I know that Netflow isn't supported on the 3750 series switches but we have a requirement to monitor the the source-destination pairings, protocols etc on 2 seperate stacks of 3750s. All of the stats need to be collected back at a centralized server. Basically we need NetFlow capabilities :o(
Can someone give me some advice or guidance on how they have achieved this monitoring themselves on similar switches and what tools they have used.
I have looked at RSPAN but think that this would load the trunk link between the switches too much and affect the proper traffic.(The stacks are in separate buildings).
I thought about plugging a probe in to each switch stack and use SPAN to monitor the same vlan on either switch stack. Problem here is that the probes are independant and I will get duplicate statistics being collected for any traffic flows that traverse the two stacks.
So the problems are:
1. I can't monitor them as a single unit
2. I can't use netflow
3. RSPAN will/may affect the traffic on the trunks
4. Dual probes = some dual stats
PRTG is fantastic for monitoring individual interfaces for inbound & outbound bandwidth but it doesn't give me the all important breakdown of the traffic.
Any advice greatly appreciated.