Configure port mirror on a Catalyst 2950
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excerpt from the [Cisco Website]
C2950#configure terminal C2950(config)# C2950(config)#monitor session 1 source interface fastethernet 0/2 !--- This configures interface Fast Ethernet 0/2 as source port. C2950(config)#monitor session 1 destination interface fastethernet 0/3 !--- This configures interface Fast Ethernet 0/3 as destination port. C2950(config)# C2950#show monitor session 1 Session 1 --------- Source Ports: RX Only: None TX Only: None Both: Fa0/2 Destination Ports: Fa0/3 C2950#