If you do not require in-depth traffic analysis, but only simple network performance monitoring, you can use NAM Probes as flow collectors without using any NAM Probes as probes.
Using NAM Probe flow collectors for simple network performance monitoring in a distributed network
To enable capture of application traffic between remote locations, enable NetFlow on the routers at these locations and use a NAM Probe flow collector to receive and decode the NetFlow records.
The following figure illustrates how a NAM Probe flow collector can be used to gain complete coverage on a large distributed network.
Using NAM Probe flow collectors for simple network performance monitoring within a single data center
Collect flows from all the NetFlow-enabled devices in a single data center.
Indiscriminate monitoring of all interfaces on hot/core devices can generate very large numbers of flows and create significant CPU load on these devices. In such cases, CPU load monitoring is particularly important and port pairing may be needed to reduce the load and avoid duplication.
The following figure illustrates how a NAM Probe can be used as a flow collector to monitor a large data center.
As noted above, if such a scenario is used and core devices are equipped with more than two interfaces, particular care must be taken to avoid generating huge numbers of flows (thus causing duplication and heavy CPU load on the devices).