Reliable Multicast Group

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Presentation transcript:

Reliable Multicast Group Neelofer T. CMSC 621 Oct 25, 2007

What is Reliable Multicasting? Reliability could mean messages are delivered: In order In timely manner No duplicates Processes may enter/leave the group Processes may fail while communicating

Reliable Multicasting Issues Protocol TCP is point-to-point Multicast is not connection oriented Protocols based on IP Multicast Applications over UDP Reliable multicasting can cause network congestion: Large amounts of data transmission since multiple recipients Control messages for reliability

Small Scale Group For small scale group: Large scale groups cause: Reliable, connection oriented, point-to-point connections are feasible Messages have sequence numbers Receivers acknowledge messages Request retransmission of missing messages Large scale groups cause: Feedback implosion Congestion due to repair messages

Hierarchical Feedback Control RMTP (reliable multicast transport protocol) Designated receivers act as coordinators for sub-groups Receivers unicast feedback to DR DRs retransmit data to sub-group Hierarchy of DRs reduces load on original sender

http://www.cisco.com/web/about/ac123/ac147/archived_issues/ipj_1-2/reliable_multicast.html

SRM (Scalable Reliable Multicast) Receivers help each other Receiver multicasts retransmission request after a specific time period Closest neighbor with requested data will multicast the message Distant neighbors timeout later than the closest ones If data is not retransmitted by anyone when a node timesout, then it multicasts the data

PGM (Pragmatic General Multicast) Ensures that all receivers can get reliable, ordered, duplicate data or can detect message loss NACK based protocol Suited for applications where messages can join and leave group at any time Uses routers for group control

References Tanenbaum and Steen, “Distributed Systems Principles and Paradigms” Peled and Vardi, “Formal Techniques for Networked and Distributed Systems” http://rmt.motlabs.com/ C. Kenneth Miller, “Reliable Multicast Protocols and Applications” Gemmel et al, “The PGM Reliable Multicast Protocol” RFC 3940, “NACK-Oriented Reliable Multicast Protocol (NORM)”

Wu, “Verification analysis of Reliable Multicast protocol”

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