Network traffic monitoring system and monitoring method

Inactive Publication Date: 2001-12-13
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0020] Therefore, according to the network traffic monitoring system, it is capable of reducing data to be gathered, since the data are put together

Problems solved by technology

However, when the conventional traffic monitoring method is operated in accordance with the Diffserv protocol, the method can not capture the transferring priority provided by Diffserv protocol and can not monitor what service is assigned to a network.
Further, since the conventional traffic monitoring method also classifies packets transferred by using end-to-end protocol, the number of IP addresses to be treated is inevitably increased.
In consequence, a memory capacity of traffic monit

Method used

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  • Network traffic monitoring system and monitoring method

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Embodiment Construction

[0028] At first, illustration is made about an embodiment of the invention with reference to FIG. 1.

[0029] In FIG. 1, each of NEs (Network Element) 1 and 2 is an IP router which is a part of an IP network. The NEs 1 and 2 are connected to each other via a link 100 and IP packets are transferred between them. The IP packets are classified based on Diffserv protocol that is proposed by the IETF and that defines each priority level of the IP packets.

[0030] Diffserv protocol classifies IP packets on the basis of quality of transmission. In the protocol, DSCP (Diffserv Code Point) representing a service class is assigned to a field in IP header. In the field, fourteen sorts of DSCP values are practically set and according to this value, the priority level of transmission of the IP packet is determined.

[0031] A traffic monitor unit (probe) 3 monitors IP packets passing through the link 100. Specifically, the illustrated traffic monitor unit 3 captures the packets and classifies the packet...

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Abstract

In a network traffic monitoring system and method for capturing a service distribution to monitor an IP network using Diffserv protocol, each IP packet on the network is monitored by extracting DSCP and IP addresses from a header of the packet. Then, traffic information is accumulated for each service class and for each sub network address, using the extracted information.

Description

BACKGROUND OF THE INVENTION[0001] 1. Field of the Invention[0002] The invention relates to a network traffic monitoring system and a network traffic monitoring method which is used in the system and, in particular, to the traffic monitoring method which is used in a large scale IP (Internet Protocol) network.[0003] 2. Description of the Related Art[0004] In a conventional traffic monitoring method, it is usual that a source IP address and a destination IP address are read from an IP header, and counting operation of packets is performed based on a species of an upper or a host application which is identified from a pair of the source and the destination IP addresses together with a port number defined on the fourth layer of the hierarchical model known in the art. Briefly, traffic is monitored on the basis of counts of the counting operation in the conventional traffic monitoring method.[0005] On the other hand, a new protocol has been proposed by IETF (Internet Engineering Task For...

Claims

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Application Information

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IPC IPC(8): H04L12/24H04L12/26G06F13/00H04L12/28H04L12/70
CPCH04L41/024H04L43/028H04L43/062H04L43/12H04L43/18
Inventor NAGAO, YASUTAKA
Owner NEC CORP
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