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One of the main challenges of deploying multicast services in the Internet is the lack of active monitoring tools that can detect and isolate multicast reachability problems in real-time. Existing multicast monitoring tools are either not scalable or use proprietary protocols which limit their deployment in enterprise networks. This paper presents SNMP-based multicast reachability monitoring (SMRM), a framework for monitoring the health and the quality of multicast delivery paths (or forwarding tree) in real-time. SMRM addresses these limitations by using SNMP as a core component, which significantly facilitates the wide deployment of SMRM in existing networks. The SMRM framework combines distributed monitoring and centralized control, which offers a scalable, easy-to-use and easy-to-deploy multicast monitoring service.