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8
Port Mirroring
This section describes the Port Mirroring feature, which can serve as a diagnostic tool,
debugging tool, or means of fending off attacks.
Overview
Port mirroring selects network traffic from specific ports for analysis by a network analyzer,
while allowing the same traffic to be switched to its destination. You can configure many
switch ports as source ports and one switch port as a destination port. You can also configure
how traffic is mirrored on a source port. Packets received on the source port, transmitted on a
port, or both received and transmitted, can be mirrored to the destination port.
CLI Examples
The following are examples of the commands used in the Port Mirroring feature.
Example #1: Set up a Port Mirroring Session
The following command sequence enables port mirroring and specifies a source and
destination ports.
(DWS-3024) #config
(DWS-3024) (Config)#monitor session 1 mode
(DWS-3024) (Config)#monitor session 1 source interface 0/7 ?
<cr>
rx
tx
Press Enter to execute the command.
Monitor ingress packets only.
Monitor egress packets only.
(DWS-3024) (Config)#monitor session 1 source interface 0/7
(DWS-3024) (Config)#monitor session 1 destination interface 0/8
(DWS-3024) (Config)#exit
Overview
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