1. A Survey and Comparison of Overlay Multicast Ching-Feng Li

2. Introduction  Different applications have different characteristics which may have influence on the design choice of overlay multicast techniques  Survey several existing overlay multicast techniques and give a brief comparison of them

3. Comparison of different overlay multicast techniques

4. Example applications and their characteristics

5. Factors that affect choice of multicast technique  Scalability  Fault tolerance  Performance  Quality of service  Security

6. Choice of overlay multicast tree in development phase  Mobile agents can be easily deployed to implement different algorithms of overlay multicast tree construction and maintenance  Purpose: to compare the performance of different algorithms

7. Adaptive reconfiguration of multicast tree (1/2)  Adaptive reconfiguration of host-based multicast tree  Mobile agent can migrate adaptively according to the load of resident host  After mobile agent migrates, the configuration of multicast tree won’t change at once  After mobile agent migrates, it reconfigures the multicast tree at the new resident host if necessary  If the configuration of multicast tree changes, mobile agent will notify the old resident host

8. Adaptive reconfiguration of multicast tree (2/2)  Adaptive reconfiguration of agent-based multicast tree  Mobile agent can migrate adaptively according to the load of resident host  After mobile agent migrates, the configuration of multicast tree will change at once  After mobile agent migrates, it acts as a data transmission proxy for the old resident host at the new resident host

9. Issues  How many agents will be used?  How to distribute the agents to the host?  How to handle agent migration for reconfiguration of multicast tree?