Title :
The PGM reliable multicast protocol
Author :
Gemmell, Jim ; Montgomery, Todd ; Speakman, Tony ; Crowcroft, Jon
Author_Institution :
Bay Area Res. Center, Microsoft Res. Media Presence Group, San Francisco, CA, USA
Abstract :
Pragmatic general multicast (PGM) is a reliable multicast transport protocol that runs over a best effort datagram service, such as IP multicast. PGM obtains scalability via hierarchy, forward error correction, NAK elimination, and NAK suppression. It employs a novel polling scheme for NAK delay tuning to facilitate scaling up and down. This article describes the architecture of PGM, and discusses performance and security issues. We show that PGM supports asymmetric networks, achieves high network utilization, and is capable of high-speed (> 100 Mb/s) operation. PGM is currently an IETF experimental RFC that has been implemented in both commercial and academic settings.
Keywords :
delays; forward error correction; multicast protocols; telecommunication security; telecommunication services; transport protocols; IETF RFC; IP multicast; NAK elimination; NAK suppression; asymmetric networks; best effort datagram service; delay tuning; forward error correction; negative acknowledgment; polling scheme; pragmatic general multicast protocol; security issues; transport protocol; Bandwidth; Data security; Delay; Forward error correction; Multicast protocols; Propagation losses; Scalability; Transport protocols; Unicast;
Journal_Title :
Network, IEEE
DOI :
10.1109/MNET.2003.1174173
