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Packet capture commands
To use packet capture, you must install the packet capture feature image by using the boot-loader
or install command. For more information, see software upgrade or ISSU in Fundamentals
Configuration Guide.
packet-capture interface
Use packet-capture interface to capture incoming packets on an interface.
Syntax
Save captured packets to a file:
packet-capture interface interface-type interface-number [ capture-filter capt-expression |
limit-captured-frames limit | limit-frame-size bytes | autostop filesize kilobytes | autostop
duration seconds | autostop files numbers | capture-ring-buffer filesize kilobytes |
capture-ring-buffer duration seconds | capture-ring-buffer files numbers ] * write filepath [ raw |
{ brief | verbose } ] *
Display captured packets:
packet-capture interface interface-type interface-number [ capture-filter capt-expression |
display-filter disp-expression | limit-captured-frames limit | limit-frame-size bytes | autostop
duration seconds ] * [ raw | { brief | verbose } ] *
Views
User view
Predefined user roles
network-admin
Parameters
interface-type interface-number: Specifies an Ethernet interface by its type and number.
capture-filter capt-expression: Specifies an expression to match packets to be captured, a
case-sensitive string of 1 to 256 characters. If you do not specify a capture filter expression, the
device captures all incoming packets on an interface.
display-filter disp-expression: Specifies an expression to match packets to be displayed, a
case-sensitive string of 1 to 256 characters. If you do not specify a display filter expression, the
device displays all captured packets.
limit-captured-frames limit: Stops capturing packets when the maximum number of captured
packets is reached. The limit argument sets the maximum number of packets to capture. The value
range is 0 to 2147483647, and the default value is 10. If you set the limit to 0, the maximum number
of captured packets is unlimited.
limit-frame-size bytes: Sets the maximum number of bytes to capture for a packet. The value range
is 64 to 8000 bytes, and the default value is 8000 bytes.
autostop filesize kilobytes: Stops capturing packets if the maximum packet file size is exceeded
when file rotation is disabled. The kilobytes argument sets the maximum packet file size. The value
range is 1 to 65536 kilobytes. If you do not set a limit, the packet file size is unlimited.
autostop duration seconds: Stops capturing packets when the capturing duration expires. The
seconds argument sets the capturing duration. The value range is 1 to 2147483647 seconds. If you
do not set a limit, the capturing duration is unlimited.
autostop files numbers: Stops capturing packets when the maximum number of file rotations is
reached. The numbers argument sets the maximum number of file rotations. The value range is 2 to
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