Catalyst Switched Port
Analyzer (SPAN) Configuration
Here I'm try to give some instructions for configuration of Port
Mirroring on Cisco Catalyst Switches.
In my case I'm try to monitor,
port 5 (Fe 0/5) – This is the port that I want to
mirror
Port 3 (Fe 0/3) - This is the Source port. I'm going to use
Wireshark on this port
Now need to execute following command on the switch:
01.
Enter configuration mode:
SW1# configure terminal
02.
Create
monitoring session and configure interface Fast Ethernet 0/3 as source port for
that session:
SW1(config)# monitor session 1 source interface fastethernet
0/3 both
03.
Configure interface Fast Ethernet 0/5 as
destination port for session 1.
SW1(config)# monitor session 1 destination interface
fastethernet 0/5
04.
Then check, if everything is configured
correctly:
SW1# show monitor session 1
Then connect a PC(with Wireshark
installed) to Port 3 and monitor your PC interface card.
I have found some good CISCO site
about SPAN,
And if you need some help on
Wireshark use this site,
