced; and the overhead of frequently polling and increasing equipment and networks is avoided.
Description
Technical field
The present invention relates to network system, be specifically related to local side apparatus connection state detection method in the SNMP network management system based on SNMP.
Background technology
Network technology is maked rapid progress at present, the userbase of broadband access network constantly enlarges, the complexity of network is also in continuous growth, and the workload of operations such as the runnability of the normal operation of guarantee connection network of network object (router, switch, circuit etc.), monitoring network, optimization topology of networks, maintenance and management is also in continuous growth.Network management system also so more and more independent becomes increasingly complex, and function is also more and more complete, and network management also develops into an important branch in the computer network, and progressively become standardization, institutionalization.At present, (Simple Network Management Protocol SNMP) has become actual industrial standard in the field of network management to Simple Network Management Protocol, and is extensively supported and use, and most of network management system and platform all are based on SNMP's.
Simple Network Management Protocol (SNMP) is a kind of NMP based on TCP/IP, and it uses UDP as transport layer protocol, can manage the network local side apparatus of supporting agent process.SNMP mainly comprises SMI (structure of management information), MIB (management information bank) and several parts of snmp protocol.Fig. 1 illustrates the SNMP architectural model.SMI has provided the general framework of management object definition, and MIB is the structure set of whole managed objects of safeguarding of local side apparatus, and snmp protocol comprises the form of SNMP operation, SNMP information and how to exchange messages in application program and local side equipment room.
SNMP adopts agency/NMS model to carry out network management, and four key components are arranged: management work station (NMS is called for short NMS in the back), administration agent (Agent), management information bank (MIB) and snmp protocol.Administration agent is made response to information inquiry and action execution request from NMS, can also send important accident to NMS asynchronously simultaneously, be connected by the SNMP NMP between NMS and the administration agent and realize communication, it comprises following main operation: be respectively Get-Request, Get-Response, Get-Next-Request, Set-Request and Trap.Intercom mutually by these several message packets between agency and the NMS, obtaining the various information of network local side apparatus, thus the normal operation of Control Network local side apparatus.
Yet, communication between local side apparatus and the NMS must be based upon on the basis that NMS understands the local side apparatus connection status just can be carried out, that is to say, NMS must learn at first whether local side apparatus is connected normally with it and could send various communication informations, at present conventional way all is that NMS sends heartbeat packet, and normal according to whether receiving that local side apparatus knows to the answer of this heartbeat packet whether local side apparatus is connected with it.But, because the complex characteristics of network, under many circumstances, NMS does not receive that the answer of this heartbeat packet goes out not represent itself and local side apparatus to interrupt, have little time to reply because possible local side apparatus is just busy, perhaps network congestion causes delay, also may be the UDP packet loss, under these situations, the connecting path of NMS and local side apparatus is normal, and existing processing method all is considered as it interrupting, thereby has produced more erroneous judgement, thereby brings certain trouble for the management of network local side apparatus.
Summary of the invention
Technical problem to be solved by this invention is to solve based on the network management system shortage of SNMP network local side apparatus connection status is effectively judged, thereby brings the problem of certain trouble to the management of network local side apparatus.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention provides local side apparatus connection state detection method in a kind of SNMP network management system, may further comprise the steps:
A10, NMS be all local side device initializes, the incoming end equipment connection status of going forward side by side testing process;
A20, NMS judge whether to occur withdrawing from the local side apparatus connection status and detect event notice, if receive then withdraw from, otherwise change steps A 30;
A30, NMS serve as at interval respectively to by all local side apparatus asynchronous transmission heartbeat packet of its management with the heartbeat detection time, and according to whether receiving that heartbeat respond packet that each local side apparatus is replied is provided with the connection status of this local side apparatus:
A301, when NMS receives the heartbeat respond packet that certain local side apparatus replys, then the connection status of this local side apparatus is set to connect normal, and no longer sends heartbeat packet to it in this heartbeat detection in the time period, changes steps A 20 afterwards;
A302, when NMS does not receive the heartbeat respond packet that certain local side apparatus replys, then the connection status of this local side apparatus is set to connect unusual;
When the connection status of certain local side apparatus is unusual for connecting, NMS constantly repeats to send heartbeat packet to this local side apparatus, and whether receives in the time period that with 2 heartbeat detection the heartbeat respond packet that this local side apparatus is replied serves as according to the connection status of knowing this local side apparatus;
If receive the heartbeat respond packet that this local side apparatus is replied in the time period 2 heartbeat detection, then the connection status of this local side apparatus is set to connect normal and no longer sends heartbeat packet to it in this heartbeat detection in the time period, changes steps A 20 afterwards; Otherwise the connection status of this local side apparatus is set to interrupt, and changes steps A 20;
A40, according to the connection status of local side apparatus, the connection status parameter of local side apparatus is set.
In said method, the entry condition of local side apparatus connection status testing process is, local side apparatus is in not-connected status and receives for the first time and detect instruction, and perhaps local side apparatus is in and connects normal condition and arrive the heartbeat detection time, and the described heartbeat detection time is 30s.
In the said method, the connection status of all local side apparatus is set to not connect during the NMS initialization, will send the time of heartbeat packet, time and the connect hours that reported interruption last time last time all to be set to 0.
In the said method, NMS is set to connect the normal while in the connection status of each local side apparatus, refreshes at time that reports the time that sent heartbeat packet the last time of this local side apparatus, last time interruption and connect hours.
In the said method, steps A 40 may further comprise the steps:
A401, NMS extract a local side apparatus successively and obtain the connection status of this local side apparatus and the time that sent heartbeat packet last time from the local side apparatus formation;
If the connection status of this local side apparatus of A402 is not connect, whether the time that sent heartbeat packet last time of then judging this local side apparatus is 0, if be 0 then to the request of this local side apparatus asynchronous transmission SNMP heartbeat packet, and the time that will send heartbeat packet last time be made as the current time, go to steps A 20 afterwards; Otherwise directly go to steps A 20;
If the connection status of local side apparatus is to connect normally, then judge heartbeat packet transmitting time and the time interval of current time last time, if should be interval greater than equaling heart time, then to the request of this local side apparatus asynchronous transmission SNMP heartbeat packet, and the time that will send heartbeat packet last time be made as the current time, go to steps A 20 afterwards; Otherwise directly go to steps A 20;
If the connection status of local side apparatus is to connect unusually, then judge to send current time and last time the time interval of heartbeat packet time, if should then report the local side apparatus interrupt event to NMS, go to steps A 20 afterwards interval greater than equaling break period; Otherwise directly go to steps A 20;
If the connection status of local side apparatus is to connect to interrupt, then judge to report current time and last time the time interval of break period, if should then report the local side apparatus interrupt event, go to steps A 20 afterwards interval greater than interrupting reporting the time interval; Otherwise directly go to steps A 20.
In the said method, the handling process of heartbeat respond packet may further comprise the steps:
B10, NMS according to whether receiving that heartbeat respond packet that this local side apparatus returns obtains it and whether responds successful judged result, change step B20 if response is unsuccessful otherwise change step B40 after certain local side apparatus sends the request of SNMP heartbeat packet;
B20, the request of continuation asynchronous transmission SNMP heartbeat packet;
B30, judge whether system's current state is interruption, if interrupt status then withdraws from; Otherwise the connection status of this local side apparatus is changed to connects unusual and withdraw from;
B40, judge whether system's current state is interruption, if interrupt status is then put into the internal focal point formation with this local side apparatus, so that upgrade warning information in time; Whether otherwise the state that then connects is changed to and connects normally, and the current time that will be changed to the connect hours, arrive so that detect eartbeat interval.
In the said method, the NMS 100ms that pauses after device queue has traveled through a time to local side, and in this intermittence time, judge whether to occur reporting interrupt condition, this reports interrupt condition is that local side apparatus is in and connects unusual and never receive the heartbeat respond packet in lasting break period, and perhaps local side apparatus is in interrupt status and duration of interruption and reaches and interrupt reporting the time interval.
The present invention, obtain the connection status of local side apparatus by heartbeat packet and heartbeat respond packet, support the judgement of the connection status of concurrent processing large number quipments, the judgement of equipment room state does not influence each other, avoid under the bad situation of network state, equipment running status being judged by accident, actual motion state that can more real consersion unit has been done a balance to the time interval that sends heartbeat data packets simultaneously, avoids frequent poll to increase the expense of equipment and network.
Description of drawings
Fig. 1 is the SNMP architectural model;
Fig. 2 is the local side apparatus state change map;
Fig. 3 is a local side apparatus connection state detection method flow chart in the SNMP network management system of the present invention;
Fig. 4 is a heartbeat respond packet process chart.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with accompanying drawing.
Fig. 1 shows management work station in the SNMP system (NMS is called for short NMS in the back), by the relation between managed network element (which is provided with administration agent Agent) and the snmp protocol.This system is the known technology of this area, does not repeat them here.
Fig. 2 shows the variation diagram of NMS to four kinds of connection status of local side apparatus settings, and these four kinds of states are respectively: do not connect, connect normally, interrupt, connect unusually, wherein:
Do not connect the initialized connection status of expression local side apparatus, connection status to be updated such as indication equipment;
On connecting normal expression NMS and local side apparatus being connected, connect normal condition and can only become the connection abnormality or remain unchanged;
Interrupt expression NMS and can not connect local side apparatus, connect interrupt status and can only become and connect normally or remain unchanged;
Connecting unusual expression NMS has not connected with local side apparatus, because may be false interrupt status this moment, the affirmation of need waiting for a period of time, if this local side apparatus all is an interrupt status in continuous a period of time, then connect abnormality and be updated to interrupt status, if this local side apparatus recovers normal in continuous a period of time, it is normal for connecting then to connect improper update.
In the present invention, the SNMP network management system is being provided with the SNMP agency on the local side apparatus of managing, the snmp management station is set on the webmaster computer, the running status of local side apparatus is set to not connect, connect normal, connect unusual and four kinds of states of interruption, the local side apparatus asynchronous transmission heartbeat packet that the snmp management phase of standing firm manages to quilt, local side apparatus is acted on behalf of the snmp management station that replies on the webmaster computer to the heartbeat respond packet through the SNMP agency, the relevant parameter of heartbeat respond packet comprises that the power-on time of this local side apparatus and some tag fields are (as the alarm data mark, the capacity of equipment mark) etc., the webmaster computer obtains above-mentioned four kinds of connection status of this local side apparatus according to the heartbeat respond packet.
Fig. 3 shows the local side apparatus connection state detection method, and NMS manages all local side apparatus of its subordinate by a local side apparatus formation, and concrete steps are as follows:
A10, NMS be all local side device initializes, the incoming end equipment connection status of going forward side by side testing process.
When initialization, NMS is set to the connection status of each local side apparatus do not connect, will send last time heartbeat packet time (last_send_time), reported last time the time (last_break_time) of interruption and connect hours (last_conntected_time) all to be set to 0.
The entry condition of local side apparatus connection status testing process is, local side apparatus is in not-connected status and receives for the first time and detect instruction, and perhaps local side apparatus is in and connects normal condition and arrive the heartbeat detection time, and the described heartbeat detection time is 30s.
A20, NMS judge whether to occur withdrawing from the local side apparatus connection status and detect event notice, if receive then withdraw from otherwise change steps A 30;
A30, NMS is the interval with the heartbeat detection time, according to the local side apparatus formation successively to by all local side apparatus asynchronous transmission heartbeat packet of its management, and transmitting time last_send_time is changed to the current time, so that declare the detection of interruption, follow-up detection to this local side apparatus is driven by call back function, whether basis received that the heartbeat respond packet of each local side apparatus answer is provided with the connection status of this local side apparatus after NMS sent heartbeat packet, the described heartbeat detection time is 30s, this at interval both can very fast discovering device abnormality, can avoid frequent request to cause the increase of cost of device again.
A301, when NMS receives the heartbeat respond packet that certain local side apparatus replys, then the connection status of this local side apparatus is set to connect normal, and no longer sends heartbeat packet to it in this heartbeat detection in the time period, changes steps A 20 afterwards;
NMS is set to connect the normal while in the connection status of each local side apparatus, refreshes at time that reports the time that sent heartbeat packet the last time of this local side apparatus, last time interruption and connect hours.
A302, when NMS does not receive the heartbeat respond packet that certain local side apparatus replys, then the connection status of this local side apparatus is set to connect unusual;
When the connection status of certain local side apparatus is unusual for connecting, NMS constantly repeats to send heartbeat packet to this local side apparatus, and whether receives in the time period that with 2 heartbeat detection the heartbeat respond packet that this local side apparatus is replied serves as according to the connection status of knowing this local side apparatus;
If receive the heartbeat respond packet that this local side apparatus is replied in the time period 2 heartbeat detection, then the connection status of this local side apparatus is set to connect normal and no longer sends heartbeat packet to it in this heartbeat detection in the time period, changes steps A 20 afterwards; Otherwise, have no progeny during the connection status of this local side apparatus is set to and change steps A 20;
A40, according to the connection status of local side apparatus, the connection status parameter of local side apparatus is set.
Steps A 40 may further comprise the steps:
A401, NMS extract a local side apparatus successively and obtain the connection status of this local side apparatus and the time that sent heartbeat packet last time from the local side apparatus formation;
If the connection status of this local side apparatus of A402 is not connect, whether the time that sent heartbeat packet last time of then judging this local side apparatus is 0, if be 0 then to the request of this local side apparatus asynchronous transmission SNMP heartbeat packet, and the time that will send heartbeat packet last time is made as the current time, be last_send_time=now, go to steps A 20 afterwards; Otherwise directly go to steps A 20;
If the connection status of local side apparatus is to connect normally, then judge heartbeat packet transmitting time and the time interval of current time last time, if should be interval greater than equaling heart time, then to the request of this local side apparatus asynchronous transmission SNMP heartbeat packet, and the time that will send heartbeat packet last time is made as the current time, be last_send_time=now, go to steps A 20 afterwards; Otherwise directly go to steps A 20;
If the connection status of local side apparatus is to connect unusually, then judge to send current time and last time the time interval of heartbeat packet time, if should then report the local side apparatus interrupt event to NMS interval greater than equaling break period, be last_break_time=now, go to steps A 20 afterwards; Otherwise directly go to steps A 20;
If the connection status of local side apparatus is to connect to interrupt, then judge to report current time and last time the time interval of break period, if should then report the local side apparatus interrupt event, go to steps A 20 afterwards interval greater than interrupting reporting the time interval; Otherwise directly go to steps A 20.
Fig. 4 shows the handling process of heartbeat respond packet, may further comprise the steps.
B10, NMS according to whether receiving that heartbeat respond packet that this local side apparatus returns obtains it and whether responds successful judged result, change step B20 if response is unsuccessful otherwise change step B40 after certain local side apparatus sends the request of SNMP heartbeat packet;
B20, the request of continuation asynchronous transmission SNMP heartbeat packet;
B30, judge whether system's current state is interruption, if interrupt status then withdraws from; Otherwise the connection status of this local side apparatus is changed to connects unusual and withdraw from;
B40, judge whether system's current state is interruption, if interrupt status is then put into the internal focal point formation with this local side apparatus, so that upgrade warning information in time; When certain equipment became internal focal point, NMS can give more sustained attention the alarm of this equipment and the variation of status lamp in a certain period, and the organizational form of these internal focal point in webmaster is a formation, so the formation of called after internal focal point; Otherwise with the connection status of this local side apparatus be changed to connect normal, and the connect hours be set to the current time, i.e. last_connected_time=now.
The 100ms that pauses after device queue has traveled through one time to local side, in order to avoid this flow process takies CPU always, the influence of disconnected response time of this time centering is very little.Judge the intermittence of traversal local side apparatus and report interrupt condition, this reports interrupt condition is that local side apparatus is in and connects unusual and never receive the heartbeat respond packet in lasting break period, and perhaps local side apparatus is in interrupt status and duration of interruption and reaches and interrupt reporting the time interval.
The above is preferred embodiment of the present invention only, is not limited to the present invention, all any modifications of being made within the present invention spirit and principle, is equal to replacement and improvement etc., all is contained within protection scope of the present invention.
Claims (7)
1.SNMP local side apparatus connection state detection method in the network management system is characterized in that may further comprise the steps:
A10, NMS be all local side device initializes, the incoming end equipment connection status of going forward side by side testing process;
A20, NMS judge whether to occur withdrawing from the local side apparatus connection status and detect event notice, if receive then withdraw from, otherwise change steps A 30;
A30, NMS serve as at interval respectively to by all local side apparatus asynchronous transmission heartbeat packet of its management with the heartbeat detection time, and according to whether receiving that heartbeat respond packet that each local side apparatus is replied is provided with the connection status of this local side apparatus:
A301, when NMS receives the heartbeat respond packet that certain local side apparatus replys, then the connection status of this local side apparatus is set to connect normal, and no longer sends heartbeat packet to it in this heartbeat detection in the time period, changes steps A 20 afterwards;
A302, when NMS does not receive the heartbeat respond packet that certain local side apparatus replys, then the connection status of this local side apparatus is set to connect unusual;
When the connection status of certain local side apparatus is unusual for connecting, NMS constantly repeats to send heartbeat packet to this local side apparatus, and whether receives in the time period that with 2 heartbeat detection the heartbeat respond packet that this local side apparatus is replied serves as according to the connection status of knowing this local side apparatus;
If receive the heartbeat respond packet that this local side apparatus is replied in the time period 2 heartbeat detection, then the connection status of this local side apparatus is set to connect normal and no longer sends heartbeat packet to it in this heartbeat detection in the time period, changes steps A 20 afterwards; Otherwise the connection status of this local side apparatus is set to interrupt, and changes steps A 20;
A40, according to the connection status of local side apparatus, the connection status parameter of local side apparatus is set.
2. local side apparatus connection state detection method in the SNMP network management system as claimed in claim 1, it is characterized in that, the entry condition of local side apparatus connection status testing process is, local side apparatus is in not-connected status and receives for the first time and detect instruction, perhaps local side apparatus is in and connects normal condition and arrive the heartbeat detection time, and the described heartbeat detection time is 30s.
3. local side apparatus connection state detection method in the SNMP network management system as claimed in claim 1, the connection status of all local side apparatus is set to not connect when it is characterized in that the NMS initialization, will send the time of heartbeat packet, time and the connect hours that reported interruption last time last time all to be set to 0.
4. local side apparatus connection state detection method in the SNMP network management system as claimed in claim 3, it is characterized in that NMS is set to connect the normal while in the connection status of each local side apparatus, refreshes at time that reports the time that sent heartbeat packet the last time of this local side apparatus, last time interruption and connect hours.
5. local side apparatus connection state detection method in the SNMP network management system as claimed in claim 1 is characterized in that steps A 40 may further comprise the steps:
A401, NMS extract a local side apparatus successively and obtain the connection status of this local side apparatus and the time that sent heartbeat packet last time from the local side apparatus formation;
If the connection status of this local side apparatus of A402 is not connect, whether the time that sent heartbeat packet last time of then judging this local side apparatus is 0, if be 0 then to the request of this local side apparatus asynchronous transmission SNMP heartbeat packet, and the time that will send heartbeat packet last time be made as the current time, go to steps A 20 afterwards; Otherwise directly go to steps A 20;
If the connection status of local side apparatus is to connect normally, then judge heartbeat packet transmitting time and the time interval of current time last time, if should be interval greater than equaling heart time, then to the request of this local side apparatus asynchronous transmission SNMP heartbeat packet, and the time that will send heartbeat packet last time be made as the current time, go to steps A 20 afterwards; Otherwise directly go to steps A 20;
If the connection status of local side apparatus is to connect unusually, then judge to send current time and last time the time interval of heartbeat packet time, if should then report the local side apparatus interrupt event to NMS, go to steps A 20 afterwards interval greater than equaling break period; Otherwise directly go to steps A 20;
If the connection status of local side apparatus is to connect to interrupt, then judge to report current time and last time the time interval of break period, if should then report the local side apparatus interrupt event, go to steps A 20 afterwards interval greater than interrupting reporting the time interval; Otherwise directly go to steps A 20.
6. local side apparatus connection state detection method in the SNMP network management system as claimed in claim 1 is characterized in that the handling process of heartbeat respond packet may further comprise the steps:
B10, NMS according to whether receiving that heartbeat respond packet that this local side apparatus returns obtains it and whether responds successful judged result, change step B20 if response is unsuccessful otherwise change step B40 after certain local side apparatus sends the request of SNMP heartbeat packet;
B20, the request of continuation asynchronous transmission SNMP heartbeat packet;
B30, judge whether system's current state is interruption, if interrupt status then withdraws from; Otherwise the connection status of this local side apparatus is changed to connects unusual and withdraw from;
B40, judge whether system's current state is interruption, if interrupt status is then put into the internal focal point formation with this local side apparatus, so that upgrade warning information in time; Whether otherwise the state that then connects is changed to and connects normally, and the current time that will be changed to the connect hours, arrive so that detect eartbeat interval.
7. local side apparatus connection state detection method in the SNMP network management system as claimed in claim 1,100ms pauses after it is characterized in that NMS device queue having traveled through one time to local side, and in this intermittence time, judge whether to occur reporting interrupt condition, this reports interrupt condition is that local side apparatus is in and connects unusual and never receive the heartbeat respond packet in lasting break period, and perhaps local side apparatus is in interrupt status and duration of interruption and reaches and interrupt reporting the time interval.
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