CN104202196A - Method for detecting network performance problems and positioning failure nodes - Google Patents
Method for detecting network performance problems and positioning failure nodes Download PDFInfo
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Abstract
The invention discloses a method for detecting network performance problems and positioning failure nodes. The method includes the steps: establishing an IP (internet protocol) metropolitan area network topology structure comprising hierarchical relation among network nodes and corresponding relation of each network node and an IP address pool of a terminal that the network node belongs to; capturing IP data packets of all terminal access service platforms through a service platform outlet of an acquisition device on an IP metropolitan area network core layer; tracking TCP (transmission control protocol) data flow of each terminal, making statistics on TCP packet sum A and TCP duplicate packet number B of each terminal, computing TCP duplicate packet rate Nr=B/A, and then recording corresponding relation of an IP address of each terminal and the Nr; computing a current value Pc and a historical reference value Pb of a ratio of failure terminals that each network node belongs to; according to the metropolitan area network topology structure, traversing from top to bottom to detect whether or not the current failure problem terminal ratio Pc of each network node is out of limit, and if yes, prompting that the network node or the downstream node thereof has performance failure; finishing if network topology traversing is finished. By the method, the failure nodes with the ratio of the failure terminals out of limit can be found rapidly and accurately.
Description
Technical field
The invention belongs to network performance fault detection technique field, relate to a kind of method of locating network fault node, relate in particular to a kind of Sampling network performance issue and locate the method for malfunctioning node.
Background technology
Traditional network failure node detection method mainly comprises following three major types:
The first kind is to adopt the network management system based on snmp protocol to carry out administering and maintaining of network topology.This network management system generally can only detect more serious network failure (for example: Network Device Offline, port damage or link down), is but difficult to the performance issue (as serious in packet loss) existing in discovering network equipment or link.Along with the propelling of the integration of three networks, video class streaming media service is able to fast development, and these high bandwidth business are also more and more higher to the requirement of network performance, in the time that network node occurs that performance issue causes packet loss serious, will obviously affect the user experience quality (as occurred the phenomenons such as mosaic or card pause) of video traffic.Therefore, traditional network management system cannot meet guarantee and the maintenance needs to video service quality.
Equations of The Second Kind is packet loss test and the node of the network failure piecemeal arrange distinguish method based on Traceroute order adopting based on Ping order.Although the fairly simple convenience of this method, but be mainly applicable to the fault complaint handling of response type, be that attendant is only receiving after customer complaint, the equipment that could start targetedly in Internet resources and the introductory path of this user's access carries out malfunction elimination.The shortcoming of this method is cannot realize proactive network to safeguard, the performance issue initiatively existing in discovering network.
The 3rd class is to adopt the end-to-end monitoring system based on distributed probe to carry out quality of service guarantee and network failure node locating.In order to locate concrete network failure node location, this system often requires all to dispose probe at each intermediate node of network, carries out correlation comparison analysis by the network packet loss rate that each probe is monitored, and locates the concrete network node position of causing packet loss.The shortcoming of this method is that monitoring system lower deployment cost is too high, and the whole network covering that realize probe is almost impossible.
In view of this, nowadays in the urgent need to designing a kind of new malfunctioning node localization method, to overcome now methodical above-mentioned defect.
The main flow internet, applications that broadband user uses at present all adopts HTTP/TCP protocol stack.Because Transmission Control Protocol has error recovery mechanisms, in the time that IP network exists performance issue and produces packet loss, subscriber terminal equipment will retransmit lost packet by request server.
Fig. 1 be one because DSLAM equipment performance problem causes Network Packet Loss, and carried out the example of loss recovery by TCP retransmission mechanism.From this example, we can see at server layer and convergence-level and not occur any IP packet loss, but because appearring in the DSLAM equipment of Access Layer, performance issue causes 2 IP packet losses, thereby cause that TCP retransmits, and therefore can detect 2 TCP duplicate packages in monitoring points such as business platform outlet, core router, convergence switches.In Fig. 1, suppose that in Internet Transmission sequence number is 101 and 501 TCP packet loss, TCP retransmission mechanism has been realized loss recovery.
In certain hour section, if there is the TCP bag of two or more same sequence number and content in same TCP stream, the TCP bag occurring below can be TCP duplicate packages by statistics.TCP duplicate packages rate refers to the ratio of TCP duplicate packages number and all tcp data bag numbers.
It is below a typical IP metropolitan area network topological structure, business platform server generally can be deployed on the core router or BAS equipment of metropolitan area network, wideband subscriber terminal is by ICP/IP protocol, via broadband access network (DSLAM or OLT equipment), BAS equipment and core router access service platform.In the time that certain network node in the transmission path between terminal and business platform breaks down, tend to cause IP packet loss; Because the retransmission mechanism of TCP can recover packet loss, can increase by the TCP re-transmission of the terminal access business platform that malfunctioning node affects, also can obviously rise in the TCP duplicate packages rate of the influenced terminal of business platform outlet monitoring point statistics accordingly.
In fault case shown in Fig. 2, DSLAM-111 breaks down, cause its lower all can IP packet loss while hanging terminal access business platform and TCP retransmit situation about rising.The ratio of DSLAM-111 subordinate's problem terminal is 100%, and its subordinate's of upstream node institute problem terminal ratio is respectively DSLAM convergence switch-11 (33.3%) accordingly, BAS1 (20%).In addition, OLT-22 breaks down, and the ratio that causes its subordinate's problem terminal is 100%, and the subordinate's of its upstream node BAS2 institute problem terminal ratio is 33.3% accordingly.Integrating, is 12.5% in subordinate's problem terminal ratio of business platform and core router.
Summary of the invention
Technical problem to be solved by this invention is: a kind of Sampling network performance issue is provided and locates the method for malfunctioning node, can find out quickly and accurately the fault network node that causes terminal traffic Quality Down.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
Sampling network performance issue is also located the method for malfunctioning node, and described method comprises the steps:
Step S1, set up IP metropolitan area network topological structure, comprise hierarchical relationship between network node and each network node and the corresponding relation in IP address of terminal pond under it;
Step S2, the IP packet of all terminal access business platforms is caught in the business platform outlet of IP metropolitan area network core layer by collecting device;
Step S3, the tcp data of each terminal is flow to line trace, the TCP that adds up each terminal wraps total A and TCP duplicate packages is counted B, and calculates TCP duplicate packages rate Nr=B/A, then records the corresponding relation of each IP address of terminal with Nr;
TCP duplicate packages statistical rules: in certain hour section, if there is the TCP bag of two or more same sequence number in same TCP stream, the coated statistics of the TCP occurring is below TCP duplicate packages;
Step S4, calculate currency Pc and the historical fiducial value Pb of problem terminal accounting under each network node;
Described problem terminal refers to that its TCP duplicate packages rate Nr is greater than the terminal of setting threshold T r;
Total number of terminals in the problem number of terminals/current sampling period in the current sampling period of currency Pc=of problem terminal accounting;
Total number of terminals in problem number of terminals/all history samples cycles in all history samples cycles of historical fiducial value Pb=of problem terminal accounting;
Step S5, according to the topological structure of metropolitan area network, whether the current problem terminal accounting Pc that from top to down traversal detects each network node exceeds standard:
If Pc is >=Tp, judge that this network node exists performance fault, wherein Tp is the threshold value of problem terminal accounting under fault network node;
If Pc >=R*Pb and Pc < Tp, judge that the downstream node of this network node exists performance fault, wherein R is network performance deterioration factor;
If Pc < is R*Pb, judge this network node normal operation;
If step S6 network topology traversal finishes, finish.
As a preferred embodiment of the present invention, in step S4, the default value of Tr is 10%.
As a preferred embodiment of the present invention, in step S5, the default value of threshold T p is 50%.
As a preferred embodiment of the present invention, in step S5, the default value of network performance deterioration factor R is 1.5.
Sampling network performance issue is also located the method for malfunctioning node, and described method comprises the steps:
Step S1, set up IP metropolitan area network topological structure, comprise hierarchical relationship between network node and each network node and the corresponding relation in IP address of terminal pond under it;
Step S2, the IP packet of all terminal access business platforms is caught in the business platform outlet of IP metropolitan area network core layer by collecting device;
Step S3, the tcp data of each terminal is flow to line trace, the TCP that adds up each terminal wraps total A and TCP duplicate packages is counted B, and calculates TCP duplicate packages rate Nr=B/A, then records the corresponding relation of each IP address of terminal with Nr;
Step S4, calculate currency Pc and the historical fiducial value Pb of problem terminal accounting under each network node;
Step S5, according to the topological structure of metropolitan area network, whether the current problem terminal accounting Pc that from top to down traversal detects each network node exceeds standard;
If step S6 network topology traversal finishes, finish.
As a preferred embodiment of the present invention, in step S3, TCP duplicate packages statistical rules is: in certain hour section, if there is the TCP bag of two or more same sequence number in same TCP stream, the coated statistics of the TCP occurring is below TCP duplicate packages.
As a preferred embodiment of the present invention, in step S4, described problem terminal refers to that its TCP duplicate packages rate Nr is greater than the terminal of setting threshold T r;
Total number of terminals in the problem number of terminals/current sampling period in the current sampling period of currency Pc=of problem terminal accounting;
Total number of terminals in problem number of terminals/all history samples cycles in all history samples cycles of historical fiducial value Pb=of problem terminal accounting.
As a preferred embodiment of the present invention, in step S5, if Pc is >=Tp, judge that this network node exists performance fault, wherein Tp is the threshold value of problem terminal accounting under fault network node;
If Pc >=R*Pb and Pc < Tp, judge that the downstream node of this network node exists performance fault, wherein R is network performance deterioration factor;
If Pc < is R*Pb, judge this network node normal operation.
Beneficial effect of the present invention is: the Sampling network performance issue that the present invention proposes is also located the method for malfunctioning node, monitor all terminal access business platform data flow at the business platform outbound of IP metropolitan area network core layer, by adding up the TCP duplicate packages rate of each terminal, evaluate and test out each terminal traffic quality and be subject to Network Packet Loss effect; According to the attached relation of IP address of terminal and each network node, calculate the ratio of each network node subordinate problem terminal, and then can find out quickly and accurately the fault network node that causes terminal traffic Quality Down.
Brief description of the drawings
Fig. 1 is the schematic diagram that has carried out loss recovery by TCP retransmission mechanism.
Fig. 2 is the schematic diagram of certain network failure case.
Fig. 3 is Sampling network performance issue of the present invention the flow chart of locating malfunctioning node method.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
Embodiment mono-
Refer to Fig. 3, the present invention has disclosed Sampling network performance issue and has located the method for malfunctioning node, and described method comprises the steps:
[step S1] sets up IP metropolitan area network topological structure, comprises hierarchical relationship between network node and each network node and the corresponding relation in IP address of terminal pond under it.
[step S2] catches the IP packet of all terminal access business platforms in the business platform outlet of IP metropolitan area network core layer by collecting device.
[step S3] flows to line trace to the tcp data of each terminal, adds up TCP bag sum (A) and the TCP duplicate packages number (B) of each terminal, and calculates TCP duplicate packages rate Nr=B/A, then records the corresponding relation of each IP address of terminal with Nr.
TCP duplicate packages statistical rules: in certain hour section, if there is the TCP bag of two or more same sequence number in same TCP stream, the coated statistics of the TCP occurring is below TCP duplicate packages.
[step S4] calculates currency (Pc) and the historical fiducial value (Pb) of the affiliated problem terminal accounting of each network node.
So-called problem terminal refers to that its TCP duplicate packages rate (Nr) is greater than the terminal of setting threshold value (Tr), and the default value of Tr is 10%;
Currency (Pc)=(the problem number of terminals in current sampling period)/(total number of terminals in current sampling period) of problem terminal accounting;
Historical fiducial value (Pb)=(the problem number of terminals in all history samples cycles)/(total number of terminals in all history samples cycles) of problem terminal accounting.
[step S5], according to the topological structure of metropolitan area network, whether the current problem terminal accounting (Pc) that from top to down traversal detects each network node exceeds standard:
If Pc is >=Tp, judge that this network node exists performance fault, wherein Tp is the threshold value (as default value can be set as 50%) of problem terminal accounting under fault network node;
If Pc >=R*Pb and Pc < Tp, judge that the downstream node of this network node exists performance fault, wherein R is network performance deterioration factor (as default value can be set as 1.5);
If Pc < is R*Pb, judge this network node normal operation.
[step S6], if network topology traversal finishes, finishes.
Embodiment bis-
In the present embodiment, Sampling network performance issue of the present invention the method for locating malfunctioning node comprise the steps:
Step S1, set up IP metropolitan area network topological structure, comprise hierarchical relationship between network node and each network node and the corresponding relation in IP address of terminal pond under it;
Step S2, the IP packet of all terminal access business platforms is caught in the business platform outlet of IP metropolitan area network core layer by collecting device;
Step S3, the tcp data of each terminal is flow to line trace, the TCP that adds up each terminal wraps total A and TCP duplicate packages is counted B, and calculates TCP duplicate packages rate Nr=B/A, then records the corresponding relation of each IP address of terminal with Nr;
Step S4, calculate currency Pc and the historical fiducial value Pb of problem terminal accounting under each network node;
Step S5, according to the topological structure of metropolitan area network, whether the current problem terminal accounting Pc that from top to down traversal detects each network node exceeds standard;
If step S6 network topology traversal finishes, finish.
In sum, the Sampling network performance issue that the present invention proposes is also located the method for malfunctioning node, monitor all terminal access business platform data flow at the business platform outbound of IP metropolitan area network core layer, by adding up the TCP duplicate packages rate of each terminal, evaluate and test out each terminal traffic quality and be subject to Network Packet Loss effect; According to the attached relation of IP address of terminal and each network node, calculate the ratio of each network node subordinate problem terminal, and then can find out quickly and accurately the fault network node that causes terminal traffic Quality Down.
Here description of the invention and application is illustrative, not wants scope of the present invention to limit in the above-described embodiments.Here the distortion of disclosed embodiment and change is possible, and for those those of ordinary skill in the art, the various parts of the replacement of embodiment and equivalence are known.Those skilled in the art are noted that in the situation that not departing from spirit of the present invention or substantive characteristics, and the present invention can be with other form, structure, layout, ratio, and realize with other assembly, material and parts.In the situation that not departing from the scope of the invention and spirit, can carry out other distortion and change to disclosed embodiment here.
Claims (8)
1. Sampling network performance issue locate the method for malfunctioning node, is characterized in that, described method comprises the steps:
Step S1, set up IP metropolitan area network topological structure, comprise hierarchical relationship between network node and each network node and the corresponding relation in IP address of terminal pond under it;
Step S2, the IP packet of all terminal access business platforms is caught in the business platform outlet of IP metropolitan area network core layer by collecting device;
Step S3, the tcp data of each terminal is flow to line trace, the TCP that adds up each terminal wraps total A and TCP duplicate packages is counted B, and calculates TCP duplicate packages rate Nr=B/A, then records the corresponding relation of each IP address of terminal with Nr;
TCP duplicate packages statistical rules: in certain hour section, if there is the TCP bag of two or more same sequence number in same TCP stream, the coated statistics of the TCP occurring is below TCP duplicate packages;
Step S4, calculate currency Pc and the historical fiducial value Pb of problem terminal accounting under each network node;
Described problem terminal refers to that its TCP duplicate packages rate Nr is greater than the terminal of setting threshold T r;
Total number of terminals in the problem number of terminals/current sampling period in the current sampling period of currency Pc=of problem terminal accounting;
Total number of terminals in problem number of terminals/all history samples cycles in all history samples cycles of historical fiducial value Pb=of problem terminal accounting;
Step S5, according to the topological structure of metropolitan area network, whether the current problem terminal accounting Pc that from top to down traversal detects each network node exceeds standard:
If Pc is >=Tp, judge that this network node exists performance fault, wherein Tp is the threshold value of problem terminal accounting under fault network node;
If Pc >=R*Pb and Pc < Tp, judge that the downstream node of this network node exists performance fault, wherein R is network performance deterioration factor;
If Pc < is R*Pb, judge this network node normal operation;
If step S6 network topology traversal finishes, finish.
2. Sampling network performance issue according to claim 1 locate the method for malfunctioning node, is characterized in that:
In step S4, the default value of Tr is 10%.
3. Sampling network performance issue according to claim 1 locate the method for malfunctioning node, is characterized in that:
In step S5, the default value of threshold T p is 50%.
4. Sampling network performance issue according to claim 1 locate the method for malfunctioning node, is characterized in that:
In step S5, the default value of network performance deterioration factor R is 1.5.
5. Sampling network performance issue locate the method for malfunctioning node, is characterized in that, described method comprises the steps:
Step S1, set up IP metropolitan area network topological structure, comprise hierarchical relationship between network node and each network node and the corresponding relation in IP address of terminal pond under it;
Step S2, the IP packet of all terminal access business platforms is caught in the business platform outlet of IP metropolitan area network core layer by collecting device;
Step S3, the tcp data of each terminal is flow to line trace, the TCP that adds up each terminal wraps total A and TCP duplicate packages is counted B, and calculates TCP duplicate packages rate Nr=B/A, then records the corresponding relation of each IP address of terminal with Nr;
Step S4, calculate currency Pc and the historical fiducial value Pb of problem terminal accounting under each network node;
Step S5, according to the topological structure of metropolitan area network, whether the current problem terminal accounting Pc that from top to down traversal detects each network node exceeds standard;
If step S6 network topology traversal finishes, finish.
6. Sampling network performance issue according to claim 5 locate the method for malfunctioning node, is characterized in that:
In step S3, TCP duplicate packages statistical rules is: in certain hour section, if there is the TCP bag of two or more same sequence number in same TCP stream, the coated statistics of the TCP occurring is below TCP duplicate packages.
7. Sampling network performance issue according to claim 5 locate the method for malfunctioning node, is characterized in that:
In step S4, described problem terminal refers to that its TCP duplicate packages rate Nr is greater than the terminal of setting threshold T r;
Total number of terminals in the problem number of terminals/current sampling period in the current sampling period of currency Pc=of problem terminal accounting;
Total number of terminals in problem number of terminals/all history samples cycles in all history samples cycles of historical fiducial value Pb=of problem terminal accounting.
8. Sampling network performance issue according to claim 5 locate the method for malfunctioning node, is characterized in that:
In step S5, if Pc is >=Tp, judge that this network node exists performance fault, wherein Tp is the threshold value of problem terminal accounting under fault network node;
If Pc >=R*Pb and Pc < Tp, judge that the downstream node of this network node exists performance fault, wherein R is network performance deterioration factor;
If Pc < is R*Pb, judge this network node normal operation.
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