Summary:
This paper introduces SRM (Scalable Reliable Multicast) which is a scalable frame work supporting reliable delivery of application level frames to multicast groups. SRM only supports reliability in its simplest form which is guaranteeing delivery leaving more complex features such as in order delivery to application and higher layers.
In order to design an scalable reliable delivery mechanism for multicast, authors question some of the fundamental features of typical unicast protocols such as TCP and make a different choice. For example a receiver-based approach to delivery support scales and performs much better than sender-based approaches. Furthermore, naming application level data units rather than state indicators will better fit a dynamic join and separations of the group members.
SRM is mainly a scalable request/repair mechanism within a multicast group. The receivers which believe have missed an ADU request a repair in which is hopefully handled in a recursive fashion from a node close to the congested/broken link rather than the source itself. Much of the analysis is done in tuning the random waits before issuing a request or send out a repair. A main feature of SRM is nodes suppression of each others requests which makes the scheme scalable. Authors analyze and propose dynamic adaptation of the random wait parameters in order to optimize the number of redundant request/repair packets for varying topologies.
Critique:
I think this is an interesting paper to be kept in the syllabus, which definitely helps the reader to get familiar with the complexities scalable multicast support would need in a network. The simulations demonstrated good performance with varying network topologies but the increased variance of the delay sounded like an alarming hint. It can be interesting if we discuss the potential problems an upper level more complex TCP-like protocol might face when it is being run over SRM due to these characteristics. Can a multi-cast ever compete in these features with unicast protocols?
This paper introduces SRM (Scalable Reliable Multicast) which is a scalable frame work supporting reliable delivery of application level frames to multicast groups. SRM only supports reliability in its simplest form which is guaranteeing delivery leaving more complex features such as in order delivery to application and higher layers.
In order to design an scalable reliable delivery mechanism for multicast, authors question some of the fundamental features of typical unicast protocols such as TCP and make a different choice. For example a receiver-based approach to delivery support scales and performs much better than sender-based approaches. Furthermore, naming application level data units rather than state indicators will better fit a dynamic join and separations of the group members.
SRM is mainly a scalable request/repair mechanism within a multicast group. The receivers which believe have missed an ADU request a repair in which is hopefully handled in a recursive fashion from a node close to the congested/broken link rather than the source itself. Much of the analysis is done in tuning the random waits before issuing a request or send out a repair. A main feature of SRM is nodes suppression of each others requests which makes the scheme scalable. Authors analyze and propose dynamic adaptation of the random wait parameters in order to optimize the number of redundant request/repair packets for varying topologies.
Critique:
I think this is an interesting paper to be kept in the syllabus, which definitely helps the reader to get familiar with the complexities scalable multicast support would need in a network. The simulations demonstrated good performance with varying network topologies but the increased variance of the delay sounded like an alarming hint. It can be interesting if we discuss the potential problems an upper level more complex TCP-like protocol might face when it is being run over SRM due to these characteristics. Can a multi-cast ever compete in these features with unicast protocols?
The whiteboard application was the motivation for SRM, and it worked very well indeed, demonstrating the viability of the protocol. As far as I know, SRM hasn't gone anyway since then, although app level multicast (screen sharing apps, shared presentations, even to some extent shared Google docs) demonstrate that there is value in application level approaches.
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