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Configuration Guide - Network Management and Monitoring

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of Network Management and Monitoring, including SNMP, RMON, LLDP, NQA, Service Diagnosis, Mirroring, Packet Capture, sFlow, and NETCONF.
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Overview of NetStream

Overview of NetStream

Definition

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

Purpose

Rapid technological development creates a need for the Internet to carry increasing quantities of services and applications, making the deployment and maintenance of services on the network complex. A new traffic statistics collection technology is required to collect and analyze traffic statistics, enabling precise and optimized network management.

As shown in Table 13-1, traditional traffic statistics collection technologies are inflexible and limited, so they cannot meet current service requirements. NetStream, a technology for precise traffic monitoring and analysis, solves this problem.

Table 13-1 Implementation and limitations of the traditional traffic statistics methods

Traffic Statistics Method

Implementation

Limitation

Statistics based on IP packets

Counts the number of bytes and packets that pass through a device by saving counter indexes in the routing table on the device.

This method applies to the collection of statistics about simple and unvaried 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 do not match any 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 raises costs because 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). This data includes the number of packets, number of bytes, IP addresses, time, types of service (ToSs), and application types. An enterprise can use the data to calculate the expenses of each department and distribute operation costs, effectively managing 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 to analyze the 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 use this information to easily plan and allocate network resources.

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Updated: 2019-04-20

Document ID: EDOC1100075344

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