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Configuration Guide - Network Management and Monitoring

S2720, S5700, and S6720 V200R013C00

This document describes the configurations of Network Management and Monitoring, including SNMP, RMON, RMON2, LLDP, Performance Management, iPCA, NQA, Service Diagnosis, Mirroring, Packet Capture, NetStream, sFlow, TWAMP Light, NETCONF, ECA, Intelligent Video O&M, eMDI, and Network Deception.
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Configuring a Device to Capture Packets Sent to the CPU

Configuring a Device to Capture Packets Sent to the CPU

Context

When a CPU fault occurs, capture packets sent to the CPU for analysis. You can configure ACL rules to match the packets you want to capture.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run capture-packet cpu [ vlan vlan-id | acl { ipv4-acl | ipv6 ipv6-acl } ] * destination { file file-name | terminal } * [ time-out time-out-value | packet-num number | packet-len length ] *

    The device is configured to capture packets sent to the CPU.

    NOTE:
    • If the IP addresses of ARP packets on the control plane match the IP addresses in a basic or advanced ACL, these ARP packets can also be captured.
    • Running this command will increase the CPU usage. Therefore, you are not advised to run this command if the CPU usage is higher than the specified value in a Warning message.
    • The packet capture configuration is not saved in the configuration file, and becomes invalid when packet capture is complete.
    • Different packet capture instances cannot be executed simultaneously. That is, a new packet capture instance can be executed only when the previous one is complete.
    • The system limits the rate of captured packets. The default rate limit is 64 kbit/s. If the rate of packets exceeds the limit, some packets may be discarded.

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Updated: 2019-04-20

Document ID: EDOC1100065680

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