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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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Telemetry Application in a Microburst Traffic Detection Scenario

Telemetry Application in a Microburst Traffic Detection Scenario

Traffic microbursts exist during network transmission. If a traffic microburst occurs, packets that exceed the device forwarding capacity are discarded. Devices then retransmit these packets, affecting the communication quality. The larger the number of microbursts, the poorer the network communication quality. Therefore, the NMS needs to monitor microbursts and adjust traffic in time.

Network traffic is generally measured based on the average traffic in 5 minutes and seems to be stable. However, at lower granularity levels, for example, millisecond level, many microbursts occur and cannot be perceived by SNMP get operations.

As shown in Figure 17-6, the traffic trend based on statistics queried in SNMP get mode is stable, and no network exception occurs. However, the traffic statistics reported in Telemetry mode show that microbursts occur. These microbursts can be detected using high-precision Telemetry sampling.

Figure 17-6 Diagram of Telemetry microburst traffic detection

The CE series switch that functions as the Telemetry device supports micro-burst monitoring. The implementation is as follows:
  1. When Telemetry sampling and subscription based on micro-burst monitoring are created successfully, the switch reads the buffer usage of an interface queue based on the sampling interval.

  2. When either of the following conditions is met, the switch considers that a micro-burst occurs and records micro-burst information, including the micro-burst occurrence time and corresponding queue buffer usage:
    • The read queue buffer usage is higher than or equal to the configured lower threshold for the buffer usage, and the difference between the read queue buffer usage and the latest recorded queue buffer usage is larger than 2%.
    • The read queue buffer usage is higher than or equal to the configured lower threshold for the buffer usage, and the difference between the micro-burst occurrence time and the latest recorded micro-burst occurrence time exceeds 1s.
  3. When the Telemetry data sending period is reached, the switch sends micro-burst information recorded during the sending period in Telemetry data format to the collector for analysis.

  4. After the collector receives data sent by the switch, it analyzes the data and dynamically adjusts the network based on the analysis result.
For the CE12800 and the CE12800E configured with FD-X series cards, frequently reading buffer information about interface queues affects the CPU of the switch. In this case, the switch adjusts the sampling interval of micro-burst monitoring based on the CPU usage.
  • When the CPU usage is lower than or equal to 60%, the switch reads the buffer usage of interface queues based on the configured sampling interval.
  • When the CPU usage is higher than or equal to 80%, the switch stops reading the buffer usage of interface queues.
  • When the CPU usage is higher than 60% and lower than 80%, the switch reads the buffer usage of interface queues based on the sampling ratio of 10:1. That is, the switch reads the buffer usage of interface queues once every 10 sampling intervals.
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Updated: 2019-04-20

Document ID: EDOC1100075344

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