15
PORT MIRRORING COMMANDS
The port mirroring commands in the Command Line Interface (CLI) are listed (along with the appropriate parameters) in the
following table.
Command Parameters
config m
irror
port
<port> {[a
dd |delet
e] sourc
e ports <por
tlist> [
rx|tx
|both]}
enable mirror
disable mirror
show mirror
Each command is listed, in detail, in the following sections.
config mirror port
Purpose
Used to configure a mirror port − source port pair on the Switch. Traffic from any source
port to a target port can be mirrored for real-time analysis. A logic analyzer or an RMON
probe can then be attached to study the traffic crossing the source port in a completely
obtrusive manner.
Syntax
config mir
ror port <port> {[a
dd |delete] source
ports <portlist>
[rx|tx|both]}
Description This command allows a range of ports to have all of their traffic also sent to a designated
port, where a network sniffer or other device can monitor the network traffic. In addition,
users can specify that only traffic received by or sent by one or both is mirrored to the
Target port.
Parameters
<port> − This specifies the Target port (the port where mirrored packets will be received).
The target port must be configured in the same VLAN and must be operating at the same
speed as the source port.
[add | delete] – Specifies if the user wishes to add or delete ports to be mirrored that are
specified in the source ports parameter.
source ports – The port or ports being mirrored. This cannot include the Target port.
<portlist> − This specifies a port or range of ports that will be mirrored. That is, the range
of ports in which all traffic will be copied and sent to the Target port.
rx − Allows the mirroring of only packets received by (flowing into) the port or ports in the
port list.
tx − Allows the mirroring of only packets sent to (flowing out of) the port or ports in the port
list.
both − Mirrors all the packets received or sent by the port or ports in the port list.
Restrictions The Target port cannot be listed as a source port. Only Administrator-level users can
issue this command.
Example usage:
To add the mirroring ports:
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