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Switching Configuration 49
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.
console#configure
console(config)#monitor session 1 mode
console(config)#monitor session 1 source interface 1/g7 ?
rx Monitor ingress packets only.
tx Monitor egress packets only.
<cr> Press enter to execute the command.
console(config)#monitor session 1 source interface 1/g7
console(config)#monitor session 1 destination interface 1/g10
console(config)#exit
Example #2: Show the Port Mirroring Session
console#show monitor session 1
Session ID Admin Mode Probe Port Mirrored Port Type
---------- ---------- ---------- ------------- -----
1 Enable 1/g10 1/g7 Rx,Tx