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Port mirroring on cisco and juniper switches

- Catalyst Cisco 6509 or 3750:

switch#configure terminal
switch(config)#monitor session 1 source interface GigabitEthernet x/x
switch(config)#monitor session 1 destination interface GigabitEthernet x/x

- Catalyst Cisco 3500XL:

switch#configure terminal
switch(config)#interface FastEthernet x/x
switch(config-if)#port monitor FastEthernet x/x

- Firewall Juniper/Netscreen 25

set mirror port source interface1 destination interface2

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