Hy,
I would like to use the cisco switch such as a hub.
I had already configutation the next lines:
monitor session 1 source interface gigabitEthernet 0/3 tx
monitor session 1 destination interface gigabitEthernet 0/17
Before I login to server (it is gigabitEthernet 0/17) and I ran tcp dump.
I had to delete ‘monitor session 1 destination interface gigabitEthernet 0/17′ because the server was very slow.
Thank you for the help to everybody.