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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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NetStream Overview

NetStream Overview

Definition

NetStream is a technology that collects statistics on and analyzes service traffic on networks.

Purpose

As technologies fast develop, the Internet needs to carry more services and applications. Service deployment and maintenance on the network become complex. A new traffic statistics collection technology is required to collect and analyze traffic statistics. With this technology, network management is precise and optimized.

Traditional traffic statistics collection technologies are not flexible and have limitations (as shown in Table 14-22), so they cannot meet current service requirements. To solve this problem, NetStream, which is a precise traffic monitoring and analysis technology, is introduced.

Table 14-22 Implementation and limitations of the traditional traffic statistics methods

Traffic Statistics Method

Implementation

Limitation

Statistics based on IP packets

Saves counter indexes in the routing table on a device to count the number of bytes and packets that pass through the device.

This method applies to collection of statistics about simple information instead of various information.

Statistics based on access control lists (ACLs)

Precisely matches flows based on ACLs and then collects statistics.

This method requires large capacity of ACLs and cannot collect statistics about flows that match no ACL rule.

Statistics using SNMP

Uses SNMP to implement simple statistics functions, such as interface statistics, IP packet statistics, and the ACL matching statistics.

The statistics function is not strong enough and collects statistics from the NMS using continuous polling, wasting CPU and network resources.

Statistics based on port mirroring

Duplicates traffic passing through a port and sends the duplicated traffic to a dedicated server for statistics and analysis.

This method requires high costs. In addition, this method occupies an interface. Statistics cannot be collected on an interface that does not support port mirroring.

Statistics based on the traffic duplication at the physical layer

Duplicates traffic using an optical splitter or other devices at the physical layer and then sends the duplicated traffic to a dedicated server for statistics.

This method requires high costs because a dedicated hardware devices must be purchased.

Benefits

  • Accounting

    NetStream provides detailed data for accounting based on resource usage (such as usage of links, bandwidths, and time segments). The data includes the number of packets, number of bytes, IP addresses, time, types of service (ToSs), and application types. An enterprise can calculate expenses of each department and distribute operation costs based on the data to effectively use resources.

  • Network monitoring

    NetStream monitors network traffic almost in real time. NetStream can be deployed on an interface connected to the Internet to monitor outgoing traffic almost in real time and analyze bandwidth usage of services. The traffic monitoring information helps network administrators determine the network running status and discover inappropriate network structures or performance bottlenecks on networks. Enterprises can easily plan and allocate network resources.

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Updated: 2019-08-09

Document ID: EDOC1000041694

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