Abstract
The ability to trace multicast paths is currently available on the Internet by means of Internet Group Management Protocol MTRACE packets. We introduce Tracer, a protocol that organizes the receivers of a multicast group deterministically into a logical tree structure while maintaining exact packet-loss correlation for local error recovery, and without requiring any changes to existing multicast routing protocols. Tracer uses MTRACE packets in the Internet Group Management Protocol to allow a receiver host to obtain its path to the source of a multicast group. Receivers use the multicast path information to determine how to achieve local error recovery and effective congestion control. We compare the tracing approach with prior mechanisms that attempt local recovery. Results of measurements carried out over the Collaborative Advanced Internet Research Network illustrate the fact that tracing multicast paths is an effective tool to organize receivers based on their packet-loss correlation.
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