When monitoring NetFlow, or sFlow depending on hardware, is it advisable to monitor on each device or the last device in line? For example, in a remote site, a PowerConnect switch (sFlow) connects to a Cisco router (NetFlow) before going to the data center. Should the switch monitor the traffic on each interface? Should the router monitor the traffic? Both? I'm curious as to whether the amount of monitoring will hamper traffic flow?
Thanks,
Dave