I have a Dell PE 2650 server which has two Intel Pro/1000 NICs which are teamed, so 1 IP between the two. They plug into my 4507, where each port is in a different channel-group. Each channel-group has a second member port, which is connected to a disabled NIC on the PE (and so in Not-connect state on the Cisco).
My understanding of channel-groups is that they allow two connections to the same physical server by creating a virtual interface - this prevents the spanning-tree protocol from seeing them as a potential loop and blocking one. I was expecting to see the two active ports on the PE in the same channel-group, or, failing that, to only have traffic on one, with the other blocked by the spanning-tree protocol. But both ports show both inbound and outbound traffic?
Any explanation for a tired brain?