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Configuration Guide - Network Management and Monitoring

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of Network Management and Monitoring, including SNMP, RMON, NETCONF, OpenFlow, LLDP, NQA, Mirroring, Packet Capture, Packet Trace, Path and Connectivity Detection Configuration, NetStream, sFlow, and iPCA.
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Overview of Telemetry

Overview of Telemetry

Definition

Telemetry is a technology developed to fast collect data from physical or virtual devices remotely. Devices use the push mode to proactively send their data information, such as traffic statistics on interfaces, CPU usage, and memory data, to the collector at a specific interval. In the conventional pull mode, devices interact with the collector using questions and answers. The push mode implements real-time and quick data collection.

Purpose

As the SDN network scale increases, more and more services need to be carried, and users have higher requirements on intelligent SDN O&M. Specifically, monitoring data should have a higher precision, so that microburst traffic can be promptly detected and adjusted. The monitoring process should have little impact on device functions and performance to improve device and network utilization.

Conventional network monitoring methods (such as SNMP get and CLI) are of low management efficiency and cannot meet user requirements because of the following disadvantages.

  • The pull mode is used to obtain monitoring data of devices. This mode cannot monitor a large number of network nodes, which limits the network growth.

  • The monitoring data's precision is minute. To improve the precision, you can only query the data more frequently. As a result, the CPU usage of network nodes is high, affecting normal device functions.

  • The data of network nodes monitored is inaccurate due to network transmission delays.

A new network monitoring mode is required to implement large-scale and high-performance monitoring on network devices. The Telemetry technology is therefore developed to meet the requirement. With this technology, the intelligent O&M system can manage more devices, monitoring data can be obtained in real time with high precision, and the monitoring process has little impact on device functions and performance. This technology provides the most important data basis for fast fault locating and network quality optimization. It converts network quality analysis into big data analysis, effectively supporting intelligent O&M.

Table 18-1 shows comparison between Telemetry and conventional network monitoring modes.

Table 18-1 Comparison between Telemetry and conventional network monitoring modes

Telemetry

SNMP Get

SNMP Trap

CLI

Syslog

Working mode

Push

Pull

Push

Pull

Push

Precision

Sub-seconds

Minutes

Seconds

Minutes

Seconds

Whether structured

Structured using the YANG model

Structured using MIB

Structured using MIB

Non-structured

Non-structured

NOTE:

As shown in Table 18-1, although SNMP trap and Syslog use the push mode, only alarms or events are pushed. Monitoring data such as the interface traffic cannot be collected or sent.

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Updated: 2019-04-20

Document ID: EDOC1100075365

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