We are looking to set up site to site netflow monitoring in NTA for nearly 40 sites in our environment.
How do we proceed.
You will need to refer to the admin guide to get the 'how to' details but basically you ensure the nodes are in Orion then each node needs to be set up to send the flows to Orion. Cisco NetFlow Configuration
Just to add to this, following your population of flows, you will want to categorise each site into an 'IP Group', allowing you to then filter and view traffic between particular sites:
IP address groups in SolarWinds NTA