In hopes to monitor all packet activity on a Catalyst 3750 switch, I have created a SPAN where I have been attempting to use the destination port for packet sniffing. The issue is that I can only see broadcasts as well as inbound/outbound activity from the NIC on the system I have been using. The SPAN was setup as follows:
monitor session 1 source vlan 1 both
montior session 1 destiantion interface Gi1/0/11
Note that this network consists of one vlan, vlan 1. I have also tried the following setup with the same result as the first:
monitor session 1 source interface Gi1/0/1 - 10 both
monitor session 1 source interface Gi1/0/12 - 24 both
monitor session 1 destination interface Gi1/0/11
Am I missing a step? Any relevant infromation would be appreciated. Thanks.