The Pacific Rim Application and Grid Middleware Assembly (PRAGMA) is an international community of researchers that actively collaborate to address problems and challenges of common interest in eScience. The PRAGMA Experimental Network Testbed (PRAGMA-ENT) was established with the goal of constructing an international software-defined network (SDN) testbed to offer the necessary networking support to the PRAGMA cyberinfrastructure. PRAGMA-ENT is isolated, and PRAGMA researchers have complete freedom to access network resources to develop, experiment, and evaluate new ideas without the concerns of interfering with production networks. In the first phase, PRAGMA-ENT focused on establishing an international L2 backbone.

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The deployment of an automatic network performance measurement system is crucial to the early detection and analysis of network quality degradations and failures. Once the overall network health status can be summarized and visualized in an easily accessible graphic user interface, the difficulty of network maintenance and troubleshooting can be significantly reduced. This study provided a detailed introduction to how the perfSONAR is implemented in TWAREN backbone and how the individual data are integrated and eventually visualized as a handy weathermap for network operators to use.