Abstract
The successful deployment of multicast in the Internet requires the availability of good network management solutions. One of the first management tasks for multicast is to verify its availability in the network. This task is usually referred to as reachability monitoring. Reachability ensures that sources can reach all existing and potential group members. Reachability also implies that receivers have multicast connectivity and can reach all sources. As a result, verifying reachability becomes very important to maintain availability and robustness of the multicast service between sources and receivers. In this paper, we present an application layer mechanism to monitor multicast reachability. First, we justify the need for reachability monitoring systems. Then, we present our monitoring system called sdr-monitor. Sdr-monitor leverages an existing application and provides close to real-time reachability monitoring for the multicast infrastructure. It is the first system that is developed and deployed for monitoring multicast reachability. We present the architecture of the system and then discuss its operation. Finally, we include our evaluations on a data set that we collected using this system. With this analysis, we present long term reachability characteristics of multicast infrastructure during a four year monitoring period between 1999 and 2003 and discuss potential causes for reachability problems.
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