Common Cisco switch port monitoring configurations

1. Catalyst 2900XL/3500XL/2950 series switch port monitoring configuration
Run the following command to configure a port listener:
Port monitor
For example, F0/1 and F0/2 belong to the same VLAN1 and F0/1 Listen to ports F0/2 and F0/2:
Interface FastEthernet0/1
Port monitor FastEthernet0/2
Port monitor FastEthernet0/5
Port monitor VLAN1
2. Configure port listening for Catalyst 6000, and series switches
Run the following command to configure a port listener:
Set span
For example, in Module 6, Port 1 and Port 2 belong to the same VLAN1, Port 3 in VLAN2, port 4 and 5 in VLAN2, and Port 2 listen to ports 1, 3, 4, and 5,
Set span 6/1, 6/3-5 6/2
Run the following command to disable port listening:
Set span disable [dest_mod/dest_port | all]