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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 Packet Trace

Overview of Packet Trace

Purpose

On an enterprise network, packet loss is a problem that usually happens. Huawei switches provide the packet trace function to help you find out the cause of packet loss inside the switches. Then you can provide the cause to technical support personnel for fault location. Besides, packet trace can show you the packet forwarding entries in the switches and the hash calculation results for path selection.

Packet trace can locate the packet drop reason. However, if packet drop is caused by congestion, packet trace may not accurately locate the reason because congestion is unexpected and occurs randomly.

Implementation

The switch constructs a detection packet based on the pre-defined profile and sends the packet to a specified interface. During the forwarding of this packet, the switch records the matching forwarding entries, packet drop reason, and hash calculation result for patch selection. When the packet trace process is complete, the switch discards the detection packet.

There are two methods to configure a packet trace profile:
  • Specify the packet content.
  • Specify the packet fields (only for TCP, UDP, and ICMP packets). The key fields of a TCP or UDP packet trace profile include source MAC address, destination MAC address, source IP address, destination IP address, source port number, and destination port number. The key fields of an ICMP packet trace profile include source MAC address, destination MAC address, source IP address, destination IP address, ICMP type, and ICMP code.
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Updated: 2019-04-20

Document ID: EDOC1100075344

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