I currently have Netflow enabled on all of my routers in my network.
However, I have a Cat3750, which does not support Netflow. The 3750 is at a larger remote site and I need visibility into the traffic that is traversing internal to that switch. All VLANs are configured on the 3750. I have an extra Cisco router, which I have theorized I could use as a Netflow probe.
Here is the idea, please excuse the crudeness of the diagram.
The 2811 Router has to FastEthernet ports.
F0/0 would be configured with no IP Address and would be connected to the 3750 on G0/1 with no VLANs configured.
F0/1 would be configured with a static IP and connected to the 3750 on port G/02 with the appropriate VLAN to ensure network connectivity.
On the 3750, configure a monitor session with a destination of Interface G0/1.
On the 2811, configure netflow to sent to the Netflow server and set F0/0 for ip flow ingress.
Obviously, it doesn't work. But I cannot figure out why.