There is a whole plethora of resources for helping diagnosis multicast problems. Some of the most useful are linked off the main Abilene multicast page. Some of the links there plus others include:
The Multicast Debugging Handbook
In addition, there is a good tutorial style paper available:
"Supporting Multicast Deployment Efforts: A Survey of Tools for Multicast Monitoring", Journal of High Speed Networking--Special Issue on Management of Multimedia Networking, March 2001.
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