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S12700 V200R011C10 Configuration Guide - Network Management and Monitoring

This document provides the configurations of network management and monitoring features supported by the product, including SNMP, RMON and RMON2, LLDP, Performance Management, iPCA, NQA, Service Diagnosis, Mirroring, Packet Capture, Traffic Distribution, NetStream, sFlow, and TWAMP Light.
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Configuring a Device to Capture Service Packets

Configuring a Device to Capture Service Packets

Context

If a device fails to forward traffic correctly, configure it to capture service packets for analysis.

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 { interface interface-type interface-number | acl acl-number } * [ vlan vlan-id | cvlan cvlan-id ] * destination { file file-name | terminal } * [ car cir car-value | time-out time-out-value | packet-num number | packet-len length ] *

    The device is configured to capture service packets.

    NOTE:
    • The device can capture only incoming packets and cannot capture outgoing packets.
    • 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.
    • The device cannot capture the packets of fast ICMP reply, BFD, 802.1ag and VBST.
    • If an interface on the X series cards is added to an Eth-trunk, the interface does not support packet capturing.
    • When the device discards the packets that it cannot forward, packets may not be captured in some situations. It is recommended that you obtain packets in other ways, such as mirroring.

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Updated: 2019-10-21

Document ID: EDOC1000178113

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