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Summary of Packet Capture Modes

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In normal projects, there are many requirements for packet capture. The following describes several common packet capturing methods, which can be flexibly selected based on specific projects.

1. Traffic mirroring


S Switch

observe-port 1 interface gigabitethernet 0/0/2    //Configure observing ports, Multiple observation ports can be configured.


interface gigabitethernet 0/0/1

port-mirroring to observe-port 1 both    //Configure mirrored ports, copy packets to the observing port.


CE switch/AR router


observe-port interface gigabitethernet 1/0/2    // Configure observing ports


interface gigabitethernet 1/0/0

 mirror to observe-port both    // Configure mirrored ports



NE Router

interface gigabitethernet0/1/0

port-observing observe-index 1     // Configure observing ports


interface GigabitEthernet0/3/0      

port-mirroring to observe-index 1

port-mirroring inbound

port-mirroring outbound       // Configure mirrored ports



2. Capture packets through CLI


capture-packet interface gigabitethernet 1/0/0 destination file flash:/capture.cap  (terminal)


After the configuration is complete, the system automatically stops capturing packets when the number of packets reaches 100.

Then use FTP to put the packet capture file to the terminal or server.


3. Using the Fiber-optic splitter or Ethernet Splitter(Tap)

The Fiber-optic splitter or Ethernet Splitter can be used to divide an optical fiber or network cables into two, thus achieving the purpose of copying packets.



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