Generation and exchange of network measurements is critical for all networked environments, and in particular advanced environments like the Grid. The schemata for network metrics that have been defined in the OGF’s Network Measurement Working Group (NM-WG) have spawned a vibrant community among R&E network operators who have been developing and deploying an infrastructure called perfSONAR. The perfSONAR effort began in September 2004 in a series of meetings in and around GGF-12 in Brussels, Belgium. The perfSONAR consortium has begun to produce a series of protocol documents describing the messaging functionality in that system and the NMC group will house the formalization of those standards within the OGF.