Method for detecting network performance problems and positioning failure nodes
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A network performance and network node technology, applied in the direction of data exchange network, digital transmission system, electrical components, etc., can solve the problems of TCP retransmission increase, IP packet loss, terminal TCP repeated packet rate increase, etc.
Inactive Publication Date: 2014-12-10
DEKSCOM TECH
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When a certain network node in the transmission path between the terminal and the service platform fails, it often causes IP packet loss; since the TCP retransmission mechanism will recover the lost packet, the terminal affected by the faulty node accesses the service platform TCP retransmissions will increase, and correspondingly, the TCP repetition rate of affected terminals will also increase significantly at the exit monitoring point of the service platform.
[0011] exist figure 2 In the fault case shown, the DSLAM-111 is faulty, causing IP packet loss and TCP retransmission to increase when the terminal connected to it accesses the service platform
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Embodiment 1
[0051] see image 3 , the invention discloses a method for detecting network performance problems and locating faulty nodes, said method comprising the steps of:
[0052] [Step S1] Establish the topology structure of the IP MAN, including the hierarchical relationship between network nodes and the corresponding relationship between each network node and the terminal IP address pool to which it belongs.
[0053] [Step S2] Capture the IP data packets of all terminals accessing the service platform through the collection device at the exit of the service platform at the core layer of the IP MAN.
[0054] [step S3] track the TCP data flow of each terminal, count the total number of TCP packets (A) and the number of TCP repeated packets (B) of each terminal, and calculate the TCP repeated packet rate Nr=B / A, then record each terminal Correspondence between IP addresses and Nr.
[0055] Statistical rules for TCP duplicate packets: within a certain period of time, if two or more TC...
Embodiment 2
[0066] In this embodiment, the method for detecting network performance problems and locating faulty nodes in the present invention includes the following steps:
[0067] Step S1, establishing IP metropolitan area network topology, including the hierarchical relationship between network nodes and the corresponding relationship between each network node and the terminal IP address pool to which it belongs;
[0068] Step S2, capturing the IP data packets of all terminals accessing the service platform at the exit of the service platform of the core layer of the IP metropolitan area network through the collection device;
[0069] Step S3, the TCP data stream of each terminal is tracked, counts the total number of TCP packets A and the number of TCP repeated packets B of each terminal, and calculates the TCP repeated packet rate Nr=B / A, then records the IP address of each terminal with the same number of Nr Correspondence;
[0070] Step S4, calculating the current value Pc and th...
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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 [0001] The invention belongs to the technical field of network performance fault detection, relates to a method for locating network fault nodes, in particular to a method for detecting network performance problems and locating fault nodes. Background technique [0002] Traditional network fault node detection methods mainly include the following three categories: [0003] The first category is to use the network management system based on SNMP protocol to manage and maintain the network topology. This kind of network management system can generally only detect serious network failures (for example: network equipment downtime, port damage, or link interruption), but it is difficult to detect performance problems in network equipment or links (such as serious packet loss rate). ). With the advancement of the integration of the three networks, video streaming services have developed rapidly, and these high-bandwidth services have higher and higher requirement...
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