Kentik (<a href="http:&#x2F;&#x2F;www.kentik.com" rel="nofollow">http:&#x2F;&#x2F;www.kentik.com</a>) is doing something very similar, as a cloud-based service or on-prem cluster.  Accepts standard flow formats (netflow, sflow, IPFIX) from routers and switches, and also &quot;augmented&quot; flow from nprobe running on hosts or sensors.