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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 Discarded Packet Capture

Overview of Discarded Packet Capture

Purpose

When packet loss occurs in the chip of a device, the device only records the number of discarded packets, but not detailed information about the packets. Therefore, the impact on services cannot be evaluated, and network faults are hard to locate and diagnose in a timely manner. To resolve these problems, you can configure the discarded packet capture function. This function enables a device to send the packets discarded in the device chip to the CPU. The device then analyzes the characteristics and count of the discarded packets.

Implementation

After the discarded packet capture function is configured, the device captures the packets discarded during forwarding and congestion, and sends the captured packets to the CPU. The device then analyzes the characteristics of the discarded packets, including the source and destination MAC addresses, VLAN, Ethernet type, source and destination IP addresses, source and destination port numbers, source packet header (80 bytes at most), the time when packets are discarded, and source interface name of the discarded packets. In addition, the device collects the number of discarded packets. For the packets discarded due to congestion, the device also analyzes the queue ID of the packets and the reason why the packets are discarded. You can view all the analysis results on the device, which can also be sent to a collector through a GRPC interface.

For packets discarded during forwarding, the device cannot analyze the queue ID of the packets or the reason why the packets are discarded. Packets will be discarded during forwarding if VLAN check, Layer 2 forwarding entry query, or Layer 3 forwarding entry query fails.

After the discarded packet capture function is enabled, the device sends the captured packets to the CPU. The maximum rate for sending discarded packets to the CPU is 1000 pps. Therefore, this function is applicable to networks with a few packets discarded. If a great number of packets are discarded on a network, this function cannot capture all the discarded packets.

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Updated: 2019-04-20

Document ID: EDOC1100075344

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