Performance measurement and monitoring is the starting point for any potential troubleshooting. GEANT, together with ESnet, Internet2, Indiana University and University of Michigan for over a decade provide perfSONAR - a modular open-source suite for active network measurements, that helps network engineers around the world in managing and controlling the performance of their networks. Performance Measurement Platform is created in and for GEANT community and enables collaboration between all participants. Help and support to the community in integrating network monitoring tools and growing network monitoring platform is provided through Multi-Domain Monitoring Consultancy and Expertise service.