A comparison of application-level and router-assisted hierarchical schemes for reliable multicast
A comparison of application-level and router-assisted hierarchical schemes for reliable multicast
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应用层和路由器辅助的可靠组播分层方案的比较
DOI：
10.1109/tnet.2004.828950
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
D. Estrin
中科院分区：
文献类型：
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作者：
Pavlin Radoslavov;C. Papadopoulos;R. Govindan;D. Estrin
在可靠多播中实现可伸缩性的一种方法是使用层次结构。层次结构可以在应用层建立，也可以使用路由器辅助。通过路由器辅助，我们可以对错误恢复功能的放置进行更细粒度的控制，因此，由路由器辅助产生的层次结构预计将具有更好的性能。在本文中，我们测试这一假设比较两个计划，一个使用应用程序级层次结构（ALH）和另一个使用路由器辅助层次结构（RAH）。与我们的预期相反，我们发现ALH的定性性能与RAH相当。我们不建模的开销创建的层次结构，也没有增加路由器辅助网络的成本。因此，我们的结论为哪种方法更好的辩论提供了信息，而不是结束辩论。
One approach to achieving scalability in reliable multicast is to use a hierarchy. A hierarchy can be established at the application level, or by using router-assist. With router-assist we have more fine-grain control over the placement of error-recovery functionality, therefore, a hierarchy produced by assistance from the routers is expected to have better performance. In this paper, we test this hypothesis by comparing two schemes, one that uses an application-level hierarchy (ALH) and another that uses router-assisted hierarchy (RAH). Contrary to our expectations, we find that the qualitative performance of ALH is comparable to RAH. We do not model the overhead of creating the hierarchy nor the cost of adding router-assist to the network. Therefore, our conclusions inform rather than close the debate of which approach is better.