Novel large scale research projects often require cooperation between variousdifferent project partners that are spread among the entire world. They do notonly need huge computing resources, but also a reliable network to operate on.The Large Hadron Collider (LHC) at CERN is a representative example for such aproject. Its experiments result in a vast amount of data, which is interestingfor researchers around the world. For transporting the data from CERN to 11data processing and storage sites, an optical private network (OPN) has beenconstructed. As the experiment data is highly valuable, LHC defines very highrequirements to the underlying network infrastructure. In order to fulfil thoserequirements, the connections have to be managed and monitored permanently. Inthis paper, we present the integrated monitoring solution developed for theLHCOPN. We first outline the requirements and show how they are met on thesingle network layers. After that, we describe, how those single measurementscan be combined into an integrated view. We cover design concepts as well astool implementation highlights.
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