Monitoring reachability in the global multicast infrastructure (2000) [11 citations — 6 self]
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@INPROCEEDINGS{Sarac00monitoringreachability,author = {Kamil Sarac and Kevin C. Almeroth},
title = {Monitoring reachability in the global multicast infrastructure},
booktitle = {in International Conference on Network Protocols (ICNP},
year = {2000},
pages = {141--150}
}
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Abstract:
The multicast infrastructure has transitioned to a topology that now supports hierarchical routing. Instead of a flat virtual topology originally called the Multicast Backbone (MBone) there now exists a hierarchy where routing information is exchanged between autonomous systems (ASes). A version of the Border Gateway Protocol (BGP) that supports multicast is being used. In the original MBone, reachability was almost always all-or-nothing. It was relatively uncommon to have routing problems that would affect reachability to only part of the MBone. However, in today's multicast infrastructure reachability problems are much more common. Now that the structure of the multicast infrastructure models that of unicast, the possibility of limited connectivity to other domains is much more likely. However, unlike unicast, there are no suitable tools for monitoring reachability between multicast domains. In this paper, we present a system called sdr-monitor. This tool collects session directory information from numerous places around the world and presents an application-layer view of reachability. Using data collected over the last year, we have performed analysis on an archival data set and present long term reachability characteristics of the global multicast infrastructure. Our findings are that overall reachability is generally quite poor. However, having identified some of the reasons, we believe there is not a fundamental infrastructure problem, but protocol bugs and a lack of tools to alert network managers when there are problems.
